Electrical Machines Online Test Online Exam Quiz
Electrical Machines Online Test GK Quiz. Question and Answers related to Electrical Machines Online Test. MCQ (Multiple Choice Questions with answers about Electrical Machines Online Test
For the given traction application using a dc series motor for a starting time ’t’ is applied. If this method is replaced by a series-parallel control, giving 50% time for each series and parallel. The saving in the starting energy of ____________
Options
A : 25%
B : zero
C : 50%
D : 75%
The hydroelectric plants in the industry are best suited to ____________
Options
A : closed circuit air cooling
B : hydrogen gas
C : direct water
D : any of the mentioned
If one of the phases of the supply breaks down, then the connected three phase induction motor ____________
Options
A : continues to run as a single phase induction motor, provided load does does not increase beyond 57.7%
B : stops operating after few seconds
C : continues to run as single phase induction motor
D : continues to run as two phase induction motor
In dc machine iron losses cause ____________
Options
A : heating in core
B : loss in efficiency
C : rise in temperature of ventilating air
D : all of the mentioned
If two series motors are identically coupled. One is running as motor while other as generator. For this combination, the iron losses and frictional losses are found identical for ____________
Options
A : identical speed and excitation
B : identical speed
C : identical rating and construction
D : none of the mentioned
Hysteresis loss in a dc machine is _____ of rate of flow of air and _____ on frequency of _____
Options
A : independent, dependent, magnetic reversal
B : independent, dependent, operation
C : dependent, independent, magnetic reversal
D : none of the mentioned
A peaky voltage supply is given to the 3 phase power transformer of the connection power system. These results into ____________
Options
A : reduction in iron losses
B : reduction in copper losses
C : increase in iron losses
D : reduction in noise
If one of the phases of RYB supply gets broken, then the temperature rise of the induction motor ____________
Options
A : remains same as before
B : reduces as compared to the normal operating temperature
C : reduces to temperature rise of corresponding single phase induction motor
D : increases
For squirrel cage and slip ring induction motor, cooling methods is efficient in ____________
Options
A : squirrel cage induction motor
B : slip ring induction motor
C : both of the motors
D : none of the mentioned
The iron losses in a saturated three phase alternator is lesser than the non-saturated three phase alternator.
Options
A : True
B : False
C :
D :
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