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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Cast iron
Aluminium
Mild steel
Brass

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° - φ
45° + φ/2
45° - φ/2
90° - φ

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Machine Design
Rankine Gordon formula for buckling is valid for

Short column
Very long column
Short and long column
Long column

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that the

Actual size is 100 mm
Difference between the actual size and basic size is 100 mm
None of these
Basic size is 100 mm

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Machine Design
A saddle key __________ power through frictional resistance only.

Either A or B
Does not transmit
None of these
Transmits

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Small overall dimensions
All of these
Low starting and low running friction except at very high speeds
Accuracy of shaft alignment

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