## Machine Design Cold working

Decreases the fatigue strength
Increases the fatigue strength
Alone has no influence on fatigue strength
Has no influence on fatigue strength

## Machine Design For same pulley diameters, center distance, belt speed and belt and pulley materials,

Crossed belt drive transmits more power than open belt drive
Open and crossed belt drives transmit same power
Open belt drive transmits more power than crossed belt drive
Power transmission does not depend upon open and crossed types of constructions

σ [1 + (2a/b)]
σ [1 + (b/2a)]
σ [1 + (b/3a)]
σ [1 + (3a/b)]

## Machine Design The power transmitted by means of a belt depends upon

Velocity of the belt
All of these
Tension under which the belt is placed on the pulleys
Arc of contact between the belt and the smaller pulley

## Machine Design When a bolt is subjected to an external load, the stress induced in the bolt will be

Tensile stress
Shear stress
Any one of these
Combined tensile and shear stress

## Machine Design Which of the following statement is correct, for two shafts connected in parallel?

Torque in each shaft is the same
Angle of twist of each shaft is the same
Shear stress in each shaft is the same
Torsional stiffness of each shaft is the same