Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. Introduction of automation in production process has become possible onlybecause of the use of
a. An electric drive
b. Group drives
c. Individual and multi motor drives
d. Individual Drive
Q. DC motor are still preferred for use in
a. Electric excavators, steel mills and cranes
b. Lathes and machine tools
c. Flour Mills and Jaw crushers
d. Paper industry
Q. In jaw crushers, a motor has to often start against
a. low load
b. medium load
c. normal load
d. heavy loa
Q. Motor used for elevators is generally
a. synchronous motor
b. induction motor
c. capacitor start single phase motor
d. any of the above.
Q. In synthetic fibre mills motor with
a. constant speeds are preferred
b. high starting torque are preferred
c. variable speed are preferred
d. low starting torque are preferre
Q. Which of the following motor is preferred for synthetic fibre mills ?
a. series motor
b. reluctance motor
c. shunt motor
d. synchronous motor.
Q. Reluctance motor is a
a. self-starting type synchronous motors
b. low torque variable speed motor
c. variable torque motor
d. low noise, slow speed motor.
Q. A reluctance motor
a. is compact
b. has high cost
c. requires starting gear
d. is provided with slip rings.
Q. Power factor in case of reluctance motor is
a. nearly unity
b. always leading
c. 0.8
d. 0.3 to 0.4.
Q. A reluctance motor on over-load runs as
a. synchronous motor
b. induction motor
c. either of the two.
d. all
Q. The size of a excavator is usually expressed in terms of
a. cubic meters
b. travel in meters
c. angle of swing
d. 'crowd' motion
Q. Ward-Leonard controlled dc drives are generally used for
a. light duty excavators
b. medium duty excavators
c. heavy duty excavators
d. all of the above.
Q. In case of contactors, the contacts are generally made of
a. copper
b. silver
c. cadmium copper
d. any of the above.