Electrical Engineering Questions and Answers for competitive exams PDF
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As electrical engineering is a broad and complex field, it can be challenging to prepare for competitive exams in this area. However, with the right approach and resources, it is possible to achieve success. One resource that can be particularly helpful is a set of Electrical Engineering Questions and Answers for competitive exams in PDF format.
Electrical Engineering Questions and Answers for competitive exams PDF |
Electrical Engineering Questions and Answers for competitive exams PDF
Electrical MCQ Questions and Answers PDF
Analog Electronics
Alternators
Amplifiers With Negative Feedback
A.C Fundamentals, Circuits and Circuit Theory
Alternating Current and Voltage
Branch, Loop and Node Analyses
Capacitors
Control Systems
Current Electricity
D.C. Generators
D.C. Motors
Electronics
Electromagnetic Field Theory
Electromagnetic Induction
Electrical Engineering Materials
Electronics and Instrumentation
Electrical Machine Design
Electronic Devices and Circuits
Earthing or Grounding
Electric Traction
Electrical Cables
Electrical Control Systems
Electrical Inductors
Electrolysis and Storage of Batteries
Electrostatics
Energy and Power
Economics of Power Generation
FET(Field Effect Transistors)
Heating and Welding
Hybrid Parameters
Integrated Circuits
Industrial Drivers
Materials and Components
Magnetism and Electromagnetism
Modulation and Demodulation
Measurement and Instrumentation
Microprocessors
Magnetic Circuit
Microwave Communication
Multistage Transistor Amplifiers
Networks Analysis and Synthesis
Power Electronics
Polyphase Induction Motors
Parallel Circuits
Power Plant Engineering in EE
Passive Filters
Regulated DC Power Supply
Radio Receivers
RL Circuits
RC Circuits
RLC Circuits and Resonance
Rectifiers and Converters
Satellite Communication
Ohms Law
OP amp
Oscillators
Switchgear Protections
Single Stage Transistor Amplifiers
Synchronous Motors
Semiconductor Theory
Semiconductor Diode
Silicon Controlled Rectifiers
Series Circuits
Series Parallel Circuits
Solid State Switching Circuits
Single Phase Induction Motors
Time Response of Reactive Circuits
Transistors
Transistor Audio Power Amplifiers
Three Phase Systems In Power Applications
Transformers
Transmission and Distribution
Theorems and Conversions
Theorems In Ac Analysis
Voltage, Current and Resistance
Electrical Engineering Questions and Answers for competitive exams PDF
Here are some multiple choice questions and answers in electrical engineering:
- What is Ohm's law?
a) V = IR
b) P = IV
c) I = V/R
d) V = I^2R
Answer: a) V = IR
- What is the unit of electrical resistance?
a) Ohm
b) Ampere
c) Volt
d) Watt
Answer: a) Ohm
- What is a diode?
a) A two-terminal electronic component
b) A type of battery
c) A type of motor
d) A type of generator
Answer: a) A two-terminal electronic component
- What is the purpose of a capacitor in an electrical circuit?
a) Store electrical energy
b) Convert AC to DC
c) Increase voltage
d) Decrease current
Answer: a) Store electrical energy
- What is the purpose of an inductor in an electrical circuit?
a) Store electrical energy
b) Convert AC to DC
c) Increase voltage
d) Decrease current
Answer: a) Store electrical energy
Here are some multiple choice questions and answers in electrical engineering:
- What is Ohm's law? a) V = IR b) P = IV c) I = V/R d) V = I^2R
Answer: a) V = IR
- What is the unit of electrical resistance? a) Ohm b) Ampere c) Volt d) Watt
Answer: a) Ohm
- What is a diode? a) A two-terminal electronic component b) A type of battery c) A type of motor d) A type of generator
Answer: a) A two-terminal electronic component
- What is the purpose of a capacitor in an electrical circuit? a) Store electrical energy b) Convert AC to DC c) Increase voltage d) Decrease current
Answer: a) Store electrical energy
- What is the purpose of an inductor in an electrical circuit? a) Store electrical energy b) Convert AC to DC c) Increase voltage d) Decrease current
Answer: a) Store electrical energy
Electrical Engineering Questions and Answers for competitive exams PDF
1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?
a) Capacitors
b) Inductors
c) Transistors
d) Resistance
Answer: c (Transistors)
Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. However, this law is only applicable to linear electrical components, such as resistors. Non-linear components like transistors cannot be analyzed using Ohm's law as their electrical behavior is more complex
1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?
a) Capacitors
b) Inductors
c) Transistors
d) Resistance
View Answer
Answer: c
Explanation: Ohm’s law cannot be used for unilateral networks as such networks only allow current flow in one direction. Transistor forms a unilateral network. Thus, Ohm’s law cannot be used on Transistors.
2. What is constant for a charged spherical shell according to basic electrical energy?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: b
Explanation: According to principles of electrical energy, the electrical potential inside the spherical shell is constant and is represented as V = kq/R where k = 1/4πεo. This potential is the same as that of the potential on the surface of the sphere.
3. Where does electro-static shielding occur in a charged spherical shell?
a) When electrical potential outside spherical shell is zero
b) When electrical potential inside the spherical shell is zero
c) When electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: d
Explanation: The electrical field inside the spherical shell is zero and this is basically known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.
