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

Total Questions: 100

81. Compare the IC logic families based on their rise time in ascending order:

(a) MECL
(b) CМОS
(c) Low power schottky TTL
(d) PECL
Choose the correct answer from the options given below:

Correct Answer: A. (d), (a), (c), (b)

82. Arrange the following in ascending order of Molecular density in various regions of ionosphere:

(a) F, Layer
(b) F₂ Layer
(c) D Layer
(d) E Layer
Choose the correct answer from the options given below:

Correct Answer: C. (b), (a), (d), (c)

83. Arrange the following in decreasing order of the noise generated by them:

(a) Diode
(b) Transistor
(c) Avalanche photo diode
(d) FET
Choose the correct answer from the options given below:

Correct Answer: A. (c), (b), (d), (a)

84. Arrange the following in terms of their dielectric strength in ascending order:

(a) Bakelite
(b) Mica
(c) Paper (impregnated)
(d) Teflon
Choose the correct answer from the options given below:

Correct Answer: B. (a), (c), (d), (b)

85. Arrange the following thermal sensors in ascending order of their cost for an application:

(a) Thermocouple
(b) Thermistor
(c) Resistance Temperature Detector (RTD)
(d) IR Photodiode
Choose the correct answer from the options given below:

Correct Answer: B. (a), (b), (c), (d)

86. For JFET and MOSFET, consider the following statements:

(a) MOSFET is a voltage controlled capacitor
(b) BJT is slower than FET
(c) Input impedance of MOSFET is greater 'than JFET
(d) Leakage currents are zero in FET
(e) MOSFET are slower than JFET
Choose the correct answer from the options given below:

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

87. Given below are two statements:

Statement I: Turbo codes exhibits performance, in terms of bit error probability, that is very close to the Shannon limit and can be efficiently implemented for high speed use.
Statement II: Convolutional codes provide worst performance in noisy channels where a high proportion of the bits are in error.
In the light of the above statements, choose the correct answer from the options given below:

Correct Answer: C. Statement I is true, but Statement II is false

88. Given below are two statements:

Statement I: In proportional control, the actuating signal for the control action in a control system is proportional to the error signal.
Statement II: It is desirable that control system be over damped for the point of view of quick response.
In the light of the above statements, choose the correct answer from the options given below:

Correct Answer: C. Statement I is true, but Statement II is false

89. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): The biggest advantage of using a PROM as a programmable logic device is that its design can be changed and modified rapidly.
Reason (R) : The PROM can generate any possible logic function of input variables because it generates every possible AND product term.
In the light of the above statements, choose the correct answer from the options given below:

Correct Answer: B. Both (A) and (R) are true, but (R) is the correct explanation of (A)

90. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): Power MOSFETs have a positive temperature coefficient, which combats the possibility of thermal runaway.
Reason (R): Negative temperature coefficient results in decreased level of resistance with increase in temperature and causes thermal runaway.
In the light of the above statements, choose the correct answer from the options given below:

Correct Answer: A. Both (A) and (R) are true and (R) is the correct explanation of (A)