Questions 1
Questions
1.A radio wave is:
a.an energy wave comprising an electrical field in the same plane as a magnetic field
b.an electrical field alternating with a magnetic field
c.an energy wave where there is an electrical field perpendicular to a magnetic field
d.an energy field with an electrical component
2.The speed of radio waves is:
a.300 km per second
b.300 million metres per second
c.162 NM per second
d.162 million NM per second
3.The plane of polarization of an electromagnetic wave is:
a.the plane of the magnetic field
b.the plane of the electrical field
c.the plane of the electrical or magnetic field dependent on the plane of the aerial
d.none of the above
4.If the wavelength of a radio wave is 3.75 metres, the frequency is:
a.80 kHz
b.8 MHz
c.80 MHz
d.800 kHz
5.The wavelength corresponding to a frequency of 125 MHz is:
a.2.4 m
b.24 m
c.24 cm
d.24 mm
6.The frequency which corresponds to a wavelength of 6.98 cm is:
a.4298 GHz
b.4.298 GHz
c.429.8 GHz
d.42.98 GHz
7.The frequency band containing the frequency corresponding to 29.1 cm is:
a.HF
b.VHF
c.SHF
d.UHF
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8. |
To carry out a phase comparison between two electromagnetic waves: |
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both waves must have the same amplitude |
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both waves must have the same frequency |
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both waves must have the same amplitude and frequency |
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both waves must have the same phase |
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The phase of the reference wave is 110° as the phase of the variable wave is 315°. |
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What is the phase difference? |
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205° |
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025° |
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155° |
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335° |
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Determine the approximate phase difference between the reference wave and the |
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variable wave: |
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(The reference wave is the solid line and the variable wave is the dashed line) |
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a.045°
b.135°
c.225°
d.315°
11.The wavelength corresponding to a frequency of 15 625 MHz is:
a.1.92 m
b.19.2 m
c.1.92 cm
d.19.2 cm
12.Which frequency band is a wavelength of 1200 m?
a.UHF
b.LF
c.HF
d.MF
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