Objective questions on Microwave Devices, Antennas and Measurement

M.Sc Electronics Semester IV Exam Oct/Nov 2019 Shivaji University Kolhapur

_____ band is the IEEE microwave frequency band designation for frequency range 2.0 GHz to 4.0 GHz.
(a) L
(b) S
(c) C
(d) K

For microwave frequency generation GaAs diodes exhibit ______
(a) low field domain
(b) higher drift velocity
(c) higher conduction current density
(d) negative resistance

_____ of the parabolic reflector antenna is more than the horn antenna.
(a) Directivity
(b) Permissible phase angle
(c) Axial length
(d) Half of the flaring angle

Which microwave tube uses buncher and catcher cavities?
(a) Magnetron
(b) Klystronc
(c) Reflex klystron
(d) Travelling wave tube

GaAs is used in fabricating Gunn diode. Gunn diode is _____
(a) sliced device
(b) hollow device
(c) made of different type of semiconductor layers
(d) bulk devices

______ is a device that converts electrons to photons or vice-versa.
(a) Antenna
(b) Electron gun
(c) Photon amplifier
(d) Microwave tube

In transverse magnetic waves _____
(a) E is parallel to H
(b) H is parallel to wave direction
(c) H is transverse to wave direction
(d) E is transverse to H

When a load Z is matched to a line, the value of standing wave ratio is _____
(a) 0
(b) 1
(c) Infinity
(d) insufficient data to calculate SWR

The Gauss law employs _____ theorem for the calculation of charge density?
(a) Green theorem
(b) Stokes theorem
(c) Maxwell equation
(d) Gauss theorem

Smith chart is based on the polar plot of ______
(a) Reactance
(b) Voltage
(c) Current
(d) Voltage reflection co-efficient

The losses that occur in a transmission line is ______
(a) Conduction losses
(b) Di-electric loss
(c) Both a and b
(d) None of these

_____ band is the IEEE microwave freqency band designation for frequency range 8.0 GHz to 12.0 GHz.
(a) K
(b) S
(c) Ku
(d) X

Fading effect in microwave transmission occurs due to ____
(a) microwave frequency
(b) microwave beamwidth
(c) microwave directivity
(d) microwave transmission medium