Question 61 : An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the
1. tip of the pinion and flank of gear
2. flanks of both gear and pinion
3. tip of the gear and flank of pinion
4. tip of both gear and pinion
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Question 62 : When the speed of belt increases,
1. the coefficient of friction between the belt and pulley increases
2. the power transmitted will increase
3. the coefficient of friction between the belt and pulley decreases
4. the power transmitted will decrease
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Question 63 : The wire ropes make contact at
1. sides and bottom of groove of the pulley
2. anywhere in the groove of the pulley
3. bottom of groove of the pulley
4. sides of groove of the pulley
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Question 64 : In a marine flange coupling, the thickness of flange is taken as
1. 3 d/4
2. d/3
3. d/2
4. d/4
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Question 65 : The flank of the tooth is the
1. width of the tooth measured along the pitch circle
2. surface of the tooth above the pitch surface
3. surface of the top of the tooth
4. surface of the tooth below the pitch surface
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Question 66 : The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that
1. it is subjected to a higher stress than the outer side
2. it is more stretched than the outer side during the manufacturing process
3. it is subjected to a higher cyclic loading than the outer side
4. it has a lower curvature than the outer side
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Question 67 : The contact ratio is the ratio of
1. length of path of contact to the circular pitch
2. length of arc of contact to the circular pitch
3. length of arc of approach to the circular pitch
4. length of arc of recess to the circular pitch
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Question 68 : The period during which the cam follower remains at rest, when cam moves, is known as
1. idle period
2. fixed period
3. constant period
4. dwell period
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Question 69 : Which one of the following is a positive drive?
1. Crossed flat belt drive
2. V-belt drive
3. Rope drive
4. Chain drive
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Question 70 : The included angle for the British Association thread is
1. 47.3°
2. 55°
3. 29°
4. 60°
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