Electronics and Communication Engineering - Exam Questions Papers

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?

A. Lead compensator
B. Lag compensator
C. PID compensator
D. Lead-lag compensator

Answer: Option D

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

A. BCD to Binary code
B. Binary to excess - 3 code
C. Excess - 3 to Gray
D. Gray to Binary

Answer: Option D

Explanation:

Let input is 1 1 0 1

y1 = x1

y2 = x2x1 ⇒ 1 ⊕ 1 = 0

y3 = x3x2 = 0 ⊕ 0 = 0

y4 = x4x3 = 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.

A. (1011)2
B. (1101)2
C. (1100)2
D. (0101)2

Answer: Option B

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

A. cyclic
B. indirect
C. confusing
D. crooked

Answer: Option B

Explanation:

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


45. 

System is :

A. causal
B. stable
C. non causal
D. anticausal

Answer: Option A

Explanation:

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