Theory of Machines Questions and Answers Pdf
1. In considering friction of a V-thread, the virtual coefficient of friction (μ ) isgiven by
A. μ1 = μsinβ
B. μ1 = μcosβ
C. μ1 = μ/sinβ
D. μ1 = μ/ cos β
Answer: Option D
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2. The lower pairs are _________ pairs.
A. Self-closed
B. Force-closed
C. Friction closed
D. None of these
Answer: Option A
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3. In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
A. Sliding
B. Turning
C. Rolling
D. Screw
Answer: Option B
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4. A kinematic chain is known as a mechanism when
A. None of the links is fixed
B. One of the links is fixed
C. Two of the links are fixed
D. None of these
Answer: Option B
5. A pantograph is a mechanism with
A. Lower pairs
B. Higher pairs
C. Rolling pairs
D. Turning pairs
Answer: Option A
Theory of Machines Questions and Answers Pdf
6. A ball and a socket forms a
A. Turning pair
B. Rolling pair
C. Screw pair
D. Spherical pair
Answer: Option D
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7. In a gear having involute teeth, the normal to the involute is a tangent to the
A. Pitch circle
B. Base circle
C. Addendum circle
D. Dedendum circle
Answer: Option B
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8. A mechanism is an assemblage of
A. Two links
B. Three links
C. Four or more than four links
D. All of these
Answer: Option C
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9. Which of the following statement is correct as regard to the difference between a machine and a structure?
A. The parts of a machine move relative to one another, whereas the members of a
structure do not move relative to one another
B. The links of a machine may transmit both power and motion, whereas the
members of a structure transmit forces only
C. A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
D. All of the above
Answer: Option D
10. In a four-bar chain it is required to give an oscillatory motion to the
follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is
A. 95 mm
B. Slightly less than 95 mm
C. Slightly more than 95 mm
D. 45 mm
Answer: Option B
Theory of Machines Questions and Answers Pdf
11. Which type of gear train is used in clock mechanism to join hour hand and minute hand?
A. Simple gear train
B. Compound gear train
C. Reverted gear train
D. Epicyclic gear train
Answer: Option D
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12. A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will
A. Remain same as before
B. Become equal to 2R
C. Become equal to R/2
D. Become equal to R/4
Answer: Option A
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13. The relation I = 2/3(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
A. One lower pair and two additional links
B. Two lower pairs and one additional link
C. Two lower pairs and two additional links
D. Any one of these
Answer: Option B
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14. A circle passing through the pitch point with its center at the center of cam axis is known as
A. Pitch circle
B. Base circle
C. Prime circle
D. Outer circle
Answer: Option C
15. Cylindrical cams can be classified as
A. Circular
B. Tangent
C. Reciprocating
D. None of the above
Answer: Option D
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Theory of Machines Questions and Answers Pdf
19. When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
A. Simple pendulum
B. Compound pendulum
C. Torsional pendulum
D. Second's pendulum
Answer: Option B
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20. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is
A. Flexible coupling
B. Universal coupling
C. Chain coupling
D. Oldham's coupling
Answer: Option B
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21. The pressure angle of a cam depends upon
A. Offset between center lines of cam and follower
B. Lift of follower
C. Angle of ascent
D. All of the above
Answer: Option D
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22. The size of cam depends upon