4. Which of the following is a correct representation of peak value in an AC Circuit?
a) RMS value/Peak factor
b) RMS value*Form factor
c) RMS value/Form factor
d) RMS value*Peak factor
View Answer
Answer: d
Explanation: A peak factor in an AC circuit represents the ratio of the peak value to the RMS value. The peak factor also called the crest factor indicates how extreme the peaks are present in a waveform.
5. Which of the following according to fundaments of electrical energy is correct about alternating current?
a) Frequency is zero
b) Magnitude changes with time
c) Can be transported to larger distances with less loss in power
d) Flows in both directions
View Answer
Answer: a
Explanation: An alternating current changes its value with time and flows in both directions. The loss in power is less due to alternating current properties and thus, can be transported to larger distances.
1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law? a) Capacitors b) Inductors c) Transistors d) Resistance Answer: c (Transistors) Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. However, this law is only applicable to linear electrical components, such as resistors. Non-linear components like transistors cannot be analyzed using Ohm's law as their electrical behavior is more complex
1. Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law?
a) Capacitors
b) Inductors
c) Transistors
d) Resistance
View Answer
Answer: c
Explanation: Ohm’s law cannot be used for unilateral networks as such networks only allow current flow in one direction. Transistor forms a unilateral network. Thus, Ohm’s law cannot be used on Transistors.
2. What is constant for a charged spherical shell according to basic electrical energy?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: b
Explanation: According to principles of electrical energy, the electrical potential inside the spherical shell is constant and is represented as V = kq/R where k = 1/4πεo. This potential is the same as that of the potential on the surface of the sphere.
3. Where does electro-static shielding occur in a charged spherical shell?
a) When electrical potential outside spherical shell is zero
b) When electrical potential inside the spherical shell is zero
c) When electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: d
Explanation: The electrical field inside the spherical shell is zero and this is basically known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.
4. Which of the following is a correct representation of peak value in an AC Circuit?
a) RMS value/Peak factor
b) RMS value*Form factor
c) RMS value/Form factor
d) RMS value*Peak factor
View Answer
Answer: d
Explanation: A peak factor in an AC circuit represents the ratio of the peak value to the RMS value. The peak factor also called the crest factor indicates how extreme the peaks are present in a waveform.
5. Which of the following according to fundaments of electrical energy is correct about alternating current?
a) Frequency is zero
b) Magnitude changes with time
c) Can be transported to larger distances with less loss in power
d) Flows in both directions
View Answer
Answer: a
Explanation: An alternating current changes its value with time and flows in both directions. The loss in power is less due to alternating current properties and thus, can be transported to larger distances.
Electrical Engineering Questions and Answers for competitive exams PDF
6. How many cycles will an AC signal make in 2 seconds if its frequency is 100 Hz?
a) 50
b) 100
c) 150
d) 200
View Answer
Answer: d
Explanation: In electrical engineering, the frequency represents the ratio of the number of cycles to the total time. Since frequency is given as 100 Hz and the time is 2 sec thus a total of 200 cycles will be made.
7. What will be the direction of the drift velocity of electrons change with respect to the electric field?
a) same as that of electric field
b) opposite to that of electric field
c) perpendicular to that of the electric field in a positive direction
d) perpendicular to that of the electric field in a negative direction
View Answer
Answer: b
Explanation: Basically drift velocity can be said to be the average velocity obtained by the free electrons in metal when an electric field is applied. The direction of drift velocity for the electrons present in metal will be opposite to that of the applied electric field.
8. What will be the current density of metal if a current of 30A is passed through a cross-sectional area of 0.5m2?
a) 7.5 A/m2
b) 15 A/m2
c) 60 A/m2
d) 120 A/m2
View Answer
Answer: c
Explanation: Current density is the ratio of the current flowing in a cross-sectional area. If a current of 30A is passed through a cross-sectional area of 0.5m2.
9. Which of the following is correct about the power consumed by R1 and R2 connected in series if the value of R1 is greater than R2?
a) R1 will consume more power
b) R2 will consume more power
c) R1 and R2 will consume the same power
d) The relationship between the power consumed cannot be established
View Answer
Answer: a
Explanation: In the electrical engineering introduction it is explained that the power can be expressed as P = I2*R. When two resistors are connected in series the current flowing through the resistors is the same and thus, power consumed by the larger resistor will be more.
10. What is zero for a charged spherical shell?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: d
Explanation: According to the fundamentals of the electrical field inside the spherical shell is zero and this is known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.
6. How many cycles will an AC signal make in 2 seconds if its frequency is 100 Hz?
a) 50
b) 100
c) 150
d) 200
View Answer
Answer: d
Explanation: In electrical engineering, the frequency represents the ratio of the number of cycles to the total time. Since frequency is given as 100 Hz and the time is 2 sec thus a total of 200 cycles will be made.
7. What will be the direction of the drift velocity of electrons change with respect to the electric field?
a) same as that of electric field
b) opposite to that of electric field
c) perpendicular to that of the electric field in a positive direction
d) perpendicular to that of the electric field in a negative direction
View Answer
Answer: b
Explanation: Basically drift velocity can be said to be the average velocity obtained by the free electrons in metal when an electric field is applied. The direction of drift velocity for the electrons present in metal will be opposite to that of the applied electric field.
8. What will be the current density of metal if a current of 30A is passed through a cross-sectional area of 0.5m2?
a) 7.5 A/m2
b) 15 A/m2
c) 60 A/m2
d) 120 A/m2
View Answer
Answer: c
Explanation: Current density is the ratio of the current flowing in a cross-sectional area. If a current of 30A is passed through a cross-sectional area of 0.5m2.
