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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Buttress
NPT (national pipe threads).
Square
Metric

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Machine Design
The cam follower extensively used in aircraft engines is

Spherical faced follower
Knife edge follower
Roller follower
Flat faced follower

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

(6V/ π)3
(6V/ π)2
(6V/ π)1/2
(6V/ π)1/3

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Machine Design
A screw will be self locking, if

Friction angle is equal to helix angle
Efficiency of screw is 100%
Friction angle is more than helix angle
Friction angle is less than helix angle

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Machine Design
Factor of safety for fatigue loading is the ratio of

Elastic limit to the yield point
Young's modulus to the ultimate tensile strength
Endurance limit to the working stress
Elastic limit to the working stress

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

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

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