Es&t017
This QUIZ is made or by product of my continuous research & study about Electronics Engineering to help the Electronics Engineer/Technician Aspirants in passing the Board Examinations.
- 1.The real part of an antenna's input impedance is due to:
- A.
The radiated signal
- B.
The reflected signal
- C.
The SWR
- D.
All of the above
- 2.A half-wave dipole is sometimes called:
- A.
A Marconi antenna
- B.
A Hertz antenna
- C.
A Yagi antenna
- D.
None of the above
- 3.The end-to-end length of a half-wave dipole antenna is actually:
- A.
One wavelength
- B.
One half-wavelength
- C.
Slightly longer than a half-wavelength
- D.
Slightly shorter than a half-wavelength
- 4.The radiation of energy from an antenna can be seen in the:
- A.
Standing wave pattern around the antenna
- B.
SWR along the feed cable
- C.
Radiation resistance of the antenna
- D.
Power loss of the antenna
- 5.Measured on the ground, the field strength of a horizontally polarized half-wave dipole antenna is strongest:
- A.
In one direction
- B.
In two directions
- C.
In all directions
- D.
Depends on the number of elements
- 6.The ability of an antenna to radiate more energy in one direction than in other directions is called:
- A.
Directivity
- B.
Selectivity
- C.
Active antenna
- D.
Resonance
- 7.The front-to-back ratio of a half-wave dipole antenna is:
- A.
0 dB
- B.
3 dB
- C.
10 dB
- D.
Infinite
- 8.An antenna's beamwidth is measured:
- A.
From +90° to –90°
- B.
From front to back
- C.
Between half-power points
- D.
Between the minor side-lobes
- 9.ERP stands for:
- A.
Equivalent Radiation Pattern
- B.
Effective Radiation Pattern
- C.
Equivalent Radiated Power
- D.
Effective Radiated Power
- 10."Ground Effects" refers to the effects on an antenna's radiation pattern caused by:
- A.
Radio signals reflecting off the ground
- B.
Buildings and other structures on the ground
- C.
Fading
- D.
Faulty connection of the feed cable ground
- 11.A 1-MHz monopole antenna must be:
- A.
Mounted vertically
- B.
Mounted horizontally
- C.
At least one half-wavelength long
- D.
At least one wavelength long
- 12.The typical antenna in an AM radio is a:
- A.
Dipole
- B.
Folded dipole
- C.
Ferrite "loop-stick"
- D.
None of the above
- 13.The polarization of plane waves received from a satellite is changed by:
- A.
Gamma rays
- B.
Faraday Rotation
- C.
Helical rotation
- D.
The distance traveled
- 14.A nonresonant antenna:
- A.
Will not transmit
- B.
Will not receive
- C.
Will cause SWR on the feed cable
- D.
All of the above
- 15.At resonance, the input impedance to a lossless antenna should be:
- A.
Resistive
- B.
Inductive
- C.
Capacitive
- D.
Infinite
- 16.An antenna can be matched to a feed line using:
- A.
A shorted stub
- B.
A loading coil
- C.
An LC network
- D.
All of the above
- 17.As the length of a "long-wire" antenna is increased:
- A.
The number of lobes increases
- B.
The number of nodes decreases
- C.
Efficiency decreases
- D.
None of the above
- 18.Arrays can be:
- A.
Phased
- B.
Driven
- C.
Parasitic
- D.
All of the above
- 19.An array with one driven element, a reflector, and one or more directors is called a:
- A.
Marconi
- B.
Yagi
- C.
Log-Periodic Dipole
- D.
Stacked array
- 20.LPDA stands for:
- A.
Low-Power Dipole Array
- B.
Low-Power Directed Array
- C.
Log-Periodic Dipole Array
- D.
Log Power Dipole Array
- 21.The radiated beam from a parabolic "dish" transmitting antenna is:
- A.
Collimated
- B.
Phased
- C.
Dispersed
- D.
None of the above
- 22.The energy picked up by a parabolic antenna is concentrated at the:
- A.
Center
- B.
Edges
- C.
Focus
- D.
Horn
- 23.Antennas are often tested in:
- A.
An echo chamber
- B.
An anechoic chamber
- C.
A vacuum chamber
- D.
An RF reflective chamber
- 24.Field strength at a distance from an antenna is measured with:
- A.
A slotted line
- B.
A dipole
- C.
An EIRP meter
- D.
A field-strength meter
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