Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. The capacity of a crane is expressed in terms of
a. Span
b. Type of drive
c. Tonnes
d. Any of the above.
Q. The traveling speed of cranes varies from
a. 1 to 2.5 m/s
b. 5 to 15 m/s
c. 20 to 22.5 m/s
d. 25 to 40 m/s.
Q. In overhead traveling cranes
a. continuous duty motors are used
b. slow speed motors are preferred
c. short time rated motors arc preferred
d. none of the above.
Q. 15 minute rated motors are suitable for
a. light duty cranes
b. medium duty cranes
c. heavy duty cranes
d. all of the above.
Q. Light duty cranes are generally used in
a. automobile workshops
b. pumping stations
c. power houses
d. All of the above.
Q. Heavy duty cranes are used in
a. Heavy engineering workshops
b. Steel plants
c. Ore handling plants
d. All of the above.
Q. 1/2 hour rated motors are used for
a. light duty cranes
b. medium duty cranes
c. heavy duty cranes
d. none of the above.
Q. Which of the following drive can be used for derricks and winches ?
a. DC motors with Ward Leonard control
b. AC slip-ring motors with variable resistance
c. Pole changing squirrel cage motors
d. Any of the above.
Q. A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for
a. lifting
b. hoisting
c. lowering
d. landing the loa
Q. A pole changing type squirrel cage motor used in derricks has four, eight andtwenty four poles. In this the lowest speed is used for
a. lifting
b. hoisting
c. lowering
d. landing the loa