Electrical Machines Losses Efficiency Online Exam Quiz
Electrical Machines Losses Efficiency GK Quiz. Question and Answers related to Electrical Machines Losses Efficiency. MCQ (Multiple Choice Questions with answers about Electrical Machines Losses Efficiency
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 with _________
Options
A : closed circuit air cooling
B : hydrogen gas
C : direct water
D : all 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
A peaky voltage supply is given to the 3 phase power transformer of the connection power system. These results in _________
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
A three phase induction motor is connected to the infinite bus operating at the normal conditions. There occurs an unbalancing in the supply, leading to _________
Options
A : unequal heating losses
B : stopping of motor
C : increase in lower
D : none of the mentioned
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