# Antenna Fundamental Parameters MCQ

## Antenna Fundamental Parameters MCQ

Antenna Fundamental Parameters MCQ, MCQ on Antenna Fundamental Parameters, Multiple Choice Questions on Antenna Fundamental Parameters, Antenna Fundamentals MCQ, Basic Antenna Parameters MCQ, Antenna MCQ, Engineering MCQ

objective questions on maxwell’s equations

Horn Antenna MCQ

### Objective Type Questions

Q.1. The horn antenna was developed by

• J.C. Bose (1900, India)
• Maxwell (1800, USA)
• J.D. Kraus (1789, UK)
• None of these

Answer: J.C. Bose (1900, India)

Q.2. Directivity of an antenna is determined by

• Gain
• Impedance pattern
• Efficiency

Q.3. Which is not a modern antenna?

• Dipole antenna
• Slot antenna
• Reflector antenna
• Lens antenna

Q.4. Power loss during power transformation through an antenna at distance R is proportional to (R–2), whereas power loss during power transformation through a Tx line at distance R is proportional to

• (R–2)
• (R2)
• e–αR
• (e–αR)2

Q.5. Directive antennas are useful in point to point communication, whereas omnidirectional antennas are useful in

• Microwave ovens
• As a feed-in reflector
• None of these

Q.6. Double polarized antennas enable the doubling of communication capacity by carrying separate information on orthogonal polarizations over the same physical link and at

• Different frequency
• Same frequency
• Both of these
• None of these

Q.7. A type of antenna acts as a funnel and directs the waves into the connecting waveguide.

This is the

• Horn antenna
• Slot antenna
• Reflector
• Lens antenna

Q.8. Electrically small antennas

• High directivity
• Low input impedance
• High input reactance
• Low radiation efficiency

Q.9. Resonant antennas

• Moderate gain
• Real input impedance
• Narrow bandwidth
• Finite reactance

• Wide Bandwidth
• Real input impedance
• Constant gain
• High reactance

Q.11. Quasi-fields vary with the distance as

• 1/r
• 1/r2
• r2
• None of these

Q.12. The distance at which far- and near-fields are equal is (λ/2π) is termed

• Equi-distance
• None of these

Q.13. Ohmic losses on an antenna are due to

• Antenna temperature
• Noise figure
• Noise temperature
• Noise sources

Q.14. The external noise picked up by the antenna is proportional to the antenna radiation resistance and it is larger than the noise arising from internal ohmic losses.

• True
• False
• Not known
• None of these

Q.15. The reactive part of input impedance (XA) of an antenna represents power stored in the

• Near-field
• Far-field
• Both near and Far-field
• Quasi-field

Q.16. The short dipole has a capacitive reactance, whereas an electrically small dipole has

• Inductive reactance
• Capacitive reactance
• Both inductive and capacitive reactance
• None of these

Q.17. Helix antenna provides complete

• Linear polarization
• Circular polarization
• Elliptical polarization
• Parallel polarization

Q.18. In general, the value of AR is +ve for RHCP and –ve for LHCP. It is measured in dB, which is converted by using

• 10 log AR
• 10 loge AR
• Both the above
• 20 log AR

Answer: 20 log AR

Q.19. An antenna has a directivity of 20 and radiation efficiency of 90%. What is its gain (dB)?

• 2.55 dB
• 12 dB
• 12.55 dB
• 90 dB