Microwave Engineering Quiz! Exam

19 Questions | By Dineshyadav_dy | Last updated: Mar 21, 2022 | Total Attempts: 368

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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