SET 1 ECT

Question 1

What is the name for the distance a radio wave travels during one complete cycle?

Answer 1

Wavelength

Question 2

How fast does a radio wave travel through free space?

Answer 2

At the speed of light

Question 3

How does the wavelength of a radio wave relate to its frequency?

Answer 3

The wavelength gets shorter as the frequency increases

Question 4

What is the formula for converting frequency to wavelength in meters?

Answer 4

Wavelength in meters equals 300 divided by frequency in megahertz

Question 5

What property of radio waves is often used to identify the different frequency bands?

Answer 5

The approximate wavelength

Question 6

What are the frequency limits of the UHF spectrum?

Answer 6

300 to 3000 MHz

Question 7

What are the frequency limits of the VHF

Answer 7

30 to 300 MHz

Question 8

What are the frequency limits of the VHF

Answer 8

30 to 300 MHz

Question 9

What are the frequency limits of the UHF

Answer 9

300 to 3000 MHz

Question 10

What frequency range is referred to as HF?

Answer 10

3 to 30 MHz

Question 11

What is the approximate velocity of a radio wave as it travels through free space?

Answer 11

300,000,000 meters per second

Question 12

How many milliamperes is 1.5 amperes?

Answer 12

1,500 milliamperes

Question 13

What is another way to specify a radio signal frequency of 1,500,000 hertz?

Answer 13

1500 kHz

Question 14

How many volts are equal to one kilovolt?

Answer 14

One thousand volts

Question 15

How many volts are equal to one microvolt?

Answer 15

One one-millionth of a volt

Question 16

Which of the following is equivalent to 500 milliwatts?

Answer 16

0.5 watts

Question 17

If an ammeter calibrated in amperes is used to measure a 3000- milliampere current, what reading would it show?

Answer 17

3 amperes

Question 18

a frequency readout calibrated in megahertz shows a reading of3.525 MHz, what would it show if it were calibrated in kilohertz?

Answer 18

3525 kHz

Question 19

What happens when the deviation of an FM transmitter is increased?

Answer 19

Its signal occupies more bandwidth

Question 20

How many microfarads are 1,000,000 picofarads?

Answer 20

1 microfarad

Question 21

What is the unit of frequency?

Answer 21

Hertz

Question 22

What is the abbreviation that refers to radio frequency signals of all types?

Answer 22

RF

Question 23

What determines the amount of deviation of an FM(as opposed to PM) signal?

Answer 23

The amplitude of the modulating signal

Question 24

Which of the following is a form of amplitude modulation?

Answer 24

Single sideband

Question 25

What type of modulation is most commonly used for VHF packet radio transmissions?

Answer 25

SSB  

Question 26

Which type of voice modulation is most often used for long- distance or weak signal contacts on the VHF and UHF bands?

Answer 26

SSB

Question 27

Which type of modulation is most commonly used for VHF and UHF voice repeaters?

Answer 27

FM

Question 28

Which of the following types of emission has the narrowest bandwidth?

Answer 28

CW()

Question 29

Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?

Answer 29

Upper sideband

Question 30

What is the primary advantage of single sideband over FM for voice transmissions?

Answer 30

SSB signals have narrower bandwidth ()

Question 31

What is the approximate bandwidth of a single sideband voice signal?

Answer 31

3kHz

Question 32

What is the approximate bandwidth of a VHF repeater FMphone signal?

Answer 32

Between 5 and 15 kHz

Question 33

What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?

Answer 33

About 6 MHz

Question 34

What is the approximate maximum bandwidth required to transmit a CW signal?

Answer 34

150Hz

Question 35

What type of amateur station simultaneously retransmits the signal of another amateur station on a different channel or channels?

Answer 35

Repeater station

Question 36

What could be used in place of a regular speaker to help you copy signals in a noisy area?

Answer 36

A set of headphones

Question 37

What term describes the number of times per second that an alternating current reverses direction?

Answer 37

Frequency

Question 38

Electrical current is measured in which of the following units?

Answer 38

Amperes

Question 39

Electrical power is measured in which of the following units?

Answer 39

watts

Question 40

Which term describes the rate at which electrical energy is used?

Answer 40

Power

Question 41

What is the name for the flow of electrons in an electric circuit?

Answer 41

Current

Question 42

What is the basic unit of electromotive force?

Answer 42

The volt

Question 43

What is the name for a current that flows only in one direction?

Answer 43

Direct current

Question 44

What is the formula used to calculate electrical power in a DC circuit?

Answer 44

Power (P) equals voltage (E) multiplied by current (I)

Question 45

What is the electrical term for the electromotive force (EMF) that causes electron flow?

Answer 45

Voltage

Question 46

How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?

Answer 46

30 watts

Question 47

Which of the following is a good electrical conductor?  

Answer 47

Copper

Question 48

Which of the following is a good electrical insulator?

Answer 48

Glass

Question 49

What is the name for a current that reverses direction on a regular basis?

Answer 49

Alternating current

Question 50

How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?

Answer 50

10 amperes  

Question 51

What formula is used to calculate current in a circuit?

Answer 51

Current (I) equals voltage (E) divided by resistance (R)