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Worksheets

002300 PAPER

Total questions: 68

Worksheet time: 37mins

Name
Class
Date
1.

What does RMS stand for in AC circuits?

a)

Real Mean Signal

b)

Root Mean Square

c)

Relative Mean Standard

d)

Resistance Measurement Scale

2.

What is the formula for frequency in terms of periodic time?

a)

f = T

b)

f = 2T

c)

f = 1/T

d)

f = T/2

3.

What is the unit of frequency?

a)

Volt

b)

Ampere

c)

Hertz

d)

Ohm

4.

What is the peak value of a 230V (rms) AC voltage?

a)

115V

b)

325V

c)

230V

d)

460V

5.

Which instrument is used to display an AC signal waveform?

a)

Voltmeter

b)

Ammeter

c)

Oscilloscope

d)

Ohmmeter

6.

What is the formula for capacitive reactance XC?

a)

XC = 2πfC

b)

XC = 1/2πfC

c)

XC = f/C

d)

XC = C/f

7.

In a capacitive circuit, current leads voltage by:

a)

0°

b)

45°

c)

90°

d)

180°

8.

In an inductive circuit, current lags voltage by:

a)

0°

b)

45°

c)

90°

d)

180°

9.

What is the formula for inductive reactance XL?

a)

XL = 2πfL

b)

XL = 1/2πfL

c)

XL = f/L

d)

XL = L/f

10.

What is the unit of inductive reactance?

a)

Farad

b)

Volt

c)

Ohm

d)

Coulomb

11.

What is the formula to calculate RMS voltage from peak voltage?

a)

Vrms = 0.5 × Vp

b)

Vrms = 0.707 × Vp

c)

Vrms = 1.414 × Vp

d)

Vrms = Vp / 2

12.

What is the peak-to-peak value of a waveform with a peak value of 100V?

a)

50V

b)

70.7V

c)

200V

d)

141.4V

13.

Which of the following is true for capacitors in series?

a)

Voltage is the same across all capacitors

b)

Total capacitance is the sum of individual capacitances

c)

Total capacitance is less than the smallest individual capacitor

d)

Charge is different across each capacitor

14.

Which formula is used to calculate total capacitance in series?

a)

Ct = C1 + C2 + C3

b)

1/Ct = 1/C1 + 1/C2 + 1/C3

c)

Ct = C1 × C2 × C3

d)

Ct = C1 - C2 + C3

15.

Which formula is used to calculate total capacitance in parallel?

a)

Ct = C1 + C2 + C3

b)

1/Ct = 1/C1 + 1/C2 + 1/C3

c)

Ct = C1 × C2 × C3

d)

Ct = C1 - C2 + C3

16.

In a parallel capacitor circuit, what remains constant across all capacitors?

a)

Charge

b)

Capacitance

c)

Voltage

d)

Resistance

17.

In a series capacitor circuit, what remains constant across all capacitors?

a)

Voltage

b)

Charge

c)

Capacitance

d)

Resistance

18.

What is the unit of capacitance?

a)

Volt

b)

Ohm

c)

Farad

d)

Ampere

19.

What happens to inductance when inductors are connected in series?

a)

It decreases

b)

It remains the same

c)

It increases

d)

It becomes zero

20.

What is the formula for total inductance in series?

a)

Lt = L1 + L2 + L3

b)

1/Lt = 1/L1 + 1/L2 + 1/L3

c)

Lt = L1 × L2 × L3

d)

Lt = L1 - L2 + L3

21.

What happens to inductance when inductors are connected in parallel?

a)

It increases

b)

It remains the same

c)

It decreases

d)

It becomes zero

22.

Which formula is used to calculate total inductance in parallel?

a)

Lt = L1 + L2 + L3

b)

1/Lt = 1/L1 + 1/L2 + 1/L3

c)

Lt = L1 × L2 × L3

d)

Lt = L1 - L2 + L3

23.

