Microwave Engineering Quiz | Microwave Engineering Objective Type Questions and Answers

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Questions
21 In microwave communication links, what causes intense fading in the 18GHz band ?
A Rain
B Fog
C Dust
D Snow

Answer: Rain
22 X-band frequencies are in which one of the following ranges?
A 8.0 to 12.0 GHz
B 12.4 to 16.4 GHz
C 3.5 to 5.5 GHz
D 5.5 to 8.0 GHz

Answer: 8.0 to 12.0 GHz
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23 Which of the following are microwave sources ?
A Magnetron
B TWTA
C klystron
D IMPATT

Answer: Magnetron
24 For a parabolic reflector of 5 meter diameter, the far field pattern measurement at 6 GHz should be carried out a distance of at least
A 2.0 km
B 1.5 km
C 1.0 km
D o.5 km

Answer: 1.0 km
25 Why is an attenuator used in a TWT ?
A To prevent oscillations
B To prevent saturation
C To help bunching
D To increase gain

Answer: To prevent oscillations
26 Which is the most common antenna to obtain a predetermined radiation pattern ?
A Helical antenna
B Corner reflector
C Array antenna
D Sectoral horn

Answer: Array antenna
27 In LOS-line of sight propagation systems, to take account of normal refraction, an effective earth radius factor k is used whose value is
A ½
B 4/3
C 4
D None of these

Answer: 4/3
28 The type of antenna to be used for producing circularly polarized beams is
A helical antenna
B paraboloid
C pyramidal horn
D log-periodic array

Answer: helical antenna
29 Which of the following can be used for amplification of microwave energy?
A Travelling wave tube
B Gunn diode
C Magnetron
D None of these

Answer: Travelling wave tube
30 The maximum theoretical output circuit efficiency of a double resonator klystron amplifier is
A 58%
B 85%
C 25%
D None of these

Answer: 58%
31 The pulse frequency is equal to
A Duty cycle/pulse width
B Pulse width x peak power/average power
C The reciprocal of the pulse repetition rate
D All of these

Answer: Duty cycle/pulse width
32 The noise produced in a microwave tube due to random nature of emission and electron flow is called
A Shot noise
B Shannon noise
C Johnson noise
D Partition noise

Answer: Shot noise
33 If the peak power of pulsed microwave system is 104 W and the average power is 800 W, the the duty cycle will be
A 8%
B 0.08%
C 80%
D 0.8%

Answer: 8%

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