IN_SHORT_OPEN-BELT_DRIVES,_AN_IDLER_PULLEY_IS_USED_IN_ORDER_TO_DECREASE_THE_ANGLE_OF_CONTACT_ON_THE_SMALLER_PULLEY_FOR_HIGHER_POWER_TRANSMISSION.?$

IN_SHORT_OPEN-BELT_DRIVES,_AN_IDLER_PULLEY_IS_USED_IN_ORDER_TO_DECREAS

1.	IN_SHORT_OPEN-BELT_DRIVES,_AN_IDLER_PULLEY_IS_USED_IN_ORDER_TO_DECREASE_THE_ANGLE_OF_CONTACT_ON_THE_SMALLER_PULLEY_FOR_HIGHER_POWER_TRANSMISSION.?$
A.	True
B.	False
Answer» C.

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In design of arms of a pulley, in belt drive, the cross-section of the arm is elliptical with minor axis placed along the plane of rotation.
In short open-belt drives, an idler pulley is used in order to decrease the angle of contact on the smaller pulley for higher power transmission.
If the angle of wrap on smaller pulley of diameter 250 mm is 1200 and diameter of larger pulley is twice the diameter of smaller pulley, then the centre distance between the pulleys for an open belt drive is
IN_SHORT_OPEN-BELT_DRIVES,_AN_IDLER_PULLEY_IS_USED_IN_ORDER_TO_DECREASE_THE_ANGLE_OF_CONTACT_ON_THE_SMALLER_PULLEY_FOR_HIGHER_POWER_TRANSMISSION.?$
In_design_of_arms_of_a_pulley,_in_belt_drive,_the_cross-section_of_the_arm_is_elliptical_with_minor_axis_placed_along_the_plane_of_rotation.$
If the angle of wrap on smaller pulley of diameter 250 mm is 120<sup>0</sup> and diameter of larger pulley is twice the diameter of smaller pulley, then the centre distance between the pulleys for an open belt drive i?
If the velocity ratio for an open belt drive is 8 and the speed of driving pulley is 800 r.p.m, then considering an elastic creep of 2% the speed of the driven pulley is
In a weston differential pulley block, the number of recesses in the smaller wheel is 9/10 of that of the larger wheel. If the efficiency of the machine is 50%, find the load lifted by an effort of 300N.
Five pulleys are arranged in the second system of pulleys. When not loadwd the effort required to raise the movable block is 35N. Further wastage in friction increases the pull at the rate of 3% of the load lifted. What is the efficiency of the system at 2kN?
Five pulleys are arranged in the second system of pulleys. When not loaded the effort required to raise the movable block is 35N. Further wastage in friction increases the pull at the rate of 3% of the load lifted. What is the effort required to raise a load of 2kN?

IN_SHORT_OPEN-BELT_DRIVES,_AN_IDLER_PULLEY_IS_USED_IN_ORDER_TO_DECREASE_THE_ANGLE_OF_CONTACT_ON_THE_SMALLER_PULLEY_FOR_HIGHER_POWER_TRANSMISSION.?$

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