Quiz  /  Analog Electronics MCQ Questions and Answers

  • 1. 
    The early effect in a bipolar junction transistor is caused by . 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

  • 2. 
    MOSFET can be used as a . MOSFET can be used as a

  • current controlled capacitor
  • voltage controlled capacitor
  • current controlled inductor
  • voltage controlled inductors

  • 3. 
    Thermal runaway is not possible in FET because as the temperature of FET increases . 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

  • 4. 
    A source follower using an FET usually has a voltage gain which is . A source follower using an FET usually has a voltage gain which is

  • greater than +100
  • slightly less than unity but positive
  • exactly unity but negative
  • about -10

  • 5. 
    A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode . A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by

  • 2
  • 1
  • 1/2
  • 0

  • 6. 
    The approximate input impedance of the OPAMP circuit which has . The approximate input impedance of the OPAMP circuit which has Ri=10k,Rf=100k,RL=10k

  • ∞
  • 120k
  • 110k
  • 0k

  • 7. 
    A change in the value of the emitter resistance Re in a differential amplifier . A change in the value of the emitter resistance Re in a differential amplifier OBJECTIVE QUESTIONS IN ANALOG ELECTRONICS

  • affects the difference mode gain Ad
  • affects the common mode gain Ac
  • affects both Ad and Ac
  • does not effect either Ad and Ac

  • 8. 
    A differential amplifier is invariably used in the i/p stage of all OP-AMPs.This is dome . A differential amplifier is invariably used in the i/p stage of all OP-AMPs.This is dome basically to provide the OP-AMPs with a very high

  • MRR
  • bandwidth
  • slew rate
  • open-loop gain

  • 9. 
    The effective channel length of a MOSFET in a saturation decreases with increase in 0. The effective channel length of a MOSFET in a saturation decreases with increase in

  • gate voltage
  • rain voltage
  • source voltage
  • body voltage

  • 10. 
    Which of the following is not associated with a p-n junction 1. Which of the following is not associated with a p-n junction

  • junction capacitance
  • charge storage capacitance
  • depletion capacitance
  • hannel length modulation

  • 11. 
    In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at 2. In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at

  • the edge of the depletion region on the p-side
  • the edge of the depletion region on the n-side
  • the p-n junction
  • the center of the depletion region on the n-side

  • 12. 
    An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an 3. An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is

  • 0.25
  • .5
  • 0.75
  • 1

  • 13. 
    In a common emitter, unbypassed resister provides 4. In a common emitter, unbypassed resister provides

  • voltage shunt feedback
  • current series feedback
  • egative voltage feedback
  • positive current feedback

  • 14. 
    A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal 5. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be

  • 1 v
  • 2v
  • 1.4v
  • 2.8v

  • 15. 
    Class AB operation is often used in power large signal) amplifiers in order to 6. Class AB operation is often used in power large signal) amplifiers in order to

  • get maximum efficiency
  • remove even harmonics
  • overcome a crossover distortion
  • reducing collector dissipation

  • 16. 
    The bandwidth of an RF tuned amplifier is dependent on 7. 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

  • 17. 
    If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be 8. If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be

  • 2.3mA
  • 3.2mA
  • 4.6 mA
  • .2mA

  • 18. 
    The MOSFET switch in its on-state may be considered equivalent to 9.The MOSFET switch in its on-state may be considered equivalent to

  • resistor
  • inductor
  • apacitor
  • battery

  • 19. 
    Most of the linear ICs are based on the two-transistor differential amplifier because of its 0. Most of the linear ICs are based on the two-transistor differential amplifier because of its

  • input voltage dependent linear transfer characteristic
  • high voltage gain
  • high input resistance
  • high CMRR

  • 20. 
    Negative feedback in an amplifier 1. Negative feedback in an amplifier

  • Reduces gain
  • Increase frequency &phase distortion
  • Reduces bandwidth
  • Increases noise

  • 21. 
    A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load 2. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are

  • 5 Ω & 20 %
  • 25 Ω & 20 %
  • 5 Ω & 16.7 %
  • 25 Ω & 16.7 %

  • 22. 
    The current gain of a bipolar transistor drops at high frequencies because of 3. The current gain of a bipolar transistor drops at high frequencies because of

  • Transistor capacitances
  • High current effects in the base
  • Parasitic inductive elements
  • The early effect

  • 23. 
    The ideal OP-AMP has the following characteristics. 4. The ideal OP-AMP has the following characteristics.

  • Ri=∞ ,A=∞ ,R0=0
  • Ri=0 ,A=∞ ,R0=0
  • Ri=∞ ,A=∞ ,R0=∞
  • Ri=0 ,A=∞ ,R0=∞

  • 24. 
    An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this 5. An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are

  • fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
  • fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
  • fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
  • fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

  • 25. 
    A 741-type OP-AMP has a gain-bandwidth product of 1MHz.A non-inverting amplifier 6. A 741-type OP-AMP has a gain-bandwidth product of 1MHz.A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of

  • 50 KHz
  • 100KHz
  • 1000/17 KHz
  • 1000/7.07 KHz

  • 26. 
    An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier 7.An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed

  • 795mV
  • 395mV
  • 795 mV
  • 39.5mV

  • 27. 
    In the differential voltage gain & the common mode voltage gain of a differential amplifier 8. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is

  • 23dB
  • 25dB
  • 46dB
  • 50dB

  • 28. 
    Generally, the gain of a transistor amplifier falls at high frequencies due to the 9. Generally, the gain of a transistor amplifier falls at high frequencies due to the

  • Internal Capacitance of the device
  • Coupling capacitor at the input
  • Skin effect
  • Coupling capacitor at the output

  • 29. 
    An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output 0. An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is

  • 1/11KΩ
  • 1/5KΩ
  • 5KΩ
  • 11KΩ

  • 30. 
    The action of JFET in its equivalent circuit can best be represented as a 1. The action of JFET in its equivalent circuit can best be represented as a

  • Current controlled Current source
  • Current controlled voltage source
  • Voltage controlled voltage source
  • voltage controlled current source

  • 31. 
    Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ 2. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is

  • 49dB
  • 51dB
  • 98dB
  • 102dB

  • 32. 
    An ideal OP-AMP is an ideal 3. An ideal OP-AMP is an ideal

  • Current controlled Current source
  • Current controlled voltage source
  • Voltage controlled voltage source
  • voltage controlled current source

  • 33. 
    In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the 4. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is.

  • Vdc = Vm/π, PIV=2Vm
  • Vdc = 2Vm/π, PIV=2vm
  • Vdc = 2Vm/π, PIV=Vm
  • Vdc = Vm/π, PIV=Vm

  • 34. 
    The cascade amplifier is a multistage configuration of 5. The cascade amplifier is a multistage configuration of

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

  • 35. 
    The current gain of a BJT is 6. The current gain of a BJT is

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

  • 36. 
    The most commonly used amplifier in sample & hold circuits is 7. The most commonly used amplifier in sample & hold circuits is

  • A unity gain non-inverting amplifier
  • A unity gain inverting amplifier
  • An inverting amplifier with a gain of 10
  • An inverting amplifiers with a gain of 100

  • 37. 
    Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point 9. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in

  • Only the temperature
  • only the β of the transistor
  • Both Temperature & β
  • None of the above

  • 38. 
    Voltage Series feedback also called series-shunt feedback) results in 0. 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
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