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Electrician Set-2
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17

AC circuits MCQ with Answers

17) Calculate the apparent power of a star connected 3 phase load, if it is connected across 3 phase 415volt/50Hz supply at 0.8 p.f and the phase current is 10 Amps

12.45 KVA

57.50 KVA

3.320 KVA

7.188 KVA

Answer is:

7.188 KVA

AC circuits MCQ with Answers

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18) What is the P.F if one of the wattmeters reading is zero and the other reads total power in 2 wattmeter method of 3 phase power measurement?

0.5

Zero

Unity

Below 0.5

Answer is:

0.5

19) Which electrical term is defined as the total opposition to current in AC parallel circuit?

Resistance

Impedance

Admittance

Susceptance

Answer is:

Impedance

Explanation:

Impedance (symbol Z) is a measure of the overall opposition of a circuit to current, in other words: how much the circuit impedes the flow of charge. It is like resistance, but it also takes into account the effects of capacitance and inductance. Impedance is measured in ohms.

20) In a 3 phase system, if the active power is 4 kw and the apparent power is 5 KVA, calculate the reactive power?

1 KVAR

2 KVAR

3 KVAR

4 KVAR

Answer is:

3 KVAR

21) In which condition resonance will occur in R-LC series circuit?

Inductive reactance (XL) is zero

Inductive reactance (XL) is equal to capacitive reactance (XC)

Inductive reactance (XL) is greater than capacitive reactance (XC)

Inductive reactance (XL) is less than capacitive reactance (XC)

Answer is:

Inductive reactance (XL) is equal to capacitive reactance (XC)

AC circuits MCQ with Answers

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17) Calculate the apparent power of a star connected 3 phase load, if it is connected across 3 phase 415volt/50Hz supply at 0.8 p.f and the phase current is 10 Amps

7.188 KVA

AC circuits MCQ with Answers

Related AC circuits MCQ with Answers

18) What is the P.F if one of the wattmeters reading is zero and the other reads total power in 2 wattmeter method of 3 phase power measurement?

0.5

19) Which electrical term is defined as the total opposition to current in AC parallel circuit?

Impedance

20) In a 3 phase system, if the active power is 4 kw and the apparent power is 5 KVA, calculate the reactive power?

3 KVAR

21) In which condition resonance will occur in R-LC series circuit?

Inductive reactance (XL) is equal to capacitive reactance (XC)

AC circuits MCQ with Answers