1000+ Theory of Machines Multiple Choice Question Answer [Solved]
Thursday 9th of March 2023
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1. Which of the following statement is correct?
A. The power absorbed in operating the piston valve is less than D-slide valve
B. The wear of the piston valve is less than the wear of the D-slide valve
C. The D-slide valve is also called outside admission valve.
D. All of the above
Answer : D
A. The power absorbed in operating the piston valve is less than D-slide valve
B. The wear of the piston valve is less than the wear of the D-slide valve
C. The D-slide valve is also called outside admission valve.
D. All of the above
Answer : D
2. A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?
A. All points of the disc have the same velocity
B. The centre of the disc has zero acceleration
C. The centre of the disc has centrifugal acceleration
D. The point on the disc making contact with the plane surface has zero acceleration
Answer : B
A. All points of the disc have the same velocity
B. The centre of the disc has zero acceleration
C. The centre of the disc has centrifugal acceleration
D. The point on the disc making contact with the plane surface has zero acceleration
Answer : B
3. When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
A. Screw pair
B. Spherical pair
C. Turning pair
D. Sliding pair
Answer : A
A. Screw pair
B. Spherical pair
C. Turning pair
D. Sliding pair
Answer : A
4. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
A. (1/2). ? W cosec? (r? + r?)
B. (2/3). ? W cosec? (r? + r?)
C. (1/2). ? W cosec? [(r?³ - r?³)/(r?² - r?²)]
D. (2/3). ? W cosec? [(r?³ - r?³)/(r?² - r?²)]
Answer : D
A. (1/2). ? W cosec? (r? + r?)
B. (2/3). ? W cosec? (r? + r?)
C. (1/2). ? W cosec? [(r?³ - r?³)/(r?² - r?²)]
D. (2/3). ? W cosec? [(r?³ - r?³)/(r?² - r?²)]
Answer : D
5. Idler pulley is used
A. For changing the direction of motion of the belt
B. For applying tension
C. For increasing velocity ratio
D. All of the above
Answer : B
A. For changing the direction of motion of the belt
B. For applying tension
C. For increasing velocity ratio
D. All of the above
Answer : B
6. Which of the following is a lower pair?
A. Ball and socket i
B. Piston and cylinder
C. Cam and follower
D. Both (A) and (B) above
Answer : D
A. Ball and socket i
B. Piston and cylinder
C. Cam and follower
D. Both (A) and (B) above
Answer : D
7. The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
A. ?R cos?
B. ?(R - r?) cos?
C. ?(R - r?) sin?
D. ?r? sin?
Answer : C
A. ?R cos?
B. ?(R - r?) cos?
C. ?(R - r?) sin?
D. ?r? sin?
Answer : C
8. A governor is said to be stable, if the
A. Radius of rotation of balls increases as the equilibrium speed decreases
B. Radius of rotation of balls decreases as the equilibrium speed decreases
C. Radius of rotation of balls increases as the equilibrium speed increases
D. Radius of rotation of balls decreases as the equilibrium speed increases
Answer : C
A. Radius of rotation of balls increases as the equilibrium speed decreases
B. Radius of rotation of balls decreases as the equilibrium speed decreases
C. Radius of rotation of balls increases as the equilibrium speed increases
D. Radius of rotation of balls decreases as the equilibrium speed increases
Answer : C
9. The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ? = Angular velocity of the cam shaft)
A. ? (r? r?) sin?
B. ? (r? + r?) sin? sec2?
C. ? (r? r?) cos?
D. ? (r? + r?) cos? cosec2?
Answer : B
A. ? (r? r?) sin?
B. ? (r? + r?) sin? sec2?
C. ? (r? r?) cos?
D. ? (r? + r?) cos? cosec2?
Answer : B
10. The velocity of sliding __________ the distance of the point of contact from the pitch point.
A. Is directly proportional to
B. Is inversely proportional to
C. Is equal to cos ? multiplied by
D. Does not depend upon
Answer : A
A. Is directly proportional to
B. Is inversely proportional to
C. Is equal to cos ? multiplied by
D. Does not depend upon
Answer : A
11. 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 : C
A. Displacement diagram
B. Velocity diagram
C. Acceleration diagram
D. All of the above
Answer : C
12. Oldhams coupling is an inversion of the kinematic chain used in
A. Whitworth quick return mechanism
