Related Questions

Idler pulley is used
A For changing the direction of motion of the belt
B For applying tension
C For increasing velocity ratio
D All of the above
The objective of idler pulley in belt drive is to
A Decrease the tendency of belt to slip
B Increase the power transmission capacity
C Increase the wrap angle and belt tension
D All the above objectives
For same pulley diameters, center distance, belt speed and belt and pulley materials,
A Open belt drive transmits more power than crossed belt drive
B Crossed belt drive transmits more power than open belt drive
C Open and crossed belt drives transmit same power
D Power transmission does not depend upon open and crossed types of constructions
In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be
A Increase key length
B Increase key depth
C Increase key width
D Double all the dimensions
The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is
A $$\frac{{\text{D}}}{{{\text{D}} - {\text{d}}}}$$
B $$\frac{{\text{D}}}{{{\text{D}} + {\text{d}}}}$$
C $$\frac{{2{\text{D}}}}{{{\text{D}} - {\text{d}}}}$$
D $$\frac{{2{\text{D}}}}{{{\text{D}} + {\text{d}}}}$$
A fast and loose pulley drive is used when
A Shafts are arranged parallel and rotate in the opposite directions
B Shafts are arranged parallel and rotate in the same directions
C Shafts are arranged at right angles and rotate in one definite direction
D Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.
A Rectangular
B Square
C Parallel
D None of these
Pulley in a belt drive acts as
A cylindrical pair
B turning pair
C rolling pair
D sliding pair
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then
A open belt drive is recommended
B cross belt drive is recommended
C both open belt drive and cross belt drive are recommended
D the drive is recommended depending upon the torque transmitted
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.
A Smaller
B Larger
C Either A or B
D None of these

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