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Analog Lab: Pre-Quiz and Viva Questions (MCQ Format)

Total questions: 103

Worksheet time: 52mins

Name
Class
Date
1.

What is the phase angle (θ) in a pure RC circuit?

a)

0°

b)

45°

c)

90°

d)

180°

2.

In an RC circuit, the current leads the applied voltage by:

a)

0°

b)

45°

c)

90°

d)

180°

3.

The capacitive reactance (Xc) of a capacitor is given by:

a)

Xc = 1/2πfC

b)

Xc = 2πfC

c)

Xc = 2πfL

d)

Xc = 1/2πfL

4.

In an RC circuit, if the frequency increases, the capacitive reactance:

a)

Increases

b)

Decreases

c)

Remains the same

d)

Becomes zero

5.

The unit of capacitive reactance is:

a)

Ohm

b)

Farad

c)

Henry

d)

Volt

6.

If R = 10 kΩ and C = 0.1 μF, what is the time constant (RC) of the circuit?

a)

0.1 ms

b)

1 ms

c)

10 ms

d)

100 ms

7.

In an RC circuit, the phase angle (θ) is 0° when:

a)

R = 0

b)

C = 0

c)

R = ∞

d)

C = ∞

8.

The current in an RC circuit is maximum when the phase angle is:

a)

0°

b)

45°

c)

90°

d)

180°

9.

The phase angle in an RC circuit depends on:

a)

Only R

b)

Only C

c)

Both R and C

d)

Neither R nor C

10.

In an RC circuit, if the resistance is increased, the phase angle:

a)

Increases

b)

Decreases

c)

Remains the same

d)

Becomes zero

11.

The time constant (RC) of a circuit is defined as the time required for the voltage across the capacitor to reach:

a)

0% of its final value

b)

37% of its final value

c)

63% of its final value

d)

100% of its final value

12.

The impedance (Z) of an RC circuit is found as:

a)

Z = R + Xc

b)

Z = √(R² + Xc²)

c)

Z = R - Xc

d)

Z = R/Xc

13.

The phase angle (θ) in an RC circuit is given by:

a)

tan θ = Xc/R

b)

tan θ = R/Xc

c)

tan θ = Xc × R

d)

tan θ = R × Xc

14.

In an RC circuit, the current waveform leads the voltage waveform by:

a)

0°

b)

45°

c)

90°

d)

180°

15.

The value of capacitive reactance (Xc) is:

a)

Directly proportional to frequency

b)

Inversely proportional to frequency

c)

Directly proportional to capacitance

d)

Inversely proportional to capacitance

16.

The phase angle in an RC circuit is maximum when:

a)

R = 0

b)

C = 0

c)

R = ∞

d)

C = ∞

17.

The current in an RC circuit is minimum when the phase angle is:

a)

0°

b)

45°

c)

90°

d)

180°

18.

The time constant of an RC circuit is:

a)

RC

b)

1/RC

c)

R + C

d)

R/C

19.

The phase angle in an RC circuit is zero when:

a)

R = 0

b)

C = 0

c)

R = ∞

d)

C = ∞

20.

The current in an RC circuit is maximum when the phase angle is:

a)

0°

b)

45°

c)

90°

d)

180°

21.

What is the function of a diode in a clipper circuit?

a)

To amplify the signal

b)

To clip off a portion of the signal

c)

To filter the signal

d)

To invert the signal

22.

A series clipper circuit consists of:

a)

Only a diode

b)

A diode and a resistor in series

c)

A diode and a resistor in parallel

d)

Only a resistor

23.

Ohm’s Law states that:

a)

Current is directly proportional to voltage and inversely proportional to resistance

b)

Current is directly proportional to resistance and inversely proportional to voltage

c)

Voltage is directly proportional to resistance and inversely proportional to current

d)

None of the above

24.

The SI unit of resistance is:

a)

Ohm

b)

Ampere

c)

Volt

d)

Watt

25.

