MCQs on Electric Circuits

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01․ In a 3 - φ delta connection, two-wattmeter method is used to measure the power; if the two watt meters read 28.13 kW and 13.31 kW, the power factor of connection will be
0.85.
0.9.
0.6.
0.4.

02․ In above question, if circuit efficiency is 90 %. What will be output power ?
30 kW.
37.3 kW.
35.6 kW.
40 kW.

Output power = efficiency X ( P1 + P2 ).
03․ Consider the following circuit : Solution Switch is closed at t = 0 Find i(0 +)
0.
(V*L) / (R*C)
V/R.
V / {R + (sL + 1 / Cs)}.

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04․ In question no.3, which of the following is true ?
ic (0+) = i(0+).
i(0+)= iL(0+).
iL(0) = ic (0).
None of these.

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05․ A 10 Ohm resistor has power rating of 1W. Find the maximum current rating.
0.1 A.
0.01 A.
0.316 A.
1 A.

I2R = 1; I = √0.1 = 0.316 A
06․ What would be the power given by source V2? Solution
- 5 W.
5 W.
10 W.
0 W.

Among two voltage source, only 10 V source will deliver power to 5 V voltage source. \
07․ Consider the following circuit. Solution What is the value of i ?
- 5 A.
5 A.
6 A.
12 A.

Voltage source will offer zero resistance path to current. So net current in 1 Ω resistance depends on only voltage source. So current = 5 X i = 5 A.
08․ In above question, power given in the 5 V source is
20 W.
25 W.
30 W.
5 W.

Source current = 5 - 1 = 4 Amp. Power given by the 5 V source = 5 X 4 = 20 W.
09․ Total power consumed in the circuit below is 10 W. Find X.
1 A.
2 A.
3 A.
None of these.

Total power consumed = x2 X 2 + 22/2 ∴ 10 W = 2x2 + 2 Therefore, x = 2 A.
10․ If Vout = 1 V for 1 kHz input then what would be Vout for 10 kHz for same input ? Solution
0.1 V .
0.01 V.
1 V.
None of these.

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