A. Base circle
B. Pitch circle
C. Prime circle
D. Pitch curve
Answer: Option A
25. The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
A. ωR cos θ
B. ω(R − r1 ) cos θ
C. ω(R − r1 ) cos θ
D. ω(R − r1 ) sin θ
Answer: Option C
Theory of Machines Questions and Answers Pdf
26. Klein's construction can be used when
A. Crank has a uniform angular velocity
B. Crank has non-uniform velocity
C. Crank has uniform angular acceleration
D. Crank has uniform angular velocity and angular acceleration
Answer: Option A
27. For the same lift and same angle of ascent, a smaller base circle will give
A. A small value of pressure angle
B. A large value of pressure angle
C. There is no such relation with pressure angle
D. Something else
Answer: Option B
28. Klein's construction gives a graphic construction for
A. Slider-crank mechanism
B. Velocity polygon
C. Acceleration polygon
D. Four bar chain mechanism
Answer: Option C
29. For simple harmonic motion of the of follower, a cosine curve represents
A. Displacement diagram
B. Velocity diagram
C. Acceleration diagram
D. All of the above
Answer: Option C
30. The locus of a point on a thread unwound from a cylinder will be
A. A straight line
B. A circle
C. Involute
D. Cycloidal
Answer: Option C
Theory of Machines Questions and Answers Pdf
31. In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
A. Total lift, total angle of lift, minimum radius of cam and cam speed
B. Radius of circular arc, cam speed, location of centre of circular arc and roller diameter
C. Mass of cam follower linkage, spring stiffness and cam speed
D. Total lift, centre of gravity of the cam and cam speed
Answer: Option A
32. The critical speed of a shaft depends upon its
A. Mass
B. Stiffness
C. Mass and stiffness
D. Stiffness and eccentricity
Answer: Option C
33. The Klein's method of construction for reciprocating engine mechanism
A. Is based on acceleration diagram
B. Is a simplified form of instantaneous center method
C. Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine
D. Enables determination of Cariole’s component
Answer: Option C
34. The driving and driven shafts connected by a Hooke's joint will have equal speeds, if
A. cosθ = sinα
B. sinθ = ± tanα
C. tanθ = ± cosα
D. cotθ = cosα
Answer: Option C
35. A cam mechanism imparts following motion
A. Rotating
B. Oscillating
C. Reciprocating
D. All of the above
Answer: Option D
Theory of Machines Questions and Answers Pdf
36. A foot step bearing and rotor of a vertical turbine form examples of
A. Incompletely constrained motion
B. Partially constrained motion
C. Completely constrained motion
D. Successfully constrained motion
Answer: Option B
37. A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
A. Magnitude of the forces on journal
B. Angular velocity of journal
C. Clearance between journal and bearing
D. Radius of journal
Answer: Option D
38. Which of the following mechanism is obtained from lower pair?
A. Gyroscope
B. Pantograph
C. Valve and valve gears
D. All of the above
Answer: Option D
39. Ackermann steering gear consists of
A. Sliding pairs
B. Turning pairs
C. Rolling pairs
D. Higher pairs
Answer: Option B
40. Davis steering gear consists of
A. Sliding pairs
B. Turning pairs
C. Rolling pairs
D. Higher pairs
Answer: Option A
Theory of Machines Questions and Answers Pdf
41. The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
A. Parallel
B. Perpendicular
C. Both A and B
D. None of these
Answer: Option B
42. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
A. Less sensitive
B. More sensitive
C. Unaffected of sensitivity
D. Isochronous
Answer: Option A
43. When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
A. Stable
B. Unstable
C. Isochronous
D. None of these
Answer: Option B
44. Governor is used in automobile to
A. Decrease the variation of speed
B. Maximize the fuel economy
C. Limit the vehicle speed
D. Maintain constant engine speed
Answer: Option C
45. If the pressure angle is __________, a reciprocating follower will jam in its bearings.
A. Small
B. Too small
C. Large
D. Too large
Answer: Option D
Theory of Machines Questions and Answers Pdf
46. The Coriolis component of acceleration is taken into account for
A. Slider crank mechanism
B. Four bar chain mechanism
C. Quick return motion mechanism
D. All of these
Answer: Option C
47. Critical damping is a function of
A. Mass and stiffness
B. Mass and damping coefficient
C. Mass and natural frequency
D. Damping coefficient and natural frequency
Answer: Option A
48. Which of the following is a lower pair?
A. Ball and socket
B. Piston and cylinder
C. Cam and follower
D. Both (A) and (B) above
Answer: Option D
49. The D-slide valve is also known as
A. Inside admission valve
B. Outside admission valve
C. Piston slide valve
D. None of these
Answer: Option B
50. A circular bar moving in a round hole is an example of
A. Incompletely constrained motion
B. Partially constrained motion
C. Completely constrained motion
D. Successfully constrained motion
Answer: Option A
Theory of Machines Questions and Answers Pdf
51. A universal joint is an example of
A. Higher pair
B. Lower pair
C. Rolling pair
D. Sliding pair
Answer: Option B
52. An automobile steering gear is an example of
A. Sliding pair
B. Rolling pair
C. Lower pair
D. Higher pair
Answer: Option C
53. The cam and follower is an example of
A. Sliding pair
B. Rolling pair
C. Lower pair
D. Higher pair
Answer: Option D
54. The motion of a shaft in a circular hole is an example of
A. Completely constrained motion
B. Incompletely constrained motion
C. Successfully constrained motion
D. None of these
Answer: Option B
55. Which of the following is an open pair?
A. Ball and socket joint
B. Journal bearing
C. Lead screw and nut
D. Cam and follower
Answer: Option D
Theory of Machines Questions and Answers Pdf
56. In a kinematic chain, a quaternary joint is equivalent to
A. One binary joint
B. Two binary joints
C. Three binary joints
D. Four binary joints
Answer: Option C
57. The direction of Coriolis component of acceleration is the direction
A. Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
B. Along the centripetal acceleration
C. Along tangential acceleration
D. Along perpendicular to angular velocity
Answer: Option A
58. A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
A. a is +ve and b = 0
B. a = 0 and b is +ve
C. a is +ve and b is -ve
D. a is +ve and b is also +ve
Answer: Option A
60. A chain comprises of 5 links having 5 joints. Is it kinematic chain?
A. Yes
B. No
C. It is a marginal case
D. Data are insufficient to determine it
Answer: Option B
62. The maximum fluctuation of energy is the
A. Difference between the maximum and minimum energies
B. Sum of the maximum and minimum energies
C. Variations of energy above and below the mean resisting torque line
D. Ratio of the mean resisting torque to the work-done per cycle
