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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is
18.18% increase
36.36% increase
36.36% increase
36.36% decrease
18.18% increase
36.36% increase
36.36% increase
36.36% decrease
Answer
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Related Question
Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is
2, 3, 4, 5
2, 3 ,5
2, 3, 4
1, 2, 3
2, 3, 4, 5
2, 3 ,5
2, 3, 4
1, 2, 3
Answer
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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?
0.02
0.4
0.04
0.2
0.02
0.4
0.04
0.2
Answer
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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?
In order to not to get saturated.
In order to get saturated.
In order to get more flux.
All of these
In order to not to get saturated.
In order to get saturated.
In order to get more flux.
All of these
Answer
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Electrical Machines
Which of the DC Motor use flywheel?
Series motor.
Cumulatively compound motor.
Differently compared motor.
Shunt motor.
Series motor.
Cumulatively compound motor.
Differently compared motor.
Shunt motor.
Answer
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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.
133.22 N-m
can not be determined.
234.76 N-m.
266.20 N-m.
133.22 N-m
can not be determined.
234.76 N-m.
266.20 N-m.
Answer
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