Electronics and Communication Engineering - Exam Questions Papers

Exercise :: Exam Questions Papers - Exam Paper 20
6.
Consider the function where F(s ) is the Laplace transform of f(t) . What is the steady-state value of f(t) ?

A.
Zero B.
One C.
Two D.
A value between - 1 and + 1

Answer: Option D

Explanation:

7.
The Nyquist plot of a stable, transfer function G (s ) is shown in the figure. We are interested in the stability of the closed loop system in the feedback configuration shown. Which of the following statements is true?

A.
G(s ) is an all-pass filter B.
G(s ) has a zero in the right-half plane C.
G(s ) is the impedance of a passive network D.
G(s ) is marginally stable

Answer: Option C

Explanation:

8.
The output y (t ) of a continuous-time system S for the input x (t ) is given by: Which of the following is incorrect?

A.
S is linear and time-invariant B.
S is linear and time-varying C.
S is non-linear and time-invariant D.
S is non-linear and time-varying

Answer: Option A

Explanation:

9.
Consider the following statements regarding the properties of an R-L-C series circuit under resonance:

Current in the circuit is in phase with applied voltage Voltage drop across capacitor C and inductance L are equal in magnitude. Voltage across the capacitor is equal in magnitude to the applied voltage. Current in the circuit is maximum. Which of the above statements is/are correct?

A.
1 only B.
1, 2 and 4 C.
2 and 4 D.
1, 3 and 4

Answer: Option B

Explanation:

10.
Which of the following devices is used at the first stage of an electronic voltmeter?

Answer: Option C

Explanation: