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Machine Design

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

60°
75°
90°
45°

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

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

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Machine Design
The wear load should be __________ the dynamic load.

Greater than
None of these
Equal to
Less than

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Machine Design
When compared to the rod of the same diameter and material, a wire rope

Has a much smaller load carrying capacity
Provides much greater time for remedial action before failure
Is less flexible
Does not provide much warning before failure

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Mitre gears
Internal bevel gears
Crown bevel gears
Angular bevel gears

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Machine Design
If two springs are in parallel then their overall stiffness will be

Half
Same
None of these
Double

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