A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

53+j85 ohms

8+j13 ohms

3.5+j5.8 ohms

3.05+j5.08 ohms

53+j85 ohms

8+j13 ohms

3.5+j5.8 ohms

3.05+j5.08 ohms

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Electrical Machines
What is the full form of MNP?

Magnetic field neutral plane.

Magnetic field neutral pole.

Magnetic neutral plane.

Magnetic neutral pole.

Magnetic field neutral plane.

Magnetic field neutral pole.

Magnetic neutral plane.

Magnetic neutral pole.

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Electrical Machines
Which of the following induction motor has maximum speed?

4 pole.

6 pole.

2 pole.

8 pole.

4 pole.

6 pole.

2 pole.

8 pole.

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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 ?

16.67%.

18.25%.

15.30%.

14.28%.

16.67%.

18.25%.

15.30%.

14.28%.

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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

1, 2, and 3

2, 3 and 4

1 and 3

1, 2 and 4

1, 2, and 3

2, 3 and 4

1 and 3

1, 2 and 4

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

27.73 Nm .

65.8 Nm.

74 Nm.

38.5 Nm.

27.73 Nm .

65.8 Nm.

74 Nm.

38.5 Nm.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

Electrical Machines What is the full form of MNP?

Electrical Machines Which of the following induction motor has maximum speed?

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 When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

Electrical Machines
What is the full form of MNP?

Electrical Machines
Which of the following induction motor has maximum speed?

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
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.