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Machine Design

Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

0.5 d
1.25 d
0.75 d
d

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Machine Design
The shock absorbing capacity of a bolt can be increased by

Grinding the shank
Increasing shank diameter
Making shank diameter equal to core diameter of thread
Tightening it properly

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Machine Design
The shear plane in case of bolts should

Be parallel to axis of bolt
Be normal to threaded portion of shank
Never be across the threaded portion
Be across threaded portion of shank

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Machine Design
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

Four times
Twice
Sixteen times
Eight times

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Machine Design
Which of the following bearing is preferred for oscillating conditions?

Angular contact single row ball bearing
Taper roller bearing
Needle roller bearing
Double row roller bearing

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Shear stress
Compressive stress
Tensile stress
Bending stress

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