Machine Design
In a steam engine, the valve rod is connected to an eccentric rod by means of

Cotter joint
Universal joint
Flange coupling
Knuckle joint

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Machine Design
Turn buckle has

Right hand threads on bout ends
No threads
Left hand threads on one end and right hand threads on other end
Left hand threads on both ends

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Machine Design
Which of the following statement is correct regarding power screws?

The efficiency of a self locking screw can not be more than 50%
Both (A) and (B)
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread

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