Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. has relatively wider range of speed control.
a. Synchronous motor
b. Ship ring induction motor
c. Squirrel cage induction motor
d. D.C. shunt motor
Q. In squirrel cage induction motors which of the following methods of starting cannot be used ?
a. Resistance in rotor circuit
b. Resistance in stator circuit
c. Auto-transformer starting
d. Star-delta starting
Q. In which of the following applications the load on motor changes in cyclic order?
a. Electric shovels
b. Cranes
c. Rolling mills
d. All of the above
Q. Flame proof motors are used in
a. paper mills
b. steel mills
c. moist atmospheres
d. explosive atmospheres
Q. Which of the following machines has heavy fluctuation of load ?
a. Printing machine
b. Punching machine
c. Planer
d. Lathe
Q. For derries and winches which of the following drives can be used ?
a. Pole changing squirrel cage motors
b. D.C. motors with Ward-leonard con-trol
c. A.C. slip ring motors with variable resistance
d. Any of the above
Q. Battery operated scooter for braking uses
a. plugging
b. mechanical braking
c. regenerative braking
d. rheostatic braking
Q. The travelling speed of cranes varies 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. Besides a constant speed a synchronous rotor possesses which of the followingadvantages ?
a. Lower cost
b. Better efficiency
c. High power factor
d. All of the above
Q. By the use of which of the followingm D.C. can be obtained from AC?
a. Silicon diodes
b. Mercury arc rectifier
c. Motor generator set
d. Any of the above
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. D.C. motor
Q. Which ofthefollowing motors is preferred when smooth and precise speed control over a wide range is desired ?
a. D.C. motor
b. Squirrel cage induction motor
c. Wound rotor induction motor
d. Synchronous motor
Q. For crane travel which of the following motors is normally used ?
a. Synchronous motor
b. D.C. differentially compound motor
c. Ward-Leonard controlled
d. C. shunt motor
Q. The capacity of a crane is expressed in terms of
a. type of drive
b. span
c. tonnes
d. any of the above
Q. The characteristics of drive for crane hoisting and lowering are which of thefollowing ?
a. Precise control
b. Smooth movement
c. Fast speed control
d. All of the above