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Electrical Engineering Objective Questions { Harmonics }



22. Tick out the correct statement :
A. The negative and zero sequence voltages are maximum at the fault point and decreases towards the neutral
B. The negative and zero sequence voltages are minimum at the fault point and increase towards the neutral
C. The negative sequence is maximum and zero sequence minimum at the fault point and decrease and increase respectively towards the neutral.
D. None of the above

23. The order of the lightning discharge current is :
A. 10,000 amp
B. 100 amp
C. 1 amp
D. 1 microampere

24. The magnetising-inrush-current in a transformer is rich in :
A. 3rd harmonics
B. 5th harmonics
C. 7th harmonics
D. 2nd harmonics

25. The in-rush current of a transformer at no load is maximum if the supply voltage is switched on
A. At zero voltage value
B. At peak voltage value
C. At V/2 value
D. At ,6 /2V value

26.  Pure inductive circuit takes power (reactive) from the a.c. line when
A. both applied voltage and current rise
B. both applied voltage and current decrease
C. applied voltage decreases but current increases
D. (a) and (b)

27.  With 100% series compensation of lines
A. the circuit is series resonant at power frequency
B. low transient voltage
C. high transient current
D. (a) and (b)

28.  In a pure LC parallel circuit under resonance condition, current drawn from the supply mains is
A. very large
B. V ,FTE
C. V /11-j
D.Zero

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