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MACHINE DESIGN

Machine Design
According to Indian standard specifications, 100 H6/g5 means that the

Actual size is 100 mm
Difference between the actual size and basic size is 100 mm
Basic size is 100 mm
None of these

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Machine Design
The railway carriage couplings have

Acme threads
Square threads
Knuckle threads
Buttress threads

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Machine Design
Gear box is used

To obtain variable speeds
For speed reduction
To produce torque
To increase efficiency of system

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Machine Design
The centre distance between two meshing involute gears is equal to

Difference of pitch circle radii/cosφ
Sum of pitch circle radii/cosφ
Difference of base circle radii/cosφ
Sum of base circle radii/cosφ

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Machine Design
The helix angle for single helical gears ranges from

35° to 50°
20° to 35°
10° to 15°
15° to 20°

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