Basic Electrical Engineering MCQ

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Basic Electrical Engineering MCQ_78

Single phase AC

Q.136 To draw phasor diagram of a.c circuit consists of R, L, C. which of the following is taken as reference value?

1 point

voltage value

current value

power

depend upon circuit parameter like R,L,C

Clear selection

Q.137 what is the phase difference between voltage and current of purely inductive circuit?

1 point

45º

90º

180º

0º

Clear selection

Q.138 In purely inductive circuit the voltage _____ or current __

1 point

leads the current by 90º, leads by voltage by 90º

lags behind the current by90º, current lags behind by 90º

leads the current by 90º, lags behind the voltage by 90º

lags behind the current by 90º, leads the voltage by 90º

Clear selection

Q.139 what is the power factor of a.c circuit of purely inductive?

1 point

leading

lagging

unity

Fluctuate between leading and lagging

Clear selection

Q.140 The opposition of inductance to flow of alternating current is known as__

1 point

induced emf

inductance

inductive reactance

impedance

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Q.141 The inductive reactance is the ratio of the ___

1 point

rms value of voltage to rms value of current in inductive circuit

rms value of current to rms value of voltage in inductive circuit

average value of voltage to rms value of current in inductive circuit

rms value of current to maximum value of voltage in inductive circuit

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Q.142 which of the following is/are correct for inductive reactance?

1 point

it is denoted by the symbol XL

It is measured in ohms

It is written as ωL = V/I

all of the above

Clear selection

Q.143 Following equation gives the relation of Ohm’s law for purely inductive circuit.

1 point

V = XI

V = X/I

V = XLI

I = XLV

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Q.144 The voltage drop across the inductance L is called __ and it is given by__.

1 point

reactive voltage, Vx

inductive voltage, VL

resistive voltage, Vr

none of the above

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Q.145 Calculate inductive reactance at 1.5 MHz of coil has an inductive reactance of 25 mH and negligible resistance.

1 point

235600 ohm

235.60 ohm

23560.00 ohm

2356.00 ohm

Clear selection

Q.146 The reactance offered by inductance to pure dc voltage of current__

1 point

infinity

zero

tends to zero

negative

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Q.147 A pure inductor is equivalent to a ____ for a direct current or voltage.

1 point

short circuit

open circuit

A or B

not defined

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Q.148 The average power consumed or supplied to a pure inductor connected in ac circuit is__

1 point

infinite

zero

depend on connected inductive load

depend upon time duration of connected load

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Q.149 why average power in pure inductive circuit is zero?

1 point

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

The area under the positive parts and those under the negative parts of the power waveform are exactly equal

total energy supply to a pure inductance over a complete cycle is zero

all of the above

Clear selection

Q.150 Impedance of purely inductive circuit is expressed by__

1 point

Z = R + jX

Z = jX

Z = R

Z = jX + R

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