AC CIRCUITS - Practice Mode

1) 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)

Correct Answer: Inductive reactance (XL) is equal to capacitive reactance (XC)

2) How will you obtain positive reading in the wattmeter reads negative reading during 3- phase two wattmeter method?

By interchanging the connections of input terminals By disconnecting the connection of current coil in meter By reversing the connection of pressure coil in meter By reversing the pressure coil and current coil connection in meter

Correct Answer: By reversing the connection of pressure coil in meter

3) What is the form factor (Kf) for sinusoidal AC?

1 1.11 2.22 4.44

Correct Answer: 1.11

4) What is the reciprocal of inductance in AC parallel circuit?

Reactance Admittance Conductance Susceptance

Correct Answer: Susceptance

5) Calculate the total power by two wattmeter (W1 & W2) method, if one of the wattmeter (W2) reading is taken after reversing.

W1 x 2 W1 only W1 - W2 W1 + W2

Correct Answer: W1 - W2

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