Electronic Devices And Circuits Set 12

Electronics and Communication Engineering

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This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on Electronic Devices And Circuits Set 12

Q1 | Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.
  • true
  • false
Answer: true
Q2 | Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16 Ω.
  • 78.54%
  • 75%
  • 70.69%
  • 50%
Answer: 70.69%
Q3 | Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?
  • it needs two separate voltage sources.
  • there is crossover distortion in the output signal.
  • it does not provide exact switching of one transistor off and the other on at the zero- voltage condition.
  • all of the above
Answer: all of the above
Q4 | nMOS and pMOS transistors can be used for class B.
  • true
  • false
Answer: true
Q5 | Calculate the harmonic distortion component for an output signal having fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V.
  • 3.83%
  • 38.3%
  • 83.3%
  • 8.33%
Answer: 8.33%
Q6 | Which of the following instruments displays the harmonics of a distorted signal?
  • digital multimeter
  • spectrum analyzer
  • oscilloscope
  • wave analyzer
Answer: spectrum analyzer
Q7 | Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?
  • digital multimeter
  • spectrum analyzer
  • oscilloscope
  • wave analyzer
Answer: wave analyzer
Q8 | What is the maximum temperature rating for silicon power transistors?
  • 50º to 80º
  • 100º to 110º
  • 150º to 200º
  • 250º to 300º
Answer: 150º to 200º
Q9 | Which of the power amplifiers is not intended primarily for large- signal or power amplification?
  • class a
  • class b or ab
  • class c
  • class d
Answer: class c
Q10 | Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º.
  • 25 w
  • 30 w
  • 35 w
  • 40 w
Answer: 25 w
Q11 | A silicon power transistor is operated with a heat sink (θSA = 1.5ºC/W). The transistor, rated at 150 W (25ºC), has θJC = 0.5º C/W, and the mounting insulation has θCS = 0.6 ºC/W. What is the maximum power that can be dissipated if the ambient temperature is 50ºC and TJmax = 200 ºC?
  • 61.5 w
  • 60.0 w
  • 57.7 w
  • 55.5 w
Answer: 57.7 w
Q12 | Which of the following transistors has been quite popular as the driver device for class D amplification?
  • bjt
  • fet
  • ujt
  • mosfet
Answer: mosfet
Q13 | Kirchhoff's Voltage Law states that the total voltage around a closed loop must be
  • 0
  • ½
  • 1
  • 2
Answer: 0
Q14 | The algebraic sum of in a network of conductors meeting at a point is zero.
  • voltages
  • currents
  • resistances
  • inductances
Answer: currents
Q15 | The theorem is a way to determine the currents and voltages present in a circuit that has multiple sources.
  • norton
  • super position
  • thevenin
  • maximum power transfer
Answer: super position
Q16 | The concept on which Superposition theorem is based is
  • reciprocity
  • duality
  • non-linearity
  • linearity
Answer: linearity
Q17 | Kirchhoff’s current law is applicable to only
  • junction in a network
  • closed loops in a network
  • electric circuits
  • electronic circuits
Answer: junction in a network
Q18 | Kirchhoff's voltage law is related to
  • junction currents
  • battery emfs
  • ir drops
  • both b & c
Answer: both b & c
Q19 | Superposition theorem can be applied only to circuits having
  • resistive elements
  • passive elements
  • non-linear elements
  • linear bilateral elements
Answer: linear bilateral elements
Q20 | The concept on which superposition theorem is based on
  • reciprocity
  • duality
  • non-linearity
  • linearity
Answer: linearity
Q21 | Node analysis can be applied for
  • planar networks
  • non-planar networks
  • both a & b
  • electric networks
Answer: both a & b
Q22 | Mesh analysis is applicable for
  • planar networks
  • non-planar networks
  • both a & b
  • electric networks
Answer: planar networks
Q23 | The superposition theorem is applicable to
  • voltage only
  • current only
  • current and voltage
  • current, voltage and power
Answer: current, voltage and power
Q24 | Kirchhoff’s current law is applicable only to
  • junction in a network
  • closed loops in a network
  • electric circuits
  • electronic circuits
Answer: junction in a network
Q25 | Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with
  • mill man’s theorem
  • thevenin\s theorem
  • superposition theorem
  • maximum power transfer theorem
Answer: maximum power transfer theorem
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