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Machine Design

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

90°
75°
45°
60°

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Machine Design
Which of the following is a permanent fastening?

Cotters
Bolts
Rivets
Keys

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Machine Design
The shear plane in case of bolts should

Be across threaded portion of shank
Never be across the threaded portion
Be parallel to axis of bolt
Be normal to threaded portion of shank

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Machine Design
The surface finish factor for a mirror polished material is

0.45
0.65
0.85
1

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Machine Design
For maximum power, the velocity of the belt will be

√(T/m)
None of these
√(T/3m)
√(T/2m)

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Machine Design
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

Either A or B
Fully
Partially
None of these

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