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Machine Design

Machine Design
Screws used for power transmission should have

Strong teeth
Very fine threads
High efficiency
Low efficiency

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Crown bevel gears
Angular bevel gears
Internal bevel gears
Mitre gears

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

Less than 50%
Equal to 50%
More than 50%
None of these

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Machine Design
The rivet head used for boiler plate riveting is usually

Counter sunk head
Snap head
Pan Head
Conical head

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Machine Design
An alien bolt is

Provided with hexagonal depression in head
Same as stud
Self locking bolt
Used in high speed components

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Low starting and low running friction except at very high speeds
Accuracy of shaft alignment
Small overall dimensions
All of these

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