9. Which of the following is correct about the power consumed by R1 and R2 connected in series if the value of R1 is greater than R2?
a) R1 will consume more power
b) R2 will consume more power
c) R1 and R2 will consume the same power
d) The relationship between the power consumed cannot be established
View Answer
Answer: a
Explanation: In the electrical engineering introduction it is explained that the power can be expressed as P = I2*R. When two resistors are connected in series the current flowing through the resistors is the same and thus, power consumed by the larger resistor will be more.
10. What is zero for a charged spherical shell?
a) Electrical potential outside the spherical shell
b) Electrical potential inside the spherical shell
c) Electrical field outside the spherical shell
d) Electrical field inside the spherical shell
View Answer
Answer: d
Explanation: According to the fundamentals of the electrical field inside the spherical shell is zero and this is known as electrostatic shielding. The electric field outside the sphere is inversely proportional to the square of the radius.
Electrical Engineering Questions and Answers for competitive exams PDF
11. What kind of quantity is an Electric potential?
a) Vector quantity
b) Tensor quantity
c) Scalar quantity
d) Dimensionless quantity
View Answer
Answer: c
Explanation: Electric potential refers to the work done to bring a unit positive charge from a point with higher potential to a point with lower potential. Since electric potential only has magnitude but no direction, it is a scalar quantity.
12. What do crowded lines of force indicate?
a) Strong electric field
b) Weak electric field
c) Strong electric potential
d) Weak electric potential
View Answer
Answer: a
Explanation: According to the principles of electric fields, when crowded lines of field are present the electric fields are very strong. The strong electric field can be witnessed near the poles of a magnet as the lines of force are crowded in this region.
13. What is the direction of the electric field at a point?
a) Along the line perpendicular to the electric field
b) Along the line tangent to the electric field
c) Electric field has no direction
d) Electric field has a random direction
View Answer
Answer: b
Explanation: According to the basics of the Electric field, it is a vector quantity and has a direction. The direction of the electric field is said to be along the line tangent to the electric field.
14. What is the magnitude of mutually induced emf, E2 in a transformer?
a) directly proportional to rate of change of flux and number of secondary turns
b) inversely proportional to rate of change of flux and number of secondary turns
c) proportional to rate of change of flux and inversely proportional to number of secondary turns
d) inversely proportional to the rate of change of flux and proportional to number of secondary turns
View Answer
Answer: a
Explanation: Due to the supply voltage, a secondary induced emf is produced. V1 is in antiphase with E2 and the magnitude of E2 is proportional to rate of change of flux and number of secondary turns.
11. What kind of quantity is an Electric potential?
a) Vector quantity
b) Tensor quantity
c) Scalar quantity
d) Dimensionless quantity
View Answer
Answer: c
Explanation: Electric potential refers to the work done to bring a unit positive charge from a point with higher potential to a point with lower potential. Since electric potential only has magnitude but no direction, it is a scalar quantity.
12. What do crowded lines of force indicate?
a) Strong electric field
b) Weak electric field
c) Strong electric potential
d) Weak electric potential
View Answer
Answer: a
Explanation: According to the principles of electric fields, when crowded lines of field are present the electric fields are very strong. The strong electric field can be witnessed near the poles of a magnet as the lines of force are crowded in this region.
13. What is the direction of the electric field at a point?
a) Along the line perpendicular to the electric field
b) Along the line tangent to the electric field
c) Electric field has no direction
d) Electric field has a random direction
View Answer
Answer: b
Explanation: According to the basics of the Electric field, it is a vector quantity and has a direction. The direction of the electric field is said to be along the line tangent to the electric field.
14. What is the magnitude of mutually induced emf, E2 in a transformer?
a) directly proportional to rate of change of flux and number of secondary turns
b) inversely proportional to rate of change of flux and number of secondary turns
c) proportional to rate of change of flux and inversely proportional to number of secondary turns
d) inversely proportional to the rate of change of flux and proportional to number of secondary turns
View Answer
Answer: a
Explanation: Due to the supply voltage, a secondary induced emf is produced. V1 is in antiphase with E2 and the magnitude of E2 is proportional to rate of change of flux and number of secondary turns.
Electrical Engineering Questions and Answers for competitive exams PDF
15. Which of the following will happen in a transformer when the number of secondary turns is less than the number of primary turns?
a) The voltage gets stepped up
b The voltage gets stepped down
c) The power gets stepped up
d) The power gets stepped down
View Answer
Answer: b
Explanation: The voltage transformation ratio is basically the ratio of the number of secondary turns to that of the number of primary turns. When the transformation ratio is less than 1, the step-down operation occurs.
16. What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?
a) 5
b) 10
c) 20
d) 40
View Answer
Answer: c
Explanation: The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the number of primary turns in a 200/1000 V transformer with emf per turn of 10V is 200/10 = 20.
17. Which of the following is a correct representation of average value in an AC Circuit?
a) RMS value/Form factor
b) RMS value*Form factor
c) RMS value/Peak factor
d) RMS value*Peak factor
View Answer
Answer: a
Explanation: The form factor basically gives the expression for DC of equal power to a given AC. A form factor in an AC circuit represents the ratio of the RMS value to the average value. Thus, average value = RMS value/Form factor.
