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Machine Design

Machine Design
The crest diameter of a screw thread is same as

Pitch diameter
Core diameter
Minor diameter
Major diameter

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Machine Design
Which of the following is not correct procedure to increase the fatigue limit?

Cold working
Under stressing
Shot peening
Surface decarburisation

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Machine Design
The longitudinal joint in boilers is used to get the required

Efficiency of boiler
Length of boiler
Length and diameter of boiler
Diameter of boiler

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Machine Design
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

Alternating stress
Repeated stress
Yield stress
Fluctuating stress

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Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Larger than
None of these
Smaller than
Equal to

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

10 microns
0.01 micron
1 micron
0.1 micron

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