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

1.79 Ω

1.8 9 Ω

2 .1 Ω

3.1 Ω

1.79 Ω

1.8 9 Ω

2 .1 Ω

3.1 Ω

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Electrical Machines
Reactive power generated or delivered significantly depends on

load angle.

excitation.

both 1 and 2.

frequency.

load angle.

excitation.

both 1 and 2.

frequency.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

same

None of these

either of these

exactly opposite

same

None of these

either of these

exactly opposite

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Electrical Machines
Which 1 - ÃŽÂ¦ motor does operate at high power factor?

Capacitor run.

Capacitor start.

Split phase.

Shaded pole.

Capacitor run.

Capacitor start.

Split phase.

Shaded pole.

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Electrical Machines
On what factors the speed of dc motor depends?

All of these.

Field flux.

Armature current Ia.

Applied voltage.

All of these.

Field flux.

Armature current Ia.

Applied voltage.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

1600 W and 5000 W

1600 W and 1250 W

3200 W and 5200 W

3200 W and 2500 W

1600 W and 5000 W

1600 W and 1250 W

3200 W and 5200 W

3200 W and 2500 W

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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 Reactive power generated or delivered significantly depends on

Electrical Machines Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

Electrical Machines Which 1 - ÃŽÂ¦ motor does operate at high power factor?

Electrical Machines On what factors the speed of dc motor depends?

Electrical Machines The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

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
Reactive power generated or delivered significantly depends on

Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

Electrical Machines
Which 1 - ÃŽÂ¦ motor does operate at high power factor?

Electrical Machines
On what factors the speed of dc motor depends?

Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?