Q.1

The motion of a shaft in a circular hole is an example of

  • completely constrained motion
  • incompletely constrained motion
  • successfully constrained motion
  • none of these
Q.2

A shaft of mass (mc)and stiffness (s) is fixed at one end and carries a mass (m) at the other end. The natural frequency of its transverse vibration is same as for longitudinal vibration.

  • Yes
  • No
Q.3

The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

  • increases
  • decreases
Q.4

The unbalanced force due to reciprocating 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.5

Pitch point of a cam is

  • a point on the pitch curve having minimum pressure angle
  • a point on the pitch curve having maximum pressure angle
  • any point on the pitch curve
  • any point on the pitch circle
Q.6

A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

  • ωv
  • 2 ωv
  • ω2v
  • 2 ωv2
Q.7

When a body is subjected to longitudinal vibrations, the stress induced in a body will be tensile or compressive stress.

  • Correct
  • Incorrect
Q.8

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

  • radial component
  • tangential component
  • coriolis component
  • none of these
Q.9

When the connection between the elements forming a pair is such that the constrained motion is not completed by itself, but by some other means, the motion is said to be a completely constrained motion,

  • Yes
  • No
Q.10

Which of the following mechanism is an approximate straight line motion mechanism?

  • Watt's mechanism
  • Grasshopper mechanism
  • Robert's mechanism
  • all of these
Q.11

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

  • radial component
  • tangential component
  • coriolis component
  • none of these
Q.12

In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

  • minimise the effect of primary forces
  • minimise the effect of secondary forces
  • have perfect balancing
  • to start the locomotive quickly
Q.13

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

  • screw pair
  • spherical pair
  • turning pair
  • sliding pair
Q.14

Which of the following statement is correct as regard to the difference between a machine and a structure?

  • The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
  • The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
  • A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
  • all of the above
Q.15

When the connection between the elements forming a pair is such that the constrained motion is not completed by itself, but by some other means, the motion is said to be a completely constrained motion,

  • Yes
  • No
Q.16

An overdamped system, when disturbed from the equilibrium position, will not cross the equilibrium position.

  • Right
  • Wrong
Q.17

The load cup of a screw jack is made separate from the head of the spindle to

  • enhance the load carrying capacity of the jack
  • reduce the effort needed for lifting the working load
  • reduce the value of frictional torque required to be countered for lifting the load
  • prevent the rotation of load being lifted
Q.18

The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

  • ω2R cos θ
  • ω2(R - r1)cos θ
  • ω2(R - r1)sin θ
  • ω2r1 sin θ
Q.19

The secondary unbalanced force is __________ the primary unbalanced force.

  • one-half
  • two-third
  • n times
  • 1/n times
Q.20

The sensitiveness of a governor depends upon the lift of the sleeve.

  • Right
  • Wrong
Q.21

The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is

  • μ W cosec α (r1 + r2)
  • μ W cosec α (r1 + r2)
  • μ W cosec α
  • μ W cosec α
Q.22

A fixed gear havingteeth is in mesh with another gear havingteeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

  • 2
  • 3
  • 4
  • 5
Q.23

A rotary internal combustion engine has __________ cylinders.

  • four
  • five
  • six
  • seven
Q.24

The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.

  • True
  • False
Q.25

A fixed gear havingteeth is in mesh with another gear havingteeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

  • 2
  • 3
  • 4
  • 5
Q.26

In gears, interference takes place when

  • the tip of a tooth of a mating gear digs into the portion between base and root circles
  • gears do not move smoothly in the absence of lubrication
  • pitch of the gears is not same
  • gear teeth are undercut
Q.27

A shaft carrying two rotors at its ends will have

  • no node
  • one node
  • two nodes
  • three nodes
Q.28

The ball and socket joint is an example of screw pair.

  • Agree
  • Disagree
Q.29

In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as

  • tractive force
  • swaying couple
  • hammer blow
  • none of these
Q.30

The coriolis component of acceleration depends upon

  • velocity of slider
  • angular velocity of the link
  • both (a) and (b)
  • none of these
Q.31

The efficiency of a screw jack is dependent upon the load raised or lowered.

  • True
  • False
Q.32

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force

  • the reaction on me inner wheels increases and on the outer wheels decreases
  • the reaction on the outer wheels increases and on the inner wheels decreases
  • the reaction on the front wheels increases and on the rear wheels decreases
  • the reaction on the rear wheels increases and on the front wheels decreases
Q.33

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force

  • the reaction on me inner wheels increases and on the outer wheels decreases
  • the reaction on the outer wheels increases and on the inner wheels decreases
  • the reaction on the front wheels increases and on the rear wheels decreases
  • the reaction on the rear wheels increases and on the front wheels decreases
Q.34

In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.

  • No
  • Yes
Q.35

In an open pair, the two elements of a pair

  • have a surface contact when in motion
  • have a line or point contact when in motion
  • are kept in contact by the action of external forces, when in motion
  • are not held together mechanically
Q.36

The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

  • 0
  • 1
  • 2
  • -1
Q.37

The motion of a shaft in a circular hole is an example of

  • completely constrained motion
  • incompletely constrained motion
  • successfully constrained motion
  • none of these
Q.38

The equation of motion for a vibrating system with viscous damping is
,
if the roots of the equation are __________ then the system will be under damped.

  • equal
  • real
  • complex conjugate
Q.39

The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

  • whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
  • the Ackerman steering gear consists of turning pairs
  • the Ackerman steering gear is most economical
  • both (a) and (b)
Q.40

The ratio of maximum fluctuation of energy to the workdone per cycle is called

  • fluctuation of energy
  • maximum fluctuation of energy
  • coefficient of fluctuation of energy
  • none of these
Q.41

A spring controlled governor is said to be isochronous when the controlling force

  • increases as the radius of rotation decreases
  • increases as the radius of rotation increases
  • decreases as the radius of rotation increases
  • remains constant for all radii of rotation
Q.42

In a reciprocating steam engine, which of the following forms a kinematic link?

  • Cylinder and piston
  • Piston rod and connecting rod
  • Crankshaft and flywheel
  • Flywheel and engine frame
Q.43

The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

  • to dip the nose and tail
  • to raise the nose and tail
  • to raise the nose and dip the tail
  • to dip the nose and raise the tail
Q.44

In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

  • open belt drive is recommended
  • crossed belt drive is recommended
  • both open belt drive and crossed belt drive is recommended
  • the drive is recommended depending upon the torque transmitted
Q.45

The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at

  • the centre of the disc
  • the point of contact
  • an infinite distance on the plane surface
  • the point on the circumference situated vertically opposite to the contact point
Q.46

The power transmitted by a belt is maximum when the maximum tension in the belt is __________ of centrifugal tension.

  • one-third
  • two-third
  • double
  • three times
Q.47

The ratio of maximum fluctuation of speed to the mean speed is called

  • fluctuation of speed
  • maximum fluctuation of speed
  • coefficient of fluctuation of speed
  • none of these
Q.48

When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

  • return to equilibriumposition without oscillation
  • oscillate with increasing time period
  • oscillate with decreasing amplitude
  • oscillate with constant amplitude
Q.49

In a reciprocating steam engine, which of the following forms a kinematic link?

  • Cylinder and piston
  • Piston rod and connecting rod
  • Crankshaft and flywheel
  • Flywheel and engine frame
Q.50

The brake commonly used in motor cars is internal expanding brake.

  • True
  • False
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