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Machine Design

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

67.5°
22.5°
45°
90°

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Mitre gears
Internal bevel gears
Angular bevel gears
Crown bevel gears

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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/2
90° - φ
45° - φ
45° + φ/2

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Machine Design
A universal coupling is used to connect two shafts

Have lateral misalignment
Whose axes intersect at a small angle
Which are perfectly aligned
Which are not in exact alignment

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Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with fine pitch
Could be left or right hand
Right hand with same pitch
Left hand with same pitch

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Increases markedly
Remain same
Decreases markedly
Depends on heat treatment carried out

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