B. Elliptical trammels
C. Rotary engine
D. Universal joint
Answer : B
A. Whitworth quick return mechanism
B. Elliptical trammels
C. Rotary engine
D. Universal joint
Answer : B
13. In a screw jack, the effort required to lift the load W is given by (where ? = Helix angle, and ? = Angle of friction)
A. P = W tan(? - ?)
B. P = W tan(? + ?)
C. P = W tan(? - ?)
D. P = W cos(? + ?)
Answer : B
A. P = W tan(? - ?)
B. P = W tan(? + ?)
C. P = W tan(? - ?)
D. P = W cos(? + ?)
Answer : B
14. The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ?? rad/s in the clockwise direction and the link OB turns with angular velocity ?? rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
A. ??.??.r
B. (?? - ??)r
C. (?? + ??)r
D. (?? - ??)2r
Answer : B
A. ??.??.r
B. (?? - ??)r
C. (?? + ??)r
D. (?? - ??)2r
Answer : B
15. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on
A. A triangle
B. A point
C. Two lines
D. A straight line
Answer : D
A. A triangle
B. A point
C. Two lines
D. A straight line
Answer : D
16. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
A. To move the ship towards starboard
B. To move the ship towards port side
C. To raise the bow and lower the stern
D. To raise the stern and lower the bow
Answer : A
A. To move the ship towards starboard
B. To move the ship towards port side
C. To raise the bow and lower the stern
D. To raise the stern and lower the bow
Answer : A
17. The Ackermann steering mechanism is preferred to the Davis type in automobiles because
A. The former is mathematically accurate
B. The former is having turning pair
C. The former is most economical
D. The former is most rigid
Answer : B
A. The former is mathematically accurate
B. The former is having turning pair
C. The former is most economical
D. The former is most rigid
Answer : B
18. For dynamic balancing of a shaft
A. The net dynamic force acting on the shaft is equal to zero
B. The net couple due to the dynamic forces acting on the shaft is equal to zero
C. Both (A) and (B)
D. None of the above
Answer : C
A. The net dynamic force acting on the shaft is equal to zero
B. The net couple due to the dynamic forces acting on the shaft is equal to zero
C. Both (A) and (B)
D. None of the above
Answer : C
19. Cross head and guides form a
A. Lower pair
B. Higher pair
C. Turning pair
D. Sliding pair
Answer : D
A. Lower pair
B. Higher pair
C. Turning pair
D. Sliding pair
Answer : D
20. In a ball bearing, ball and bearing forms a
A. Turning pair
B. Rolling pair
C. Screw pair
D. Spherical pair
Answer : B
A. Turning pair
B. Rolling pair
C. Screw pair
D. Spherical pair
Answer : B
21. There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is
A. 1/24
B. 1/8
C. 4/15
D. 12
Answer : A
A. 1/24
B. 1/8
C. 4/15
D. 12
Answer : A
22. The main disadvantage of the sliding pair is that it is
A. Bulky
B. Wears rapidly
C. Difficult to manufacture
D. Both (A) and (B) above
Answer : D
A. Bulky
B. Wears rapidly
C. Difficult to manufacture
D. Both (A) and (B) above
Answer : D
23. The face of the tooth is the
A. Surface of the top of tooth
B. Surface of tooth above the pitch surface
C. Width of tooth below the pitch surface
D. Width of tooth measured along the pitch circle
Answer : B
A. Surface of the top of tooth
B. Surface of tooth above the pitch surface
C. Width of tooth below the pitch surface
D. Width of tooth measured along the pitch circle
Answer : B
24. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
A. Four times the first one
B. Same as the first one
C. One fourth of the first one
D. One and a half times the first one
Answer : C
A. Four times the first one
B. Same as the first one
C. One fourth of the first one
D. One and a half times the first one
Answer : C
25. The advantage of the piston valve over the slide valve is that in the former case
A. Wear is less
B. Power absorbed is less
C. Both wear and power absorbed are low
D. The pressure developed being high provides tight sealing
Answer : C
A. Wear is less
B. Power absorbed is less
C. Both wear and power absorbed are low
D. The pressure developed being high provides tight sealing
Answer : C
26. The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r? and r? = External and internal radii of collar respectively)
