NTC - Amateur Class A Examination. Below are elements 10

1.	Velocity of radio waves
Ans: 300 times 10 raised to 6

2.	Antennas having both horizontal and vertical components have this type of polarization
Ans: Circular polarization

3.	What is the current of an antenna if the power is 2000w and the antenna impedance is 20 Ohms
Ans: 10A

4.	What is the relationship between the current and the radiated power of the antenna?
Ans: P=I(squared)R

5.	What kind of radio wave is the same day or night
Ans: Ground wave

6.	The kind of antenna that needs no grounding
Ans: Hertz

7.	The frequency range of UHF
Ans: 300-3000MHz

8.	The most useable layer for long distance communication in hf propagation using ionosphere is
Ans: F2 layer

9.	In propagating space wave, the most practical frequency band to use is
Ans: VHF

10.	Ordinary broadcast quarter wave length antenna uses this kind of wave propagation
Ans: Ground wave
 
11.	What kind of modulation is mostly contained in static and lightning radio waves
Ans: AM

12.	The direction of the electrostatic field of an antenna
Ans: Polarization

13.	The dielectric effect of the air at the end of the antenna that effectively lengthens the antenna
Ans: end effect

14.	An antenna, complete in itself, and capable of self oscillation
Ans: Hertz

15.	The lowest radio frequency used in radio communication is
Ans: 10KHz

16.	What determines the surge impedance of two wire non resonant transmission line
Ans: impedance of the antenna

17.	The lowest portion of the atmosphere closest to the ground
Ans: F1 layer  

18.	For a given layer of the atmosphere, the highest frequency that will be returned to the earth by that layer, having been beamed straight up to it
Ans: reflected frequency 

19.	Variations in solar radiation and activities occur every year and follows cycle or pattern that repeats every
Ans: 11 years

20.	Troposcatter propagation uses frequencies in the
Ans: UHF

21.	Very low frequency waves are used in some types of services because
Ans: They are very reliable

22.	The ground waves eventually disappear as one moves away from the transmitter because of
Ans: maximum hop distance limit

23.	An electromagnetic wave is refracted when it
Ans: passes a medium of different density

24.	When microwave signals follow the curvature of the earth this is known as
Ans: Ducting

25.	If the wavelength of a radio transmission is 10m long, what is the operating frequency
Ans: 30MHz

26.        The bending of radio waves as they pass over a terrain feature such as hill or mountain
Ans: Diffraction 

27.	One of these may cause ionic disturbance characterized by rapid fluttering sound hence voice communications are poor
Ans: Sunspot activity

28.	The no signal area between the end of  the mobile groundwave signal and the reflected sky wave in hf propagation
Ans: skip zone

29.	The most ionized layer in the ionosphere
Ans: F2 layer

30.	The bending of radio waves as they pass obliquely from one medium to another in which the velocity of propagation is different
Ans: Refraction

31.	One way of minimizing fading is
Ans: use of diversity antenna

32.	If the wavelength of a radio transmission is 20 meters, what is the operating frequency
Ans: 15MHz

33.	An antenna that uses the ground to complete its resonant circuit
Ans: Marconi

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