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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Less
Same
More
None of these

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Machine Design
A rivet is specified by

Length of rivet
Type of head
Length of tail
Shank diameter

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

12 kN/m
30 kN/m
24 kN/m
6 kN/m

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Machine Design
The value of Lewis form factor used in design of gears is

Dependent on number of teeth of a gear
All of these
Independent of size of teeth
Dependent on system of teeth

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Machine Design
Which of the following is an anti-friction bearing?

Journal bearing
Pedestal bearing
Needle bearing
Collar bearing

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Machine Design
The strength of the unriveted plate (P) per pitch length is equal to

(p - d) t.σt
p.t.σt
p.d.σt
(p - d) σt

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