Instrumentation Transducers

Filtering and Dynamic Compensation

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true for low-pass filter?
Pass band less than cut-off frequency
Pass band greater the cut-off frequency
Pass band anywhere in frequency response
None of the mentioned
Explanation:
A low-pass filter means, which passes all frequencies less than cut-off frequency. That is pass band will be less than cut-off frequency.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true for ideal filter frequency response?
Abrupt change from pass band to reject band
Smooth change from pass band to reject band
Contains only pass band
None of the mentioned
Explanation:
An ideal filter shows ideal performance and change from pass band to reject band occurs abruptly.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Notch filter belongs to _________________
Zero-order system
First-order system
Second-order system
Third-order system
Explanation:
Notch filter transfer function is a very complex one and contains higher order of three.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Why dynamic compensation is used?
To increase pass band
To increase cut off frequency
To improve dynamic performance
None of the mentioned
Explanation:
Dynamic compensation is used for improving dynamic performance of the system, it is achieved by proper selection of resistance and use of amplifiers to reduce the effect of losses.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statement is true?
Lead network is composed of capacitor only
Lag network is composed of inductor only
Lead network is composed of resistance only
Lead network and lag network is composed of resistance and capacitor
Explanation:
Lead network, lag network are composed of resistance and capacitive components using different configurations.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Identify the frequency response?
Low pass filter
High pass filter
Band pass filter
Band reject filter
Explanation:
Given frequency response passes a definite band of frequency and surely it is a band pass filter.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following represents bridge-T filter?
Band pass filter
Low pass filter
High pass filter
Band reject filter
Explanation:
Bridge-T filters reject a specific band of frequency and allow other frequencies to pass through. Hence it is a band reject filter.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Tuned LCR circuit forms band-pass filters.
True
False
Explanation:
Tuned LCR circuit in series and parallel combination allows a specific band of frequency to pass through and is band pass filter.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Rejection frequency of notch filter can be expressed as _________________
1/RC
1/C
1/R
Unpredictable
Explanation:
Rejection frequency is the range of frequency rejected by filter, it is on applicable if R1=R2 and C1=C2.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Twin-T filter is band reject and Notch filter is band pass filter.
True
False
Explanation:
Twin-T filter itself is called as Notch filter, they are band reject filters.