Microwave Engineering Exam Prep
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Microwave Engineering Exam Prep
English 17 leveled MCQs Free
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10 marks Long answer
Using velocity and current modulation, explain the operation of a two-cavity Klystron Amplifier.
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Operation is explained through modulation principles affecting electron flow.
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9 marks Long answer
Explain the process of bunching in a cavity magnetron.
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Bunching process is explained through electron dynamics in the magnetron.
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8 marks Long answer
Starting from Maxwell equations derive the field expressions for TE waves in rectangular waveguide.
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TE wave fields are derived from the solution of Maxwell's equations.
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8 marks Long answer
Describe in detail about Gunn Oscillation Modes.
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Gunn Oscillation Modes are described through their operational characteristics.
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8 marks Long answer
Draw the bench setup for measuring low VSWR and explain its operation.
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Bench setup is drawn and explained based on VSWR measurement principles.
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6 marks Long answer
Derive the expressions for the fields in rectangular waveguide in case of Transverse Magnetic (TM) wave.
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Expressions for TM fields are derived from Maxwell's equations.
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6 marks Long answer
Determine the cutoff wavelength and wave impedance in case of rectangular waveguide with dimensions of 5 x 2 cm propagating TM$_{11}$ mode at f = 9GHz.
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Cutoff wavelength and wave impedance are calculated using waveguide dimensions.
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6 marks Long answer
Derive the frequency of rectangular cavity resonator.
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Frequency is derived using the dimensions of the cavity and wave properties.
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6 marks Long answer
For the dominant mode of operation in an air-filled circular waveguide of inner diameter 4 cm. Find: (i) Cut off wavelength. (ii) Guided wave length. (iii) Cut off frequency.
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Cutoff parameters are calculated based on waveguide dimensions.
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6 marks Long answer
Derive S-Matrix for H - Plane Tee junction.
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S-Matrix is derived based on the junction's properties and wave interactions.
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6 marks Long answer
A 100 W power source is connected to the input of a directional coupler with coupling factor = 20 dB, Directivity=60 dB and an insertion loss of 0.8 dB. Find output power at the through, coupled and isolated ports. Assume all ports to be matched.
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Output powers are calculated using the given parameters of the coupler.
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6 marks Long answer
Derive S-Matrix for magic Tee junction.
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S-Matrix is derived based on the properties of the magic Tee junction.
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6 marks Long answer
An isolator has an insertion loss of 0.5 dB and an isolation of 30dB. Determine the scattering matrix of the isolator if the isolated ports are perfectly matched to the junction.
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Scattering matrix is determined using the isolator's insertion loss and isolation.
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4 marks Medium answer
Sketch the field patterns for TE and TM dominant modes in a rectangular waveguide.
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Field patterns for TE and TM modes are sketched as per their characteristics.
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4 marks Medium answer
Determine the conductivity of n-type GaAs Gunn diode if electron density $n = 10^{16} cm^{-3}$, electron density at lower valley $n_l = 10^{10} cm^{-3}$, electron density at upper valley $n_u = 10^8 cm^{-3}$, mobility in lower valley $\mu_l = 8000 cm^2/V-s$, mobility in upper valley $\mu_u = 180 cm^2/V-s$ at temperature $T = 300 K$.
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Conductivity is calculated using the given electron densities and mobilities.
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4 marks Medium answer
Determine the attenuation of the given attenuator, if the power meter reads 10 mW with attenuator and 26 mW after removing it.
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Attenuation is calculated based on the power readings before and after the attenuator.
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2 marks Short answer
Discuss about classification of microwave tubes.
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Microwave tubes are classified based on their operational principles and designs.
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