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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
Which of the following welded joint is designed for shear strength?

Butt welded joint
Transverse fillet welded joint
Parallel fillet welded joint
All of these

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Machine Design
The dedendum is the radial distance from the

Pitch circle to the bottom of a tooth
Addendum circle to the clearance circle
Pitch circle to the top of a tooth
Top of a tooth to the bottom of a tooth

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

1100 to 1300°C
500 to 600°C
1300 to 1500°C
700 to 900°C

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

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

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Machine Design
An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Flanks of both gear and pinion
Tip of the pinion and flank of gear
Tip of the gear and flank of pinion
Tip of both gear and pinion

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