Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

0.8 d
1.2 d
1.57 d
1.8 d

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Is maximum at zero speed and decreases monotonically with increase in speed
Is minimum at zero speed and increases monotonically with increase in speed
Remains constant at all speeds
Becomes minimum at an optimum speed and then increases with further increase in speed

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A bolt of uniform strength can be developed by

Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter smaller than the diameter of the unthreaded portion

ANSWER DOWNLOAD EXAMIANS APP