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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 4
41.
The magnitude plot of a rational transfer function G(s) with real coefficients is shown below. Which of the following compensators has such a magnitude plot?
Lead compensator
Lag compensator
PID compensator
Lead-lag compensator
Answer: Option
Explanation:

Since magnitude plot shows both increasing as well as decreasing plot, it is lead-lag compensator.

42.
The circuit shown in the figure converts
BCD to Binary code
Binary to excess - 3 code
Excess - 3 to Gray
Gray to Binary
Answer: Option
Explanation:

Let input is 1 1 0 1

y1 = x1

y2 = x2 ⊕ x1 ⇒ 1 ⊕ 1 = 0

y3 = x3 ⊕ x2 = 0 ⊕ 0 = 0

y4 = x4 ⊕ x3 = 1 ⊕ 0 = 1

if input is gray then y1 y2 y3 y4 will be Binary.

43.
Using 4-bit numbers (n = 4) if k = (0011)2 how is k expressed in 2's complement.
(1011)2
(1101)2
(1100)2
(0101)2
Answer: Option
Explanation:

In 2's complement

Simply find 2s complement

⇒ (0011)2 ⇒ 1100 + 1 ⇒ (1101)2 .

44.
Which of the following options is the closest in meaning to the world below:
Circuitous
cyclic
indirect
confusing
crooked
Answer: Option
Explanation:

Circuitous means round about or not direct. Therefore the closest in meaning will be indirect.

45.
System is :
causal
stable
non causal
anticausal
Answer: Option
Explanation:

ROC is towards infinity hence the signal is causal. Now the ROC does not contain the unit circle hence the system is unstable.

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