Basic Electrical Engineering MCQ

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Basic Electrical Engineering MCQ_82

SINGLE PHASE AC

Q.196 Inductance L opposes changing in current during _____

1 point

starting interval

transient interval

normal

any of the above

Clear selection

Q.197 apparent power is defined as the

1 point

the product of the rms values of voltage and current

the product of the average values of voltage and current

the product of the maximum values of voltage and current

the product of the instantaneous values of voltage and current

Clear selection

Q.198 The true power is defined as the power equal to the ___.

1 point

power dissipated in ac circuit

power consumed by ac circuit

average power in L circuit

Average power in C circuit

Clear selection

Q.199 The power taken by pure reactance in a circuit is called___

1 point

real power

reactive power

apparent power

reserve power

Clear selection

Q.200 The apparent power is measured in

1 point

VAr

I2R

Clear selection

Q.201which of the following is/are correct for real power?

1 point

real power = EI cos ф

it is expressed in watt

EI sin ф

Both A and B

Clear selection

Q.202 The unit of reactive power is__

1 point

VAR

WAR

Watt hour

Clear selection

Q.203 Reactive power is given by__

1 point

Apparent power x sin ф

Apparent power = EI sin ф

Both A and B

apparent power = EI cos ф

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Q.204 Power factor is defined as

1 point

the ratio of resistance to impedance

cosine of angle between voltage and current

The ratio of real power to apparent power

all of the above

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Q.205 The value of power factor

1 point

always more than unity

can never more than unity

always less than unity

always unity

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Q.206 what are the effect of low power factor?

1 point

low power factors cause greater fall in the terminal voltage

due to low power factor, total current must be increased resulting in increase in resistive losses

low power factor limits the output of the generator and transformer

all of the above

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Q.207 Due to low power factor

1 point

the voltage regulation is greater than unity'

the voltage regulation is less than unity

the voltage regulation is unity

the voltage regulation is infinite

Clear selection

Q.208 what is the effect of lower power factor on efficiency?

1 point

increase

decrease

remains same

efficiency does not depend on power factor

Clear selection

Q.209 due low power factor, high current drawn out by transformer and generator resulting in___

1 point

high out put

temperature rise

efficiency is increase

voltage regulation is decrease

Clear selection

Q.210 The power factor is

1 point

leading

lagging

unity

all of the above and depend on type of load

Clear selection

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