Mechanical Engineering:: Machine Design

In a flange coupling, the thickness of flanges is taken as one-half the diameter of shaft.

A. Agree B. Disagree

Which of the following statement is wrong ?

A. The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
B. The V-belt drive is used with large centre distance
C The V-belt may be operated in either direction with tight side of the belt at the top or bottom
D. The ratio of driving tensions in V-belt drive is more than flat belt drives

Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

A. shaft B is better than shaft A
B. shaft A is better than shaft B
C both the shafts are equally good

The load cup of a screw jack is made separate from the head of the spindle to

A. enhance the load carrying capacity of the jack
B. reduce the effort needed for lifting the working load
C prevent the rotation of load being lifted
D. reduce the value of frictional torque

The resistance to fatigue of a material is measured by

A. elastic limit
B. Young's modulus
C ultimate tensile strength
D. endurance limit

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