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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 18°
 30°
 36°

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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
 3.5+j5.8 ohms
 8+j13 ohms
 3.05+j5.08 ohms

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and excitation
 supply voltage, load angle and excitation
 excitation and load angle
 supply voltage and load angle

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thick
 less and thin
 large and thin

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 hysteresis loss
 both 1and 2

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Electrical Machines
Which of the following bearings and their uses are correct

 ball bearings → small machines
 roller bearings → large machines
 both A and B
 neither 1 nor 2

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