NTA UGC NET/JRF Exam, June -2020 (Electronic Science)

(a) The applied voltages control the boundary densities through the term exp(qV/kT)
(b) The base current is the difference between the emitter and collector currents
(c) In order to maximize emitter resistance, the emitter contact is usually made directly on top of the emitter
(d) Emitter Bandgap narrowing increases current gain
(e) Emitter and collector currents are given by the minority density gradients at the junction boundaries
Choose the most appropriate answer from the options given below:

where Rₛ is series resistance;
Lₛ is series inductance:
Cⱼ is junction capacitance;
-Rₛ is negative resistance
Choose the most appropriate answer from the options given below:

(a) LEED
(b) EMP
(c) TEM
(d) STEM
(e) EELS
Choose the correct answer from the options given below:

(a) W
(b) Mo
(c) Al
(d) TiN
(e) WSi₂
Choose the correct answer from the options given below:

(a) Phosphine
(b) Argon
(c) Nitrogen Oxide
(d) Silane
(e) Nitrogen
Choose the most appropriate answer from the options given below:

The correct values of Y parameters are:Choose the correct answer from the options given below:

(a) All the links of a tree together does not constitute the complement of the corresponding tree
(b) A connected subgraph of a connected graph is a tree if there exist (n - 1) nodes of the group
(c) A connected subgraph of a connected graph is a tree if there exists many paths between any pair of nodes in it
(d) The number of terminal nodes or end vertices of every tree are atleast two
(e) Every connected graph has atleast one tree
Choose the correct answer from the options given below:

(a) Precision rectifiers use positive feedback to compensate for the forward drop of the diodes
(b) Precision peak detector uses a capacitor to effectively lengthen the duration of the peaks
(c) Limiters may be thought of as programmable signal clippers
(d) In order to improve performance of comparators negative feedback may be used
(e) There are two basic approaches for realizing a design: (1) using zener diodes and (2) using biased-signal diode network Choose the most appropriate answer from the options given below:

(a) The main purpose of a compensating network is to modify the performance of op-amp ciruit over the desired frequency range
(b) There are two types of op-amps: internally compensated and externally compensated
(c) 741 С is an externally compensated oрamp while 709 C is internally compensated op-amp
(d) The phase lag and phase lead are most commonly used compensating networks in op-amps
(e) Phase lag contributes a positive phase angle and phase lead a negative phase angle
Choose the most appropriate answer from the options given below:

(a) CPLDs have much higher capacity than SPLDs
(b) FPGAs are similar to CPLDs in their internal organization
(c) Two basic classes of FPGAs are course grained and fine grained
(d) Fine grained FPGA has large logic blocks while course-grained FPGA has much smaller logic blocks
(e) FPGAs come in package and ranging less than 1000 pins.
Choose the most appropriate answer from the options given below: