Filters Objective Electrical MCQ Questions Online

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Filters in electric circuits are an essential element of circuit design that allows for removing unwanted frequencies from the circuit. Filters improve the circuit’s performance by blocking or passing specific frequencies and find their applications in audio, radio, and power supply circuits and in many other electronic devices. Filters are divided into two main types: passive and active filters.

Passive filters are simple circuits that use only passive components like resistors, capacitors, and inductors. They are easy to design and cost-effective. On the other hand, active filters require additional components, such as transistors or operational amplifiers, to achieve filtering. They are complex to design but offer better performance than passive filters. Several types of filters can be used in electric circuits. These include low-pass filters, high-pass filters, band-pass filters, and band-stop filters. A low-pass filter passes low-frequency signals while blocking high-frequency signals. A high-pass filter, on the other hand, passes high-frequency signals while blocking low-frequency signals. A band-pass filter allows signals within a certain frequency range to pass while blocking signals outside that range. A band-stop or notch filter blocks signals within a certain frequency range while allowing signals outside that range to pass. Filters can be designed to have different characteristics based on the application. For example, a filter can be designed to have a steep roll-off characteristic, which means that it can quickly attenuate signals outside the passband. Alternatively, a filter can be designed to have a gentle roll-off characteristic, which means that it attenuates signals outside the passband more gradually.

In this post Electrical Engineering Online shares Objective Electrical MCQ Questions on Earthing and Grounding.

What is the primary function of an electrical filter?

What is the primary function of an electrical filter?

  1. To amplify signals
  2. To generate electrical power
  3. To remove or attenuate specific frequencies
  4. To convert AC to DC

Correct Answer: 3. To remove or attenuate specific frequencies

Explanation: The primary function of an electrical filter is to remove or attenuate particular frequencies from a signal while allowing others to pass through.

Which type of filter allows frequencies below a particular cutoff frequency to pass through and attenuates frequencies above it

Which type of filter allows frequencies below a particular cutoff frequency to pass through and attenuates frequencies above it?

  1. Low-pass filter
  2. High-pass filter
  3. Band-pass filter
  4. Band-stop filter

Correct Answer: 1. Low-pass filter

Explanation: A low-pass filter allows frequencies below a particular cutoff frequency to pass through while attenuating frequencies above.

Which type of filter allows frequencies above a specific cutoff frequency to pass through and attenuates frequencies below it

Which type of filter allows frequencies above a specific cutoff frequency to pass through and attenuates frequencies below it?

  1. Low-pass filter
  2. High-pass filter
  3. Band-pass filter
  4. Band-stop filter

Correct Answer: 2. High-pass filter

Explanation: A high-pass filter allows frequencies above a particular cutoff frequency to pass through while attenuating frequencies below.

Which type of filter allows frequencies within a specific range (bandwidth) to pass through and attenuate frequencies outside that range

Which type of filter allows frequencies within a specific range (bandwidth) to pass through and attenuate frequencies outside that range?

  1. Low-pass filter
  2. High-pass filter
  3. Band-pass filter
  4. Band-stop filter

Correct Answer: 3. Band-pass filter

Explanation: A band-pass filter allows frequencies within a specific range (bandwidth) to pass through while attenuating frequencies outside that range.

Which type of filter attenuates frequencies within a specific range and allows frequencies outside that range to pass through

Which type of filter attenuates frequencies within a specific range and allows frequencies outside that range to pass through?

  1. Low-pass filter
  2. High-pass filter
  3. Band-pass filter
  4. Band-stop filter

Correct Answer: 4. Band-stop filter

Explanation: A band-stop filter attenuates frequencies within a specific range (stopban4. and allows frequencies outside that range to pass through.

What is the order of a filter?

What is the order of a filter?

  1. The number of elements in the filter circuit
  2. The slope of the filter’s frequency response
  3. The total resistance in the filter circuit
  4. The total capacitance in the filter circuit

Correct Answer: 2. The slope of the filter’s frequency response

Explanation: The order of a filter refers to the slope of its frequency response curve and indicates the rate at which the filter attenuates frequencies beyond its cutoff point.

Which of the following filter types has the steepest roll-off rate

Which of the following filter types has the steepest roll-off rate?

  1. First-order filter
  2. Second-order filter
  3. Third-order filter
  4. Fourth-order filter

Correct Answer: 4. Fourth-order filter

Explanation: A fourth-order filter has a steeper roll-off rate than lower-order filters, resulting in a faster attenuation of frequencies beyond its cutoff point.

Which filter characteristic describes the range of frequencies over which the filter provides a specified attenuation level

Which filter characteristic describes the range of frequencies over which the filter provides a specified attenuation level?

  1. Bandwidth
  2. Cutoff frequency
  3. Rolloff rate
  4. Stopband attenuation

Correct Answer: 1. Bandwidth

Explanation: Bandwidth is the range of frequencies over which a filter provides a specified attenuation level.

What is the cutoff frequency of a filter

What is the cutoff frequency of a filter?

