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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 7
46.
A 16 bit type ADC uses 1 MHz clock its maximum conversion time is __________ .
16 μs
15 ms
6.5 ms
66 ms
Answer: Option
Explanation:

Conversion time =

⇒ ⇒ 6.5 m sec.

47.
A 300 MHz plane EM wave is propagating in free space. The wave is incident normally on an infinite copper slap. The antenuation constant for the wave is (σcopper = 5.8 x 107 mho/ m)
262 x 103
254 x 103
352 x 103
354 x 103
Answer: Option
Explanation:

Attenuation constant : .

48.
Transmitted voltage level is:
11
7.8
7.348 V
none of these
Answer: Option
Explanation:

= 61 + 0.5 = 61.5 = 7.348 V.

49.
Which of the following is neither power nor energy signal?
sin 2t + cos 3t
ramp
none of these
Answer: Option
Explanation:

(A) is periodic thus power signal.

(B) is non periodic but finite thus energy signal.

(C) is non periodic but energy contain is infinite.

Thus it is neither power nor energy signal.

50.
A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10 etc.
What would be the RMS value of a sine wave having the same peak value as that of the above mentioned periodic wave?
42.2 V
19.098 V
38.2 V
none of these
Answer: Option
Explanation:

R.M.S. value of a sine wave of the square peak == 42.2 V.

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