The device used to measure electric current is called:

a)

Voltmeter

b)

Ammeter

c)

Rheostat

d)

Galvanometer

26.

The device used to vary the resistance in an electric circuit is called:

a)

Voltmeter

b)

Ammeter

c)

Rheostat

d)

Galvanometer

27.

The slope of the V-I graph for a conductor gives:

a)

Resistance

b)

Current

c)

Voltage

d)

Power

28.

The resistance of a conductor depends on:

a)

Length

b)

Area of cross-section

c)

Nature of material

d)

All of the above

29.

The reciprocal of resistance is called:

a)

Conductance

b)

Capacitance

c)

Inductance

d)

Reactance

30.

The SI unit of conductance is:

a)

Ohm

b)

Siemens

c)

Farad

d)

Henry

31.

The resistance of a wire is 10 ohms. If its length is doubled and area is halved, its new resistance will be:

a)

10 ohms

b)

20 ohms

c)

40 ohms

d)

80 ohms

32.

The instrument used to measure potential difference is:

a)

Voltmeter

b)

Ammeter

c)

Rheostat

d)

Galvanometer

33.

The resistance of a conductor increases with:

a)

Increase in length

b)

Increase in area

c)

Decrease in length

d)

Decrease in area

34.

The resistance of a conductor decreases with:

a)

Increase in length

b)

Increase in area

c)

Decrease in area

d)

Increase in temperature

35.

The resistance of a wire is 5 ohms. If the length is doubled and area is doubled, the new resistance will be:

a)

2.5 ohms

b)

5 ohms

c)

10 ohms

d)

20 ohms

36.

The resistance of a wire is 8 ohms. If the length is halved and area is doubled, the new resistance will be:

a)

2 ohms

b)

4 ohms

c)

8 ohms

d)

16 ohms

37.

The resistance of a wire is 12 ohms. If the length is tripled and area is tripled, the new resistance will be:

a)

4 ohms

b)

12 ohms

c)

36 ohms

d)

108 ohms

38.

The resistance of a wire is 6 ohms. If the length is halved and area is halved, the new resistance will be:

a)

3 ohms

b)

6 ohms

c)

12 ohms

d)

24 ohms

39.

The resistance of a wire is 20 ohms. If the length is doubled and area is doubled, the new resistance will be:

a)

5 ohms

b)

10 ohms

c)

20 ohms

d)

40 ohms

40.

The resistance of a wire is 15 ohms. If the length is tripled and area is doubled, the new resistance will be:

a)

10 ohms

b)

15 ohms

c)

22.5 ohms

d)

45 ohms

41.

The resistance of a wire is 18 ohms. If the length is doubled and area is tripled, the new resistance will be:

a)

6 ohms

b)

9 ohms

c)

12 ohms

d)

36 ohms

42.

The resistance of a wire is 24 ohms. If the length is halved and area is tripled, the new resistance will be:

a)

4 ohms

b)

8 ohms

c)

12 ohms

d)

24 ohms

43.

The change of output response to a step input occurs:

a)

instantaneously

b)

gradually

c)

after a long time

d)

never

44.

The operation which is NOT a function of a rectifier is:

a)

to convert ac to dc

b)

to remove ac component from output

c)

to provide a constant dc output

d)

to provide a variable dc output

45.

A filter is used in a rectifier circuit to:

a)

increase the output voltage

b)

decrease the output voltage

c)

remove the ac component from the output

d)

increase the ac component in the output

46.

A capacitor filter is preferred for:

a)

low current circuits

b)

high current circuits

c)

both (a) and (b)

d)

none of the above

47.

The ripple factor of a full wave rectifier with a capacitor filter is:

a)

less than that of a half wave rectifier

b)

more than that of a half wave rectifier

c)

equal to that of a half wave rectifier

d)

none of the above

48.

A choke input filter is preferred for:

a)

low current circuits

b)

high current circuits

c)

both (a) and (b)

d)

none of the above

49.

A π filter consists of:

a)

two capacitors and one inductor

b)

two inductors and one capacitor

c)

three capacitors

d)

three inductors

50.

