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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 19
16.
Consider the differential amplifier shown in figure. (Assume β is very high).

IE(approximately) =
2 mA
1 mA
0.5 mA
3 mA
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
With regard to a transmission line, which of the following statements is correct?
Any impedance repeats itself every 1/4 on the Smith chart.
The S.W.R. = 2 circle and the magnitude of reflection coefficient = 0.5 circle coincide on the Smith chart.
At any point on a transmission line, the current reflection coefficient is the reciprocal of the voltage reflection coefficient.
Matching eliminates the reflected wave between the source and the matching device location.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Consider an input x(t) as shown

System impulse response is:

If input is passed through this system then output will be zero except
-2 < t < 6
0 < t < 11
-2 < t < 5
2 < t < 6
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Which of the following quantities cannot be measured/determined using Hall effect?
Type of semiconductor (p or n)
Mobility of charge carriers
Diffusion constant
Carrier concentration
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Period of the signal is:
8
1
24
16
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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