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Machine Design

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

90°
45°
67.5°
22.5°

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² compression
7.2 N/mm² tension
3.6 N/mm² tension
3.6 N/mm² compression

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

1680 d
1420 d
2080 d
2840 d

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F + P
P
F
F.P

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Machine Design
The sleeve or muff coupling is designed as a

Hollow shaft
Dun cylinder
Thick cylinder
Solid shaft

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Machine Design
The ratio of driving tensions in V-belt drives is __________ flat belt drives.

sin α times more than
sin α times less than
cosec α times more than
Equal to

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