NTA UGC NET/JRF Exam, September-2022 (Electronic Science)

Total Questions: 100

11. A two-port network is reciprocal if and only if:

Correct Answer: E. (*)

12. A K-step function is shown in the following figure :

The Laplace transform of the function f(t) will be:

Correct Answer: B.

13. An essential requirement of n well designed choke input filter is:

Correct Answer: D. Xʟ be much greater than X𝔠 at input frequency

14. The total output offset voltage of an operational amplifier is a function of these effects.

Correct Answer: A. Input offset voltage and Input bias currents

15. An Audio pre-amplifier needs to reproduce as high as 20 kHz. The maximum output swing is 10 V peak. The minimum acceptable slew rate for the op-amp used is:

Correct Answer: B. 1.257 V/μs

16. which of the following terms is not applicable for Absolute-value output circuit?

Correct Answer: B. Gain of the circuit is greater than 1

17. Consider the expression Y = P ⊕ Q ⊕ R where P, Q, R are the input variables and Y is the output variable. Y will be logic 0 if:

(a) an odd number of input variables are 1
(b) an even number of input variables are 1
(c) an odd number of input variables are 0
(d) an even number of input variables are 0
(e) an odd number of input variables between 0 and 1
Choose the correct answer from the options  given below:

Correct Answer: D. (b) only

18. Transmission line of the driving gate is represented by load equal to characteristic impedence of the line Z₀. What is the behaviour of following transmission line circuit when a pulse is applied to the transmission line?

Correct Answer: C. Overshoot and ringing after several reflection

19. Which of the following is true about a tracking A/D converter?

Correct Answer: D. It uses up/down counter

20. A 4-bit synchronous counter uses flip-flops with propagation delay of 20 ms each. The maximum possible time required to change of state will be:

Correct Answer: A. 20 ms