Microwave Engineering Quiz! Exam
(194).jpg "Microwave Engineering Quiz! Exam")
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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
Questions: 124 | Attempts: 21637 | Last updated: Jul 20, 2021
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