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  • Question

  • Which one of the following is not a negative resistance device?


  • Options
  • A. Gunn diode
  • B. Tunnel diode
  • C. Impatt diode
  • D. Varactor diode

  • Correct Answer
  • Varactor diode 

    Explanation
    Gunn diode, Tunnel diode and Impatt diodes are negative resistance devices.

    The limitation of solid state devices at high frequencies include those associated with transit time and junction capacitances.

    The devices used are : Transferred electron oscillators (Gunn diode), Avalanche diode oscillators (Impatt diode, Trapatt diode, Masters, Lasers, Tunnel diode, Varactor etc).

    More questions

    • 1. In which region of a CE bipolar transistor is collector current almost constant?

    • Options
    • A. Saturation region
    • B. Active region
    • C. Breakdown region
    • D. Both saturation and active region
      • Discuss
    • 2. The Q factor of a waveguide resonator is given by (?0 is resonant frequency, U is energy storage and WL is the power loss)

    • Options
    • A.
    • B.
    • C. Q = ?0UWL
    • D.
      • Discuss
    • 3. In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 ?. The value of ?R will be

    • Options
    • A. 2 ?
    • B. 3 ?
    • C. 4 ?
    • D. 1 ?
      • Discuss
    • 4. In a broadcast superheterodyne receiver

    • Options
    • A. the local oscillator operates below the signal frequency
    • B. local oscillator frequency is normally double the IF
    • C. RF amplifier normally works at kHz above the carrier frequency
    • D. mixer input must be tuned to the signal frequency
      • Discuss
    • 5. FM receivers using the standard 88 to 108 MHz band use IF of

    • Options
    • A. 8 MHz
    • B. 9.9 MHz
    • C. 10.7 MHz
    • D. 12.2 MHz
      • Discuss
    • 6. Which one of the following potential does not satisfy Laplace's equations?

    • Options
    • A. v = 10 xy
    • B. v = p cos ?
    • C.
    • D. v = f cos ? + 10
      • Discuss
    • 7. The rate at which information can be carried through a communication channel depends on

    • Options
    • A. carrier frequency
    • B. bandwidth
    • C. transmission loss
    • D. transmitted power
      • Discuss
    • 8. Generally the wall thickness of rectangular waveguide is

    • Options
    • A. about 1-5 mils
    • B. about 40-100 mils
    • C. about 0.1 to 0.5 mils
    • D. about 500 mils
      • Discuss
    • 9. It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude

    • Options
    • A. will increase
    • B. will decrease
    • C. will remain constant
    • D. will reduce to negligible value
      • Discuss
    • 10. Curie Weiss law is .

    • Options
    • A. True
    • B. False
      • Discuss

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