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Learn Electronics

Electronic Devices & Circuits

Instructions

  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best.


1.     The value of transconductance decreases in simplified low frequency equivalent circuit of n-channel MOSFET due to increase in the value of _______
Source resistance
Load resistance
Both A and B
None of the above
2.     What is the effect of MOSFET biasing in the saturation region especially while representing the internal resistances and capacitances in n-channel E-MOSFET configuration?
Channel gets pinched off at the drain by increasing the value of Cgd
Channel gets pinched off at the source by increasing the value of Cgd
Channel gets pinched off at the drain by decreasing the value of Cgd upto zero
Channel gets pinched off at the source by decreasing the value of Cgd
3.     Which condition is applicable for a body to be more positive than source in a small signal equivalent circuit of N-type MOSFET inclusive of body effect?
Vbs > 0
Vbs < 0
Vbs = 0
None of the above
4.     Which among the below mentioned devices acts as a driver in CMOS Inverter Circuit?
PMOS
NMOS
Both A and B
None of the above
5.     Biasing of D-MOSFET in saturation or non-saturation region while using with depletion load device, specifically depends on ______
VDD & RS
VDD & VDS
VDD & ID
ID & Rs
6.     Which resistance plays a significant role in stabilization of Q-point for self-biasing circuit of BJT?
Emitter resistance
Collector resistance
Source resistance
Drain resistance
7.     Which among the below mentioned reasons is/are responsible for the occurrence of second breakdown phenomenon in power BJT?
Large current
Distribution of current in a non-uniform manner
Excessive power dissipation
All of the above
8.     Which among the following measures is/are adopted/used for improving the frequency stability in Colpitt's oscillator?
Clapp oscillator
Temperature stabilized chamber
Voltage regulators
All of the above
9.     According to the property of tuned circuit used in LC oscillators, the decay rate is proportional to________
Shape & size of current pulse
Time constant
Both A and B
None of the above
10.     Stability of a transfer gain is generally defined as the reciprocal of _______
Resistivity
Conductivity
Sensitivity
Desensitivity
11.    What would happen, if the signal Xd passes through the feedback network?
Xd will get multiplied by 'A'
Xd will get multiplied by 'β'
Xd will get multiplied by '1 – Aβ'
Xd will get multiplied by '1 + Aβ'
12.     What should be the value of unity gain frequency for a short circuit CE transistor with gain of 30 at 4MHz and cut-off frequency of about 100 kHz?
40 MHz
80 MHz
120 MHz
150 MHz
13.     Miller's theorem is applicable in a single stage CE hybrid π model in order to deal with ________
Series combination of Cc and rbc
Series combination of Ce and rbe
Parallel combination of Cc and rbc
Parallel combination of Ce and rbe
14.    Which among the below mentioned circuits resemble its behaviour similar to that of an amplifier in high frequency region, as the response decreases with an increase in frequency?
Simple high pass circuit
Simple low pass circuit
Simple band pass circuit
Simple band stop circuit
15.    Which among the below stated notations of h-parameters is used to represent the short-circuit forward current transfer ratio?
h11
h12
h21
h22
16.    Which among the below specified conditions is applicable to prevent the occurrence of thermal runaway in voltage divider bias circuit?
VCE < VCC / 2
VCE = VCC / 2
VCE > VCC / 2
None of the above
17.    On which factor/s do/does the value of thermal resistance depend?
Size of transistor
Type of cooling system
Type of heat transfer mechanism
All of the above
18.    Which capacitors assists in preventing the loss of gain due to negative feedback without affecting the DC stability of R-C Coupled amplifier?
Coupling Capacitors (CC)
Bypass capacitors (CE)
Both A and B
None of the above
19.    Which among the following is not an advantage of RC coupled amplifiers?
High fidelity
No core distortion
No impedance matching
Wide frequency response
20.    Which among the following oscillators are specifically preferred at high frequencies?
LC oscillators
RC oscillator
Both A and B
None of the above