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Test: Waveguide Current & Excitation


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10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Waveguide Current & Excitation

Test: Waveguide Current & Excitation for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Waveguide Current & Excitation questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Waveguide Current & Excitation MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Waveguide Current & Excitation below.
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Test: Waveguide Current & Excitation - Question 1

The source voltage of a 75ohm transmission line is given by 150V. Find the load current.

Detailed Solution for Test: Waveguide Current & Excitation - Question 1

Answer: b
Explanation: The load current is given by IL = VS/Z0. On substituting for VS = 150 and Z0 = 75, we get IL = 150/75= 2A.

Test: Waveguide Current & Excitation - Question 2

The guided terminations are used to

Detailed Solution for Test: Waveguide Current & Excitation - Question 2

Answer: c
Explanation: The guided termination refers to the waveguide shorted by conducting plates. This is done in order to eliminate the reflection losses.

Test: Waveguide Current & Excitation - Question 3

Which type of wave does the resonant cavity produce?

Detailed Solution for Test: Waveguide Current & Excitation - Question 3

Answer: a
Explanation: Resonant cavity is the waveguide shorted by a conducting plate. This is to reduce the reflection losses. Such arrangement leads to standing waves.

Test: Waveguide Current & Excitation - Question 4

Which of the following parameter cannot be calculated from the standing waves?

Detailed Solution for Test: Waveguide Current & Excitation - Question 4

Answer: d
Explanation: The peak voltage and current can be directly measured from the standing waves. The standing wave ratio, reflection coefficient and the transmission coefficient can also be calculated from it. Only the attenuation constant cannot be calculated directly.

Test: Waveguide Current & Excitation - Question 5

For efficient transmission, the characteristic impedance of the transmission line has to be

Detailed Solution for Test: Waveguide Current & Excitation - Question 5

Answer: c
Explanation: Generally, for ideal transmission lines, the characteristic impedance should be either 50 ohm or 75 ohm.

Test: Waveguide Current & Excitation - Question 6

The cavity resonators are used in the klystron amplifiers for

Detailed Solution for Test: Waveguide Current & Excitation - Question 6

Answer: b
Explanation: The cavity resonators are employed in the klystron amplifiers for amplifying the microwave signals.

Test: Waveguide Current & Excitation - Question 7

The cavity resonators used in the reflex klystron oscillators are for

Detailed Solution for Test: Waveguide Current & Excitation - Question 7

Answer: b
Explanation: Oscillators are devices that generate signal waveforms. The reflex klystron oscillator is used to generate microwave signals.

Test: Waveguide Current & Excitation - Question 8

One of the applications of the cavity resonators is duplexer in RADAR systems. State true/false.

Detailed Solution for Test: Waveguide Current & Excitation - Question 8

Answer: a
Explanation: Cavity resonator is used in duplexers of RADAR systems, as resonant cavity in transmit receive (TR) tubes and antitransmit receive (ART) tubes.

Test: Waveguide Current & Excitation - Question 9

Cavity wave meters are used to measure which parameter of the wave?

Detailed Solution for Test: Waveguide Current & Excitation - Question 9

Answer: d
Explanation: Cavity resonators are used in cavity wave meters for the measurement of frequency of the microwave signals.

Test: Waveguide Current & Excitation - Question 10

The waveguides are terminated by the procedure of

Detailed Solution for Test: Waveguide Current & Excitation - Question 10

Answer: c
Explanation: A waveguide is terminated by concept of tapered or exponential line and uses a dielectric having considerable conductivity to provide power absorbing properties. This will eliminate the reflection losses.

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