Question 71 : When two helical springs of equal lengths are arranged to form a cluster spring, then
1. load taken by each spring will be half the total load
2. all of the above
3. none of these
4. shear stress in each spring will be equal
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Question 72 : A machine part subjected to __________ is called a strut.
1. an axial tensile force
2. an axial compressive force
3. any one of these
4. pitch circle diameter x sin ?
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Question 73 : In case of pressure vessels having closed ends, the fluid pressure induces
1. shear stress
2. longitudinal stress
3. circumferential stress
4. none of these
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Question 74 : A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
1. internal bevel gears
2. angular bevel gears
3. crown bevel gears
4. mitre gears
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Question 75 : For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be
1. 6
2. 8
3. 4
4. 10
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Question 76 : A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called
1. hydrodynamic lubricated bearing
2. hydrostatic lubricated bearing
3. boundary lubricated bearing
4. zero film bearing
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Question 77 : When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will
1. move towards right of the bearing making no metal to metal contact
2. have contact at the bottom most of the bearing
3. move towards right of the bearing making the metal to metal contact
4. move towards left of the bearing making metal to metal contact
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Question 78 : The standard length of the shaft is
1. 5 m
2. all of these
3. 7 m
4. 6 m
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Question 79 : According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
1. equating tearing resistance of the plate to the crushing resistance of the rivets
2. equating tearing resistance of the plate to the shearing resistance of the rivets
3. equating shearing resistance to the crushing resistance of the rivets
4. none of the above
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