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Machine Design

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

75°
90°
60°
45°

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

Bending stress only
Direct shear stress only
A combination of bending stress and direct shear stress
A combination of torsional shear stress and bending

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Machine Design
The radial distance of a tooth from the pitch circle to the top of the tooth is called

Addendum
Clearance
Working depth
Dedendum

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Machine Design
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

Brown colour
Grey colour
Yellow colour
White colour

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Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Gib-head key
Wood ruff key
Flat saddle key
Feather key

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Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Joint may not open up
Bolts are weakest elements
The resultant load on the bolt would not be affected by the external cyclic load
Bolts will not loosen during service

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