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Machine Design

Machine Design
Belt slip may occur due to

Loose belt
All of these
Heavy load
Driving pulley too small

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Machine Design
The power transmitted by the belt drive can be increased by

All of these
Increasing wrap angle by using idler pulley
Dressing the belt to increase the coefficient of friction
Increasing the initial tension in the belt

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

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is equal to crushing strength
Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of these

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Machine Design
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

Three times
Equal to
Twice
Four times

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.7 times
0.6 times
0.4 times
0.8 times

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