Microwave Engineering Quiz | Microwave Engineering Multiple Choice Questions and Answers

Questions
1 HEMT used in the microwave circuit is a
A Low Noise Amplifier
B Detector
C Source
D High Power Amplifier

Answer: Low Noise Amplifier
2 Klystron operates on the principle of
A Velocity Modulation
B Pulse Modulation
C Amplitude Modulation
D Frequency Modulation

Answer: Velocity Modulation
3 A cavity resonator can be represented by
A an LC circuit
B a lossy capacitor
C a lossy inductor
D an LCR circuit

Answer: an LC circuit
4 Ionospheric preparation is not possible for microwaves because
A Microwave will penetrate through the ionospheric layers
B There will be dispersion of microwave energy
C There will be an abrupt scattering in all directions
D Microwaves will be fully absorbed by the ionospheric layers

Answer: Microwave will penetrate through the ionospheric layers
5 fabrication of microstrip line is_____.
A cladding
B printed circuit technique
C oxidation
D None of these

Answer: printed circuit technique
6 ______ principle does Klystron operates
A Amplitude Modulation
B Pulse Modulation
C Frequency Modulation
D Velocity Modulation

Answer: Velocity Modulation
7 ____is the most common antenna to the predetermined radiation pattern.
A array antenna
B helical antenna
C sectrol horn
D None of these

Answer: array antenna
8 _____ devices use a helix?
A Klystron amplifier
B Klystron oscillator
C TWT
D None of these

Answer: TWT
9 ______ is the main advantage of a microwave.
A Highly directive
B High penetration power
C Moves at the speed of light
D None of these

Answer: Highly directive
10 Reflex klystron is used in_____.
A Oscillator
B mixer
C frequency multiplier
D None of these

Answer: Oscillator
11 One of the following is used for amplification of microwave energy.
A magnetron
B travelling wave tube
C gunn diode
D None of these

Answer: travelling wave tube
12 ______is depend on the velocity factor of a transmission line.
A relative permittivity of dielectric
B impedance
C temperature
D None of these

Answer: relative permittivity of dielectric
13 one of the bands that come under Microwave Band.
A E
B D
C C
D All the above

Answer: All the above
14 ______is not a microwave tube.
A cathode_ray tube
B magnetron
C travelling_wave tube
D None of these

Answer: cathode_ray tube
15 A Gunn diode is a negative resistance device, which is used as source of microwaves. What is the number of p-n junctions ?
A 0
B 3
C 2
D 1

Answer: 0
16 Which is the dominant mode in rectangular waveguides ?
A TE10
B TM11
C TM01
D TE11

Answer: TE10
17 The main disadvantage of using coaxial cable for microwave signals is its
A High attenuation
B High sensitivity
C Low distortion
D Low selectivity

Answer: High attenuation
18 Which of the following is a circularly polarized antenna ?
A Helical
B Pyramidal
C Horn
D Dipole

Answer: Helical
19 Which one of the following is a transferred electron device ?
A Gunn DIODE
B TRAPATT diode
C IMPATT diode
D BARITT diode

Answer: Gunn DIODE
20 A amplifier has a power gain of 200. What is its gain in dB? (log10 2 = 0.30)
A 23 dB
B 20 dB
C 14 dB
D 17 dB

Answer: 23 dB
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