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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