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Machine Design

Machine Design
The helix angle for double helical gears may be made up to

60°
90°
45°
75°

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Prevent the rotation of load being lifted
Enhance the load carrying capacity of the jack
Reduce the effort needed for lifting the working load
Reduce the value of frictional torque

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Machine Design
The wire ropes make contact at

Bottom of groove of the pulley
Sides of groove of the pulley
Sides and bottom of groove of the pulley
Anywhere in the groove of the pulley

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Machine Design
Two shafts will have equal strength, if

Diameter of both the shafts is same
Twisting moment of both the shafts is same
Material of both the shafts is same
Angle of twist of both the shafts is same

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Machine Design
The centre to centre distance between two consecutive rivets in a row, is called

Back pitch
Pitch
Margin
Diagonal pitch

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Extremely hazardous
Cheapest method
Has no effect as regards fatigue strength
Best method

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