Electronic Devices And Circuits Set 1

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 1

Q1 | A transistor has how many pn junctions?
  • 1
  • 2
  • 3
  • 4
Answer: 2
Q2 | In an npn transistor, the majority carriers in the emitter are
  • free electrons
  • holes
  • neither
  • both
Answer: free electrons
Q3 | The barrier potential across each silicon depletion layer is
  • 0v
  • 0.3v
  • 0.7v
  • 1v
Answer: 0.7v
Q4 | The base of an npn transistor is thin and
  • heavily doped
  • lightly doped
  • metallic
  • doped by a pentavalent material
Answer: lightly doped
Q5 | The emitter of a transistor is generally doped the heaviest because it
  • has to dissipate maximum power
  • has to supply the charge carriers
  • is the first region of the transistor
  • must possess low resistance
Answer: has to dissipate maximum power
Q6 | When a transistor is fully switched ON, it is said to be
  • shorted
  • saturated
  • open
  • cut-off
Answer: saturated
Q7 | A FET consists of a
  • source
  • drain
  • gate
  • all the above
Answer: all the above
Q8 | The extremely high input impedance of a MOSFET is primarily due to the
  • absence of its channel
  • negative gate- source voltage
  • depletion of current carriers
  • extremely small leakage current of its gate capacitor
Answer: extremely small leakage current of its gate capacitor
Q9 | When a transistor is used as a switch, it is stable in which two distinct regions?
  • saturation and active
  • active and cutoff
  • saturation and cutoff
  • none of the above
Answer: saturation and cutoff
Q10 | The term BJT is short for
  • base junction transistor
  • binary junction transistor
  • both junction transistor
  • bipolar junction transistor
Answer: bipolar junction transistor
Q11 | What are the two types of bipolar junction transistors?
  • npn and pnp
  • pnn and nnp
  • ppn and nnp
  • pts and stp
Answer: npn and pnp
Q12 | The magnitude of dark current in a phototransistor usually falls in what range?
  • ma
  • ma
  • na
  • pa
Answer: na
Q13 | Junction Field Effect Transistors (JFET) contain how many diodes?
  • 4
  • 3
  • 2
  • 1
Answer: 1
Q14 | When not in use, MOSFET pins are kept at the same potential through the use of:
  • shipping foil
  • nonconductive foam
  • conductive foam
  • a wrist strap
Answer: conductive foam
Q15 | A MOSFET has how many terminals?
  • 2 or 3
  • 3
  • 4
  • 3 or 4
Answer: 3 or 4
Q16 | A very simple bias for a D-MOSFET is called:
  • self biasing
  • gate biasing
  • zero biasing
  • voltage- divider biasing
Answer: zero biasing
Q17 | Hybrid means
  • mixed
  • single
  • biunique
  • none of the above
Answer: mixed
Q18 | There are h- parameters of a transistor.
  • two
  • four
  • three
  • none of the above
Answer: four
Q19 | The h- parameter approach gives correct results for
  • large signals only
  • small signals only
  • both small and large signals
  • none of the above
Answer: small signals only
Q20 | If the operating point changes, the h-parameters of transistor
  • also change
  • do not change
  • may or may not change
  • none of above
Answer: also change
Q21 | The dc load line on a family of collector characteristic curves of a transistor shows the
  • saturation region.
  • cutoff region.
  • active region.
  • all of the above
Answer: all of the above
Q22 | When a transistor is used as a switch, it is stable in which two distinct regions?
  • saturation and active
  • active and cutoff
  • saturation and cutoff
  • none of the above
Answer: saturation and cutoff
Q23 | The value of βDC
  • is fixed for any particular transistor.
  • varies with temperature.
  • varies with ic.
  • varies with temperature and ic.
Answer: varies with temperature and ic.
Q24 | A BJT has an IB of 50 µA and a βDC of 75; IC is:
  • 375 ma
  • 37.5 ma
  • 3.75 ma
  • 0.375 ma
Answer: 3.75 ma
Q25 | A certain transistor has IC = 15 mA and IB = 167 µA; βDC is:
  • 15
  • 167
  • 0.011
  • 90
Answer: 90
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