Electronics and Communication Engineering - Exam Questions Papers

46. 

The equivalent circuit for the following network is :

A.
B.
C.
D.

Answer: Option A

Explanation:


47. 


ωH =

A. 108 rad/sec
B. 104 rad/sec
C. 102 rad/sec
D. 10 rad/sec

Answer: Option A

Explanation:

R = 10 || 10 = 5 KΩ

.


48. 

The given characteristic polynomial s4 + s3 + 2s2 + 2s + 3 = 0 has

A. zero root in RHS of s-plane
B. one root in RHS of s-plane
C. two roots in RHS of s-plane
D. three roots in RHS of s-plane

Answer: Option C

Explanation:

By Routh's Array

When ε -> 0, two sign changes in the first column, so there are two roots in RHS plane.


49. 

In n-well CMOS fabrication substrate is:

A. heavily doped n-type
B. heavily doped p-type
C. lightly doped n-type
D. lightly doped p-type

Answer: Option D

Explanation:

Lightly doped p-type.


50. 

The transfer function of a zero-order-hold system is :

A. (l/s)(l + e-sT)
B. (1/s)(1 - e-sT)
C. 1 - (l/s)e-sT
D. 1 + (1/s)e-sT

Answer: Option B

Explanation:

.


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