18. Who defined electric current and devised a method to measure current?
a) Michael Faraday
b) Andre-Marie Ampere
c) Nikola Tesla
d) Alessandro Antonio Volta
View Answer
Answer: b
Explanation: Andre-Marie Ampere is a French physicist and mathematician who defined electric current and devised a method to measure current in the 1820s.
19. How many electrons will constitute 2 Coulombs of electric charge?
a) 6.24 * 1018 electrons
b) 12.48 * 1018 electrons
c) 1.602 * 1019 electrons
d) 3.204 * 1019 electrons
View Answer
Answer: b
Explanation: One Coulomb of charge consists of 1/(1.602*10-19) electron that is 6.24 * 1018 electrons. A coulomb is a unit for the charge. Thus, for 2 Coulombs of charge will have 6.24 * 1018 * 2 = 12.48 * 1018 electrons.
Electrical Engineering Questions and Answers for competitive exams PDF
20. Which of the following is correct about direct current?
a) Magnitude is constant
b) Frequency is zero
c) Can be transported to larger distances with less loss in power
d) Flows in one direction
View Answer
Answer: c
Explanation: A direct current has a fixed value and does not change with time. The frequency of the direct current is equal to zero as it does not change with time.
21. Who witnessed the effect of magnetism for the first time?
a) Hans Christian Orsted
b) Alexander Graham Bell
c) Michael Faraday
d) Gustav Robert Kirchhoff
View Answer
Answer: a
Explanation: Hans Christian Orsted was a Danish physicist and chemist who witnessed the effect of magnetism for the first time. He discovered that electric current can create a magnetic field using an experiment.
22. Which of the following according is correct about electrical conductivity?
a) It is the ratio of current density to the electric field
b) It is the product of current density and electric field
c) It is the ratio of the electric field to current density
d) It is the reciprocal of the product of current density and electric field
View Answer
Answer: a
Explanation: Electrical conductivity gives the ability of a conductor to conduct electric current. The point form of Ohm’s law says that the electrical conductivity (σ) is the ratio of current density (J) to electric field (E).
23. What is responsible for the current to flow?
a) Protons
b) Electrons
c) Nucleus
d) Protons and Electrons
View Answer
Answer: b
Explanation: For the current to flow in a circuit electrons are required. Electrons are negatively charged and when the potential difference is applied these electrons flow to constitute a current. The current direction is opposite to the electron flow.
24. Which of the following according to KCL must be zero?
a) Algebraic sum of currents in closed-loop
b) Algebraic sum of power in closed-loop
c) Algebraic sum of currents entering and leaving a junction
d) Algebraic sum of voltages across the input and output
View Answer
Answer: c
Explanation: KCL or Kirchhoff’s current law helps in finding the currents flowing in the circuit. KCL states that the current entering a junction is equal to the current leaving a junction.
25. How many directions can the electric field at a point have?
a) Zero
b) One
c) Two
d) Many
View Answer
Answer: b
Explanation: Electric field is a vector quantity and has a direction. The direction of the electric field is said to be along the line tangent to the electric field. Thus, the electric field at a point has one direction.
15. Which of the following will happen in a transformer when the number of secondary turns is less than the number of primary turns?
a) The voltage gets stepped up
b The voltage gets stepped down
c) The power gets stepped up
d) The power gets stepped down
View Answer
Answer: b
Explanation: The voltage transformation ratio is basically the ratio of the number of secondary turns to that of the number of primary turns. When the transformation ratio is less than 1, the step-down operation occurs.
16. What is the number of primary turns in a 200/1000 V transformer if the emf per turn is 10V?
a) 5
b) 10
c) 20
d) 40
View Answer
Answer: c
Explanation: The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the number of primary turns in a 200/1000 V transformer with emf per turn of 10V is 200/10 = 20.
17. Which of the following is a correct representation of average value in an AC Circuit?
a) RMS value/Form factor
b) RMS value*Form factor
c) RMS value/Peak factor
d) RMS value*Peak factor
View Answer
Answer: a
Explanation: The form factor basically gives the expression for DC of equal power to a given AC. A form factor in an AC circuit represents the ratio of the RMS value to the average value. Thus, average value = RMS value/Form factor.
18. Who defined electric current and devised a method to measure current?
a) Michael Faraday
b) Andre-Marie Ampere
c) Nikola Tesla
d) Alessandro Antonio Volta
View Answer
Answer: b
Explanation: Andre-Marie Ampere is a French physicist and mathematician who defined electric current and devised a method to measure current in the 1820s.
19. How many electrons will constitute 2 Coulombs of electric charge?
a) 6.24 * 1018 electrons
b) 12.48 * 1018 electrons
c) 1.602 * 1019 electrons
d) 3.204 * 1019 electrons
View Answer
Answer: b
Explanation: One Coulomb of charge consists of 1/(1.602*10-19) electron that is 6.24 * 1018 electrons. A coulomb is a unit for the charge. Thus, for 2 Coulombs of charge will have 6.24 * 1018 * 2 = 12.48 * 1018 electrons.
Electrical Engineering Questions and Answers for competitive exams PDF
20. Which of the following is correct about direct current?
a) Magnitude is constant
b) Frequency is zero
c) Can be transported to larger distances with less loss in power
d) Flows in one direction
View Answer
Answer: c
Explanation: A direct current has a fixed value and does not change with time. The frequency of the direct current is equal to zero as it does not change with time.
