The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

48.0%.

88.8%.

59.2%.

57.1%.

48.0%.

88.8%.

59.2%.

57.1%.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

American standard association method

MMf method

ZPF method

Synchronous impedance method

American standard association method

MMf method

ZPF method

Synchronous impedance method

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Electrical Machines
The field system of an alternator is usually excited

3 - ÃŽÂ¦, 50 Hz and 400 V.

230 V AC.

250 / 250 V DC.

110 / 220 V AC.

3 - ÃŽÂ¦, 50 Hz and 400 V.

230 V AC.

250 / 250 V DC.

110 / 220 V AC.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

zero.

unity.

lagging.

leading.

zero.

unity.

lagging.

leading.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

increased.

kept constant to certain value.

decreased.

remains same.

increased.

kept constant to certain value.

decreased.

remains same.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

Reduce starting torque.

Reduce armature heating.

Increase speed

Increase acceleration duration.

Reduce starting torque.

Reduce armature heating.

Increase speed

Increase acceleration duration.

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Electrical Machines

Electrical Machines The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

Electrical Machines Which of the following voltage regulation method is accurate ?

Electrical Machines The field system of an alternator is usually excited

Electrical Machines When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

Electrical Machines In a seperately excited DC Motor if field current is increased, it will

Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

Electrical Machines
Which of the following voltage regulation method is accurate ?

Electrical Machines
The field system of an alternator is usually excited

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

Electrical Machines
In a seperately excited DC Motor if field current is increased, it will