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Machine Design

Machine Design
Taper usually provided on cotter is

1 in 5
1 in 24
1 in 40
1 in 10

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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
Either A or B
Fully
Partially

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

67.5°
22.5°
90°
45°

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)
(1 - sinφ)/ (1 + cosφ)

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to(Where, Pc = tension in belt due to centrifugal force)

2 Pc
1 Pc
Pc/3
3 Pc

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Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

Varies exponentially, being less at the torque-input end
Varies exponentially, being more at the torque-input end
Is uniform throughout
Varies linearly

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