Q.1
In a crank and slotted lever quick-return motion, the distance between the fixed centres ismm and the length of the driving crank is 75mm. the ratio of the time taken on the cutting and return strokes is
  • a) 1.5
  • b) 2.0
  • c) 2.2
  • d) 2.93
Q.2
A helical coil spring of stiffness k is cut to two equal halves and then these are connected in parallel to support a vibrating mass m. The angular frequency of vibration, ωn is
  • a) √k/m
  • b) √2k/m
  • c) √4k/m
  • d) √k/4m
Q.3
Consider the following statements:
  • a) 1 and 4
  • b) 1 and 3
  • c) 2 and 3
  • d) 2 and 4
Q.4
Which one of the following mechanisms is an inversion of double slider-crank chain?
  • a) Elliptic trammels
  • b) Beam engine
  • c) Oscillating cylinder engine
  • d) Coupling rod of a locomotive
Q.5
The number of instantaneous centres of rotation for a 10-link kinematic chain is
  • a) 36
  • b) 90
  • c) 120
  • d) 45
Q.6
A slider moves with uniform velocity on a revolving link of length r with angular velocity ω. The Coriolis acceleration component of a point on the slider relative to a coincident point on the link is equal to
  • a) ω parallel to the link
  • b) 2ω perpendicular to the link
  • c) ω perpendicular to the link
  • d) 2ω parallel to the link
Q.7
In a crank and slotted lever type quick return mechanism, the link moves with an angular velocity ofrad/s, while the slider moves with the linear velocity of 1.5 m/s. The magnitude and direction of Coriolis component of acceleration with respect to angular velocity are
  • a) 30 m/s2 and direction is such as to rotate slider velocity in the same sense as the angular velocity
  • b) 30 m/s2 and direction is such as to rotate slider velocity in the opposite sense as the angular velocity
  • c) 60 m/s2 and direction is such as to rotate slider velocity in the same sense as the angular velocity
  • d) 60 m/s2 and direction is such as to rotate slider velocity in the opposite sense as the angular velocity.
Q.8
Has only turning pairsControls movement of two front wheels
  • a) 2, 4, 5 and 6
  • b) 1, 2, 3 and 6
  • c) 2, 3, 5 and 6
  • d) 1, 2, 3 and 5
Q.9
The crankshaft of reciprocating engine having acm crank andcm connecting rod rotates atr.p.m. When the crank angle is 45o, the velocity of piston is nearly
  • a) 1.8m/s
  • b) 1.9m/s
  • c) 3.5m/s
  • d) 19m/s
0 h : 0 m : 1 s