9) In a belt drive, the outer surface of the pulley is made in convex form. Which one of the following statements is NOT true about this convex surface ?
It causes excessive belt wear
Related Transmission of Power MCQ with Answers
it is required to start or stop driven shaft without disturbing the driving shaft
A fast and loose pulley, used on shafts enables machine to be started or stopped at will. A fast pulley is keyed to the machine shaft while the loose pulley runs freely. The belt runs over the fast pulley to transmit power by the machine and it is shifted to the loose pulley when the machine is not required to transmit power. By this way, stopping of one machine does not interfere with the other machines which run by the same line shaft.Paper Pulleys, Fast and Loose Pulleys.
lathe
In Lathe stepped pulley drive is used for obtaining different spindle speeds
It can engage and disengage driving and driven shafts as a normal operation
A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both.
muff coupling
Muff coupling is a long cylindrical coupling bored and keyed to fit over both shafts.
