Testbook Logo
Exams SuperCoaching Test Series Skill Academy
More
English
Hindi

Question

Download Solution PDF

What is the roll-off rate of voltage gain vs frequency of a second order low pass filter?

This question was previously asked in
VSSC ISRO Technical Assistant Electronics 14 July 2021 Official Paper
Download PDF Attempt Online
View all ISRO Technical Assistant Papers >
  1. -6dB/octave
  2. -12dB/octave
  3. -6dB/decade
  4. -12dB/decade

Answer (Detailed Solution Below)

Option 2 : -12dB/octave
Free Tests
View all Free tests >
Free
ISRO Technical Assistant Mechanical Full Mock Test
2.7 K Users
80 Questions 80 Marks 90 Mins
Start Now

Detailed Solution

Download Solution PDF

The frequency response of the second-order low pass filter is identical to that of the first-order type except that the stop band roll-off will be twice the first-order filters at 40 dB/decade (12 dB/octave). 

The response of the second order filter is:

60fe8e000c2dcd8753148495 16425017016761

Download Solution PDF
Latest ISRO Technical Assistant Updates

Last updated on May 30, 2025

-> The ISRO Technical Assistant recruitment 2025 notification has been released at the official website. 

-> Candidates can apply for ISRO recruitment 2025 for Technical Assistant from June 4 to 18.

-> A total of 83 vacancies have been announced for the post of Technical Assistant.

-> The Selection process consists of a written test and a Skill test.

-> Candidates can also practice through ISRO Technical Assistant Electrical Test Series, ISRO Technical Assistant Electronics Test Series, and ISRO Technical Assistant Mechanical Test Series to improve their preparation and increase the chance of selection. 

More Digital Filters Questions

Q1.In the design of Digital IIR Filters by means of Bilinear Transform, the design specifications are given. Match the following lists: List - I List - II P. N and Δf fixed 1. The design procedure has to start with the evaluation of the order of the filter necessary to meet the specifications in terms of the desired attenuation, transition bandwidth and  pass-band deviation. Q. Δf and δ fixed 2. The filter is completely specified and the transition bandwidth is directly obtainable during the design procedure. R. N and δ fixed 3. The design is completely deter- mined for the Butterworth filter case by obtaining the value of the attenuation at fa directly. Select the correct answer using the code given below: 
Q2.Consider the following circuits and arrange them in ascending order of their complexity. A. First order low pass filter B. Sallen‐Key filter C. Fourth order Butterworth low pass filter D. Non‐inverting amplifier Choose the correct answer from the options given below
Q3.Match List I with List II List – I List – II Filter Frequency Response A. Low Pass Filter I. B. High Pass Filter II. C. Band Pass Filter III. D. Band Reject Filter IV. Choose the correct answer from the options given below: 
Q4.Which of the following statements are correct? A. If the intermediate frequency is too high, poor selectivity results even if sharp cutoff filters are used in the IF stage. B. A high value of intermediate frequency increases tracking difficulties. C. As the intermediate frequency is lowered, image frequency rejection becomes better. D. A very low intermediate frequency can make the selectivity too sharp. Choose the correct answer from the options given below:
Q5.Consider a continuous time system which is represented using a differential equation \(\frac{dy(t)}{dt}\) + 0.1y(t) = x(t). The digital filter is obtained using the first forward difference method with the derivative part replaced with (y[n + 1] − y[n])/T. The values of T, for which the digital filter is stable, are:
Q6.Consider an FIR filter whose Impulse response is h[n] = \(\sum_{k=0}^{6} \)(4 − |k − 3|) δ[n − k]. The phase function of h[n] is:
Q7.Consider a system equation y(n + 2) = -3x(n + 2) + 2x(n) - 5x(n - 1), the system is ______and _______ respectively.
Q8.Consider a 51 taplinear phase FIR filter operating at a sampling frequency of 10 kHz. The delay of this linear phase FIR is:
Q9.Which of the following is the transfer function for the all-pass filter?
Suggested Test Series
View All >
ISRO Technical Assistant 2024 Mock Test
97 Total Tests with 2 Free Tests
Start Free Test
AE & JE Mechanical Engg. Exams Previous Year Papers Mock Test
178 Total Tests with   4 Free Tests
Start Free Test

More Signals and Systems Questions

Q1.The Fourier Transform of an real and even function results in:
Q2.Sinc pulse shaping is derived from the Fourier Transform of a _______ function.
Q3.What type of distortion occurs if a signal that contains frequency components up to 15 kHz is sampled using 20 kHz?
Q4.Which one of the following systems described by the following input-output relations is time invariant ? 
Q5.The equation for voltage waveform v(t) shown below is (where u(t) is unit step input) :
Q6.A continuous-time signal x(t) is defined as : \(x(\mathrm{t})=\left\{\begin{array}{cc} 5 & -2 \leq \mathrm{t} \leq 2 \\ 0 & \text { otherwise } \end{array}\right.\) The energy of signal x(t) is : 
Q7.If Z(un) = f(z), then Z(a − nun) (where Z denotes z-transform) equals to :
Q8.The Laplace transform of x(t) is \(\sqrt{\frac{2}{s-3}}\).  Then Laplace transform of e−6tx(t) is :
Q9.Which one of the following is the correct relation ? (a > 0) 
Q10.What is the formula of finding the final value of any time varying function f(t)?
Important Exam
Super Coaching
Exams
Test Series
Previous Year Papers
Objective Questions
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
[email protected]
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Our Apps
Follow us on
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Get Free Access Now
Hot Links： teen patti game teen patti comfun card online teen patti bodhi teen patti star login