21. Who witnessed the effect of magnetism for the first time?
a) Hans Christian Orsted
b) Alexander Graham Bell
c) Michael Faraday
d) Gustav Robert Kirchhoff
View Answer
Answer: a
Explanation: Hans Christian Orsted was a Danish physicist and chemist who witnessed the effect of magnetism for the first time. He discovered that electric current can create a magnetic field using an experiment.
22. Which of the following according is correct about electrical conductivity?
a) It is the ratio of current density to the electric field
b) It is the product of current density and electric field
c) It is the ratio of the electric field to current density
d) It is the reciprocal of the product of current density and electric field
View Answer
Answer: a
Explanation: Electrical conductivity gives the ability of a conductor to conduct electric current. The point form of Ohm’s law says that the electrical conductivity (σ) is the ratio of current density (J) to electric field (E).
23. What is responsible for the current to flow?
a) Protons
b) Electrons
c) Nucleus
d) Protons and Electrons
View Answer
Answer: b
Explanation: For the current to flow in a circuit electrons are required. Electrons are negatively charged and when the potential difference is applied these electrons flow to constitute a current. The current direction is opposite to the electron flow.
24. Which of the following according to KCL must be zero?
a) Algebraic sum of currents in closed-loop
b) Algebraic sum of power in closed-loop
c) Algebraic sum of currents entering and leaving a junction
d) Algebraic sum of voltages across the input and output
View Answer
Answer: c
Explanation: KCL or Kirchhoff’s current law helps in finding the currents flowing in the circuit. KCL states that the current entering a junction is equal to the current leaving a junction.
25. How many directions can the electric field at a point have?
a) Zero
b) One
c) Two
d) Many
View Answer
Answer: b
Explanation: Electric field is a vector quantity and has a direction. The direction of the electric field is said to be along the line tangent to the electric field. Thus, the electric field at a point has one direction.
Electrical Engineering Questions and Answers for competitive exams PDF
26. Which of the following will happen in a transformer when the number of secondary turns is greater than the number of primary turns?
a) The voltage gets stepped up
b) The voltage gets stepped down
c) The power gets stepped up
d) The power gets stepped down
View Answer
Answer: a
Explanation: The voltage transformation ratio is the ratio of the number of secondary turns to that of the number of primary turns. When the transformation ratio is greater than 1, the step-up operation occurs.
27. Which of the following is correct about the voltage transformation ratio in electrical engineering?
a) Ratio of number of primary turns to the number of secondary turns
b) Ratio of induced emf in secondary to induced emf in primary
c) Ratio of secondary current to the primary current
d) Ratio of power in primary to power in secondary
View Answer
Answer: b
Explanation: The voltage transformation ratio is the ratio of the number of secondary turns to the number of primary turns. This can also be expressed as the ratio of induced emf in secondary to induced emf in primary or ratio of primary current to secondary current.
28. Which of the following according to the fundamentals of electrical engineering is correct about the induced emf in primary of transformer?
a) It is the ratio of primary turns to emf induced per turn
b) It is the product of primary turns and emf induced per turn
c) It is the ratio of secondary turns to emf induced per turn
d) It is the product of secondary turns and emf induced per turn
View Answer
Answer: b
Explanation: The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the induced emf in the primary of the transformer is the product of primary turns and emf induced per turn.
29. Which of the following current is drawn by the primary circuit of an ideal transformer when the secondary is open?
a) Secondary current
b) Leakage current
c) Magnetizing current
d) Working on current
View Answer
Answer: c
Explanation: When the secondary is open no current flows through the load, thus no secondary current is drawn. The primary coil for an ideal transformer is purely inductive and thus, only draws magnetizing current.
30. What does positive power in an electrical element indicate?
a) Element is absorbing power
b) Element is supplying power
c) Element may absorb or supply power
d) Element is neither absorbing nor supplying power
View Answer
Answer: a
Explanation: Power in an electrical element is the product of voltage and current. Positive power will be established when both voltage and current are positive or both are negative. Positive power will indicate that the element is absorbing power.
26. Which of the following will happen in a transformer when the number of secondary turns is greater than the number of primary turns?
a) The voltage gets stepped up
b) The voltage gets stepped down
c) The power gets stepped up
d) The power gets stepped down
View Answer
Answer: a
Explanation: The voltage transformation ratio is the ratio of the number of secondary turns to that of the number of primary turns. When the transformation ratio is greater than 1, the step-up operation occurs.
27. Which of the following is correct about the voltage transformation ratio in electrical engineering?
a) Ratio of number of primary turns to the number of secondary turns
b) Ratio of induced emf in secondary to induced emf in primary
c) Ratio of secondary current to the primary current
d) Ratio of power in primary to power in secondary
View Answer
Answer: b
Explanation: The voltage transformation ratio is the ratio of the number of secondary turns to the number of primary turns. This can also be expressed as the ratio of induced emf in secondary to induced emf in primary or ratio of primary current to secondary current.
28. Which of the following according to the fundamentals of electrical engineering is correct about the induced emf in primary of transformer?
a) It is the ratio of primary turns to emf induced per turn
b) It is the product of primary turns and emf induced per turn
c) It is the ratio of secondary turns to emf induced per turn
d) It is the product of secondary turns and emf induced per turn
View Answer
Answer: b
Explanation: The number of primary turns is the ratio of induced emf in the primary to the emf induced per turn. Thus, the induced emf in the primary of the transformer is the product of primary turns and emf induced per turn.
