Electronics and Communication Engineering - Exam Questions Papers

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:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.

9. 

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

  1. Current in the circuit is in phase with applied voltage
  2. Voltage drop across capacitor C and inductance L are equal in magnitude.
  3. Voltage across the capacitor is equal in magnitude to the applied voltage.
  4. 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:

No answer description available for this question. Let us discuss.

10. 

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

A. BJT
B. SCR
C. MOSFET
D. UJT

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.