Quick Electrical MCQ

1➤ A line from which loads are tapped off is called as

FeederService mainsDistributorBoth B and C

2➤ Buchholz relay is place between the......and the.....

Main tank : bushingsMain tank: oil conservatorCooling tubes: main tankAll of these

3➤ Due to the effect of arc resistance a relay tends to

Overreach ReachDownreach Underreach

4➤ Which of following Y parameter is dimensions less?

Y11None of theseY22Y12

5➤ What is voltage rating of motor with rating upto 180KW

230V765V415VAll of these

6➤ In transformer the transformer oil transfers the heat by

Convection CoductionRadiationCooling fans

7➤ The smaller the lagging reactive power drawn from the circuit

The higher the p.fThe smaller the p.fThere is no change in p.fBoth B and C

8➤ The power which is available under emergency conditions is

Hot reserveCold reserveFirm reserveSpinning reserve

9➤ Which of the following is not a valid method of transistor biasing?

Base resistor methodResistor dividor biasEmitter bias methodNone of these

10➤ The energy in semiconductor

Decrease with temperature Remains constant Increase with temperature Both a and b

11➤ Steel is an alloy of

Copper and zincIron and copperIron and carbon Lead and tin

12➤ In case of liquids ohms law is

Not obyedPartially obyedFully obyedNone of above

13➤ The parallel resonant cicuit magnifies

Current VoltageBoth a and bNone of these

14➤ The impedance at parallel resonance is very large because

Ratio L/C is very largeNone of theseRatio L/C is very largeR is very large

15➤ The difference between two half power frequency is called

Bandwidth Q factorResonant frequency Mid frequency

16➤ The phase sequence of three phase system is RYB the other possible phase sequence can be

RBYBRYYRBAll of these

17➤ A 3 phase load is balanced if all the three phases have the same

Impedance Power factor None of theseBoth a and b

18➤ The advantage of star connected supply system is that

Line current is equal to phase current It is simple arrangement Two voltages can be usedPhase sequence can be easily changed

19➤ The wattmeter measures .......power

Instantenous AverageApparent All of these

20➤ In a 3 phase circuit if load current increase pf will be

DecreaseIncreaseSameAll of these

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