EE101

Class_04/11/2026

EE101

If the frequency of an AC supply is doubled, the inductive reactance becomes

1: If the frequency of an AC supply is doubled, the inductive reactance becomes

Half

Double

Four times

Unchanged

A series RLC circuit has Xₗ = 20 Ω and Xc = 30 Ω. The circuit behaves as

2: A series RLC circuit has Xₗ = 20 Ω and Xc = 30 Ω. The circuit behaves as

Resistive

Inductive

Capacitive

At resonance

A series RLC circuit has R = 8 Ω, Xₗ = 15 Ω and Xc = 9 Ω. What is the impedance magnitude

3: A series RLC circuit has R = 8 Ω, Xₗ = 15 Ω and Xc = 9 Ω. What is the impedance magnitude

10 Ω

32 Ω

14 Ω

17 Ω

A load consumes 800 W at a power factor of 0.8. What is its apparent power

4: A load consumes 800 W at a power factor of 0.8. What is its apparent power

800 VA

1000 VA

640 VA

1200 VA

In a purely capacitive AC circuit, the average active power consumed is

5: In a purely capacitive AC circuit, the average active power consumed is

Equal to apparent power

Maximum

Equal to reactive power

Zero

A series RL circuit has R = Xₗ. What is the phase angle between supply voltage and current

6: A series RL circuit has R = Xₗ. What is the phase angle between supply voltage and current

30° lagging

90° lagging

45° lagging

45° leading

A load draws 5 kVA apparent power and consumes 3 kW active power. What are its reactive power magnitude and power facto

7: A load draws 5 kVA apparent power and consumes 3 kW active power. What are its reactive power magnitude and power facto

4 kVAR, 0.6

3 kVAR, 0.8

4 kVAR, 0.8

2 kVAR, 0.6

In a series RL circuit supplied with constant RMS voltage, frequency is increased while R and L remain constant. The active power:

8: In a series RL circuit supplied with constant RMS voltage, frequency is increased while R and L remain constant. The active power:

Increases

Becomes zero immediately

Remains unchanged

Decreases

A series RLC circuit has a leading power factor of 0.8. Which statement is correct

9: A series RLC circuit has a leading power factor of 0.8. Which statement is correct

Xₗ < Xc and Q > 0

Xₗ < Xc and Q < 0

Xₗ > Xc and Q < 0

Xₗ = Xc and Q = 0

Which of the following household appliances draws negligible reactive power?

10: Which of the following household appliances draws negligible reactive power?

Ceiling fan

Air conditioner

Washing machine

Incandescent light bulb