A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

15.28 Nm

15.92 Nm

15.6 Nm

16.55 Nm

15.28 Nm

15.92 Nm

15.6 Nm

16.55 Nm

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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
A 3 - ÃŽÂ¦, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

1920 Watt.

1960 Watt.

980 Watt.

1800 Watt.

1920 Watt.

1960 Watt.

980 Watt.

1800 Watt.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

Kef2KfBm2.

Kef2Kf2Bm2.

KefKf2Bm2.

Kef2Kf2Bm.

Kef2KfBm2.

Kef2Kf2Bm2.

KefKf2Bm2.

Kef2Kf2Bm.

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Electrical Machines
Which of the following statements is/are correct statements?

EMF per turn in HV winding is more than EMF per turn in LV winding

All of these

EMF per turn in both the windings are equal

EMF per turn in HV winding is less than EMF per turn in LV winding

EMF per turn in HV winding is more than EMF per turn in LV winding

All of these

EMF per turn in both the windings are equal

EMF per turn in HV winding is less than EMF per turn in LV winding

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

15.30%.

16.67%.

14.28%.

18.25%.

15.30%.

16.67%.

14.28%.

18.25%.

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Electrical Machines

Electrical Machines A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, 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

Electrical Machines A 3 - ÃŽÂ¦, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

Electrical Machines If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

Electrical Machines Which of the following statements is/are correct statements?

Electrical Machines The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, 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

Electrical Machines
A 3 - ÃŽÂ¦, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

Electrical Machines
Which of the following statements is/are correct statements?

Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?