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This set of Radiation and Microwave Techniques Multiple Choice Questions & Answers (MCQs) focuses on Radiation And Microwave Techniques Set 6
Q1 | A measure of the mismatched between line and load impedance is called as
- reflection coefficient
- standing wave ratio
- loss
- standing waves
Q2 | Power density is basically termed as power per unit are
- reflected
- radiated
- diffracted
- refracted
Q3 | Parabolic and lens antennas are extensively used for
- short waves
- micro waves
- medium frequency waves
- all of the above
Q4 | The television receiver antennas are usually
- parabolic dish type
- helical antennas
- dipoles
- none of the above
Q5 | Lens antennas used for microwaves are usually made of
- paraboloid surfaces
- polystyrene
- dielectric media having large refractive index
- glass of low refractive index
Q6 | One of the following antenna types is best excited from a waveguide
- horn antenna
- helical antenna
- biconical antenna
- log periodic antenna
Q7 | The parabolic and lens antennas are used extensively at
- sw
- mw
- microwaves
- al of the above
Q8 | Micro strip can be fabricated using:
- photolithographic process
- electrochemical process
- mechanical methods
- none of the above
Q9 | slotted antenna is used for
- uhf
- vhf
- none of the above
- both uhf and vhf
Q10 | The radar in which both transmission and reception is done using the sameantenna are called:
- monostatic
- bistatic
- dipole radar
- monopole radar
Q11 | __________ system obtains information about a target by transmitting a signaland receiving the echo from the target.
- radar
- sonar
- radiometer
- none of the above
Q12 | The solid area through which all the power radiated by the antenna is:
- beam area
- effective area
- aperture area
- beam efficiency
Q13 | Which one of the following device behaviour is governed by bulk effect?
- impatt diode
- gunn diode
- tunnel diode
- pin diode
Q14 | In a MTI radar, the quartz delay line is used to
- match the phase of coho and output oscillator
- match the phase of coho and stalo
- match the signal with echo
- subtract a complete scan from previous scan
Q15 | Voltage reflection coefficient can be defined as:
- ratio of amplitude of reflected voltage wave to the transmitted voltage wave
- ratio of amplitude of reflected voltage to the incident voltage wave
- ratio of load impedance to the characteristic impedance of the transmission line
- none of the mentioned
Q16 | Flow of power in transmission line takes place through:
- electric field and magnetic field
- voltage and current
- voltage
- electric field
Q17 | If a transmission line of a characteristics impedance 50 Ω is terminated with a loadimpedance of 100 Ω, then the reflection co efficient is:
- 0.3334
- 0.6667
- 1.6
- 1.333
Q18 | If a transmission line of characteristic impedance 50 Ω is to be matched to a load of100Ω, then the characteristic impedance of the ƛ/4 transmission line to be used is:
- 75 Ω
- 50 Ω
- 100 Ω
- 70.71 Ω
Q19 | If there is no standing wave on a transmission line, then the value of SWR is:
- 0
- 1
- infinity
- insufficient data
Q20 | If a transmission line of characteristic impedance 50 Ω is terminated with a loadimpedance of 150 Ω , then VSWR is:
- 0.75
- 0.5
- 2
- none of the mentioned
Q21 | Smith chart is based on the polar plot of:
- reactance
- voltage
- current
- voltage reflection co-efficient
Q22 | To get an admittance chart from an impedance chart:
- smith chart has to be rotated by 90⁰
- smith chart has to be rotated by 180⁰
- admittance chart cannot be obtained from the impedance chart anyway.
- none of the mentioned
Q23 | Propagation constant γ is given by:
- α+jβ
- α-jβ
- α/jβ
- α.jβ
Q24 | The key difference between circuit theory and transmission line theory is:
- circuit elements
- voltage
- current
- electrical size
Q25 | Transmission line is a _________ parameter network.
- lumped
- distributed
- active
- none of the mentioned