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Machine Design

Machine Design
The number of slots in a 25 mm castle nut is

8
6
2
4

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-eighth
One-fourth
Double
One-half

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
τ/2
τ
4 τ

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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)

0.75 d
1.25 d
d
0.5 d

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Reduce the effort needed for lifting the working load
Prevent the rotation of load being lifted
Enhance the load carrying capacity of the jack
Reduce the value of frictional torque

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Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

6 mm
4 mm
5 mm
7 mm

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