Answer: Option A
Theory of Machines Questions and Answers Pdf
63. The Kutzbach criterion for determining the number of degrees of freedom (n) is (where = number of links, j = number of joints and h = number of higher pairs)
A. n = 3(l - 1) - 2j - h
B. n = 2(l - 1) - 2j - h
C. n = 3(l - 1) - 3j - h
D. n = 2(l - 1) - 3j - h
Answer: Option A
64. The example of lower pair is
A. Shaft revolving in a bearing
B. Straight line motion mechanisms
C. Automobile steering gear
D. All of the above
Answer: Option D
65. Which of the following is an example of sliding pair?
A. Piston and cylinder of a reciprocating steam engine
B. Shaft with collars at both ends fitted into a circular hole
C. Lead screw of a lathe with nut
D. Ball and a socket joint
Answer: Option A
Theory of Machines Questions and Answers Pdf
Why is the theory of machines important?
The theory of machines is an important area of study in engineering and science, as it provides the fundamental understanding of how machines work and how they can be designed and optimized for specific applications. Here are some reasons why the theory of machines is important:
Machine design: The theory of machines provides the foundational principles for designing machines that can perform specific functions. Engineers use this knowledge to design machines that are efficient, reliable, and safe.
Mechanical systems analysis: The theory of machines provides the tools for analyzing mechanical systems to understand their behavior and performance. This allows engineers to optimize systems for specific applications, such as increasing speed, improving accuracy, or reducing energy consumption.
Robotics: The theory of machines is essential for the design and control of robots, which are complex machines that can perform tasks autonomously. Engineers need to understand how robots move and interact with their environment to design robots that can perform specific tasks.
Manufacturing: The theory of machines is important for the design and optimization of manufacturing equipment. Understanding how machines work and how they can be improved can lead to more efficient and cost-effective manufacturing processes.
Overall, the theory of machines is a critical area of study for anyone interested in designing, building, or analyzing machines. It provides the foundational knowledge and tools necessary for creating effective and efficient machines that can be used in a wide range of applications.
What are the topics under theory of machine?
The theory of machines is a branch of mechanical engineering that deals with the study of the behavior and design of machines. Some of the topics that fall under the theory of machines include:
Kinematics: The study of motion and geometry without considering the forces that cause the motion.
Dynamics: The study of the forces that cause motion and the resulting motion of machines.
Mechanism Design: The study of designing and analyzing mechanisms that transform input motion and forces into desired output motion and forces.
Kinematic Analysis: The study of the motion of mechanisms without considering the forces that cause the motion.
Mechanism Synthesis: The process of designing a mechanism to satisfy a given set of performance specifications.
Cam Design: The design and analysis of cams, which are mechanical devices that convert rotational motion into reciprocating or oscillating motion.
Gear Design: The design and analysis of gears, which are mechanical devices that transmit power and motion between rotating shafts.
Vibration Analysis: The study of the oscillatory motion of machines and structures and their effects on performance and durability.
Control Theory: The study of controlling the behavior of machines, including feedback control, optimal control, and adaptive control.
Robotics: The study of designing and controlling robots, which are machines that can sense, think, and act autonomously or under human guidance.
What is concept of machine?
The concept of a machine generally refers to a device that is designed to perform a specific task or set of tasks using mechanical, electrical, or other types of power. Machines can be simple, like a lever or pulley, or complex, like a computer or a car. In general, machines are designed to make work easier by reducing the amount of physical or mental effort required to perform a task, or by increasing the speed, accuracy, or efficiency of the task.
Machines can be categorized into various types based on their function and mechanism. Some common types of machines include:
Simple machines - They include tools like levers, pulleys, inclined planes, wedges, and screws, which provide a mechanical advantage to make work easier.
Complex machines - They include devices like engines, turbines, computers, and robots, which are designed to perform more complex tasks with greater efficiency and accuracy.
Electrical machines - They include devices like motors, generators, transformers, and power electronics, which are based on electrical principles and are used to convert electrical energy into mechanical or other forms of energy.
The concept of machine has evolved over time with advancements in technology and engineering, and machines continue to play a critical role in various fields, from manufacturing and transportation to healthcare and communication.
What is kinematics and theory of machine?
Kinematics and theory of machines are two closely related branches of mechanical engineering that deal with the motion of machines and mechanisms.
Kinematics is the study of motion without considering the forces that cause it. It focuses on the description of motion, including position, velocity, and acceleration, without taking into account the forces that cause those motions. Kinematics is concerned with the geometry and the relative motion of bodies, rather than the forces that act on those bodies.
Theory of machines, on the other hand, is the study of the principles of machines and their applications. It involves the analysis and design of mechanisms that are used to transmit motion and force from one part of a machine to another. Theory of machines encompasses a wide range of topics, including the design and analysis of mechanisms, the study of machine elements such as gears and bearings, and the analysis of power transmission systems.
Both kinematics and theory of machines are essential for understanding the behavior of mechanical systems and designing machines that perform specific tasks. Kinematics is used to describe the motion of machine components, while theory of machines is used to design and optimize the mechanisms that produce that motion. Together, they provide the foundation for the design and analysis of complex mechanical systems.
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