Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. Which of the following motors has series characteristics?
a. Shaded Pole motor
b. Repulsion motor
c. Capacitor start motor
d. None of the above
Q. Which of the following motors is preferred for boom host of a travelling crane?
a. Single phase motor
b. Synchronous motor
c. AC slip ring motor
d. Ward Leonard controlled DC shunt motor
Q. For crane travel which off the following motors is normally used?
a. Synchronous motor
b. DC differential compound motor
c. Ward Leonard controlled DC shunt motor
d. AC slip ring motor
Q. Which of the following happens when start Delta starter is used ?
a. Starting voltage is reduced
b. Starting current is reduced
c. None of the above
d. Both A and B
Q. The characteristics of drive for crane hoisting and lowering are which off thefollowing?
a. Precise control
b. Smooth movement
c. Fast speed control
d. All of the above
Q. In ........the speed can be varied by changing the position of brushes
a. Slip ring motor
b. Schrage motor
c. Induction motor
d. Repulsion motor
Q. In which of the following applications variable speed operation is preferred?
a. Exhaust fan
b. Ceiling fan
c. Refrigerator
d. Water pump
Q. The travelling speed of cranes varies from from
a. 20 to 30 m/s
b. 10 to 15 m/s
c. 5 to 10 m/s
d. 1 to 2.5 m/s
Q. Which of the following motors is preferred when quick speed reversal is the mainconsideration?
a. Squirrel cage induction motor
b. Wound rotor induction motor
c. Synchronous motor
d. DC motor
Q. Which off the following motors is preferred when a smooth and resize speed control over a wide range is desired?
a. DC motor
b. Squirrel cage induction motor
c. Wound rotor induction motor
d. Synchronous motor
Q. Which of the following machines has heavy fluctuating of load ?
a. Printing machine
b. Punching machine
c. Planer
d. Lathe
Q. Which of the following motors is usually preferred for kiln drives?
a. Cascade controlled AC motor
b. Slip ring induction motor
c. Three phase shunt wound commutator motor
d. Any of the above
Q. In squirrel cage induction motors which of the following methods of startingcannot be used ?
a. Resistance in rotor circuit
b. Resistance in stator circuit
c. Auto transformer starting
d. Start Delta starting
Q. Electric drive is becoming more and more popular because
a. It is simple, cleaned, compact and reliable
b. It provides easy and smooth control, flexibility in layout, easy starting and facility for remote control
c. It is cheaper in initial as well as in maintenance cost
d. All of the above
Q. The basic elements of an electric drive are
a. Electric motor and the transmission system
b. Electric motor, the transmission and control system
c. The transmission and control system
d. Electric motor and conversion equipment