A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

0.95

0.87

1.06

0.96

0.95

0.87

1.06

0.96

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Electrical Machines
In an alternator, voltage drops occurs in

armature resistance, leakage reactance, armature reaction and earth connection.

armature resistance only.

armature resistance and leakage reactance.

armature resistance, leakage reactance and armature reaction.

armature resistance, leakage reactance, armature reaction and earth connection.

armature resistance only.

armature resistance and leakage reactance.

armature resistance, leakage reactance and armature reaction.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

100 V.

800 V.

400 V.

200 V.

100 V.

800 V.

400 V.

200 V.

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Electrical Machines
The ventilating ducts in most of DC machine are

none of these.

radial as well as longitudinal.

radial.

longitudinal.

none of these.

radial as well as longitudinal.

radial.

longitudinal.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

115 V.

460 V.

200 V.

230 V.

115 V.

460 V.

200 V.

230 V.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

V²

f²

V

f

V²

f²

V

f

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Electrical Machines

Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines In an alternator, voltage drops occurs in

Electrical Machines A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

Electrical Machines The ventilating ducts in most of DC machine are

Electrical Machines If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

Electrical Machines In a transformer maximum flux density is not constant, the eddy current loss varies as

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
In an alternator, voltage drops occurs in

Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

Electrical Machines
The ventilating ducts in most of DC machine are

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as