29. Which of the following current is drawn by the primary circuit of an ideal transformer when the secondary is open?
a) Secondary current
b) Leakage current
c) Magnetizing current
d) Working on current
View Answer
Answer: c
Explanation: When the secondary is open no current flows through the load, thus no secondary current is drawn. The primary coil for an ideal transformer is purely inductive and thus, only draws magnetizing current.
30. What does positive power in an electrical element indicate?
a) Element is absorbing power
b) Element is supplying power
c) Element may absorb or supply power
d) Element is neither absorbing nor supplying power
View Answer
Answer: a
Explanation: Power in an electrical element is the product of voltage and current. Positive power will be established when both voltage and current are positive or both are negative. Positive power will indicate that the element is absorbing power.
Electrical Engineering Questions and Answers for competitive exams PDF
31. How does induce emf in DC motor react to supply voltage?
a) It will aid the supply voltage
b) It will be double the supply voltage
c) It will oppose the supply voltage
d) It will be half of the supply voltage
View Answer
Answer: c
Explanation: Lenz’s law suggests that the direction of induced emf is such that it opposes the cause. The supply voltage will be the cause in this case. Thus induced emf will oppose the supply voltage.
32. Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?
a) Unilateral
b) Bilateral
c) Linear
d) Conductors
View Answer
Answer: a
Explanation: Ohm’s law cannot be used for analyzing unilateral networks as such networks only allow current flow in one direction. A unilateral network can consist diode, transistor, etc.
33. Which of the following according to KVL must be zero?
a) Algebraic sum of currents in closed-loop
b) Algebraic sum of power in closed-loop
c) Algebraic sum of losses in closed-loop
d) Algebraic sum of voltages in closed-loop
View Answer
Answer: d
Explanation: KVL or Kirchhoff’s voltage law proves the law of conservation of energy around a closed path. KVL can be used in the circuit to find the circuit parameters by considering that the algebraic sum of voltages in a closed loop is zero.
31. How does induce emf in DC motor react to supply voltage?
a) It will aid the supply voltage
b) It will be double the supply voltage
c) It will oppose the supply voltage
d) It will be half of the supply voltage
View Answer
Answer: c
Explanation: Lenz’s law suggests that the direction of induced emf is such that it opposes the cause. The supply voltage will be the cause in this case. Thus induced emf will oppose the supply voltage.
32. Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm’s law?
a) Unilateral
b) Bilateral
c) Linear
d) Conductors
View Answer
Answer: a
Explanation: Ohm’s law cannot be used for analyzing unilateral networks as such networks only allow current flow in one direction. A unilateral network can consist diode, transistor, etc.
33. Which of the following according to KVL must be zero?
a) Algebraic sum of currents in closed-loop
b) Algebraic sum of power in closed-loop
c) Algebraic sum of losses in closed-loop
d) Algebraic sum of voltages in closed-loop
View Answer
Answer: d
Explanation: KVL or Kirchhoff’s voltage law proves the law of conservation of energy around a closed path. KVL can be used in the circuit to find the circuit parameters by considering that the algebraic sum of voltages in a closed loop is zero.
Electrical Engineering Questions and Answers for competitive exams PDF
A good conductor should have1. the resistivity must be high2. the resistivity must be low3. the resitivity is zero4. the resistivity is infinitiveOption 2 : the resistivity must be low
A fuse protects an electric circuit by which of the following?1. Overloading2. Current3. Current sport 4. Current uptake Option 1 : Overloading
Which of the following is a measure of the flow of electric charge over time?1. Power2. Voltage4. Current 5. Air
Which is not defining the unit of electric current? 1. coulomb/sec 2. Farad-coulomb/sec 3. Volt/Ω 4. ampereOption 2 : Farad-coulomb/sec
A fuse protects an electric circuit by which of the following?1. Overloading2. Transforming one form of energy into another3. Current sport4. Current uptakeOption 1 : Overloading
A source of voltage V maintains a current I in a circuit. The power (P) input to the circuit by the source is given by:1. P = V I2. P = V/I3. P = I/V4. P = 1/(V I)Option 1 : P = V I
The capacitance of capacitor is NOT influenced by1. Plate thickness2. Plate area3. Plate separationOption 1 : Plate thickness
Ampere-hour is a unit of 1. Quantity of electricity 2. Strength of current 3. Power 4. EnergyOption 1 : Quantity of electricity
For domestic wiring purposes, how are circuits connected1. Straight 2. Parallel 3. Serial 4. SeriesOption 2 : Parallel
Electrical Engineering Questions and Answers for competitive exams PDF
When three identical bulbs of 60watt, 200volt rating are connected in series to a 200volt supply, the power drawn by them will be 1. 180 watt 2. 10 watt3. 20 watt4. 60 wattOption 3 : 20 watt
Which of the following is a measure of the flow of electric charge over time?1. Power2. Voltage3. Energy4. CurrentThe correct answer is Option 4 : Current
A dynamo is sometimes said to generate electricity. It actually acts as a source of1. charge2. magnetism3. energyThe correct answer is Option 3 : energy
