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Machine Design

Machine Design
Which is positive drive?

V belt drive
Flat belt drive
Crossed belt drive
Timing belt

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Machine Design
The included angle for the British standard whitworth thread is

47.5°
55°
60°
29°

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Machine Design
The application of third type levers is found in

Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve
A pair of tongs

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.98
0.99
0.96
0.97

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Machine Design
The shock resistance of steel is increased by adding

Cobalt and molybdenum
Nickel and chromium
Chromium
Nickel

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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.

None of these
Partially
Either A or B
Fully

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