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Machine Design

Machine Design
Belt slip may occur due to

Heavy load
Driving pulley too small
Loose belt
All of these

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Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Hollow saddle key
Hollow key
Soft key
None of these

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Small overall dimensions
Accuracy of shaft alignment
Low starting and low running friction except at very high speeds
All of these

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Decrease with decrease in y
Increase with increase in y
Be independent of ratio of mass of load W to mass of bar (y)
Depend on other considerations

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² compression
3.6 N/mm² tension
7.2 N/mm² tension
3.6 N/mm² compression

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

4F/ πd²
6F/ πd²
16F/ 3πd²
8F/ πd²

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