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Machine Design

Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

2
16
8
4

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Machine Design
For high speed engines, the cam follower should move with

Uniform velocity
Simple harmonic motion
Cycloidal motion
Uniform acceleration and retardation

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Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Multiple threads
Acme threads
Buttress threads
Square threads

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Machine Design
According to Indian standards, total numbers of tolerance grades are

8
20
18
12

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/3σt
pd/σt
pd/4σt
pd/2σt

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Machine Design
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is

Equal to 1/10
Greater than 1/10
Less than 1/10
None of these

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