Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. For which of the following locomotives the maintenance requirements are theleast?
a. Steam locomotives
b. Diesel locomotives
c. Electric locomotives
d. Equal in all of the above
Q. Which of the following methods is used to control speed of 25 kV, 50 Hz singlephase traction ?
a. Reduced current method
b. Tap changing control of transformer
c. Series parallel operation of motors
d. All of the above
Q. The most suitable servo-motor application is __________
a. AC series motor
b. DC series motor
c. AC two-phase induction motor
d. DC shunt motor
Q. The size of an excavator is usually expressed in terms of
a. ‘crowd’ motion
b. angle of swing
c. cubic metres
d. travel in metres
Q. For blowers which of the following motor is preferred ?
a. D.C. series motor
b. D.C. shunt motor
c. Squirrel cage induction motor
d. Wound rotor induction motor
Q. Belted slip ring induction motor is almost invariably used for
a. water pumps
b. jaw crushers
c. centrifugal blowers
d. none of the above
Q. Which of the following is essentially needed while selecting a motor ?
a. Pulley
b. Starter
c. Foundation pedal
d. Bearings
Q. Reluctance motor is a
a. variable torque motor
b. low torque variable speed motor
c. self starting type synchronous motor
d. low noise, slow speed motor
Q. method of starting a three phase induction motor needs six terminals.
a. Stardelta
b. Resistance starting
c. Auto-transformer
d. None of the above
Q. In method of staging three phase induction motors the starting voltage is notreduced.
a. auto-transformer
b. star-delta
c. slip ring
d. any of the above
Q. For a motor-generator set which of the following motors will be preferred ?
a. Synchronous motor
b. Slip ring induction motor
c. Pole changing induction motor
d. Squirrel cage induction motor
Q. Which of the following motors is usually preferred for kiln drives?
a. Cascade controlled A.C. motor
b. Slip ring induction motor
c. Three phase shunt wound com-mutator motor
d. Any of the above
Q. Heat control switches are used in
a. transformers
b. cooling ranges
c. three phase induction motors
d. single phase