A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

3.1 Ω

1.8 9 Ω

1.79 Ω

2 .1 Ω

3.1 Ω

1.8 9 Ω

1.79 Ω

2 .1 Ω

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Electrical Machines
In large sized DC machines the compensating windings are provided to

neutralize voltage induced in coil due to fluctuation of l

None of these

compensate for the decrease in speed due to increase of load.

reduce eddy current losses by providing local short circuits.

neutralize voltage induced in coil due to fluctuation of l

None of these

compensate for the decrease in speed due to increase of load.

reduce eddy current losses by providing local short circuits.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

conduction.

convection.

radiation.

All of these

conduction.

convection.

radiation.

All of these

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

over compounded.

shunt.

differential compounded.

under-compounded.

over compounded.

shunt.

differential compounded.

under-compounded.

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Electrical Machines
The flux involved in the emf equation of a transformer has

maximum value.

average value.

rms value.

total value.

maximum value.

average value.

rms value.

total value.

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Electrical Machines
Dynamic braking is very effective for

series motors.

separately excited motors.

shunt motors.

differential compound motors.

series motors.

separately excited motors.

shunt motors.

differential compound motors.

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Electrical Machines

Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines In large sized DC machines the compensating windings are provided to

Electrical Machines The heat generated in the transformer is dissipated mainly by

Electrical Machines The ___________________ generator has the poorest voltage regulation.

Electrical Machines The flux involved in the emf equation of a transformer has

Electrical Machines Dynamic braking is very effective for

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
In large sized DC machines the compensating windings are provided to

Electrical Machines
The heat generated in the transformer is dissipated mainly by

Electrical Machines
The ___________________ generator has the poorest voltage regulation.

Electrical Machines
The flux involved in the emf equation of a transformer has

Electrical Machines
Dynamic braking is very effective for