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Machine Design

Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

Half
Thrice
Twice
None of these

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Machine Design
Idler pulley is used for

For applying tension
Changing the direction of motion of belt
Increasing velocity ratio
All of these

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Both the shafts are equally good
None of these
Shaft A is better than shaft B
Shaft B is better than shaft A

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Machine Design
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

All of these
0.5 mm up to rivet diameter of 24 mm
1 mm for rivet diameter from 27 mm to 36 mm
2 mm for rivet diameter from 39 mm to 48 mm

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Machine Design
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

Zero film bearing
Boundary lubricated bearing
Hydrodynamic lubricated bearing
Hydrostatic lubricated bearing

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Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Finer
Very fine
Same
Coarser

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