Electronics and Communication Engineering - Automatic Control Systems

1. 

The first column of a Routh array is

How many roots of the corresponding characteristic equation are in left half s-plane?

A. 2
B. 3
C. 4
D. 5

Answer: Option B

Explanation:

Total number of roots is 5. Since two sign changes in first column, two roots are in right half plane.

Hence 3 roots in left half plane.


2. 

For the given figure, time constant RC = t. Then

A. t2s2 + 2ts + 1
B.
C. ts2 + 1
D.

Answer: Option B

Explanation:

.


3. 

The entries in the first column of Routh array of a fourth order are 5, 2, - 0.1, 2, 1. The number of poles in the right half plane are

A. 1
B. 2
C. 3
D. 4

Answer: Option B

Explanation:

Two sign changes and hence two poles in right half plane.


4. 

In Bode diagram (log magnitude plot) the factor (jω)n in the transfer function gives a line having slope

A. 20 dB/decade
B. 20n dB/decade
C.
D. -20n dB/decade

Answer: Option B

Explanation:

For (jω)n term the slope is (20 n) dB/decade.


5. 

The magnitude of transport lag factor is always zero.

A. True
B. False

Answer: Option B

Explanation:

It is not always zero.


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