Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. In........ method of starting three phase induction motors the starting voltage is not reduced
a. Auto transformer
b. Star Delta
c. Slip ring
d. Any of the above
Q. For which off the following applications DC motors are still preferred?
a. High operation
b. Variable speed drive
c. High starting torque
d. Reversibility
Q. Rotor of the motor is usually supported on........... bearings
a. Ball or roller
b. Needle
c. Thrust
d. Bush
Q. .............method of starting a three phase induction motor needs six terminals
a. Resistance starting
b. Auto transformer
c. None of the above
d. Star delta
Q. In a paper mill where constant speed is required
a. Synchronous motors are preferred
b. AC motors are preferred
c. Individual drive is preferred
d. Group drive is preferred
Q. A pony motor is used for the starting which of the following motors ?
a. Squirrel cage induction motor
b. Schrage motor
c. Synchronous motor
d. None of the above
Q. ........ has relatively wider range of speed control
a. Synchronous motor
b. Slip ring induction motor
c. Squirrel case induction motor
d. DC shunt motor
Q. Heat control switches are used in
a. Transformers
b. Cooling ranges
c. Three phase induction motors
d. Single face
Q. An elevator Drive is required to operate in
a. One quadrant only
b. Two quadrants
c. Three quadrants
d. Four quadrants
Q. While selecting a motor for air-conditioner the feature of utmost importance is
a. Type of enclosure
b. Type of bearing
c. Noise
d. Power transmission arrangement
Q. Light duty cranes are generally used in
a. Power houses
b. . Pumping stations
c. Auto mobile workshops
d. All of the above
Q. The size of an excavator is usually expressed in terms of
a. Crowd motion
b. m 3
c. Travel in metres
d. Angle of swing
Q. The range of ratings of electric motor used for rolling mills is of the order of
a. 10 to 25 kW
b. 25 to 85 kW
c. 85 to 400 kW
d. 400 to 1000 kW