Analog Circuits MCQ

Test your knowledge with important Analog Circuits MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Analog Circuits MCQs at Bissoy

• In the IC 7805, what is the minimum input voltage for proper functioning?
  ক

  5V

  খ

  6V

  গ

  7V

  ঘ

  8V
• What is the output of the IC 7924?
  ক

  12V

  খ

  -12V

  গ

  24V

  ঘ

  -24V
• In a transistorized series regulator, how is the overload and short-circuit protection provided?
  ক

  By the use of a thermistor

  খ

  By using two additional diodes and a current sensing resistor to protect the series transistor

  গ

  By using a diode and an additional resistor to protect the transistor

  ঘ

  By using a diode along with a capacitor of a small capacitance value in series
• What is not related to a transistorized series regulator?
  ক

  The output can be varied by using a variable resistor

  খ

  The output is independent of temperature

  গ

  The overload and short circuit protection is not required

  ঘ

  The circuit has negative feedback responsible for regulation
• The following is a shunt regulator. Find maximum power dissipation of the Zener diode and transistor, given that the source voltage varies from 20-40V, the Zener breakdown voltage is 5V, the output voltage is 10V, the resistance R1=50Ω, R2=20kΩ, β=99, VBE=0.5V.
  ক

  PTransistor = 5.12 W, PZener = 0.051 W

  খ

  PTransistor = 0.41 W, PZener = 0.57 W

  গ

  PTransistor = 5.94 W, PZener = 0.057 W

  ঘ

  PTransistor = 6.22 W, PZener = 5.66 W
• Consider the circuit shown and find the percentage increase in power dissipation of the transistor if the source voltage increases by 10%. Given that the breakdown voltage is 5V, R1=10kΩ, R2=100kΩ, R3=200kΩ, R4=10Ω. The source voltage VS=25V.
  ক

  10%

  খ

  20.22%

  গ

  14.28%

  ঘ

  15.66%
• In the Zener controlled series regulator shown below, find the current through the Zener diode. Given that the Zener diode breakdown voltage is 5V, the source voltage is 15V, the output voltage is 10V, R4 = 2kΩ, β=99, R1=2kΩ.
  ক

  5.05 mA

  খ

  4.95 mA

  গ

  3.33 mA

  ঘ

  0
• Consider the following circuit. Find the power dissipation of the transistor given that the diode breakdown voltage is 5V, R1=20kΩ, R2=100kΩ, R3=200kΩ, R4=10Ω. The source voltage VS=20V.
  ক

  12.12W

  খ

  9.375W

  গ

  9.27W

  ঘ

  10.575W
• Consider the op-amp circuit shown. The breakdown voltage of the Zener is 5V. β for the transistor is 100. R1=10kΩ, R2=90kΩ, R3=30kΩ, R4=50kΩ. Calculate the total output voltage.
  ক

  20V

  খ

  30V

  গ

  5V

  ঘ

  50V
• In a power supply, the output voltage can vary due to multiple reasons. Which of these is not true if it is found that the output voltage is constant?
  ক

  The voltage stability factor is very high

  খ

  The output resistance is zero

  গ

  The temperature coefficient is zero

  ঘ

  The voltage stability factor is very small
• Which of these is a not drawback of Zener diode shunt regulator?
  ক

  The output voltage is fixed

  খ

  The output voltage can vary with temperature

  গ

  Variation in load current needs to be minimal

  ঘ

  It is difficult to design
• In the figure below, the voltage V1 ranges from 15 to 35V. The load current is 20mA. The diode knee current is 2 mA, the breakdown voltage is 5V and power rating is 200 mW. Calculate the range of R2 for the circuit to behave properly as a regulator.
  ক

  400Ω =< R2 =< 500Ω

  খ

  450Ω =< R2 =< 500Ω

  গ

  454Ω =< R2 =< 500Ω

  ঘ

  454Ω =< R2 =< 600Ω
• The following circuit is provided. Given that V1 varies from 20V to 50V, the diode breakdown voltage is 5V, the knee current is 1mA and the current is 9 mA across R1, find the maximum value of R2.
  ক

  4500Ω

  খ

  1500Ω

  গ

  2000Ω

  ঘ

  5000Ω
• Find the power rating of the diode in the given circuit. The breakdown voltage of the diode is 5V.
  ক

