A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

0.72.

0.62.

0.25.

1.24.

0.72.

0.62.

0.25.

1.24.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

T ∝ P.

T is independent of P.

T2 ∝ P3.

T ∝ √P.

T ∝ P.

T is independent of P.

T2 ∝ P3.

T ∝ √P.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

power factor and dc excitation at constant load

All of these

supply voltage and field current at constant excitation

power factor and supply voltage during hunting

power factor and dc excitation at constant load

All of these

supply voltage and field current at constant excitation

power factor and supply voltage during hunting

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

2

1

0

3 or 4

2

1

0

3 or 4

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Electrical Machines
For a 3 - ÃŽÂ¦, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

50, 1500.

1440, 1500.

60, 1440.

60, 1500.

50, 1500.

1440, 1500.

60, 1440.

60, 1500.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

36 W.

28 W.

25 W.

30 W.

36 W.

28 W.

25 W.

30 W.

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Electrical Machines

Electrical Machines A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

Electrical Machines An inverted V-curve of synchronous motor shows the variation of

Electrical Machines Number of slip rings in 3-phase synchronous motor will be

Electrical Machines For a 3 - ÃŽÂ¦, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

Electrical Machines A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

Electrical Machines
For a 3 - ÃŽÂ¦, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be