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Machine Design

Machine Design
The material used for brake lining should have __________ coefficient of friction.

High
Moderate
Low
None of these

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Machine Design
The acme threads are usually found on

Spindles of bench vices
Feed mechanism of machine tools
Screw cutting lathes
Railway carriage couplings

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Machine Design
Which of the following has threads at both ends?

Stud
Bolt
Tap bolt
None of these

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

0.01 micron
0.1 micron
1 micron
10 microns

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

4 τ
τ/2
τ
2 τ

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Machine Design
The rocker arms in internal combustion engines are of__________.

None of these
Second type levers
Third type levers
First type levers

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