Quiz on Antenna
2
THAPAR UNIVERSITY PATIALA Antenna and Wave Propagation Theory (UEC601) Quiz #1 MM: 10 Time :10 min Note: i) All answers should be written in the boxes provided for the same else those will be treated as wrong answers ii) Any overwriting will be considered as wrong answer Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q1. If X ( F) = 0 the respective field is a) Solenoidal b) irrotational c)Scalar converted vector d) none of these Q2 For a lossless resonant antenna with input impedance of 75 ohms, is to be connected to a transmission line whose characteristic impedance is 50 ohms. What will be overall efficiency of antenna? a) 0.155dB b) 0.695dB c) –0.155dB d) – 0.695dB Q3. A crossed dipole antenna, with the two equal length arms fed with equal currents in a phase quadrature with respect to each other has……circular……………………polarization Q4. The principal surface ϕ = 270° is a plane that contains the ______ axis and the ______ axis from the rectangular coordinate system. Q5. To create radiation from an antenna there must be …………….current or…………charge. a) Direct current, direct charge b) Time varying current , accelerating charge c) Accelerating current, accelerating charge d) Both a and b. Q6. The ratio of maximum gain to maximum directivity will be
-
Upload
rkhanna1965 -
Category
Documents
-
view
8 -
download
1
description
Antenna Quiz
Transcript of Quiz on Antenna
THAPAR UNIVERSITYPATIALAAntenna and Wave Propagation Theory (UEC601)Quiz #1MM: 10Time :10 minNote: i) All answers should be written in the boxes provided for the same else those will be treated as wrong answersii) Any overwriting will be considered as wrong answerQ1
Q2Q3Q4Q5
Q6
Q7Q8Q9Q10
Q1. If X ( F) = 0 the respective field isa) Solenoidalb) irrotationalc)Scalar converted vectord) none of these
Q2For a lossless resonant antenna with input impedance of 75 ohms, is to be connected to a transmission line whose characteristic impedance is 50 ohms. What will be overall efficiency of antenna? a) 0.155dB b) 0.695dB c) 0.155dB d) 0.695dBQ3.A crossed dipole antenna, with the two equal length arms fed with equal currents in a phase quadrature with respect to each other hascircularpolarization
Q4.The principal surface = 270 is a plane that contains the ______ axis and the ______ axis from the rectangular coordinate system.Q5.To create radiation from an antenna there must be .current orcharge. a) Direct current, direct charge b) Time varying current , accelerating charge c) Accelerating current, accelerating charge d) Both a and b.
Q6. The ratio of maximum gain to maximum directivity will be (a) side lobe level (b) power density (c) Rr / (Rr+RL) (d) Beam area
Q8. If a radio receiver needs 1 nW/m2 of power density to function, how far away from a 1-W point source will it continue to work?
Q9.An antenna has a radiation patter in which major lobe has a normalized power level of -10dB and the first side lobe is at -25dB the Side lobe level of this antenna isa)-15dBb)15dBc)-35dBd)35dB
Q10.The radiation intensity of an isotropic radiator radiating power P is given by
Q11. An antenna that has more directivity hasbeamwidth.
Q12.Relation between power received to power transmitted between two antennas, in case of polarization matched antennas aligned for maximum directional radiation and reception, is given by .
