A Best Way To Crack Gorenment Job Exams

Electrical Engineering Objective Questions { Harmonics }



15.  For measuring positive, negative and zero sequence voltages in a system, the reference is taken as :
A. Neutral of the system only
B. Ground only
C. For zero sequence neutral and for positive and negative the ground
D. None of the above

16. The most economic load on an underground cable is :
A. Greater than its surge loading
B. Less thart the surge loading
C. Equal to the surge loading
D. None of the above is necessary

17.  In case of a 3-phase short circuit is a system, the power fed into the system is :
A. Mostly reactive
B. Mostly active
C. Active and reactive both equal
D. Reactive only

18. If cc is the angle of voltage wave at which an R-L circuit is switched in and 0 is the impedance angle of the R-L circuit, there will be no transient when the circuit is switched in, if:
A. a = 0
B. = 90
C. a = 90 + 0
D. None of the above

19. An RLC series circuit remains predominantly inductive :
A. At resonance frequency
B. Below resonance frequency
C. Above resonance frequency
D. At the lower half power frequency

20. A generator is connected to a synchronous motor. From stability point of view it is preferable to have :
A. Generator neutral reactance grounded and motor neutral resistance grounded
B. Generator and motor neutrals resistance grounded
C. Generator and motor neutrals reactance grounded
D. Generator neutral resistance and motor neutral reactace grounded

21. The positive sequency component of voltage at the point of fault is zero when it is a :
A. 3-phase fault
B. L-L fault
C. L-L-G fault
D. L-G fault

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