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Machine Design

Machine Design
A bench vice has following type of threads

Square
Metric
Buttress
Acme

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Machine Design
Gears are casted by

Centrifugal casting
Permanent mould casting
Slush casting
Sand mould casting

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Machine Design
In a partial journal bearing, the angle of contact of the bearing with the journal is

180°
360°
270°
120°

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Machine Design
Which one of the following is a positive drive?

V-belt drive
Chain drive
Rope drive
Crossed flat belt drive

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Machine Design
The rated life of a bearing varies

Inversely as cube of load
Inversely as fourth power of load
Directly as load
Inversely as square of load

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

1 to 2
0.5 to 1
3 to 5
5 to 10

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