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CuriousTab

CuriousTab

Field Effect Transistors (FET) problems


  • 1. When testing an n-channel D-MOSFET, resistance G to D = ∞, resistance G to S = ∞, resistance D to SS = ∞ and 500 Ω, depending on the polarity of the ohmmeter, and resistance D to S = 500 Ω. What is wrong?

  • Options
  • A. short D to S
  • B. open G to D
  • C. open D to SS
  • D. nothing
  • Discuss
  • 2. When the JFET is no longer able to control the current, this point is called the:

  • Options
  • A. breakdown region
  • B. depletion region
  • C. saturation point
  • D. pinch-off region
  • Discuss
  • 3. JFET terminal "legs" are connections to the drain, the gate, and the:

  • Options
  • A. channel
  • B. source
  • C. substrate
  • D. cathode
  • Discuss
  • 4. With a JFET, a ratio of output current change against an input voltage change is called:

  • Options
  • A. transconductance
  • B. siemens
  • C. resistivity
  • D. gain
  • Discuss
  • 5. How will a D-MOSFET input impedance change with signal frequency?

  • Options
  • A. As frequency increases input impedance increases.
  • B. As frequency increases input impedance is constant.
  • C. As frequency decreases input impedance increases.
  • D. As frequency decreases input impedance is constant.
  • Discuss
  • 6. The common-source JFET amplifier has:

  • Options
  • A. a very high input impedance and a relatively low voltage gain
  • B. a high input impedance and a very high voltage gain
  • C. a high input impedance and a voltage gain less than 1
  • D. no voltage gain
  • Discuss
  • 7. With a 30-volt VDD, and an 8-kilohm drain resistor, what is the E-MOSFET Q point voltage, with ID = 3 mA?

  • Options
  • A. 6 V
  • B. 10 V
  • C. 24 V
  • D. 30 V
  • Discuss
  • 8. D-MOSFETs are sometimes used in series to construct a cascode high-frequency amplifier to overcome the loss of:

  • Options
  • A. low output impedance
  • B. capacitive reactance
  • C. high input impedance
  • D. inductive reactance
  • Discuss
  • 9. A MOSFET has how many terminals?

  • Options
  • A. 2 or 3
  • B. 3
  • C. 4
  • D. 3 or 4
  • Discuss
  • 10. The transconductance curve of a JFET is a graph of:

  • Options
  • A. IS versus VDS
  • B. IC versus VCE
  • C. ID versus VGS
  • D. ID × RDS
  • Discuss

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