Top 250+ Solved Control of Electric Drives MCQ Questions Answer
Q. A reluctance motor........
a. Is provided with slip rings
b. Requires starting gear
c. Has high cost
d. Is compact
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. In jaw crushers a motor has to often start against....... load
a. Heavy
b. Medium
c. Normal
d. Low
Q. ........has least range of speed control
a. Slip ring induction motor
b. Synchronous motor
c. DC shunt motor
d. Schrage motor
Q. In series motor which of the following methods can be used for changing the fluxper pole?
a. Tapped field control
b. Diverter field control
c. Series-parallel control
d. Any of the above
Q. Which of the following alternatives will be cheaper ?
a. A 100 HP ac three phase motor
b. Four motors of 25 HP each
c. Five motors of 20 HP each
d. 10 motors of 10 HP each
Q. By the use of which of the following DC can be obtained from AC?
a. Silicon diodes
b. Mercury arc rectifier
c. Motor generator set
d. Any of the above
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. Which of the following types of motor and enclosure is safest
a. Totally enclosed
b. Totally enclosed fan cooled
c. Open time
d. Semi closed
Q. Which feature while selecting a motor for centrifugal pump will be of leastsignificance?
a. Starting characteristics
b. Operating speed
c. Horse power
d. Speed control
Q. Which part of a motor needs maximum attention for maintenance?
a. Frame
b. Bearing
c. Stator winding
d. Rotor winding
Q. While selecting an electric motor for a floor Mill, which electrical characteristicswill be of least significance ?
a. Running characteristics
b. Starting characteristics
c. Efficiency
d. Breaking
Q. Which off the following motors is used for elevators?
a. Induction motor
b. Synchronous motor
c. Capacitor start single phase motor
d. Any of the above
Q. ...........is preferred for synthetic fibre mails
a. Synchronous motor
b. Reluctance motor
c. Series motor
d. Shunt motor
Q. For derries and winches which of the following drives can be used ?
a. Pole changing squirrel cage motors
b. DC motors with word Leonard control
c. AC slip rings motors with a variable resistance
d. Any of the above