  1. The highest frequency allowed to pass through the filter
  2. The lowest frequency allowed to pass through the filter
  3. The frequency at which the filter’s response is attenuated by 3 dB (half power) compared to its passband response
  4. None of above

Correct Answer: 3. The frequency at which the filter’s response is attenuated by 3 dB (half power) compared to its passband response

Explanation: The cutoff frequency of a filter is the frequency at which the filter’s response is attenuated by 3 dB (half power) compared to its passband response. It is the frequency that separates the frequencies that pass through with minimal attenuation (the passban4. from those that are attenuated (the stopband).

What is the roll-off rate of a filter

What is the roll-off rate of a filter?

  1. The rate at which the filter’s gain changes with frequency
  2. The rate at which the filter’s phase changes with frequency
  3. The rate at which the filter’s output voltage changes with the input voltage
  4. The rate at which the filter attenuates frequencies beyond its cutoff point

Correct Answer: 4. The rate at which the filter attenuates frequencies beyond its cutoff point

Explanation: The roll-off rate of a filter describes the rate at which the filter attenuates frequencies beyond its cutoff point. It determines how quickly the filter suppresses frequencies outside its passband.

What is the purpose of a Butterworth filter

What is the purpose of a Butterworth filter?

  1. To provide a constant gain within its passband
  2. To provide a flat frequency response within its passband
  3. To provide a high roll-off rate
  4. To provide a narrow bandwidth

Correct Answer: 2. To provide a flat frequency response within its passband

Explanation: A Butterworth filter is designed to provide a flat frequency response within its passband, meaning it has a constant gain across the desired frequencies.

What is the characteristic of a Chebyshev filter

What is the characteristic of a Chebyshev filter?

  1. Maximally flat frequency response
  2. Constant group delay
  3. Steep roll-off rate
  4. Equal ripple in the passband or stopband

Correct Answer: 4. Equal ripple in the passband or stopband

Explanation: A Chebyshev filter is characterized by having an equal ripple in either the passband or the stopband. This allows for a sharper roll-off rate compared to a Butterworth filter.

What is the primary advantage of an active filter over a passive filter

What is the primary advantage of an active filter over a passive filter?

  1. Lower cost
  2. Simplicity of design
  3. Greater flexibility and adjustability
  4. Higher power handling capability

Correct Answer: 3. Greater flexibility and adjustability

Explanation: An active filter, which incorporates active components such as operational amplifiers, offers greater flexibility and adjustability regarding cutoff frequencies, gain, and Q-factor compared to passive filters.

What is the purpose of a Sallen-Key filter

What is the purpose of a Sallen-Key filter?

  1. To provide high-pass filtering
  2. To provide band-pass filtering
  3. To provide low-pass filtering
  4. To provide notch filtering

Correct Answer: 2. To provide band-pass filtering

Explanation: A Sallen-Key filter is commonly used to implement band-pass filtering, allowing only frequencies within a specific range to pass through.

What is the function of a de-emphasis filter in audio applications

What is the function of a de-emphasis filter in audio applications?

  1. To boost low-frequency signals
  2. To boost high-frequency signals
  3. To attenuate low-frequency signals
  4. To attenuate high-frequency signals

Correct Answer: 2. To boost high-frequency signals

Explanation: A de-emphasis filter is used in audio applications to boost high-frequency signals, compensating for the pre-emphasis applied during the recording process to improve the signal-to-noise ratio.

What is the main disadvantage of an elliptic filter

What is the main disadvantage of an elliptic filter

  1. Limited bandwidth
  2. High cost
  3. Complex design
  4. Nonlinear phase response

Correct Answer: 3. Complex design

Explanation: Elliptic filters have a complex design compared to other filter types, making their implementation more challenging. They require careful consideration of filter order, ripple levels, and cutoff frequencies.

What is the purpose of a notch filter

What is the purpose of a notch filter?

  1. To attenuate a specific narrow band of frequencies
  2. To pass a specific narrow band of frequencies
  3. To attenuate high-frequency signals
  4. To attenuate low-frequency signals

Correct Answer: 1. To attenuate a specific narrow band of frequencies

Explanation: A notch filter is designed to attenuate a specific narrow band of frequencies, typically used to remove unwanted interference or specific harmonics from a signal.

Which type of filter has a constant resistance value for all frequencies

Which type of filter has a constant resistance value for all frequencies

  1. Passive filter
  2. Active filter
  3. RC filter
  4. LC filter

Correct Answer: 1. Passive filter

Explanation: In a passive filter, the resistors have constant frequency resistance values. Passive filters consist of passive components such as resistors, capacitors, and inductors.

What is the purpose of cascading multiple filter stages

What is the purpose of cascading multiple filter stages

  1. To increase the overall filter gain
  2. To increase the filter’s bandwidth
  3. To improve the filter’s roll-off rate
  4. To achieve a steeper phase response

Correct Answer: 3. To improve the filter’s roll-off rate

Explanation: Cascading multiple filter stages increases the overall roll-off rate of the filter, resulting in a sharper attenuation of frequencies beyond the cutoff point.

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