Related Questions

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -
A 5 : 8
B 10 : 9
C 8 : 5
D 9 : 10
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 increase
D Both applied voltage and current decrease
In a pure inductive circuit
A The current is in phase with the voltage
B The current lags behind the voltage by 90°
C The current leads the voltage by 90°
D The current can lead or lag by 90°
In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.
A True
B False
Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.
A True
B False
Which one of the following phrases most accurately describes a purely inductive circuit?
A Resistances provide the only opposition to current flow
B Inductive reactance provides the only opposition to current flow
C Combinations of resistance and inductive reactance provide any opposition to current flow
D The ac voltage lags the current by 90 degree
E None of the above
For a purely inductive circuit which of the following is true?
A Apparent power is zero
B Relative power is zero
C Actual power of the circuit is zero
D Any capacitance even if present in the circuit will not be charged
Time constant of an inductive circuit
A Increases with increase of inductance and decrease of resistance
B Increases with the increase of inductance and the increase of resistance
C Increases with the decrease of inductance and decrease of resistance
D Increases with decrease of inductance and increase of resistance
Power factor of an inductive circuit is usually improved by connecting capacitor to it in
A Parallel
B Series
C Either A or B
D None of the above
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

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