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Electrical Engineering Objective Questions { Harmonics }



36. Shunt compensation in an EHV line is used to improve
A. stability and fault level
B. fault level and voltage profile
C. voltage profile and stability
D. stability, fault level and voltage profile

37. The principal information obtained from load flow studies in a power system are 1. magnitude and phase angle of the voltage at each bus. 2. reactive and real power flows in each of lines. 3. total power loss in the network. 4. Transient stability limit of the system Select the correct answer from the codes given below :
A. I and 2
B. 3 and 4
C. 1,2 and 3
D. 2 and 4

38.  While rising and while falling, if a wave is symmetrical, it contains
A. even harmonics in addition to fundamental
B. odd harmonics in addition to fundamental
C.(b) both odd and even harmonics in addition to fundamental
D. none of the above

39.  While rising and falling if a wave is not symmetrical, it contains
A. even harmonics in addition to fundamental
B. odd harmonics in addition to fundamental
C. both odd and even harmonics in additions to fundamental
D. none of the above

40. The main reason for generation of harmonics in a transformer could be
A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of core

41.  Harmonics in transformer result in
A. increased core losses
B. increased 12R losses
C. magnetic interference with communication circuits
D. all of the above

42.  Which fractional pitch will eliminate the seventh harmonic from the voltage waveform of an alternator?
A. 6/7
B. 7/8
C. 5/6
D. None of the above

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