Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/2

2W/3

8W/9

W/9

W/2

2W/3

8W/9

W/9

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.97

0.98

0.96

0.99

0.97

0.98

0.96

0.99

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Machine Design
When compared to the rod of the same diameter and material, a wire rope

Provides much greater time for remedial action before failure

Has a much smaller load carrying capacity

Does not provide much warning before failure

Is less flexible

Provides much greater time for remedial action before failure

Has a much smaller load carrying capacity

Does not provide much warning before failure

Is less flexible

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

All of these

Dressing the belt to increase the coefficient of friction

Increasing wrap angle by using idler pulley

Increasing the initial tension in the belt

All of these

Dressing the belt to increase the coefficient of friction

Increasing wrap angle by using idler pulley

Increasing the initial tension in the belt

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

80 to 90%

70 to 83%

45 to 60%

63 to 70%

80 to 90%

70 to 83%

45 to 60%

63 to 70%

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Machine Design
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

Equating tearing resistance of the plate to the shearing resistance of the rivets

Equating shearing resistance to the crushing resistance of the rivets

Equating tearing resistance of the plate to the crushing resistance of the rivets

None of these

Equating tearing resistance of the plate to the shearing resistance of the rivets

Equating shearing resistance to the crushing resistance of the rivets

Equating tearing resistance of the plate to the crushing resistance of the rivets

None of these

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Machine Design

Machine Design In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

Machine Design When compared to the rod of the same diameter and material, a wire rope

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

Machine Design According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

Machine Design According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

Machine Design
When compared to the rod of the same diameter and material, a wire rope

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

Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

Machine Design
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by