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Machine Design

Machine Design
The helix angle for double helical gears may be made up to

75°
45°
60°
90°

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Machine Design
In a flange coupling, the flanges are coupled together by means of

Headless taper bolts
Studs
None of these
Bolts and nuts

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Prevent the rotation of load being lifted
Reduce the effort needed for lifting the working load
Reduce the value of frictional torque
Enhance the load carrying capacity of the jack

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Machine Design
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

Head
Middle
Thread
Shank

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Machine Design
In case of pressure vessels having open ends, the fluid pressure induces

None of these
Circumferential stress
Shear stress
Longitudinal stress

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Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

63 to 70%
45 to 60%
80 to 90%
70 to 83%

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