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Passive Filters

Study 20 Electrical Engineering MCQs with correct answers and explanations.

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1Electrical EngineeringMedium

In a series resonant band-pass filter, a lower value of Q results in________?

Aa smaller bandwidth

Ba higher resonant frequency

Ca higher impedance

Da larger bandwidth

Correct answer

D. a larger bandwidth

Explanation

The correct answer is a larger bandwidth.

2Electrical EngineeringMedium

A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

A514 kHz

B5.03 MHz

C503 kHz

D5.14 MHz

Correct answer

D. 5.14 MHz

Explanation

The correct answer is 5.14 MHz.

3Electrical EngineeringMedium

An RL low-pass filter consists of a 5.6 mH coil and a 3.3 kΩ resistor. The output voltage is taken across the resistor. The circuit’s critical frequency is________?

A93.8 kHz

B86.12 kHz

C93.8 Hz

D861 Hz

Correct answer

A. 93.8 kHz

Explanation

The correct answer is 93.8 kHz.

4Electrical EngineeringMedium

An RC high-pass filter consists of a 0.2 µF capacitor and a 220 Ω resistor. The output is taken across the resistor. The circuit’s critical frequency is________?

A723 Hz

B7,234 Hz

C3,617 Hz

D362 Hz

Correct answer

C. 3,617 Hz

Explanation

The correct answer is 3,617 Hz.

5Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is________?

A0 Hz

B3.5 kHz

C7 kHz

D0 Hz to 3.5 kHz

Correct answer

D. 0 Hz to 3.5 kHz

Explanation

The correct answer is 0 Hz to 3.5 kHz.

6Electrical EngineeringMedium

In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency________?

Acannot be determined

Bis 10 kHz

Cis 7 kHz

Dis 12 kHz

Correct answer

D. is 12 kHz

Explanation

The correct answer is is 12 kHz.

7Electrical EngineeringMedium

A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?

A999 Hz

B2,176 Hz

C4,591 Hz

D459 Hz

Correct answer

C. 4,591 Hz

Explanation

The correct answer is 4,591 Hz.

8Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. Its passband is________?

A7 kHz

B0 Hz

C3.5 kHz

D0 Hz to 3.5 kHz

Correct answer

D. 0 Hz to 3.5 kHz

Explanation

The correct answer is 0 Hz to 3.5 kHz.

9Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

A6 V

B5.97 V

C0 V

D597 mV

Correct answer

B. 5.97 V

Explanation

The correct answer is 5.97 V.

10Electrical EngineeringMedium

A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is________?

A18 V peak-to-peak

B9 V peak-to-peak

Czero

D12.74 V peak-to-peak

Correct answer

C. zero

Explanation

The correct answer is zero.

1Electrical EngineeringMedium

In a series resonant band-pass filter, a lower value of Q results in________?

Aa smaller bandwidth

Ba higher resonant frequency

Ca higher impedance

Da larger bandwidth

Correct answer

D. a larger bandwidth

Explanation

The correct answer is a larger bandwidth.

2Electrical EngineeringMedium

A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

A514 kHz

B5.03 MHz

C503 kHz

D5.14 MHz

Correct answer

D. 5.14 MHz

Explanation

The correct answer is 5.14 MHz.

3Electrical EngineeringMedium

An RL low-pass filter consists of a 5.6 mH coil and a 3.3 kΩ resistor. The output voltage is taken across the resistor. The circuit’s critical frequency is________?

A93.8 kHz

B86.12 kHz

C93.8 Hz

D861 Hz

Correct answer

A. 93.8 kHz

Explanation

The correct answer is 93.8 kHz.

4Electrical EngineeringMedium

An RC high-pass filter consists of a 0.2 µF capacitor and a 220 Ω resistor. The output is taken across the resistor. The circuit’s critical frequency is________?

A723 Hz

B7,234 Hz

C3,617 Hz

D362 Hz

Correct answer

C. 3,617 Hz

Explanation

The correct answer is 3,617 Hz.

5Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is________?

A0 Hz

B3.5 kHz

C7 kHz

D0 Hz to 3.5 kHz

Correct answer

D. 0 Hz to 3.5 kHz

Explanation

The correct answer is 0 Hz to 3.5 kHz.

6Electrical EngineeringMedium

In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency________?

Acannot be determined

Bis 10 kHz

Cis 7 kHz

Dis 12 kHz

Correct answer

D. is 12 kHz

Explanation

The correct answer is is 12 kHz.

7Electrical EngineeringMedium

A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?

A999 Hz

B2,176 Hz

C4,591 Hz

D459 Hz

Correct answer

C. 4,591 Hz

Explanation

The correct answer is 4,591 Hz.

8Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. Its passband is________?

A7 kHz

B0 Hz

C3.5 kHz

D0 Hz to 3.5 kHz

Correct answer

D. 0 Hz to 3.5 kHz

Explanation

The correct answer is 0 Hz to 3.5 kHz.

9Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

A6 V

B5.97 V

C0 V

D597 mV

Correct answer

B. 5.97 V

Explanation

The correct answer is 5.97 V.

10Electrical EngineeringMedium

A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is________?

A18 V peak-to-peak

B9 V peak-to-peak

Czero

D12.74 V peak-to-peak

Correct answer

C. zero

Explanation

The correct answer is zero.