Conduction of current in both directions in an element (example: Resistance; Inductance; Capacitance) with the same magnitude is termed as ______.1. bilateral element2. passive element3. active element4. unilateral elementThe correct answer is option 1):(bilateral element)
1. In gases the flow of current is due toA. Electrons onlyB. Positive ions onlyC. Electrons and positive ionsD. Electrons, positive ions and negative ionsView AnswerD. Electrons, positive ions and negative ions
2. The flow of current in solids is due toA. ElectronsB. Electrons and ionsC. AtomsD. NucleusView AnswerA. Electrons
3. The minimum requirements for causing flow of current areA. A voltage source, a resistor and a switchB. A voltages source and a conductorC.. A power source and a bulbD. A voltage source, a conductor an ammeter and a switch✔ View AnswerB. A voltages source and a conductor
4. An instrument which detects electric current is known asA. VoltmeterB. RheostatC. WattmetreD. Galvanometer✔ View AnswerD. Galvanometer
5. Electric pressure is also calledA. ResistanceB. PowerC. VoltageD. Energy✔ View AnswerC. Voltage
Electrical Engineering Questions and Answers for competitive exams PDF
6. Which of the following ampere-second could be the unit?A. ReluctanceB. ChargeC. PowerD. Energy✔ View AnswerB. Charge
7. The rating of the fuse wire is always expressed inA. Ampere-hoursB. Ampere-voltsC. KWHD. Ampere✔ View AnswerD. Ampere
8. The S.I. unit of power isA. HenryB. CoulombC. WattD. Watt-hour✔ View AnswerC. Watt
9. Temperature coefficient of resistance is expressed in terms ofA. Ohms/oCB. Mhos/ohmoCC. Ohms/ohmoCD. Mhos/oC✔ View AnswerC. Ohms/ohmoC
10. One newton metre is same asA. One wattB. 1 jouleC. 5 joulesD. 1 joule/sec✔ View AnswerB. 1 joule
11. Which of the following materials has the least resistivity?A. ZincB. LeadC. MercuryD. Copper✔ View AnswerD. Copper
12. Which of the following can have negative temperature coefficient ?A. Compounds of silverB. Liquid metalsC. Metallic alloysD. Electrolytes✔ View AnswerD. Electrolytes
13. Which of the following method can be used for absolute measurement ofresistance?A. Lorentz methodB. Releigh methodC. Ohm's law methodD. Wheatstone bridge method✔ View AnswerD. Wheatstone bridge method
14. Which of the following does not have negative temperature co-efficient ?A. AluminiumB. PaperC. RubberD. Mica✔ View AnswerA. Aluminium
15. Which is the best conductor of electricity?A. IronB. SilverC. CopperD. Carbon✔ View AnswerB. Silver
Electrical Engineering Questions and Answers for competitive exams PDF
16. The filament of an electric bulb is made ofA. CarbonB. AluminiumC. TungstenD. Nickel✔ View AnswerC. Tungsten
17. Which of the following materials has a negative temperature coefficient ofresistance?A. CopperB. AluminiumC. CarbonD. Brass✔ View AnswerC. Carbon
18. Which of the following material has nearly zero temperature coefficient ofresistance?A. ManganinB. PorcelainC. CarbonD. Copper✔ View AnswerA. Manganin
19. The substance which have a large number of free electrons and offer aresistance are calledA. InsulatorsB. InductorsC. SemiconductorsD. Conductors✔ View AnswerD. Conductors
20. The resistance of human body is aroundA. 50 OhmsB. 25 OhmesC. 250 OhmsD. 1000 Ohm's✔ View AnswerD. 1000 Ohm's
21. 1 Coulomb charge equals the charge onA. 6.24 x 1012 electronsB. 6.24 x 1014 electronsC. 6.24 x 1016 electronsD. 6.24 x 1018 electrons✔ View AnswerD. 6.24 x 1018 18 electrons
22. The resistance of a conductor varies inversely asA. LengthB. Area of cross-sectionC. TemperatureD. Resistivity✔ View AnswerB. Area of cross-section
23. With rise in temperature the resistance of pure metalsA. IncreasesB. DecreasesC. . First increases and then decreasesD. Remains constant✔ View AnswerA. Increases
24. With the rise in temperature the resistance of semiconductorsA. IncreasesB. DecreasesC. First increases and then decreasesD. Remains constant✔ View AnswerB. Decreases
25. The property of the conductor due to which it passes current is calledA. ResistanceB. ReluctanceC. ConductanceD. Inductance✔ View AnswerC. Conductance
Electrical Engineering Questions and Answers for competitive exams PDF
26. Resistance of a wire always increases ifA. Temperature is reducedB. Temperature is increasedC. Number of free electrons available become lessD. Number of free electrons available become more✔ View Answer
31. A closed switch has a resistance ofA. ZeroB. About 50 ohmsC. About 500 ohmsD. Infinity✔ View AnswerA. Zero
32. Who in one leg of parallel circuit is opened out the total current willA. ReduceB. IncreaseC. DecreaseD. Become zero✔ View AnswerC. Decrease
33. Which of the following quantities remain the same in all parts of a series circuit?A. VoltageB. CurrentC. PowerD. Resistance✔ View AnswerB. Current
34. Heat in a conductor is produced on the passage of electric current due toA. ReactanceB. CapacitanceC. ImpedanceD. Resistance✔ View AnswerD. Resistance
35. The insulation on a current carrying conductor is providedA. To prevent leakage of currentB. To prevent a shockC. Both of the aboveD. None of the above✔ View AnswerC. Both of the above
27. Pure metals generally haveA. High conductivity and low temperature coefficientB. High conductivity and large temperature coefficientC. Low conductivity and zero temperature coefficientD. Low conductivity and high-temperature coefficient✔ View AnswerB. High conductivity and large temperature coefficient
28. The temperature coefficient of resistance of an insulator isA. Positive and independent of temperatureB. Negative and independent of temperatureC. Negative and dependent on temperatureD. Positive and dependent on temperature✔ View AnswerC. Negative and dependent on temperature
