Electronics and Communication Engineering - Exam Questions Papers

41.
The characteristic equation of a control system is given as s4 + 8s3 + 24s2 + 32s + K = 0. What is the range of values of K for this system to be stable?
0 ≤ K < 80
0 ≤ K < 100
0 ≤ K < 2300
0 ≤ K < 600
Answer: Option
Explanation:
No answer description is available. Let's discuss.

42.
If a vector field is related to another vector field through which of the following is true? Note: C and Sc refer to any closed contour and any surface whose boundary is C.
Answer: Option
Explanation:
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43.
A scheme shown below is to generate a wide band FM modulate signal.

Narrow band FM has carrier frequency = 400 KHz
Deviation ratio = 0.2
Wide band FM has carrier frequency = 100 MHz
Deviation ratio = 6
Frequency multiplication factor is:
30
6
250
12
Answer: Option
Explanation:
No answer description is available. Let's discuss.

44.
An amplitude modulated signal occupies a frequency range from 395 kHz to 405 kHz. If can be demodulated by which of the following?
Using an envelope detector and filter
Multiplying with a 395 kHz local signal
Multiplying with a 405 kHz local signal
Low pass filtering with cut off at 400 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
Following one is moving average system __________ .
Answer: Option
Explanation:
No answer description is available. Let's discuss.