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Electrical Engineering Objective Questions { Complex AC }



78.  In a circuit containing R, L and C, power loss can take place in
A. C only
B. L only
C. R only
D. all above

79.  Inductance of coil
A. is unaffected by the supply frequency
B. decreases with the increase in supply frequency
C. increase with the increase in supply frequency
D. becomes zero with the increase in supply frequency

80.  In an A.C. circuit always
A. apparent power is more than actual power
B. reactive power is more than apparent power
C. actual power is more than reactive power
D. reactive power is more than actual power

81.  Which of the following circuit component opposes the change in the circuit voltage?
A. Inductance
B. Capacitance
C. Conductance
D. Resistance

82.  In a purely inductive circuit
A. actual power is zero
B. reactive power is zero
C. apparent power is zero
D. none of above is zero

83.  Power factor of electric bulb is
A. zero
B. lagging
C. leading
D. unity

84.  Pure inductive circuit takes power from the A.C. line when
A. applied voltage decreases but current increases
B. applied voltage increases but current decreases
C. both applied voltage and current in crease
D. both applied voltage and current decrease

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