Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

1 and 3

2 and 3

1 and 2

1 alone

1 and 3

2 and 3

1 and 2

1 alone

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

Cast iron bearings.

Ball bearings.

None of these

Bush bearings.

Cast iron bearings.

Ball bearings.

None of these

Bush bearings.

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Electrical Machines
Short circuiting is caused in the armature winding due to

failure of insulation between two commutator bars.

failure of insulation between two turns of coil.

any of above.

grounding of two or more turns of the same coil.

failure of insulation between two commutator bars.

failure of insulation between two turns of coil.

any of above.

grounding of two or more turns of the same coil.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

cant be determined.

234.76 N-m.

266.20 N-m.

133.22 N-m

cant be determined.

234.76 N-m.

266.20 N-m.

133.22 N-m

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Electrical Machines
The synchronous motor can be started by

providing damper winding in its rotor circuit.

coupling it with a DC compound motor.

any of the above methods.

coupling it with a small AC induction motor called the pony motor.

providing damper winding in its rotor circuit.

coupling it with a DC compound motor.

any of the above methods.

coupling it with a small AC induction motor called the pony motor.

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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

there was no residual magnetism in the field circuit

field resistance was higher than critical resistance

field winding was wrongly connected

there was a break in the armature circuit

there was no residual magnetism in the field circuit

field resistance was higher than critical resistance

field winding was wrongly connected

there was a break in the armature circuit

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Electrical Machines

Electrical Machines Which type of bearing is provided in small induction motors to support the rotor shaft?

Electrical Machines Short circuiting is caused in the armature winding due to

Electrical Machines Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

Electrical Machines The synchronous motor can be started by

Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

Electrical Machines
Short circuiting is caused in the armature winding due to

Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

Electrical Machines
The synchronous motor can be started by

Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because