Theory of Machine objective type questions/Multiple choice questions
Q61. The product of the diametral pitch and circular pitch is equal to
(b) 1/ π
(d) 2 π
Q62. The contact ratio is given by
(a) Length of the path of approach/ Circular pitch
(b) Length of the path of recess/ Circular pitch
(c) Length of the arc of contact/ Circular pitch
(d) Length of the arc of approach/ cos ∅
Q63. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
(a) to move the ship towards star board
(b) to move the ship towards port side
(c) to raise the bow and lower the stem
(d) to raise the stern and lower the bow
Q64. The maximum fluctuation of speed is the
(a) difference of minimum fluctuation of speed and the mean speed
(b) difference of the maximum and minimum speeds
(c) sum of maximum and minimum speeds
(d) variations of speed above and below the mean resisting torque line
Q65. In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
(b) steam lap
(c) exhaust lap
(d) none of these
Q66. In Meyer’s expansion valve, the main valve is driven by an eccentric having an angle of advance from
Q67. Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
(a) D-slide valve
(d) Meyer’s expansion valve
Q68. A watt s governor can work satisfactorily at speeds from
(a) 60 to 80 r.p.m.
(b) 80 to 100 r.p.m.
(c) 100 to 200r.p.m.
(d)200 to 300 r.p.m.
Q69. When the sleeve of a Porter governor moves downwards, the governor speed
(c) remains unaffected
(d) first increases and then decreases
Q70. In a Hartnell governor, the compression of the spring is…………..the lift of the sleeve.
(a) equal to
(b) less than
(c) greater than
(d) none of these
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