Q.1

Which one of the following can completely balance several masses revolving in different planes on a shaft?

  • A single mass in different planes
  • Two masses in any two planes
  • A single mass in one of the planes of the revolving masses
  • Two equal masses in any two planes
Q.2

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

  • governor A is more sensitive than governor B
  • governor B is more sensitive than governor A
  • both governors A and B are equally sensitive
  • none of the above
Q.3

In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

  • less than unity
  • equal to unity
  • greater than unity
  • zero
Q.4

The minimum force required to slide a body of weight W on a rough horizontal plane is

  • W sin θ
  • W cos θ
  • W tan θ
  • W cosec θ
Q.5

A spring controlled governor is found unstable. It can be made stable by

  • increasing the spring stiffness
  • decreasing the spring stiffness
  • increasing the ball mass
  • decreasing the ball mass
Q.6

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

  • governor A is more sensitive than governor B
  • governor B is more sensitive than governor A
  • both governors A and B are equally sensitive
  • none of the above
Q.7

The unbalanced force due to revolving masses

  • varies in magnitude but constant in direction
  • varies in direction but constant in magnitude
  • varies in magnitude and direction both
  • constant in magnitude and direction both
Q.8

A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

  • structure
  • mechanism
  • kinematic chain
  • inversion
Q.9

In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at

  • 45° to each other
  • 90° to each other
  • 120° to each other
  • 180° to each other
Q.10

A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

  • structure
  • mechanism
  • kinematic chain
  • inversion
Q.11

Critical damping is a function of

  • mass and stiffness
  • mass and damping coefficient
  • mass and natural frequency
  • damping coefficient and natural frequency
Q.12

In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the angle of advance of the eccentric but reducing the throw of the eccentric and keeping the steam lap and exhaust lap constant. This method will cause withdrawing or throttling of steam.

  • Agree
  • Disagree
Q.13

Frequency of vibrations is usually expressed in

  • number of cycles per hour
  • number of cycles per minute
  • number of cycles per second
  • none of these
Q.14

Critical damping is a function of

  • mass and stiffness
  • mass and damping coefficient
  • mass and natural frequency
  • damping coefficient and natural frequency
Q.15

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

  • to raise the bow and stern
  • to lower the bow and stern
  • to raise the bow and lower the stern
  • to raise the stern and lower the bow
Q.16

The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.

  • Right
  • Wrong
Q.17

The component of the acceleration, parallel to the velocity of the particle, at the given instant is called

  • radial component
  • tangential component
  • coriolis component
  • none of these
Q.18

When a point at the end of a link moves with constant angular velocity, its acceleration will have

  • radial component only
  • tangential component only
  • coriolis component only
  • radial and tangential components both
Q.19

In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley.

  • True
  • False
Q.20

The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.

  • Right
  • Wrong
Q.21

A link or element need not to be a rigid body, but it must be a resistant body.

  • Agree
  • Disagree
Q.22

The coriolis component of acceleration leads the sliding velocity by

  • 45°
  • 90°
  • 135°
  • 180°
Q.23

A governor is said to be stable, if the

  • radius of rotation of balls increases as the equilibrium speed decreases
  • radius of rotation of balls decreases as the equilibrium speed decreases
  • radius of rotation of balls increases as the equilibrium speed increases
  • radius of rotation of balls decreases as the equilibrium speed increases
Q.24

The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

  • l = 2p - 2
  • l = 2p - 3
  • l = 2p - 4
  • l = 2p - 5
Q.25

In forced vibrations, the magnitude of damping force at resonance is equal to the impressed force.

  • Correct
  • Incorrect
Q.26

In a multiple V-belt drive, if one of the belt is broken, then we should replace

  • the broken belt only
  • all the belts
  • the broken belt and the belts on either side of it
  • none of the above
Q.27

The time taken by a particle for one complete oscillationis known as periodic time.

  • Agree
  • Disagree
Q.28

In order to double the period of a simple pendulum, the length of the string should be

  • halved
  • doubled
  • quadrupled
  • none of these
Q.29

A Porter governor can not be isochronous.

  • Agree
  • Disagree
Q.30

In a Proell governor, the balls are attached to the extension of lower links.

  • True
  • False
Q.31

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

  • to raise the bow and stern
  • to lower the bow and stern
  • to raise the bow and lower the stern
  • to raise the stern and lower the bow
Q.32

A Porter governor can not be isochronous.

  • Agree
  • Disagree
Q.33

The maximum and minimum value of the tractive force is given by

  • ± c.m x ω2.r
  • ± 2 x c.m.ω2.r
  • ± 2(1 - c)m x ω2.r
  • ± 2 x c.m x ω2.r
Q.34

The module is the reciprocal of diametral pitch.

  • True
  • False
Q.35

A body will begin to move down an inclined plane, if the angle of inclination of the plane is __________ the angle of friction.

  • equal to
  • less than
  • greater than
Q.36

Which of the following statement is correct ?

  • The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.
  • The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.
  • The velocity of a particle moving with simple harmonic motion is zero at the mean position.
  • The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.
Q.37

The inversion of a mechanism is

  • changing of a higher pair to a lower pair
  • turning its upside down
  • obtained by fixing different links in a kinematic chain
  • obtained by reversing the input and output motion
Q.38

In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

  • fluctuation of energy
  • maximum fluctuation of energy
  • coefficient of fluctuation of energy
  • none of these
Q.39

If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be

  • stable
  • unstable
  • isochronous
  • none of these
Q.40

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

  • stable
  • unstable
  • isochronous
  • hunt
Q.41

The coefficient of fluctuation of energy is the ratio of maximum energy to the minimum energy.

  • True
  • False
Q.42

In a shaper mechanism, the coriolis component of acceleration does not exist.

  • True
  • False
Q.43

A reed type tachometer use the principle of

  • longitudinal vibration
  • torsional vibration
  • transverse vibration
  • damped free vibration
Q.44

Which of the following is a higher pair?

  • Belt and pulley
  • Turning pair
  • Screw pair
  • Sliding pair
Q.45

The primary unbalanced force is maximum __________ in one revolution of the crank.

  • twice
  • four times
  • eight times
  • sixteen times
Q.46

The displacement of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r1 = Minimum radius of the cam, and θ = Angle turned through by the cam)

  • R(1 - cos θ)
  • (R - r1)(1 - cos θ)
  • R(1 - sin θ)
  • (R - r1)(1 - sin θ)
Q.47

When the sleeve of a Porter governor moves downwards, the governor speed

  • increases
  • decreases
  • remains unaffected
  • first increases and then decreases
Q.48

In a spring controlled governor, when the controlling force __________ as the radius of rotation increases, it is said to be a stable governor.

  • remains constant
  • decreases
  • increases
Q.49

The height of a Watt's governor is

  • directly proportional to speed
  • directly proportional to (speed)2
  • inversely proportional to speed
  • inversely proportional to (speed)2
Q.50

When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the __________ pulley must be taken into consideration.

  • smaller
  • larger
0 h : 0 m : 1 s