Q.136 To draw phasor diagram of a.c circuit consists of R, L, C. which of the following is taken as reference value?
A. voltage value
B. current value
C. power
D. depend upon circuit parameter like R, L or C
Ans.: D
Q.137 what is the phase difference between voltage and current of purely inductive circuit?
A. 45º
B. 90º
C. 180º
D. 0º
Ans.: B
Q.138 In purely inductive circuit the voltage _____ or current __
A. leads the current by 90º, leads by voltage by 90º
B. lags behind the current by90º, current lags behind by 90º
C. leads the current by 90º, lags behind the voltage by 90º
D. lags behind the current by 90º, leads the voltage by 90º
Ans.: C
Q.139 what is the power factor of a.c circuit of purely inductive?
A. leading
B. lagging
C. unity
D. fluctuate between leading and lagging
Ans.: B
Q.140 The opposition of inductance to flow of alternating current is known as__
A. induced emf
B. inductance
C. inductive reactance
D. impedance
Ans.: C
Q.141 the inductive reactance is the ratio of the ___
A. rms value of voltage to rms value of current in inductive circuit
B. rms value of current to rms value of voltage in inductive circuit
C. average value of voltage to rms value of current in inductive circuit
D. rms value of current to maximum value of voltage in inductive circuit
Ans.: A
Q.142 which of the following is/are correct for inductive reactance?
A. it is denoted by the symbol XL
B. It is measured in ohms
C. It is written as ωL = V/I
D. All of the above
Ans.: D
Q.143 Following equation gives the relation of Ohm’s law for purely inductive circuit.
A. V = XI
B. V = X/I
C. V = XLI
D. I = XLV
Ans.: C
Q.144 The voltage drop across the inductance L is called __ and it is given by__.
A. reactive voltage, Vx
B. inductive voltage, VL
C. resistive voltage, Vr
D. none of the above
Ans.: B
Q.145 Calculate inductive reactance at 1.5 MHz of coil has an inductive reactance of 25 mH and negligible resistance.
A. 235600 ohm
B. 235.60 ohm
C. 23560.00 ohm
D. 2356.00 ohm
Ans.: A
Q.146 The reactance offered by inductance to pure dc voltage of current__
A. infinity
B. zero
C. tends to zero
D. negative
Ans.: B
Q.147 A pure inductor is equivalent to a ____ for a direct current or voltage.
A. short circuit
B. open circuit
C. A or B
D. not defined
Ans.: A
Q.148 The average power consumed or supplied to a pure inductor connected in ac circuit is__
A. infinite
B. zero
C. depend on connected inductive load
D. depend upon time duration of connected load
Ans.: B
Q.149 why average power in pure inductive circuit is zero?
A. In the positive half cycle of power waveform, energy is stored by the inductance and in the negative half cycle of the power waveform, the stored energy is returned back to the ac source
B. The area under the positive parts and those under the negative parts of the power waveform are exactly equal
C. total energy supply to a pure inductance over a complete cycle is sero
D. all of the above
Ans.: D
Q.150 Impedance of purely inductive circuit is expressed by__
A. Z = R + jX
B. Z = jX
C. Z = R
D. Z = jX + R
Ans.: B
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