ELEC 07001

A coil with a resistance of 50 Ohms and an inductance of 1.5 Henrys is connected to a 60 Hz supply. What is the inductive reactance of the coil?

• 565.2 Ohms

• 628 Ohms

• 471.2 Ohms

• 376.8 Ohms

In a series RLC circuit, if the capacitive reactance is increased, what happens to the total impedance?

• Increases

• Decreases

• Remains the same

• Becomes zero

Two capacitors of 10 µF and 20 µF are connected in series. What is the total capacitance of the circuit?

• 6.67 µF

• 10 µF

• 15 µF

• 30 µF

What is the formula for calculating the total capacitive reactance in a parallel AC circuit?

• XCT = XC1 + XC2 + XC3 + ...

• XCT = 1 / (XC1 + XC2 + XC3 + ...)

• 1/XCT = 1/XC1 + 1/XC2 + 1/XC3 + ...

• XCT = XC1 × XC2 × XC3 × ...

A series circuit has two resistors, R1 = 30 Ohms and R2 = 50 Ohms, connected across a 120 V, 60 Hz supply. What is the total power dissipation?

• 144 W

• 180 W

• 240 W

• 360 W

When two resistors are connected in parallel to an AC supply, how is the total impedance calculated?

• Z = R1 + R2

• Z = 1 / (1/R1 + 1/R2)

• Z = E / IT

• Z = R1 × R2

What is the effect of connecting a capacitor in parallel with a single-phase motor?

• Decreased power factor

• Increased power factor

• No change in power factor

• Increased inductive reactance

What is the primary purpose of power factor correction in an electrical system?

• Increase line losses

• Reduce line losses

• Increase reactive power

• Decrease real power

Three capacitors of 12 µF, 24 µF, and 36 µF are connected in series. What is the total capacitance of the circuit?

• 6.0 µF

• 7.2 µF

• 8.4 µF

• 9.6 µF

In a series RLC circuit, if the inductive reactance is greater than the capacitive reactance, what is the phase relationship between current and voltage?

• Current leads voltage

• Current lags voltage

• Current and voltage are in phase

• Current and voltage are 180° out of phase