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A.C Fundamentals, Circuits and Circuit Theory Bank PO MCQ...
1.
Calculate the power by two wattmeter (W1 & W2) method, if one of the wattmeter (W2) reading is taken after reversing.
W1 * 2
W1 only
W1 - W2
W1 + W2
2.
What is the line voltage in 3 phase system if the phase voltage is 240V ?
380 Volt
400 Volt
415 Volt
440 Volt
3.
How the low power factor (P.F) can be improve in AC circuit?
By connecting resistance in series.
By connecting capacitor in series.
By connecting inductor in series
By connecting capacitor in parallel
4.
What relationship is illustrated in between the current and voltage?
Current and voltage are "in phase"
Current and voltage are in out of phase
Current lags behind the voltage
Current leads ahead of the voltage
5.
Which AC circuit contains the phase relation between voltage (V) and current (I)?
Pure resistive circuit
Resistance and inductance circuit
Resistance and capacitance circuit
Resistance, inductance and capacitance circuit.
6.
What is the purpose of phase sequence meter?
To control the speed of 3 phase motor.
To protect motor against short circuit fault
To indicate the incorrect phase sequence of 3 phase
To ensure the correct phase sequence of 3 phase system
7.
In which condition resonance will occur in R-L-C series circuit?
Inductive reactance (XL) is zero
Inductive reactance (XL) is equal to capacitive reactance (XC).
Inductive reactance (XL) is greater then capacitive reactance (XC).
Inductive reactance (XL) is less than capacitive reactance (XC).
8.
In which 3 phase system, the artificial neutral is required to measure the phase voltage?
3 wire star connected system
4 wire star connected system
3 wire delta connected system
4 wire delta connected system
9.
Calculate the impedance of the circuit,R = 5 Ohm, XL = 36 Ohm, XC = 24 Ohm
69 Ohm
65 Ohm
13 Ohm
12 Ohm
10.
What is the resistance of the inductive coil takes 5 A current across 240V, 50 Hz supply at 0.8 power factor?
48 Ohm
42.5 Ohm
38.4 Ohm
26.6 Ohm
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