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  • Question
  • 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.

  • Correct Answer
  • As frequency decreases input impedance increases. 


  • Field Effect Transistors (FET) problems


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    • 1. 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
    • 2. JFET terminal "legs" are connections to the drain, the gate, and the:

    • Options
    • A. channel
    • B. source
    • C. substrate
    • D. cathode
    • Discuss
    • 3. 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
    • 4. 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
    • 5. What is the most significant development in electronics since World War II?

    • Options
    • A. the development of color TV
    • B. the development of the diode
    • C. the development of the transistor
    • D. the development of the TRIAC
    • 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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