A. (1/2) ? W (r? + r?)
B. (2/3) ? W (r? + r?)
C. (1/2) ? W [(r?³ - r?³)/(r?² - r?²)]
D. (2/3) ? W [(r?³ - r?³)/(r?² - r?²)]
Answer : A
A. (1/2) ? W (r? + r?)
B. (2/3) ? W (r? + r?)
C. (1/2) ? W [(r?³ - r?³)/(r?² - r?²)]
D. (2/3) ? W [(r?³ - r?³)/(r?² - r?²)]
Answer : A
27. A spring controlled governor is said to be unstable when the controlling force
A. Increases as the radius of rotation decreases
B. Increases as the radius of rotation increases
C. Decreases as the radius of rotation increases
D. Remains constant for all radii of rotation
Answer : C
A. Increases as the radius of rotation decreases
B. Increases as the radius of rotation increases
C. Decreases as the radius of rotation increases
D. Remains constant for all radii of rotation
Answer : C
28. Which is the false statement about the properties of instantaneous centre?
A. At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
B. The two rigid links have no linear velocities relative to each other at the instantaneous centre
C. The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
D. The double centre can be denoted either by O2 or O12, but proper selection should be made
Answer : D
A. At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
B. The two rigid links have no linear velocities relative to each other at the instantaneous centre
C. The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
D. The double centre can be denoted either by O2 or O12, but proper selection should be made
Answer : D
29. The ratio of maximum fluctuation of energy to the workdone per cycle is called
A. Fluctuation of energy
B. Maximum fluctuation of energy
C. Coefficient of fluctuation of energy
D. None of these
Answer : C
A. Fluctuation of energy
B. Maximum fluctuation of energy
C. Coefficient of fluctuation of energy
D. None of these
Answer : C
30. The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because
A. Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
B. The Ackerman steering gear consists of turning pairs
C. The Ackerman steering gear is most economical
D. Both (A) and (B)
Answer : D
A. Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
B. The Ackerman steering gear consists of turning pairs
C. The Ackerman steering gear is most economical
D. Both (A) and (B)
Answer : D
31. A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become
A. tp /16
B. tp /4
C. 4 tp
D. 16 tp
Answer : B
A. tp /16
B. tp /4
C. 4 tp
D. 16 tp
Answer : B
32. The velocity of the rubbing surface __________ with the distance from the axis of the bearing.
A. Increases
B. Decreases
C. Remain same
D. None of these
Answer : A
A. Increases
B. Decreases
C. Remain same
D. None of these
Answer : A
33. Sensitiveness of the governor is defined as the ratio of the
A. Mean speed to the maximum equilibrium speed
B. Mean speed to the minimum equilibrium speed
C. Difference of the maximum and minimum equilibrium speeds to the mean speed
D. Sum of the maximum and minimum equilibrium speeds to the mean speed
Answer : C
A. Mean speed to the maximum equilibrium speed
B. Mean speed to the minimum equilibrium speed
C. Difference of the maximum and minimum equilibrium speeds to the mean speed
D. Sum of the maximum and minimum equilibrium speeds to the mean speed
Answer : C
34. The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan ? = Coefficient of friction between the shaft and bearing)
