100% free!
Sign up to unlock all our services and 1230 corrected and explained questions.


Question 26-1 : Radio theory...frequency is defined as the ? [ Candidate takeoff ]

Number of cycles occurring in one second in a radio wave expressed in hertz hz.

exemple 26 Number of cycles occurring in one second in a radio wave expressed in hertz (hz).

Question 26-2 : Radio theory...wavelength is defined as the ?

Physical distance travelled by a radio wave during one cycle of transmission.

exemple 30 Physical distance travelled by a radio wave during one cycle of transmission.

Question 26-3 : Radio theory...the mix of an electromagnetic wave with another is called ?

Interference.

exemple 34 Interference.

Question 26-4 : Radio theory...the phenomenon of a change in direction of an radio wave em wave occurring due to a change in its speed is called ?

Refraction.

exemple 38 Refraction.

Question 26-5 : Radio theory...the phenomenon by which wave energy bends around a permeable obstacle is called ?

Diffraction.

exemple 42 Diffraction.

Question 26-6 : Radio theory...vhf very high frequency waves appear in the frequency spectrum ?

30 mhz 300 mhz

exemple 46 30 mhz - 300 mhz

Question 26-7 : Radio theory...when the fading damping of a radio wave is so important that no signal can be received, this phenomenon is ?

Absorption.

exemple 50 Absorption.

Question 26-8 : Radio theory...to double the effective range of a radio transmission, the power output must be increased by a factor of ?

4.

exemple 54 4.

Question 26-9 : Radio theory...'fading' is ?

Interference between surface wave and sky wave.


Question 26-10 : Radio theory...radio waves travel at ?

The speed of light.


Question 26-11 : Radio theory...radio waves travel at a speed of ?

300000 km/s.


Question 26-12 : Radio theory...a radio signal looses strength as range from the transmitter increases, this is called ?

Attenuation.


Question 26-13 : Radio theory...an electromagnetic wave has two types of energy field ?

An e electrical field and h magnetic field.

exemple 74 An e electrical field and h magnetic field.

Question 26-14 : Radio theory...an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h. which statement is correct ?

The e and h fields are perpendicular to each other.

exemple 78 The (e) and (h) fields are perpendicular to each other.

Question 26-15 : Radio theory...an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h. their propagation speed is ?

The speed of light.

exemple 82 The speed of light.


~

Exclusive rights reserved. Reproduction prohibited under penalty of prosecution.

374 Free Training Exam Other source study: Uas drone training examen 27