Q.1

A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the centre of the circle.

  • Agree
  • Disagree
Q.2

Which of the following statement is correct?

  • The primary unbalanced force is less than the secondary unbalanced force.
  • The primary unbalanced force is maximum twice in one revolution of the crank.
  • The unbalanced force due to reciprocating masses varies in magnitude and direction both.
  • The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines
Q.3

In a steam engine, the link constitutes a

  • piston, piston rod and crosshead
  • connecting rod with big and small end brasses, caps and bolts
  • crank pin, crankshaft and flywheel
  • all of the above
Q.4

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

  • Pendulum pump
  • Oscillating cylinder engine
  • Rotary internal combustion engine
  • all of these
Q.5

The uniform pressure theory gives a higher frictional torque than the uniform wear theory.

  • Agree
  • Disagree
Q.6

The product of the diametral pitch and circular pitch is equal to

  • 1
  • 1/π
  • π
  • 2 π
Q.7

When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions.

  • Right
  • Wrong
Q.8

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

  • four times the first one
  • same as the first one
  • one fourth of the first one
  • one and a half times the first one
Q.9

According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

  • straight line
  • parabolic curve
  • triangle
  • rectangle
Q.10

The magnitude of velocities of the points on a rigid link is

  • directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre
  • directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre
  • inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre
  • inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre
Q.11

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

  • four times the first one
  • same as the first one
  • one fourth of the first one
  • one and a half times the first one
Q.12

The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

  • 0° and 90°
  • 180° and 360°
  • both (a) and (b)
  • none of these
Q.13

A very sensitive governor will cause hunting.

  • True
  • False
Q.14

The centrifugal tension on the belt has no effect on the power transmitted.

  • Correct
  • Incorrect
Q.15

The coriolis component of acceleration is taken into account for

  • slider crank mechanism
  • four bar chain mechanism
  • quick return motion mechanism
  • all of these
Q.16

A mechanism consisting of four links is called a __________ mechanism.

  • simple
  • compound
Q.17

Whitworth quick return motion mechanism is an inversion of a double slider crank chain.

  • Correct
  • Incorrect
Q.18

A railway bridge is an example of a machine.

  • True
  • False
Q.19

The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

  • n = (l - 1) - j
  • n = 2(l - 1) - 2j
  • n = 3(l - 1) - 2j
  • n = 4(l - 1) - 3j
Q.20

The tangential component of acceleration of the slider with respect to the coincident point on the link is called coriolis component of acceleration.

  • Agree
  • Disagree
Q.21

A pendulum type governor is a Watt governor.

  • Agree
  • Disagree
Q.22

In a kinematic chain, a quaternary joint is equivalent to

  • one binary joint
  • two binary joints
  • three binary joints
  • four binary joints
Q.23

In a radial cam, the follower moves

  • in a direction perpendicular to the cam axis
  • in a direction parallel to the cam axis
  • in any direction irrespective of the cam axis
  • along the cam axis
Q.24

Which of the following is a turning pair?

  • Piston and cylinder of a reciprocating steam engine
  • Shaft with collars at both ends fitted into a circular hole
  • Lead screw of a lathe with nut
  • Ball and a socket joint
Q.25

The Klein's diagram is used when

  • crank has uniform angular velocity
  • crank has non-uniform angular velocity
  • crank has uniform angular accleration
  • crank has non-uniform angular acceleration
Q.26

The train value of a gear train is

  • equal to velocity ratio of a gear train
  • reciprocal of velocity ratio of a gear train
  • always greater than unity
  • always less than unity
Q.27

The velocity of a body moving with simple harmonic motion is __________ at the mean position.

  • zero
  • minimum
  • maximum
Q.28

The flank of the tooth is the surface of the tooth __________ the pitch surface.

  • above
  • below
Q.29

The natural frequency of free transverse vibrations is same as that of free longitudinal vibrations.

  • Right
  • Wrong
Q.30

The amplitude of vibration is always __________ the radius of the circle.

  • equal to
  • less than
  • greater than
Q.31

The maximum gyroscopic couple acting on the ship tends to shear the holding down bolts.

  • Correct
  • Incorrect
Q.32

Scott Russell's mechanism is made up of sliding pair.

  • Correct
  • Incorrect
Q.33

Torsional 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.34

In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

  • less sensitive
  • more sensitive
  • unaffected of sensitivity
  • isochronous
Q.35

The periodic time is given by (where ω = Angular velocity of the particle in rad/s)

  • ω/2π
  • 2π/ω
  • ω x 2π
  • π/ω
Q.36

Torsional 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.37

In a single slider crank chain

  • each of the four pairs is a turning pair
  • one is a turning pair and three are sliding pairs
  • two are turning pairs and two are sliding pairs
  • three are turning pairs and one is a sliding pair
Q.38

For dynamic balancing of a shaft

  • the net dynamic force acting on the shaft is equal to zero
  • the net couple due to the dynamic forces acting on the shaft is equal to zero
  • both (a) and (b)
  • none of the above
Q.39

The piston slide valve is an inside admission valve.

  • Yes
  • No
Q.40

In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

  • depends upon
  • is independent of
Q.41

When the primary direct crank of a reciprocating engine makes an angle of θ with the line of stroke, then the secondary direct crank will make an angle of __________ with the line of stroke.

  • θ/2
  • θ
  • 2 θ
  • 4 θ
Q.42

The driving and driven shafts connected by a Hooke's joint will have equal speeds, if

  • cos θ = sin α
  • sin θ = ±tan α
  • tan θ = ±cos α
  • cot θ = cos α
Q.43

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 2 L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

  • remain same as before
  • become equal to 2 R
  • become equal to R/2
  • become equal to R/4
Q.44

The throw of the eccentric is equal to the valve travel.

  • Correct
  • Incorrect
Q.45

The direction of linear velocity of any point on a link with respect to another point on the same link is

  • parallel to the link joining the points
  • perpendicular to the link joining the points
  • at 45° to the link joining the points
  • none of the above
Q.46

An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

  • tip of the gear tooth and flank of pinion
  • tip of the pinion and flank of gear
  • flanks of both gear and pinion
  • tip of both gear and pinion
Q.47

In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver.

  • Yes
  • No
Q.48

In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

  • reduce vibration
  • reduce slip
  • ensure uniform loading
  • ensure proper alignment
Q.49

Which of the following is an example of a higher pair ?

  • Toothed gearing
  • Belt and rope drive
  • Ball and roller bearing
  • all of these
Q.50

A body is said to vibrate with simple harmonic motion if its acceleration is proportional to the distance from the mean position.

  • Yes
  • No
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