The main function of a filter is to:

a)

increase the output voltage

b)

decrease the output voltage

c)

remove the ac component from the output

d)

increase the ac component in the output

51.

A filter circuit is generally used after:

a)

rectifier

b)

transformer

c)

load

d)

none of the above

52.

The ripple factor of a full wave rectifier with a capacitor filter is:

a)

0.482

b)

1.21

c)

0.707

d)

0.5

53.

A filter circuit is used to:

a)

remove the ac component from the output

b)

increase the ac component in the output

c)

increase the output voltage

d)

decrease the output voltage

54.

A π filter is also known as:

a)

capacitor input filter

b)

choke input filter

c)

both (a) and (b)

d)

none of the above

55.

The value of ripple factor for a full wave rectifier with a capacitor filter is:

a)

0.482

b)

1.21

c)

0.707

d)

0.5

56.

A filter circuit is used after:

a)

rectifier

b)

transformer

c)

load

d)

none of the above

57.

A π filter consists of:

a)

two capacitors and one inductor

b)

two inductors and one capacitor

c)

three capacitors

d)

three inductors

58.

A filter is used in a rectifier circuit to:

a)

increase the output voltage

b)

decrease the output voltage

c)

remove the ac component from the output

d)

increase the ac component in the output

59.

A capacitor filter is preferred for:

a)

low current circuits

b)

high current circuits

c)

both (a) and (b)

d)

none of the above

60.

A choke input filter is preferred for:

a)

low current circuits

b)

high current circuits

c)

both (a) and (b)

d)

none of the above

61.

A π filter is also known as:

a)

capacitor input filter

b)

choke input filter

c)

both (a) and (b)

d)

none of the above

62.

The value of ripple factor for a full wave rectifier with a capacitor filter is:

a)

0.482

b)

1.21

c)

0.707

d)

0.5

63.

The cut-off frequency of an RC low pass filter is

a)

1/2πRC

b)

2πRC

c)

1/RC

d)

RC

64.

In an RC low pass filter, the output voltage decreases as the frequency of the input signal

a)

increases

b)

decreases

c)

remains same

d)

none of these

65.

The phase shift at the cut-off frequency of an RC low pass filter is

a)

0°

b)

45°

c)

90°

d)

180°

66.

The output voltage of an RC low pass filter at very high frequency approaches

a)

zero

b)

infinity

c)

maximum

d)

none of these

67.

The output voltage of an RC low pass filter at very low frequency approaches

a)

zero

b)

infinity

c)

maximum

d)

none of these

68.

The bandwidth of an RC low pass filter is equal to

a)

cut-off frequency

b)

twice the cut-off frequency

c)

half the cut-off frequency

d)

none of these

69.

The output voltage of an RC low pass filter at the cut-off frequency is

a)

0.707 times the input

b)

0.5 times the input

c)

equal to the input

d)

zero

70.

The phase shift of an RC low pass filter at zero frequency is

a)

0°

b)

45°

c)

90°

d)

180°

71.

The output voltage of an RC low pass filter at the cut-off frequency is

a)

70.7% of input

b)

50% of input

c)

100% of input

d)

zero

72.

The phase shift of an RC low pass filter at very high frequency is

a)

0°

b)

45°

c)

90°

d)

180°

73.

The cut-off frequency of an RC high pass filter is

a)

1/2πRC

b)

2πRC

c)

1/RC

d)

RC

74.

In an RC high pass filter, the output voltage increases as the frequency of the input signal

a)

increases

b)

decreases

c)

remains same

d)

none of these

75.

The phase shift at the cut-off frequency of an RC high pass filter is

a)

0°

b)

45°

c)

90°

d)

180°

76.

The output voltage of an RC high pass filter at very low frequency approaches

a)

zero

b)

infinity

c)

maximum

d)

none of these

77.

The output voltage of an RC high pass filter at very high frequency approaches

a)

zero

b)

infinity

c)

maximum

d)

none of these

78.

