Electrical machine MCQ #7
1) The armature voltage control of dc motor will provide constant
_____.
(a) current drive
(b) torque drive
(c) voltage drive
(d) none of this.
2) The field current control of DC shunt motor will provide constant
______.
(a) current drive
(b) torque drive
(c) voltage drive
(d) HP drive
3) The plugging gives the
(a) Zero torque
breaker
(b) Smallest torque
breaker
(c) Highest torque
breaker
(d) None of them
4) Motor is a machine which converts
(a) Electrical
Energy into Mechanical Energy
(b) Mechanical Energy into
Electrical Energy
(c) Both A&B
(d) None of these
ANSWER: | 1-b | 2-a | 3-c | 4-a |
5) Core Losses are
(a) Eddy Current Loss
(b) Hysteresis
loss
(c) Both A&B
(d) None of these
6) Copper Losses are
(a) Constant Losses
(b) I2R Losses
(c) Both A&B
(d) None of these
7) Slip When Nr=Ns
(a) 0
(b) 1
(c) 0.5
(d) 0.4
8) What is the value of frequency when Ns=1000 RPM, P=6
(a) 30Hz
(b) 50Hz
(c) 40Hz
(d) 60Hz
ANSWER: | 5-c | 6-b | 7-a | 8-b |
9) External Resistance is observed in
(a) Slip Ring
Induction Motor
(b) Squirrel Cage
Induction Motor
(c) Both A&B
(d) None of these
10) The synchronous motor can be made self-starting by providing.
(a) Damper winding on
rotor poles
(b) Damper winding on
stator
(c) (a) or (b)
(d) None of the above
11) Which of the following motors have almost constant speed over
their full load range?
(a) DC series motors
(b) DC shunt motors
(c) Low resistance
squirrel cage motors
(d) (b) and (c) both
12) Which of the following motor one will choose to drive the rotary
compressor?
(a) Universal motor
(b) D.C. series motor
(c) Synchronous Motor
(d) D.C. shunt motor
ANSWER: | 9-a | 10-a | 11-d | 12-c |
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