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Machine Design

Machine Design
Screws used for power transmission should have

Very fine threads
Strong teeth
Low efficiency
High efficiency

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Machine Design
The objective of idler pulley in belt drive is to

Decrease the tendency of belt to slip
Increase the wrap angle and belt tension
All the above objectives
Increase the power transmission capacity

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Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.75
0.65
0.55
0.45

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Machine Design
In a horizontal flat belt drive, it is customary to use

Top side of belt as slack side
Bottom side of belt as slack side
None of these
Idler pulley

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2136 N-m
2000 N-m
2100 N-m
2050 N-m

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Machine Design
The maximum normal stress theory is used for

Plastic materials
Ductile materials
Non-ferrous materials
Brittle materials

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