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Machine Design

Machine Design
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

Heavier
Moderate
Lighter
None of these

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Machine Design
Stress concentration factor is defined as the ratio of

Nominal stress to the maximum stress
Nominal stress to the endurance limit
Maximum stress to the nominal stress
Maximum stress to the endurance limit

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Machine Design
In a journal bearing, the load on the bearing is __________ to the axis of the journal.

Perpendicular
Parallel
Both A and B
None of these

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Machine Design
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

√(M² + T²)
(1/2) × [M + √(M² + T²)]
(1/2) × √(M² + T²)
M + √(M² + T²)

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Machine Design
A screw is said to be over hauling screw, if the

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

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Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

7 N-m
15 N-m
10 N-m
5 N-m

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