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Machine Design

Machine Design
The material used for brake lining should have __________ coefficient of friction.

None of these
Low
High
Moderate

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Machine Design
Maximum principal stress theory is applicable for

Ductile materials
Elastic materials
All of these
Brittle materials

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.8
3.0
3.5
2.5

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

0.75/ (0.75 + √v)
4.5/ (4.5 + v)
3/ (3 + v)
6/ (6 + v)

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Machine Design
18/8 steel contains

18% vanadium and 8% nickel
18% nickel and 8% vanadium
18% chromium and 8% nickel
18% nickel and 8% chromium

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

168 d
124 d
138 d
151 d

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