In a capacitive circuit, the current is said to be:

a)

Lagging

b)

Leading

c)

In phase

d)

Opposing

24.

In an inductive circuit, the current is said to be:

a)

Leading

b)

In phase

c)

Lagging

d)

Opposing

25.

What is the effect of increasing frequency on capacitive reactance (Xc)\left(X_c\right) ?

a)

It increases

b)

It decreases

c)

It remains constant

d)

It becomes zero

26.

What is the effect of increasing frequency on inductive reactance (XL)\left(X_L\right) ?

a)

It increases

b)

It decreases

c)

It remains constant

d)

It becomes zero

27.

Which of the following is true for inductors in series?

a)

Voltage is the same across all inductors

b)

Total inductance is less than the smallest inductor

c)

Total inductance is the sum of individual inductances

d)

Current is different across each inductor

28.

Which of the following is true for inductors in parallel?

a)

Voltage is different across each inductor

b)

Total inductance is the sum of individual inductances

c)

Total inductance is less than the smallest inductor

d)

Current is the same through each inductor

29.

What is the phase relationship in a purely resistive AC circuit?

a)

Voltage leads current

b)

Current leads voltage

c)

Voltage and current are in phase

d)

Voltage and current are out of phase

30.

Which of the following is a correct unit for charge?

a)

Volt

b)

Farad

c)

Coulomb

d)

Ampere

31.

What does a sinusoidal waveform represent in AC circuits?

a)

Constant voltage over time

b)

Random voltage changes

c)

Periodic variation of voltage or current

d)

Voltage spikes

32.

What is the periodic time of a waveform with a frequency of 50 Hz?

a)

0.02 s

b)

0.5 s

c)

2 s

d)

50 s

33.

What is the frequency of a waveform with a periodic time of 25 ms?

a)

25 Hz

b)

40 Hz

c)

50 Hz

d)

60 Hz

34.

What is the RMS value of a waveform with a peak value of 230V?

a)

115V

b)

230V

c)

162.6V

d)

325V

35.

Which of the following is true about capacitive reactance?

a)

It increases with increasing capacitance

b)

It decreases with increasing frequency

c)

It is independent of frequency

d)

It increases with increasing frequency

36.

Which of the following is true about inductive reactance?

a)

It decreases with increasing inductance

b)

It decreases with increasing frequency

c)

It increases with increasing frequency

d)

It is independent of inductance

37.

Which of the following formulas is used to calculate peak voltage from RMS voltage?

a)

Vp = 0.707 × Vrms

b)

Vp = 1.414 ×Vrms

c)

Vp = Vrms / 2

d)

Vp = Vrms × 2

38.

Which of the following is a correct formula for calculating charge in a capacitor?

a)

Q = V/C

b)

Q = C/V

c)

Q = C × V

d)

Q = V - C

39.

What is the effect of connecting capacitors in parallel?

a)

Total capacitance decreases

b)

Voltage across each capacitor changes

c)

Total capacitance increases

d)

Charge remains constant

40.

What is the effect of connecting capacitors in series?

a)

Total capacitance increases

b)

Voltage across each capacitor is equal

c)

Total capacitance decreases

d)

Charge varies across capacitors

41.

What does the term "cycle" refer to in an AC waveform?

a)

The voltage level

b)

One complete variation of the waveform

c)

The resistance in the circuit

d)

The time between two peaks

42.

Which of the following is true about RMS value?

a)

It is always higher than peak value

b)

It is equal to peak value

c)

It is lower than peak value

d)

It is twice the peak value

43.

What is the peak value of a waveform with a peak-to-peak value of 100V?

a)

50V

b)

70.7V

c)

100V

d)

200V

44.

Which of the following formulas is used to calculate peak value from peak-to-peak value?

a)

Vp = Vp-p

b)

Vp = Vp-p / 2

c)

Vp = 2 × Vp-p

d)

Vp = Vp-p × 0.707

45.