A. r sin?
B. r cos?
C. r tan?
D. (r/2) cos?
Answer : A
A. r sin?
B. r cos?
C. r tan?
D. (r/2) cos?
Answer : A
35. When the sleeve of a Porter governor moves downwards, the governor speed
A. Increases
B. Decreases
C. Remain unaffected
D. First increases and then decreases
Answer : B
A. Increases
B. Decreases
C. Remain unaffected
D. First increases and then decreases
Answer : B
36. 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 : B
A. 95 mm
B. Slightly less than 95 mm
C. Slightly more than 95 mm
D. 45 mm
Answer : B
37. Ball and a Socket forms a
A. Turning pair
B. Rolling pair
C. Screw pair
D. Spherical pair
Answer : D
A. Turning pair
B. Rolling pair
C. Screw pair
D. Spherical pair
Answer : D
38. In vibration isolation system, if ?/?n < 2, then for all values of damping factor, the transmissibility will be (where ? = Angular speed of the system, ?n = Natural frequency of vibration of the system)
A. Less than unity
B. Equal to unity
C. Greater than unity
D. Zero
Answer : C
A. Less than unity
B. Equal to unity
C. Greater than unity
D. Zero
Answer : C
39. A slider crank chain consists of following numbers of turning and sliding pairs
A. 1, 3
B. 2, 2
C. 3, 1
D. 4, 0
Answer : C
A. 1, 3
B. 2, 2
C. 3, 1
D. 4, 0
Answer : C
40. Ackermann steering gear consists of
A. Sliding pairs
B. Turning pairs
C. Rolling pairs
D. Higher pairs
Answer : B
A. Sliding pairs
B. Turning pairs
C. Rolling pairs
D. Higher pairs
Answer : B
41. If ?/?n is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
A. 0°
B. 90°
C. 180°
D. 360°
Answer : A
A. 0°
B. 90°
C. 180°
D. 360°
Answer : A
42. With usual notations for different parameters involved, the maximum fluctuations of energy for a flywheel is given by
A. 2ECS
B. ECS/2
C. 2ECS²
D. 2E²CS
Answer : A
A. 2ECS
B. ECS/2
C. 2ECS²
D. 2E²CS
Answer : A
43. A torsional system with discs of moment of inertia I? and I? as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to 
A. G.I?
B. G².I?
C. I?/G
D. I?/G²
Answer : B
A. G.I?
B. G².I?
C. I?/G
D. I?/G²
Answer : B
44. A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is
A. Kinematically sound
B. Not sound
C. Soundness would depend upon which link is kept fixed
D. Data is not sufficient to determine same
Answer : A
A. Kinematically sound
B. Not sound
C. Soundness would depend upon which link is kept fixed
D. Data is not sufficient to determine same
Answer : A
45. For high speed engines, the cam follower should move with
A. Uniform velocity
B. Simple harmonic motion
C. Uniform acceleration and retardation
D. Cycloidal motion
Answer : D
A. Uniform velocity
B. Simple harmonic motion
C. Uniform acceleration and retardation
D. Cycloidal motion
Answer : D
46. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
A. Lower pair
B. Higher pair
C. Self-closed pair
D. Force-closed pair
Answer : A
A. Lower pair
B. Higher pair
C. Self-closed pair
D. Force-closed pair
Answer : A
47. The condition for correct steering of a Davis steering gear is (where ? = Angle of inclination of the links to the vertical)
A. sin? = b/c
B. cos? = c/b
C. tan? = c/2b
D. cot? = c/2b
Answer : C
A. sin? = b/c
B. cos? = c/b
C. tan? = c/2b
D. cot? = c/2b
Answer : C
48. A rigid body possesses ________degrees of freedom
A. One
B. Two
C. Four
D. Six
Answer : D
A. One
B. Two
C. Four
D. Six
Answer : D
49. The coriolis component of acceleration leads the sliding velocity by
A. 45°
B. 90°
C. 135°
D. 180°
Answer : B
A. 45°
B. 90°
C. 135°
D. 180°
Answer : B
50. The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line
A. Joining the corresponding points
B. Perpendicular to line as per (A)
C. Not possible to determine with these data
D. At 45° to line as per (A)
Answer : A
A. Joining the corresponding points
B. Perpendicular to line as per (A)
C. Not possible to determine with these data
D. At 45° to line as per (A)
Answer : A
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