Q.1

The included angle for the V-belt is usually

  • 10° to 20°
  • 20° to 30°
  • 30° to 40°
  • 60° to 80°
Q.2

When two links are connected by a pin joint, their instantaneous centre lies

  • on their point of contact
  • at the centre of curvature
  • at the centre of circle
  • at the pin joint
Q.3

The mechanism consisting of three turning pairs and one sliding pair, is called a

  • single slider crank chain
  • Whitworth quick return motion mechanism
  • crank and slotted lever quick return motion mechanism
  • all of the above
Q.4

The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

  • same
  • different
Q.5

The two elements of a pair are said to form a higher pair, when they

  • 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
  • permit relative motion
Q.6

V-belts are usually used for

  • long drives
  • short drives
  • long and short drives
  • none of these
Q.7

The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

  • parallel
  • perpendicular
Q.8

When no external force acts on a body, after giving it an initial displacement, the body is said to have free vibrations.

  • True
  • False
Q.9

An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

  • addendum circle
  • dedendum circle
  • pitch circle
  • clearance circle
Q.10

A system of masses rotating in different parallel planes is in dynamic balance if the

  • resultance force is equal to zero
  • resultant couple is equal to zero
  • resultant force and resultant couple are both equal to zero
  • resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Q.11

If the pressure angle is __________ , a reciprocating follower will jam in its bearings.

  • too small
  • too large
Q.12

An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

  • addendum circle
  • dedendum circle
  • pitch circle
  • clearance circle
Q.13

The inertia force is equal to the accelerating force in magnitude, but opposite in direction.

  • Right
  • Wrong
Q.14

The addendum is the radial distance of tooth from the pitch circle to the top of the tooth.

  • Agree
  • Disagree
Q.15

The inertia force is equal to the accelerating force in magnitude, but opposite in direction.

  • Right
  • Wrong
Q.16

In vibration isolation system, if ω/ωn >then the phase difference between the transmitted force and the disturbing force is

  • 0°
  • 90°
  • 180°
  • 270°
Q.17

Which of the following is a pendulum type governor?

  • Watt governor
  • Porter governor
  • Hartnell governor
  • none of these
Q.18

A force acting in the opposite direction to the motion of the body is called force of friction.

  • True
  • False
Q.19

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

  • ωR cos θ
  • ω(R - r1)cos θ
  • ω(R - r1)sin θ
  • ωr1 sin θ
Q.20

For the isochronous Porter governor, the controlling force curve is a straight line passing through the origin.

  • Correct
  • Incorrect
Q.21

The periodic time of one oscillation for a simple pendulum is

Q.22

A mechanism __________ for transmitting or transforming motion.

  • can be used
  • can not be used
Q.23

The maximum fluctuation of energy is the

  • difference between the maximum and minimum energies
  • sum of the maximum and minimum energies
  • variations of energy above and below the mean resisting torque line
  • ratio of the mean resisting torque to the workdone per cycle
Q.24

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

  • 10° - 15°
  • 15° - 25°
  • 25° - 30°
  • 30° - 40°
Q.25

The brake commonly used in railway trains is

  • shoe brake
  • band brake
  • band and block brake
  • internal expanding brake
Q.26

The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

  • μ W R cosec α
  • μ W R cosec α
  • μ W R cosec α
  • μ W R cosec α
Q.27

Sensitiveness of the governor is defined as the ratio of the

  • mean speed to the maximum equilibrium speed
  • mean speed to the minimum equilibrium speed
  • difference of the maximum and minimum equilibrium speeds to the mean speed
  • sum of the maximum and minimum equilibrium speeds to the mean speed
Q.28

The two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as

  • spur gearing
  • helical gearing
  • bevel gearing
  • spiral gearing
Q.29

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

  • 10° - 15°
  • 15° - 25°
  • 25° - 30°
  • 30° - 40°
Q.30

Bifilar suspension method is used to find the

  • angular acceleration of the body
  • moment of inertia of the body
  • periodic time of the body
  • frequency of vibration of the body
Q.31

Which of the following is an example of sliding 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.32

Which of the following statement is correct?

  • For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.
  • For involute gears, the pressure angle changes with the change in centre distance between gears.
  • The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.
  • all of the above
Q.33

The velocity of sliding __________ the distance of the point of contact from the pitch point.

  • is directly proportional to
  • is inversely proportional to
  • is equal to cos φ multiplied by
  • does not depend upon
Q.34

The D-slide valve is also known as

  • inside admission valve
  • outside admission valve
  • piston slide valve
  • none of these
Q.35

The relation between number of links (l) and number of joints (j) in a kinematic chain is

  • l = (j + 2)
  • l = (j + 2)
  • l = (j + 3)
  • l = j + 4
Q.36

The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.

  • zero
  • minimum
  • maximum
Q.37

The angle of inclination of the plane, at which the body begins to move down the plane is called

  • angle of friction
  • angle of repose
  • angle of projection
  • none of these
Q.38

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, areHz andHz respectively. The lowest critical speed is

  • 5367 r.p.m.
  • 6000 r.p.m.
  • 9360 r.p.m.
  • 12000 r.p.m.
Q.39

Which of the following property of the instantaneous centre is correct ?

  • A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.
  • The two rigid links have no linear velocity relative to each other at the instantaneous centre.
  • The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
  • all of the above
Q.40

The virtual or equivalent eccentric for the Meyer's expansion valve is defined as an eccentric having such a length and angle of advance that will cause cut-off to take place at the same position, as is caused by the combined effect of main eccentric and expansion eccentric.

  • Right
  • Wrong
Q.41

The relation l = (j +apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

  • one lower pair and two additional links
  • two lower pairs and one additional link
  • two lower pairs and two additional links
  • any one of these
Q.42

The distance moved by the valve from one end to the other end is called valve travel.

  • True
  • False
Q.43

The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

  • inner edge
  • outer edge
Q.44

The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as

  • structure
  • machine
  • inversion
  • compound mechanism
Q.45

If the number of links in a mechanism are equal to l, then the number of possible inversions are equal to

  • l - 2
  • l - 1
  • l
  • l + 1
Q.46

A spring controlled governor is said to be unstable 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.47

The total number of instantaneous centres for a mechanism consisting of n links are

  • n/2
  • n
  • n - 1
  • n(n - 1)/2
Q.48

The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.

  • Yes
  • No
Q.49

A kinematic chain is known as a mechanism when

  • none of the links is fixed
  • one of the links is fixed
  • two of the links are fixed
  • none of these
Q.50

The face of the tooth is the

  • surface of the top of tooth
  • surface of tooth above the pitch surface
  • width of tooth below the pitch surface
  • width of tooth measured along the pitch circle
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