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Electrical Machines
Which of these types of motor is used in elevators?
DC compound motor.
DC shunt motor.
None of these.
DC series motor.
DC compound motor.
DC shunt motor.
None of these.
DC series motor.
Answer
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Related Question
Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?
2 alone
1, 2 and 3
1 and 2
1 and 3
2 alone
1, 2 and 3
1 and 2
1 and 3
Answer
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Electrical Machines
Armature reaction in a DC machine
is in the same direction as the main poles.
is in direct opposition to the main poles.
makes an angle of 90° with the main pole axis.
makes an angle with the main pole axis which is load dependent.
is in the same direction as the main poles.
is in direct opposition to the main poles.
makes an angle of 90° with the main pole axis.
makes an angle with the main pole axis which is load dependent.
Answer
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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?
Yoke.
Brush.
Armature.
Commutator.
Yoke.
Brush.
Armature.
Commutator.
Answer
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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is
440 A.
40 A.
400 A.
44 A.
440 A.
40 A.
400 A.
44 A.
Answer
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Electrical Machines
Dynamic braking is very effective for
separately excited motors.
differential compound motors.
shunt motors.
series motors.
separately excited motors.
differential compound motors.
shunt motors.
series motors.
Answer
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