The bandwidth of an RC high pass filter is equal to

a)

cut-off frequency

b)

twice the cut-off frequency

c)

half the cut-off frequency

d)

none of these

79.

The output voltage of an RC high pass filter at the cut-off frequency is

a)

0.707 times the input

b)

0.5 times the input

c)

equal to the input

d)

zero

80.

The phase shift of an RC high pass filter at zero frequency is

a)

0°

b)

45°

c)

90°

d)

180°

81.

The output voltage of an RC high pass filter at the cut-off frequency is

a)

70.7% of input

b)

50% of input

c)

100% of input

d)

zero

82.

The phase shift of an RC high pass filter at very high frequency is

a)

0°

b)

45°

c)

90°

d)

180°

83.

What is dB?

a)

Output of a circuit

b)

Ratio of two similar quantities

c)

Ratio of two different quantities

d)

None of the above

84.

dB is used to express:

a)

Gain

b)

Loss

c)

Both gain and loss

d)

None of the above

85.

3. dB is a ________ unit.

a)

Linear

b)

Non-linear

c)

Logarithmic

d)

None of the above

86.

The frequency response of an amplifier shows:

a)

Output voltage vs. frequency

b)

Input voltage vs. frequency

c)

Output current vs. frequency

d)

None of the above

87.

The bandwidth of an amplifier is defined as the range of frequencies between:

a)

Lower and upper cut-off frequencies

b)

Zero and maximum frequency

c)

Minimum and maximum gain

d)

None of the above

88.

The lower cut-off frequency is the frequency at which the gain falls to ________ of its mid-band value.

a)

0.707

b)

0.5

c)

1.414

d)

2

89.

The upper cut-off frequency is the frequency at which the gain falls to ________ of its mid-band value.

a)

0.707

b)

0.5

c)

1.414

d)

2

90.

The mid-band gain of an amplifier is usually expressed in:

a)

Volts

b)

Amperes

c)

dB

d)

Ohms

91.

The gain of an amplifier decreases at:

a)

Low frequencies only

b)

High frequencies only

c)

Both low and high frequencies

d)

Mid frequencies

92.

The main reason for the decrease in gain at low frequencies is:

a)

Coupling capacitor

b)

Bypass capacitor

c)

Both a and b

d)

None of the above

93.

The main reason for the decrease in gain at high frequencies is:

a)

Coupling capacitor

b)

Bypass capacitor

c)

Internal capacitance of transistor

d)

None of the above

94.

The frequency response curve of an RC coupled amplifier is:

a)

Flat

b)

Sloping

c)

Bell-shaped

d)

None of the above

95.

The bandwidth of an amplifier is the difference between ________ and ________ cut-off frequencies.

a)

upper, lower

b)

lower, upper

c)

high, low

d)

input, output

96.

The gain of an amplifier is maximum at ________ frequencies.

a)

mid

b)

low

c)

high

d)

zero

97.

The gain of an amplifier is minimum at ________ and ________ frequencies.

a)

low, high

b)

high, low

c)

mid, high

d)

mid, low

98.

The value of lower cut-off frequency is generally in the range of ________ Hz.

a)

10-100

b)

100-1000

c)

1000-10000

d)

0.1-1

99.

The value of upper cut-off frequency is generally in the range of ________ kHz.

a)

10-100

b)

0.1-1

c)

1000-2000

d)

0.01-0.1

100.

The mid-band gain of an amplifier is also called ________ gain.

a)

maximum

b)

minimum

c)

average

d)

input

101.

The time constant (τ) of an RC circuit is defined as:

a)

R + C

b)

1/(R × C)

c)

R × C

d)

R - C

102.

In an RC circuit, the voltage across the capacitor increases:

a)

never

b)

exponentially

c)

instantaneously

d)

linearly

103.

The total impedance (Z) in an RC circuit can be expressed as:

a)

Z = R + jXc

b)

Z = R/Xc

c)

Z = R - jXc

d)

Z = R × Xc

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