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

3.5+j5.8 ohms

3.05+j5.08 ohms

8+j13 ohms

53+j85 ohms

3.5+j5.8 ohms

3.05+j5.08 ohms

8+j13 ohms

53+j85 ohms

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

DC compound motor.

DC shunt motor with field weaking control.

DC shunt motor with armature resistance.

DC series motor.

DC compound motor.

DC shunt motor with field weaking control.

DC shunt motor with armature resistance.

DC series motor.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

Paraffin based insulating oil.

Olefin based insulating oil.

Aromatics based insulating oil.

Naphtha based insulating oil.

Paraffin based insulating oil.

Olefin based insulating oil.

Aromatics based insulating oil.

Naphtha based insulating oil.

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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

Connecting an additional resistance in stator circuit.

Connecting an additional resistance in the armature circuit.

Any of the above.

Connecting an additional resistance in the field circuit.

Connecting an additional resistance in stator circuit.

Connecting an additional resistance in the armature circuit.

Any of the above.

Connecting an additional resistance in the field circuit.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

somewhat less than 220 V

220 V

6 V

more than 220 V

somewhat less than 220 V

220 V

6 V

more than 220 V

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

V²

V

f²

f

V²

V

f²

f

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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 Which of the following DC Motor uses 4-point starter?

Electrical Machines Which of the following transformer insulating oil generally used in India?

Electrical Machines In speed control of DC Series motor, speed lower than the rated speed can be obtained by

Electrical Machines A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as

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
Which of the following DC Motor uses 4-point starter?

Electrical Machines
Which of the following transformer insulating oil generally used in India?

Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as