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Machine Design

Machine Design
The railway carriage couplings have

Buttress threads
Knuckle threads
Square threads
Acme threads

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (3a/b)]
σ [1 + (b/2a)]
σ [1 + (2a/b)]
σ [1 + (b/3a)]

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Machine Design
Which of the following has threads at both ends?

Tap bolt
Bolt
Stud
None of these

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Machine Design
According to Indian standards, total numbers of fundamental deviations are

25
15
20
10

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Machine Design
A crankshaft is a __________ shaft.

Machine frame
Transmission
Machine
None of these

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Mitre gears
Crown bevel gears
Angular bevel gears
Internal bevel gears

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