NTA UGC NET/JRF Exam, June -2021 (Electronic Science)

Total Questions: 100

41. In enhancement type of MOSFET, at zero gate bias:

(a) Channel conductance is very low
(b) Channel conductance is very high
(c) Channel resistance is very low
(d) Channel resistance is very high
Choose the correct answer from the options given below:

Correct Answer: D. (a) and (d) only

42. The maximum operating frequency of a MOSFET is:

Choose the correct answer from the options given below:

Correct Answer: B. (a) and (d) only

43. In a Semiconductor Device operation, the current continuity equations are:

Choose the correct answer from the options given below:

Correct Answer: C. (c) and (d) only

44. In JFET, the current density in the x-direction is:

Choose the correct answer from the options given below:

Correct Answer: D. (a) and (b) only

45. In JFET, the transconductance in the saturation region is given by:

Choose the correct answer from the options given below:

Correct Answer: B. (b) and (c) only

46. Consider the system represented by y[n] = 2x[n] + 3:

(a) The system is linear.
(b) The system is non-linear.
(c) The system does not have homogeneity property.
(d) The system follows the additive property.
Choose the correct answer from the options given below:

Correct Answer: C. (b) and (c) only

47. Which of the following statements regarding the Fourier series are correct?

(a) For an even symmetry, only sine terms exist.
(b) For an even symmetry, only cosine terms exist.
(c) For an odd symmetry, only cosine terms exist.
(d) For an odd symmetry, only sine terms exist.
Choose the correct answer from the options given below:

Correct Answer: B. (b) and (d) only

48. Which of the following statements regarding Laplace and Fourier transforms are correct?

(a) In order for a function to possess a Laplace transform, it must obey the condition(b) In order for a function to possess a Laplace transform, it must obey the condition(c) For a function to have a Fourier transform, it must obey the condition(d) For a function to have a Fourier transform, it must obey the condition

Correct Answer: C. (b) and (d) only

49. Which of the following statements are correct?

(a) Schottky barriers are established by depositing a metal, such as Tungsten, on a p-type channel.
(b) The transfer characteristics of a depletion type MESFET are similar to those of a depletion type MOSFEТ.
(c) Maximum operating conditions are determined by the product of drain-tosource voltage and drain current.
(d) A complimentary MOSFET has negligibly small input impedance.
Choose the correct answer from the options given below:

Correct Answer: C. (b) and (c) only

50. Which of the following statements are correct?

(a) A multiplier can be used as a balanced demodulator or detector.
(b) Dynamic range compression is the process of reducing the peak-to-peak variation of a signal to a lower range.
(c) An antilogarithmic amplifier is useful for dynamic range compression.
(d) In a phase-locked loop circuit, the capture range is always larger than the lock range.
Choose the correct answer from the options given below:

Correct Answer: A. (a) and (b) only