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Electrical Engineering Objective Questions { Complex AC }

106.  All definitions of power factor of a series R-L-C circuit are correct except
A. ratio of net reactance and impedance
B. ratio of kW and kVA
C. ratio of R and Z
D. ratio of W and VA

107.  The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is
A. 4 kVAR
B.(1)6 kVAR
C. 8 kVAR
D. 16 kVAR

108.  The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 a If the frequency is increased to 100 Hz, reactance becomes
A. 5 SI
B. 10 S/
C. 15 S2

109.  What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?
A. 0?

110.  The purpose of a parallel resonance is to magnify
A. current
B. voltage
C. power
D. frequency

111.  In an A.C. circuit power is dissipated
A. resistance only
B. inductance only in
C. capacitance only (d) none of the above

112.  In a parallel R-C circuit, the curent always the applied voltage
A. lags
B. leads
C. remains in phase with
D. none of the above

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