Microwave Engineering Quiz! Exam

19 Questions | Total Attempts: 325

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Microwave Engineering Quiz! Exam

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Questions and Answers
  • 1. 
    A waveguide section in a microwave circuit acts as:
    • A. 

      LP filter

    • B. 

      All pass filter

    • C. 

      HP filter

    • D. 

      Band stop filter

  • 2. 
    Which of the following devices uses a slow wave structure?
    • A. 

      Klystron two cavity amplifier

    • B. 

      Klystron multicavity amplifier

    • C. 

      Travelling wave tube

    • D. 

      Reflex klystron oscillator

  • 3. 
    A line has Z0 = 300 ∠ 0° Ω. If ZL = 150 ∠ 0° Ω, reflection coefficient is
    • A. 

      0.5

    • B. 

      0.3333

    • C. 

      -0.5

    • D. 

      -0.3333

  • 4. 
    In a directional coupler:
    • A. 

      Isolation (dB) equals coupling plus directivity

    • B. 

      Coupling (dB) equals isolation plus directivity

    • C. 

      Directivity (dB) equals isolation plus coupling

    • D. 

      isolation (dB) equals (coupling) (directivity)

  • 5. 
    The reflection coefficient on a line is 0.2 ∠45°. The SWR is:
    • A. 

      0.8

    • B. 

      1.1

    • C. 

      1.2

    • D. 

      1.5

  • 6. 
    The velocity factor of a transmission line depends on:
    • A. 

      Temperature

    • B. 

      Skin effect

    • C. 

      Relative permittivity of dielectric

    • D. 

      None of the above

  • 7. 
    A frequency at which microwave ovens operate is:
    • A. 

      50 GHz

    • B. 

      8 GHz

    • C. 

      2.45 GHz

    • D. 

      3.5 GHz

  • 8. 
    Which of the following materials are generally preferred for waveguides?
    • A. 

      Cast iron and steel

    • B. 

      Nonmetallic solids including plastic

    • C. 

      High carbon steel and vanadium steel

    • D. 

      Brass and aluminium

  • 9. 
    In a magnetron why do the electrons travel in a cycloidal path?
    • A. 

      The cathode is positive

    • B. 

      Strong field is supplied by the permanent magnet

    • C. 

      The anode is negative

    • D. 

      The cavities are resonant

  • 10. 
    Which of the following is wrong for a magic used to tee?
    • A. 

      E and H arms are decoupled

    • B. 

      Coplanar arms are coupled

    • C. 

      All ports are perfectly matched

    • D. 

      A signal into coplanar arm splits equally between E and H arms

  • 11. 
    Which of the following bands that not comes under Microwave Band?
    • A. 

      C band

    • B. 

      X band

    • C. 

      Ku band

    • D. 

      F band

  • 12. 
    Which of the following is the main advantage of the microwave?
    • A. 

      Highly directive

    • B. 

      Moves at the speed of light

    • C. 

      Greater S/N ratio

    • D. 

      High penetration power

  • 13. 
    _______ is the best medium for handling large microwave power.
    • A. 

      Coaxial line

    • B. 

      Rectangular wave guide

    • C. 

      Strip line

    • D. 

      Copper wires

  • 14. 
    Which of the following is used for amplification of microwave energy?
    • A. 

      Reflex Klystron

    • B. 

      Megnetron

    • C. 

      Travelling wave tube

    • D. 

      Gunn Diode

  • 15. 
    Which of the following microwave tube amplifier uses an axial magnetic field & radial electric field?
    • A. 

      Reflex Klystron

    • B. 

      Coaxial Magnetron

    • C. 

      Travelling Wave Tube

    • D. 

      Crossed field Megnetron

  • 16. 
    The fabrication of microstrip line is done by?
    • A. 

      Etching

    • B. 

      Printed circuit Board technique

    • C. 

      Oxidation

    • D. 

      Cladding

  • 17. 
    For TE10 mode a rectangular wave guide has dimensions are 7 * 3.5 cm2. its cut off frequency is:
    • A. 

      2.14 GHz

    • B. 

      2.5 GHz

    • C. 

      1.5 GHz

    • D. 

      1.9 GHz

  • 18. 
    For the case of "No Propagation" the propagation constant must be:
    • A. 

      Real

    • B. 

      Imaginary

    • C. 

      Complex

    • D. 

      None of Above

  • 19. 
    The range of VSWR given as:
    • A. 

      0 to 1

    • B. 

      1 to 2

    • C. 

      1 to infinite

    • D. 

      -1 to 1

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