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Machine Design

Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

21
25
15
17

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Greater than unity
Equal to 1
None of these
Less than unity

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Machine Design
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.

Square
Parallel
None of these
Rectangular

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Machine Design
The groove angle of pulleys for V-belt is

300 to 320
More than 400
420 to 450
340 to 360

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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
Rankine Gordon formula for buckling is valid for

Long column
Very long column
Short column
Short and long column

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