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Electrical Machines
DC generator will not build up voltage
if it has lost residual magnetism.
any one of above.
if field resistance is more than critical resistance.
due to wrong direction of rotation.
if it has lost residual magnetism.
any one of above.
if field resistance is more than critical resistance.
due to wrong direction of rotation.
Answer
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Related Question
Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as
3 to 5.
1.0.
1.5 to 2.
2 to 3.
3 to 5.
1.0.
1.5 to 2.
2 to 3.
Answer
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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :
2, 3 and 4
1 and 3
1, 2, and 3
1, 2 and 4
2, 3 and 4
1 and 3
1, 2, and 3
1, 2 and 4
Answer
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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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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by
sf / 2.
sf.
f / s.
s2.
sf / 2.
sf.
f / s.
s2.
Answer
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Electrical Machines
Which type of motors uses slip rings?
Induction motors
DC Shunt Motor
Synchronous motors
Both Synchronous and Induction motor
Induction motors
DC Shunt Motor
Synchronous motors
Both Synchronous and Induction motor
Answer
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