# Signal and control mcqs

Discussion in 'Homework Help' started by Abu Bakar, Jun 26, 2015.

1. ### Abu Bakar Thread Starter New Member

Jun 26, 2015
2
0
Hello friends,
i am a student of Electrical Power engineering and i have to appear for a test in which i can face questions related to signals and system, control and dsp. That is why i need answer to some of questions below, any help will be much appreciated. Thanks

1) Period of infinite continuous fourier series == ?
a. N
b. N+M
c. infinite
d. 2*pi/n

2) ROC converges if poles and zeros lie inside == ?
a. Origion
b. Z=1

3) Which modulation has higher data rates == ?
a. fm
b. am
c. qam
d. qpsk

4) In LTI system is characterized by == ?
a. Impulse input
b. Step input

5) Transfer function is == ?
a. Mathematical model
b. System with no physical structure
c. Can be calculated through differential equations

6) If ROC (Region of convergence) does not include unit circle then == ?
a. Fourier transform converges
b. Z-transform converges
c. Harley transform converges

7) Fastest achievable Response without overshooting == ?
a. under damped
b. overdamped
c. critically damped

8) If z transform lies in ROC then == ?
A. System is stable
B. Inverse of system is stable
C. Both system and its inverse are unstable
D. Both system and its inverse are stable

9) Under damped response have
a. damping ratio>1
b. 0>damping ratio<1
c. damping ratio =1
d. damping ratio =0

10) We built control systems for _______ == ?
a. remote control,
b. stability,
c. overcomingdisturbances,
d. All of above

11) The DSB category of AM system is generally used in ___________ == ?
a. Oscillator
b. Color information TV
c. Oscilloscope

12) Which is used to prevent power wastage on … _______ == ?
a. FDM
b. SSB
c. DSB

13) If ROC does not lie inside unit circle, then == ?
1) FFT converges
2) Z-Transfrom converges
3) Z-Transform Diverges

14) The control system is used for == ?

15) To decrease the power in control system we use == ?

16) What will be the sampling frequency that reveals the same sampled signal == ?

17) z transform is used when the system is not == ?

18) For a LTI system if all the zeroes and poles are inside the unit circle then == ?

19) Which modulation technique has carrier signal either 1 or 0 state == ?

20) Pole of s-plane gives the information about == ?

21) ROC converges if poles and zeros lies inside == ?

22) Which equation best represents AM power? == ?

Apr 5, 2008
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3. ### Abu Bakar Thread Starter New Member

Jun 26, 2015
2
0
here are some of the answers i found.

1) Infinite
2) Origin
3) QAM
4) Impulse Response
5) Mathematical model
6) Z-transform converges
7) critically damped
8) System is stable
9) 0>damping ratio<1
10) All of above
11) ?
12) ?
13) Z-Transfrom converges

4. ### WBahn Moderator

Mar 31, 2012
17,461
4,701
It one thing to "find" the answers. Which of these do you happen to "understand"?