  200 mW

  খ

  125 mW

  গ

  250 mW

  ঘ

  300 mW
• What is load regulation?
  ক

  The process of keeping the load voltage constant irrespective of any change in AC supply

  খ

  The process of keeping the load voltage constant irrespective of variations in load current

  গ

  The process of keeping load voltage constant irrespective of variations in source current

  ঘ

  The process of keeping load current constant irrespective of variations in AC supply
• What is line regulation?
  ক

  The process of keeping Zener diode voltage constant inspite of changes in AC supply

  খ

  The process of keeping load voltage constant irrespective of the fluctuation in AC supply or the line voltage

  গ

  The process of keeping load voltage constant irrespective of fluctuation in load current

  ঘ

  The process of keeping Zener current constant irrespective of fluctuation in AC supply
• For a Zener diode shunt regulator, the source current is IS, the Zener diode current is IZ and the load current is IL. The source voltage is VS, Zener voltage is VZ and load voltage is VL. The load resistance is RL. What is the correct option for the safe operation of the diode?
  ক

  IS = IZ + IL

  খ

  IS =< IZmax + IL

  গ

  IS =< IZmin + IL

  ঘ

  VL = VZ
• Consider the circuit shown below where the breakdown voltage of the diode is 5V. Source voltage varies between 6V to 12V. Find the maximum current through the R2, given that R1=2kΩ and R2=5kΩ.
  ক

  3.5 mA

  খ

  1 mA

  গ

  1.4mA

  ঘ

  0.2 mA
• What is IC 723?
  ক

  A voltage regulator

  খ

  A full-wave rectifier

  গ

  A half-wave rectifier

  ঘ

  A clipper
• An op-amp uses a level shifter internally to prevent the loading effect.
  ক

  True

  খ

  False
• Consider the circuit shown. The input VI = 10sin2π106t. Calculate the duty cycle of the output.
  ক

  0.43

  খ

  0.065

  গ

  0.36

  ঘ

  0.5
• Given that the PSRR of an op-amp is 120dB. The supply lies between 12V to 15V. Calculate the change in the input offset voltage.
  ক

  3μV

  খ

  ±3μV

  গ

  ±3×10-12V

  ঘ

  -3V
• What is incorrect regarding the output offset voltage of op-amp?
  ক

  It is the output when the input voltage at both input pins of op-amp is zero

  খ

  It occurs due to dissimilarities in the internal structure of the op-amp

  গ

  The output offset voltage does not depend on the supply voltage

  ঘ

  The output offset voltage can be in the units of Volts
• The current flowing into one input of the op-amp is 12nA and it is 10 nA in the other. Find the input offset current.
  ক

  1nA

  খ

  2nA

  গ

  -2nA

  ঘ

  11nA
• Given an op-amp who’s gain is unknown but the output is saturated, which of the following is not possible?
  ক

  No feedback is being applied

  খ

  Negative feedback is applied while input is more than –VSat/AOL

  গ

  Positive feedback is applied

  ঘ

  Negative feedback is applied while the input is more than VSat/AOL
• Consider a practical op-amp where the power supply is VCC = +12V and VEE = -12V. The open loop gain is 106 and open loop bandwidth is 5Hz. What is the maximum positive input before which the output is saturated?
  ক

  12 mV

  খ

  0.012 mV

  গ

  24 mV

  ঘ

  12V
• Which of these is wrong for an all-pass filter?
  ক

  It is used for phase equalization in a communication system

  খ

  It is used in landline communication

  গ

  Its phase shift is -2tan-1RC, between 0 to -180°

  ঘ

  It can be made using a single op-amp
• Which of these is incorrect for a band-stop filter?
  ক

  An adder is required when designing it using LPF and HPF

  খ

  LPF and HPF are connected in parallel

  গ

  The HPF cut-off frequency should be much higher than LPF cut-off frequency

  ঘ

  The LPF and HPF are connected in series
• Consider the following circuits. If a band-pass filter is created by using the above two circuits in cascade, find the correct relation from the choices below.
  ক

  R4C2 >> R1C1

  খ

  R4C2 << R1C1

  গ

  R6R5 = R2C3

  ঘ

  R4C2 = R1C1
• Given a second-order Butterworth HPF, find the maximum gain magnitude.
  ক

  1.586 dB

  খ

  4 dB

  গ

  2.66 dB

  ঘ

  1 dB