Q.1

The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

  • Correct
  • Incorrect
Q.2

When the two elements of a pair have __________ when in motion, it is said to a lower pair.

  • line or point contact
  • surface contact
Q.3

When a slider moves on a fixed link having curved surface, their instantaneous centre lies

  • on their point of contact
  • at the centre of curvature
  • at the centre of circle
  • at the pin joint
Q.4

The working depth of a gear is the radial distance from the

  • pitch circle to the bottom of a tooth
  • pitch circle to the top of a tooth
  • top of a tooth to the bottom of a tooth
  • addendum circle to the clearance circle
Q.5

A system in dynamic balance implies that

  • the system is critically damped
  • there is no critical speed in the system
  • the system is also statically balanced
  • there will absolutely no wear of bearings
Q.6

The ratio of the number of teeth to the pitch circle diameter in millimetres, is called

  • circular pitch
  • diametral pitch
  • module
  • none of these
Q.7

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

  • simple pendulum
  • compound pendulum
  • torsional pendulum
  • second's pendulum
Q.8

Scotch yoke mechanism is used to generate

  • sine functions
  • square roots
  • logarithms
  • inversions
Q.9

The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

  • opposite to each other
  • parallel to each other
  • perpendicular to each other
  • inclined at 45°
Q.10

The size of a gear is usually specified by

  • pressure angle
  • circular pitch
  • diametral pitch
  • pitch circle diameter
Q.11

The example of completely constrained motion is a

  • motion of a piston in the cylinder of a steam engine
  • motion of a square bar in a square hole
  • motion of a shaft with collars at each end in a circular hole
  • all of the above
Q.12

The ratio of the pitch circle diameter in millimetres to the number of teeth, is called circular pitch.

  • Yes
  • No
Q.13

Longitudinal vibrations are said to occur when the particles of a body moves

  • perpendicular to its axis
  • parallel to its axis
  • in a circle about its axis
  • none of these
Q.14

In a mechanism, the fixed instantaneous centres are those centres which

  • remain in the same place for all configurations of the mechanism
  • vary with the configuration of the mechanism
  • moves as the mechanism moves, but joints are of permanent nature
  • none of the above
Q.15

Which of the following statement is correct for gears ?

  • The addendum is less than the dedendum
  • The pitch circle diameter is the product of module and number of teeth
  • The contact ratio means the number of pairs of teeth in contact
  • all of the above
Q.16

The size of a gear is usually specified by

  • pressure angle
  • circular pitch
  • diametral pitch
  • pitch circle diameter
Q.17

The unbalanced primary forces in a reciprocating engine are

  • balanced completely
  • balanced partially
  • balanced by secondary forces
  • not balanced
Q.18

When the axes of the first and last wheels are co-axial, then the train is known as

  • simple train of wheels
  • compound train of wheels
  • reverted gear train
  • epicyclic gear train
Q.19

Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

  • D-slide valve
  • Governor
  • Flywheel
  • Meyer's expansion valve
Q.20

The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.

  • greater than
  • less than
Q.21

The swaying couple is due to the

  • primary unbalanced force
  • secondary unbalanced force
  • two cylinders of locomotive
  • partial balancing
Q.22

The example of successfully constrained motion is a

  • motion of an I.C. engine valve
  • motion of the shaft between a foot-step bearing
  • piston reciprocating inside an engine cylinder
  • all of the above
Q.23

The danger of breakage and vibration is maximum

  • below the critical speed
  • near the critical speed
  • above the critical speed
  • none of these
Q.24

In involute gears, the pressure angle is

  • dependent on the size of teeth
  • dependent on the size of gears
  • always constant
  • always variable
Q.25

Most of the engines, generally, do not require balancing of secondary forces and couples.

  • Right
  • Wrong
Q.26

The rotating shafts tend to vibrate violently at whirling speeds because

  • the system is unbalanced
  • bearing centre line coincides with the axis
  • the shafts are rotating at very high speeds
  • resonance is caused due to the heavy mass of the rotor
Q.27

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

  • ω(r1 - r2)sin θ
  • ω(r1 + r2)sinθ sec2θ
  • ω(r1 - r2)cos θ
  • ω(r1 + r2)cos θ cosec2 θ
Q.28

Which of the following statements regarding laws governing the friction between dry surfaces are correct?

  • The friction force is dependent on the materials of the contact surfaces.
  • The friction force is directly proportional to the normal force.
  • The friction force is independent of me area of contact.
  • all of the above
Q.29

The minimum number of teeth on the pinion which will mesh with any gear without interference forfull depth involute teeth will be

  • 12
  • 14
  • 18
  • 24
Q.30

The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

  • a single plane
  • two planes
  • three planes
  • four planes
Q.31

Which of the following statement is correct?

  • The power absorbed in operating the piston valve is less than D-slide valve.
  • The wear of the piston valve is less than the wear of the D-slide valve.
  • The D-slide valve is also called outside admission valve.
  • all of the above
Q.32

In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

  • because of difficulty in manufacturing cam profile
  • because of loose contact of follower with cam surface
  • in order to have acceleration in beginning and retardation at the end of stroke within the finite limits
  • because the uniform velocity motion is a partial parabolic motion
Q.33

The primary unbalanced force is more than the secondary unbalanced force.

  • True
  • False
Q.34

The cam and follower is an example of

  • sliding pair
  • rolling pair
  • lower pair
  • higher pair
Q.35

The ratio of driving tensions for rope drive is same as that of V-belt drive.

  • Yes
  • No
Q.36

For static balancing of a shaft, the net dynamic force acting on the shaft is equal to zero.

  • Agree
  • Disagree
Q.37

The lead screw of a lathe with nut forms a

  • rolling pair
  • sliding pair
  • screw pair
  • turning pair
Q.38

The angle which the normal reaction makes with the resultant reaction is called angle of friction.

  • Agree
  • Disagree
Q.39

If the damping factor for a vibrating system is unity, then the system will be

  • over damped
  • under damped
  • critically damped
  • without vibrations
Q.40

A shaft carrying three rotors will have

  • no node
  • one node
  • two nodes
  • three nodes
Q.41

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

  • two times
  • four times
  • eight times
  • sixteen times
Q.42

Which of the following is an inversion of a double slider crank chain?

  • Oldham's coupling
  • Elliptical trammel
  • Scotch yoke mechanism
  • all of these
Q.43

The sensitiveness of the governor __________ as the speed range decreases.

  • remains unaffected
  • decreases
  • increases
Q.44

In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

  • 50° - 60°
  • 60° - 70°
  • 70° - 80°
  • 80° - 90°
Q.45

In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

  • P = W tan(α - φ)
  • P = W tan(α + φ)
  • P = W tan(φ - α)
  • P = W cos(α + φ)
Q.46

If the damping factor for a vibrating system is unity, then the system will be

  • over damped
  • under damped
  • critically damped
  • without vibrations
Q.47

The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

  • less
  • more
  • same
Q.48

The contact ratio for gears is

  • zero
  • less than one
  • greater than one
  • infinity
Q.49

A Hartnell governor is a

  • dead weight governor
  • pendulum type governor
  • spring loaded governor
  • inertia governor
Q.50

A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar.

  • Agree
  • Disagree
0 h : 0 m : 1 s