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AC Circuits Basics Quiz

Total questions: 40

Worksheet time: 13mins

Name
Class
Date
1.

What does AC stand for in electrical engineering?

a)

Alternating Current

b)

Alternating Charge

c)

Alternating Capacitance

d)

Alternating Conductor

e)

Alternating Circuit

2.

The frequency of AC in most household systems is:

Choose multiple correct answers

a)

50 Hz

b)

60 Hz

c)

100 Hz

d)

120 Hz

e)

25 Hz

3.

In an AC circuit, the direction of current flow:

a)

Remains constant

b)

Reverses periodically

c)

Depends on the voltage

d)

Is always from positive to negative

e)

Is random

4.

The phase difference between voltage and current in a purely resistive AC circuit is:

a)

0°

b)

90°

c)

180°

d)

45°

e)

270°

5.

The unit of inductive reactance is:

a)

Ohm

b)

Henry

c)

Farad

d)

Siemens

e)

Volt

6.

In a purely inductive AC circuit, the current:

a)

Leads the voltage by 90°

b)

Lags the voltage by 90°

c)

Is in phase with the voltage

d)

Leads the voltage by 180°

e)

Lags the voltage by 45°

7.

The inductive reactance (X_L) is given by:

a)

X_L = 2 pi f L

b)

X_L = 1/(2 pi f L)

c)

X_L = L/(2 pi f)

d)

X_L = 1/L

e)

X_L = f/(2 pi L)

8.

In a purely capacitive AC circuit, the current:

a)

Leads the voltage by 90°

b)

Lags the voltage by 90°

c)

Is in phase with the voltage

d)

Leads the voltage by 180°

e)

Lags the voltage by 45°

9.

The unit of capacitive reactance is:

a)

Ohm

b)

Henry

c)

Farad

d)

Siemens

e)

Volt

10.

The capacitive reactance (X_C) is given by:

a)

X_C = 2 pi f C

b)

X_C = 1/(2 pi f C)

c)

X_C = C/(2 pi f)

d)

X_C = 1/C

e)

X_C = f/(2 pi C)

11.

The impedance of an AC circuit is represented by:

a)

Z = R + X_L + X_C

b)

Z = sqrt{R^2 + (X_L - X_C)^2}

c)

Z = R + j(X_C - X_L)

d)

All of these

e)

None of these

12.

The power factor of a purely resistive circuit is:

a)

0

b)

1

c)

0.5

d)

0.707

e)

0.866

13.

The power factor of an AC circuit is defined as:

a)

The ratio of resistance to impedance

b)

The ratio of reactance to impedance

c)

The ratio of resistance to reactance

d)

The ratio of impedance to resistance

e)

The ratio of voltage to current

14.

The power factor of a purely inductive circuit is:

a)

0

b)

1

c)

0.5

d)

0.707

e)

0.866

15.

The power dissipated in an inductor in an AC circuit is:

a)

Maximum

b)

Minimum

c)

Zero

d)

Equal to the real power

e)

Equal to the reactive power

16.

The time period of an AC waveform is:

a)

The reciprocal of frequency

b)

The reciprocal of amplitude

c)

The reciprocal of phase angle

d)

The reciprocal of wavelength

e)

The reciprocal of impedance

17.

The peak-to-peak voltage of an AC waveform is:

a)

Twice the peak voltage

b)

Half the peak voltage

c)

Equal to the RMS voltage

d)

Equal to the average voltage

e)

Equal to the DC voltage

18.

The unit of frequency is:

a)

Hertz

b)

Ohm

c)

Farad

d)

Henry

e)

Volt

19.

The unit of capacitance is:

a)

Farad

b)

Ohm

c)

Henry

d)

Hertz

e)

Volt

20.

The unit of inductance is:

a)

Henry

b)

Ohm

c)

Farad

d)

Hertz

e)

Volt

21.

The reactance of an inductor increases with:

a)

Increasing frequency

b)

Decreasing frequency

c)

Increasing resistance

d)

Decreasing resistance

e)

Increasing capacitance

22.

The reactance of a capacitor decreases with:

a)

Increasing frequency

b)

Decreasing frequency

c)

Increasing resistance

d)

Decreasing resistance

e)

Increasing inductance

23.

The phase angle in a purely inductive circuit is:

a)

+90°

b)

-90°

c)

0°

d)

+45°

e)

-45°

24.

The phase angle in a purely capacitive circuit is:

a)

+90°

b)

-90°

c)

0°

d)

+45°

e)

-45°

25.

The voltage across a capacitor in an AC circuit:

a)

Leads the current by 90°

b)

Lags the current by 90°

c)

Is in phase with the current

d)

Leads the current by 180°

e)

Lags the current by 45°

26.

The voltage across an inductor in an AC circuit:

a)

Leads the current by 90°

b)

Lags the current by 90°

c)

Is in phase with the current

d)

Leads the current by 180°

e)

Lags the current by 45°

27.

The power factor of a purely capacitive circuit is

a)

0

b)

1

c)

-1

d)

0.5

e)

0.866

28.

If the phase angle of the admittance of the circuit is positive, it means the circuit is

a)

RL

b)

RC

c)

Purely C

d)

Purely L

e)

RLC

29.

The net susceptance of a RLC series circuit is given by

a)

B_net = B_C - B_L

b)

B_net = B_L - B_C

c)

B_net = B_C + B_L

d)

(B_net)^2 = (B_C)^2 + (B_L)^2

e)

(B_net)^2 = (B_C)^2 - (B_L)^2

30.

In the sinusoid i = I_m sin(377t) A, I_m stands for ________ of the current.

Choose multiple correct answers.

a)

Amplitude

b)

Peak value

c)

Crest value

d)

Maximum value

e)

Highest value

31.

It is that value of the waveform that is dependent on the passage of time.

a)

Instantaneous value

b)

Maximum value

c)

Phasor value

d)

Sinusoidal value

e)

Phase

32.

A half cycle is ________ the altenation.

a)

The same as

b)

Is twice that of

c)

Is half that of

d)

Greater than

e)

Less than

33.

Increasing the frequency of a RL series circuit _______ the value of the impedance.

a)

Increases

b)

Decreases

c)

Does not change

34.

Decreasing the frequency of a RL series circuit______ the value of the impedance.

a)

Increases

b)

Decreases

c)

Does not change

35.

Increasing the frequency of a series RC circuit______ the value of the impedance.

a)

Increases

b)

Decreases

c)

DecreasesDoes not change

36.

Decreasing the frequency of a series RC circuit______ the value of the impedance.

a)

Increases

b)

Decreases

c)

DecreasesDoes not change

37.

Increasing / Decreasing the value of the frequency of a circuit consisting of mulitple resistances _______ the total impedance of the circuit.

a)

Increases

b)

Decreases

c)

Does not change

38.

The phase angle in the admittance is negative. This means the series circuit is

a)

RL

b)

RC

c)

Purely R

d)

All of these

39.

A circuit operates at 60 Hz frequency. Its angular frequency is

a)

60Hz also

b)

314 rad/s

c)

377 rad/s

d)

377 Hz

40.

An incandescent light bulb is operating at 50Hz frequency. It means that the light bulb __________.

a)

Turns on and off 50 times a second

b)

Turns on all the time

c)

Turns on and off 100 times a second

d)

Turns on at positive peak and off at negative peak 100 times a second

e)

Turns on at positive peak and off at negative peak 50 times a second

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