A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

44.47 Amp.

33.33 Amp.

29 Amp.

43 Amp.

44.47 Amp.

33.33 Amp.

29 Amp.

43 Amp.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

1, 4

2, 4

1, 3

2, 3

1, 4

2, 4

1, 3

2, 3

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Electrical Machines
The rotor speed of an induction motor is given by

Nr = 120f / p Ãƒâ€” (1-s).

Ns = 120f /p Ãƒâ€” ( 1 - r).

Ns = 120f / p Ãƒâ€” ( 1 - s ).

None of these

Nr = 120f / p Ãƒâ€” (1-s).

Ns = 120f /p Ãƒâ€” ( 1 - r).

Ns = 120f / p Ãƒâ€” ( 1 - s ).

None of these

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Electrical Machines
Flashing of DC generator means

creation of residual magnetism by a DC source.

neutralization of residual magnetism.

increasing flux density by providing extra ampere-turns in field.

None of these

creation of residual magnetism by a DC source.

neutralization of residual magnetism.

increasing flux density by providing extra ampere-turns in field.

None of these

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

It will becomes four times.

It will be doubled.

It will be halved.

It will remain the same.

It will becomes four times.

It will be doubled.

It will be halved.

It will remain the same.

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Electrical Machines
In a DC compound motor the field regulator is provided to

demagnetize the field partially.

limit the armature current.

control the armature flux.

control the field flux.

demagnetize the field partially.

limit the armature current.

control the armature flux.

control the field flux.

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Electrical Machines

Electrical Machines A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines The rotor speed of an induction motor is given by

Electrical Machines Flashing of DC generator means

Electrical Machines If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

Electrical Machines In a DC compound motor the field regulator is provided to

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines
The rotor speed of an induction motor is given by

Electrical Machines
Flashing of DC generator means

Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

Electrical Machines
In a DC compound motor the field regulator is provided to