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Machine Design

Machine Design
The contact ratio for gears is

Greater than one
Zero
None of these
Less than one

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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

Grey colour
White colour
Yellow colour
Brown colour

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Machine Design
Screws used for power transmission should have

Low efficiency
Very fine threads
High efficiency
Strong teeth

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Machine Design
Belt slip may occur due to

All of these
Heavy load
Loose belt
Driving pulley too small

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Machine Design
The included angle in unified of American National threads is

47°
29°
60°
55°

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Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.45
0.75
0.55
0.65

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