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Machine Design

Machine Design
The included angle in unified of American National threads is

29°
47°
60°
55°

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Machine Design
The backlash for spur gears depends upon

Module
Pitch line velocity
Both module and pitch line velocity
Tooth profile

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Machine Design
The stretching in a belt can be controlled by __________ the stress in the belt.

None of these
Both A and B
Reducing
Increasing

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Equal to 1
Less than unity
Greater than unity
None of these

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Machine Design
A bolt is designed on the basis of __________ with a large factor of safety.

Direct shear stress
Direct compressive stress
Direct bending stress
Direct tensile stress

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Machine Design
The objective of idler pulley in belt drive is to

All the above objectives
Increase the wrap angle and belt tension
Increase the power transmission capacity
Decrease the tendency of belt to slip

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