Analog Electronics MCQ Questions Electrical Engineering

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About Analog Electronics

Below are best multiple choice questions on Analog Electronics along with answers that help you to revise your Analog Electronics skills before exams.

Analog Electronics MCQ Questions With Answers

Q1. Voltage Series (feedback also called series-shunt feedback) results in

  • Increase in both input & output impedances
  • Decreases in both input & output impedances
  • Increase in input impedance & decreases in output impedance
  • Decrease in input impedance & increase in output impedance

Q2. A voltage with square waveform having values of +5V and 0V is

  • wifi signal
  • digital signal
  • current signal
  • analog signal

Q3. The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.

  • True
  • False

Q4. The diode current equation is not applicable in ____________

  • Forward biased state
  • Reverse biased state
  • Unbiased state
  • It is applicable in all bias states

Q5. The threshold voltage of a diode at Antarctica and India were found to be V1 and V2 respectively. Which of the following relations between V1 and V2 hold good?

  • V1 > V2
  • V1 = V2
  • V1 < V2
  • Can’t be determined

Q6. An exponential amplifier has diode in feedback path.

  • True
  • False

Q7. The abbreviation PIV in the case of a diode stands for ____________

  • Peak Inferior Voltage
  • Problematic Inverse Voltage
  • Peak Inverse Voltage
  • Peak Internal Voltage

Q8. Colpitts oscillator consists of _____ capacitor and _______ inductor

  • one, one
  • one, two
  • two, two
  • two, one

Q9. Reverse collector saturation current ICBO is __________

  • Collector current when emitter current is zero
  • Collector current when base current is zero
  • Same as reverse saturation current
  • Collector current when either emitter or base current is zero

Q10. In a common emitter, unbypassed resister provides

  • voltage shunt feedback
  • current series feedback
  • negative voltage feedback
  • positive current feedback

Q11. In a half wave rectifier, the input sine wave is 250sin100 ᴨt Volts. The output ripple frequency of rectifier will be __________

  • 100 Hz
  • 200 Hz
  • 50 Hz
  • 25 Hz

Q12. A 10 V power supply would use which filter capacitor?

  • paper capacitor
  • electrolytic capacitor
  • mica capacitor
  • air capacitor

Q13. The coupling capacitor in amplifier circuits

  • affects dc biasing
  • does not affect dc biasing
  • affects dc biasing to some extent
  • both (a) and (c)

Q14. The effective channel length of a MOSFET in a saturation decreases with increase in

  • Gate voltage
  • Drain voltage
  • Source voltage
  • Body voltage

Q15. The cascade amplifier is a multistage configuration of

  • CC-CB
  • CE-CB
  • CB-CC
  • CE-CC

Q16. For high frequencies a capacitor like

  • an open circuit
  • a short circuit
  • either open circuit or short circuit
  • none of the above

Q17. What will happen if doping of an intrinsic semiconductor with pentavalent impurity atom ?

  • Fermi level not change
  • Fermi level fall
  • Fermi level raises
  • All of the above

Q18. Which of the following power amplifiers has highest efficiency?

  • Class A
  • Class AB
  • Class B
  • Class C

Q19. The input voltage for starting oscillations in an oscillator is caused by

  • negative feedback
  • positive feedback
  • noise voltage in resistors
  • a special generator

Q20. In a push pull circuit

  • each transistor conducts for 180°
  • each transistor conducts for more than 180° but less than 360°
  • each transistor conducts for less than 180°
  • the period of conduction of each transistor depends on circuit configuration

Q21. In a half wave diode rectifier circuit the current flows in the load circuit for

  • 90° in each cycle
  • 180° in each cycle
  • 270° in each cycle
  • 360° in each cycle

Q22. An RC oscillator uses

  • one RC combination
  • two RC combinations
  • at least three RC combinations
  • either (a) or (b)

Q23. Which power amplifier can deliver maximum load power?

  • Class A
  • Class AB
  • Class B
  • Class C

Q24. In a CE amplifier the input impedance is equal to the ratio of

  • ac base voltage to ac base current
  • ac base voltage to ac emitter current
  • ac emitter voltage to ac collector current
  • ac collector voltage to ac collector current

Q25. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use

  • surge resistor
  • surge inductor
  • surge capacitor
  • both (a) and (b)

Q26. Which of the following oscillators is suitable for frequencies in the range of mega hertz?

  • RC phase shift
  • Wien bridge
  • Hartley
  • Both (a) and (c)

Q27. How is BJT used as a faster switch?

  • By operating it in the saturation and cut-off region
  • By operating it in the active and cut-off region
  • By using it in strong saturation
  • By decreasing its ON resistance

Q28. Thermal runaway is not possible in FET because as the temperature of FET increases

  • The mobility decreases
  • The transconductance increases
  • The drain current increases
  • None of the above

Q29. The encapsulation of transistor is necessary for

  • Preventing radio interference
  • Preventing photo-emission effects
  • Avoiding loss of free electrons
  • Mechanical ruggedness

Q30. In a transistor leakage current mainly depends on

  • Doping of base
  • Size of emitter
  • Rating of transistor
  • Temperature

Q31. The early effect in a bipolar junction transistor is caused by

  • Fast turn-on
  • Fast turn-off
  • Large collector-base reverse bias
  • Large emitter-base forward bias

Q32. The bandwidth of an RF tuned amplifier is dependent on

  • Q –factor of the tuned o/p circuit
  • Q –factor of the tuned i/p circuit
  • Quiescent operating point
  • Q-factor of the o/p and i/p circuits as well as quiescent operating point

Q33. A change in the value of the emitter resistance Re in a differential amplifier

  • Affects the difference mode gain Ad
  • Affects the common mode gain Ac
  • Affects both Ad and Ac
  • Does not effect either Ad and Ac

Q34. The current gain of a BJT is

  • gm r0
  • gm / r0
  • gm rπ
  • gm /rπ

Q35. In a CB amplifier the maximum efficiency could be

  • 99%
  • 85%
  • 50%
  • 25%

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