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ECE :: Microwave Engineering

  1. PIN diode is suitable for use as a _____
  2. A.
    Microwave switch
    B.
    Microwave mixed diode
    C.
    Microwave detector
    D.
    None of these

  3. Which of the following is the semiconductor diode which can be used in switching circuits at microwave range
  4. A.
    PIN diode
    B.
    Tunnel diode
    C.
    Varactor diode
    D.
    Gunn diode

  5. Microwave antenna aperture efficiency depends on _________
  6. A.
    Feed pattern
    B.
    Antenna aperture
    C.
    Surface losses
    D.
    low side lobe level

  7. _________ noise is produced in a microwave tube due to random nature of emission & electron flow
  8. A.
    Partition noise
    B.
    Shot noise
    C.
    Johnson noise
    D.
    Shannon noise

  9. Which of the following is the one of the reason why vacuum tubes eventually fail at microwave frequencies
  10. A.
    Noise figure increases
    B.
    Transit time becomes too short
    C.
    Shunt capacitive reactances becomes too large
    D.
    Series inductance reactances becomes too small

  11. A Magic “ Tee is nothing but
  12. A.
    Modification of E- Plane tee
    B.
    Modification of H- Plane tee
    C.
    Combination of E- plane & H- plane
    D.
    Two E- plane tees connected in parallel

  13. Which of the following is used for amplification of microwave energy
  14. A.
    Travelling wave tube
    B.
    Magnetron
    C.
    Reflex klystron
    D.
    Gunn diode

  15. In Microwave power measurements using bolometer, the principle of working is the variation of
  16. A.
    Inductance with absorption of power
    B.
    Resistance with absorption of power
    C.
    Capacitance with absorption of power
    D.
    Cavity dimensions with heat generated by the power

  17. In π mode operation of magnetron, the spokes due to phase focusing effect rotate at an angular velocity corresponding to ________
  18. A.
    One pole / cycle
    B.
    Two poles / cycle
    C.
    Four poles / cycle
    D.
    Six poles / cycle

  19. Travelling wave parametric amplifiers are used to _______
  20. A.
    Provide a greater gain
    B.
    Reduce the number of Varactor diodes required
    C.
    Avoid the need for cooling
    D.
    Provide a greater bandwidth