29. Specific resistance of a conductor depends uponA. Dimensions of the conductorB. Composition of contactor materialC. Resistance of the conductorD. Both A and B✔ View AnswerD. Both A and B
30. Which of the following materials posses the least specific resistance?A. AluminiumB. CopperC. SilverD. Iron✔ View AnswerC. Silver
Electrical Engineering Questions and Answers for competitive exams PDF
36. A field of force can exist only betweenA. Two moleculesB. Two ionsC. Two atomsD. Two metal particles✔ View AnswerB. Two ions
37. Balbs in street lighting are all connected inA. ParallelB. SeriesC. Series-parallelD. End to end✔ View AnswerA. Parallel
38. Sparking occurs when a load is switched off because the circuit has highA. ResistanceB. InductanceC. CapacitanceD. Impedance✔ View AnswerB. Inductance
39. Three 6 ohms resistors are connected to from a triangle. What is the resistancebetween any two corners?A. 3/2 ohmB. 6 ohmC. 4 ohmD. 8/3 ohm✔ View AnswerC. 4 ohm
40. Voltage dependent resistors are usually made fromA. CharcoalB. Silicon carbideC. NichromeD. Graphite✔ View AnswerC. Nichrome
41. Two resistors are set to be connected in series whenA. Same current passes in turn through bodyB. Both carry the same value of currentC. Total current equals the sum of branch currentsD. Some of I.R. drops equal the applied e.m.f.✔ View AnswerA. Same current passes in turn through body
42. Varistors areA. InsulatorsB. Non-linear resistersC. Carbon resistorsD. Resisters with zero temperature coefficient✔ View AnswerB. Non-linear resisters
43. Insulating materials have the function ofA. Preventing a short circuit between conducting wireB. Preventing an open circuit between the voltage source and the loadC. Conducting very large currentsD. Storing very high currents✔ View AnswerA. Preventing a short circuit between conducting wire
44. The minimum charge of an ion isA. Equal to the atomic number of the atomB. Equal to the charge of an electronC. Equal to the charge of the number of electrons in an atomD. Zero✔ View AnswerB. Equal to the charge of an electron
45. If the efficiency of a machine is to be high, what should be low?A. Input powerB. LossesC. Ratio of output to inputD. All of the above✔ View AnswerB. Losses
Electrical Engineering Questions and Answers for competitive exams PDF
46. For testing appliances, the wattage of test lamp should beA. Very lowB. LowC. HighD. Any value✔ View AnswerC. High
47. In the case of direct currentA. Magnitude and direction of current remains constantB. Magnitude and direction of current changes with timeC. Magnitude of current changes with timeD. Magnitude of current remains constant✔ View AnswerA. Magnitude and direction of current remains constant
48. Voltage dependent resistors are usedA. For inductive circuitsB. To suppress surgesC. An heating elementsD. As current stabilizers✔ View AnswerB. To suppress surges
49. Which of the following could be the value of resistivity of copper ?A. 1.72 × 10-4 Ω-mB. 1.72 × 10-9 Ω-mC. 1.72 × 10-6 Ω-mD. 1.72 × 10-8 Ω-m✔ View AnswerD. 1.72 × 10-8 Ω-m
50. Specific resistance of a substance is measured inA. Ω/mB. Ω/m2C. Ω-mD. m/Ω✔ View AnswerC. Ω-m
Read More MCQ on Electrical
To find a set of Electrical Engineering Questions and Answers for competitive exams in PDF format, you can search the internet using keywords such as "electrical engineering competitive exam questions and answers pdf" or "electrical engineering mcq pdf". One website that offers a wide range of Electrical Engineering MCQs is mcqquestions.net. This website has a large collection of multiple choice questions on various electrical engineering topics, which can be downloaded in PDF format for free.
When studying from these question and answer sets, it's important to not just memorize the answers but understand the concept behind it, try solving the question by yourself first before looking into the answer. Also, practice as much as possible, as practice makes perfect.
In addition to studying from question and answer sets, there are other ways to prepare for competitive exams in electrical engineering. These include studying from textbooks, attending classes and lectures, and working through practice problems
How to prepare for electrical engineering competitive exams?
To prepare for electrical engineering competitive exams, it is important to first understand the format and content of the exam. Review the syllabus and past papers to get a sense of the types of questions that are likely to be asked. Then, create a study plan that focuses on the key topics covered in the exam.
One helpful resource for studying for electrical engineering exams is the website mcqquestions.net, which offers a wide range of multiple choice questions (MCQs) on various topics related to electrical engineering. These questions can be used to test your knowledge and identify areas where you need to focus your studies. Additionally, the website also provides answers and explanations to help you understand the reasoning behind each question.
It is also important to practice problem-solving skills, as many competitive exams include problems and calculations that require you to apply your knowledge. Practice solving sample problems and working through practice exams to become comfortable with the types of problems you will encounter on the actual exam.
Other useful tips include staying up-to-date with current developments in the field, taking care of your physical and mental health, and staying motivated.
Electrical MCQ Questions and Answers pdf
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