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Microwave Engineering Mcqs

Q:

_________ and __________ contribute to the admittance of a transmission line in the lumped element representation.

A) conductance G, capacitor B) conductance, inductor
C) resistor, capacitor D) resistor, inductor
 
Answer & Explanation Answer: A) conductance G, capacitor

Explanation: Y=G+j?C. Hence, both conductance and capacitance contribute to the admittance of the transmission line.

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53
Q:

_________ and __________ contribute to the impedance of a transmission line in the lumped element representation.

A) resistor, inductor B) resistor, capacitor
C) capacitor, inductor D) transistor, capacitor
 
Answer & Explanation Answer: A) resistor, inductor

Explanation: Z=R+j?L. Hence, both resistor and inductor contribute to the impedance of the transmission line.

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75
Q:

To model a transmission line of infinitesimal length ?z, the lumped element that is not used is:

A) resistor B) inductor
C) capacitor D) transistor
 
Answer & Explanation Answer: D) transistor

Explanation: In the lumped element circuit model of a transmission line, we use only resistor, capacitor and inductor. Hence no transistor is used.

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92
Q:

For transverse electromagnetic wave propagation, we need a minimum of:

A) 1 conductor B) 2 conductors
C) 3 conductors D) bunch of conductors
 
Answer & Explanation Answer: B) 2 conductors

Explanation: With a single conductor, transverse electromagnetic wave propagation is not possible. Hence we need a minimum of 2 conductors.

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83
Q:

Transmission line is a _________ parameter network.

A) lumped B) distributed
C) active D) none of the mentioned
 
Answer & Explanation Answer: B) distributed

Explanation: Since no lumped elements like resistors, capacitors are used at microwave frequencies, only transmission lines are used. Hence they are called distributed parameter network.

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84
Q:

The key difference between circuit theory and transmission line theory is:

A) circuit elements B) voltage
C) current D) electrical size
 
Answer & Explanation Answer: D) electrical size

Explanation: Circuit theory assumes physical dimensions of the network smaller than electrical wavelength, while transmission lines may be considerable fraction of wavelength.

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