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A friction circle is drawn when a journal rotates in bearing. Its radius...

Q.  
A friction circle is drawn when a journal rotates in bearing. Its radius depends on the coefficient of friction and the


Answer & Explanation

Answer :   Option: D


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More Questions Theory of Machines:

Q.  
Frictional torque for threads at mean radius while raising load is given by

A. WR.tan(φ−α)

B. WR.tan(φ+α)

C. WR.tanα

D. WR.tanφ


Answer & Explanation

Q.  
To ensure self-locking in a screw jack, it is essential that helix angle is

A. Larger than friction angle

B. Smaller than friction angle

C. Equal to friction angle

D. Such as to give maximum efficiency in lifting


Answer & Explanation

Q.  
The maximum efficiency of a self-locking screw is

A. 50%

B. 70%

C. 75%

D. 80%


Answer & Explanation

Q.  
In a collar thrust bearing, the number of collars have been doubled, while maintaining to coefficient of friction and axial thrust same. This will result in

A. Same frictional torque and same bearing pressure

B. Double frictional torque and half bearing pressure

C. Double frictional torque and same bearing pressure

D. Same frictional torque and half bearing pressure


Answer & Explanation
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