Which of the following describes a resistive load in an AC circuit?

a)

Current leads voltage

b)

Current lags voltage

c)

Current is in phase with voltage

d)

Voltage is zero

46.

Which of the following is true about voltage in capacitors connected in parallel?

a)

Voltage is different across each capacitor

b)

Voltage is the same across each capacitor

c)

Voltage is zero across each capacitor

d)

Voltage depends on capacitance

47.

What is the total capacitance if C1 = 100 mf and C2 = 50 mf in series?

a)

33.33 mF

b)

150 mF

c)

50 mF

d)

none of the choices

48.

What is the unit of inductance?

a)

Ohm

b)

Farad

c)

Henry

d)

Volt

49.

A waveform completes 10 cycles in 50 milliseconds. What is its frequency?

4 lines
50.

If the RMS voltage is 110 V, what is the peak and peak-to-peak voltage?

a)

Vpp = 311.56 V

b)

Vp = 155.56 V

c)

Vpp=110 V

d)

Vp=77.78 V

51.

A sinusoidal wave has a frequency of 100 Hz. What is the time for one cycle?

a)

0.01 sec

b)

1000 sec

c)

0.1 ses

d)

100 sec

52.

If the peak-to-peak voltage is 315 V, what is the peak and RMS voltage?

a)

Vp = 157.5 V
RMS = 111.37 V

b)

Vp = 630 V
RMS = 445.48 V

c)

Vp = 315 V
RMS = 445.48 V

d)

Vp = 157.50 V
RMS = 445.48 V

53.

 The time for one cycle of a waveform is 0.005 seconds. What is the frequency?

a)

200 Hz

b)

500 Hz

c)

50 Hz

d)

60 Hz

54.

Two capacitors of 4 µF and 6 µF are connected in series across a 12V supply. What is the total charge stored?

a)

48 µC

b)

28.8 µC

c)

72 µC

d)

19.2 µC

55.

Three capacitors of 2 µF, 3 µF, and 6 µF are connected in parallel across a 10V supply. What is the total charge stored?

a)

110 µC

b)

100 µC

c)

90 µC

d)

80 µC

56.

What is the capacitive reactance of a 10 µF capacitor at 50 Hz?

a)

318.4 Ω

b)

159.5 Ω

c)

636.6 Ω

d)

100 Ω

57.

What is the inductive reactance of a 100 mH inductor at 60 Hz?

a)

37.7 Ω

b)

6 Ω

c)

0.6 Ω

d)

600 Ω

58.

the positive or negative maximum value

a)

peak value

b)

peak-to-peak value

c)

RMS

d)

cyle

59.

the value between positive and negative maximum values.

a)

peak-to-peak value

b)

peak value

c)

RMS

d)

cycle

60.

the effective value of a varying voltage or current. It is the equivalent steady DC (constant) value which gives the same effect.

a)

RMS

b)

peak-value

c)

peak-to-peak value

d)

average value

61.

It is the equivalent steady DC (constant) value which gives the same effect.

a)

RMS

b)

peak-value

c)

peak-to-peak value

d)

average value

62.

Vpp is _____

a)

2x the Vp

b)

1/2 the Vp

c)

0.707 of Vp

d)

1.414

63.

one complete variation (or cycle) of the waveform

a)

cycle

b)

frequency

c)

periodic time

d)

Hertz

64.

the time taken to complete one cycle of the waveform.

a)

periodic time

b)

frequency

c)

cycle

d)

all of the choices

65.

the number of cycles completed in one second.

a)

frequency

b)

periodic time

c)

cycle

d)

root mean square

66.

Determine VpeakV_{peak}

a)

36V

b)

72V

c)

25.5V

d)

50.91V

67.

Determine VppV_{pp}

a)

36V

b)

72V

c)

25.5V

d)

50.91V

68.

Determine the frequency

a)

100 Hz

b)

10 Hz

c)

200 Hz

d)

36 Hz

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