Inductance of a coil Varies__________?
(A) directly as the cross-sectional area of magnetic core
(B) directly as square of number of turns
(C) directly as the permeability of the core
(D) inversely as the length of the iron path
(D) as
In a highly capacitive circuit the__________?
(A) apparent power is equal to the actual power
(B) reactive power is more than the apparent power
(C) reactive power is more than the actual power
(D) actual power is more than its reactive power
The product of apparent power and cosine of the phase angle between circuit voltage and current is
(A) true power
(B) reactive power
(C) volt-amperes
(D) instantaneous power
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
(A) the capacitive reactance in ohms
(B) the current flowing in capacitor
(C) the size of the capacitor being quite big
(D) the statement is incorrect
When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
(A) apparent power
(B) true power
(C) reactive power
(D) none of the above
In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?
(A) 220 V
(B) 220V3V
(C) 220/V3 V
(D) none of the above
The power factor at resonance in R-L- C parallel circuit is________?
(A) zero
(B) 0.08 lagging
(C) 0.8 leading
(D) unity
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 the case of an unsymmetrical alternating current the average value must always be taken over__________?
(A) unsymmetrical part of the wave form
(B) the quarter cycle
(C) the half cycle
(D) the whole cycle
The transient currents are associated with the____________?
(A) changes in the stored energy in the inductors and capacitors
(B) impedance of the circuit
(C) applied voltage to the circuit
(D) resistance of the circuit