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Machine Design

Machine Design
Which one of the following is a positive drive?

Crossed flat belt drive
Chain drive
Rope drive
V-belt drive

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/9
W/2
8W/9
2W/3

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Machine Design
The design of the pressure vessel is based on

Longitudinal and hoop stress
None of these
Longitudinal stress
Hoop stress

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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)1/2
(6V/ π)2
(6V/ π)3
(6V/ π)1/3

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Machine Design
Shaft coupling is used in machinery to

All of these
Introduce mechanical flexibility
Introduce protection against over loads
Reduce the transmission of shock loads

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Machine Design
The acme threads are usually found on

Railway carriage couplings
Spindles of bench vices
Screw cutting lathes
Feed mechanism of machine tools

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