US Amateur Radio - Technician 2010 Practice Test

Anonymous User

US Amateur Radio - Technician 2010 Practice Test

Logging in (or registering) will help the system to select questions that you need to focus on.

1. - T0A04

What is the purpose of a fuse in an electrical circuit?

Select	Answer
A	To limit current to prevent shocks
B	All of these choices are correct
C	To prevent power supply ripple from damaging a circuit
D	To interrupt power in case of overload

2. - T0B08

What is considered to be a proper grounding method for a tower?

Select	Answer
A	A connection between the tower base and a cold water pipe
B	Separate eight-foot long ground rods for each tower leg, bonded to the tower and each other
C	A ferrite-core RF choke connected between the tower and ground
D	A single four-foot ground rod, driven into the ground no more than 12 inches from the base

3. - T0C02

Which of the following frequencies has the lowest Maximum Permissible Exposure limit?

Select	Answer
A	1296 MHz
B	50 MHz
C	3.5 MHz
D	440 MHz

4. - T1A11

Which of the following stations transmits signals over the air from a remote receive site to a repeater for retransmission?

Select	Answer
A	Beacon station
B	Auxiliary station
C	Relay station
D	Message forwarding station

5. - T1B07

What amateur band are you using if you are transmitting on 223.50 MHz?

Select	Answer
A	10 meter band
B	1.25 meter band
C	15 meter band
D	2 meter band

6. - T1C03

What types of international communications are permitted by an FCC-licensed amateur station?

Select	Answer
A	Only communications incidental to contest exchanges, all other communications are prohibited
B	Any communications that would be permitted on an international broadcast station
C	Communications incidental to the purposes of the amateur service and remarks of a personal character
D	Communications incidental to conducting business or remarks of a personal nature

7. - T1D07

When is an amateur station authorized to automatically retransmit the radio signals of other amateur stations?

Select	Answer
A	When the signals are from an Earth, repeater, or space station
B	When the signals are from a beacon, repeater, or space station
C	When the signals are from an auxiliary, repeater, or space station
D	When the signals are from an auxiliary, beacon, or Earth station

8. - T1E08

What type of control is being used for a repeater when the control operator is not present at a control point?

Select	Answer
A	Local control
B	Automatic control
C	Unattended
D	Remote control

9. - T1F03

When is an amateur station required to transmit its assigned call sign?

Select	Answer
A	At least once during each transmission
B	At least every 15 minutes during and at the end of a contact
C	At least every 10 minutes during and at the end of a contact
D	At the beginning of each contact, and every 10 minutes thereafter

10. - T2A02

What is the national calling frequency for FM simplex operations in the 70 cm band?

Select	Answer
A	145.000 MHz
B	432.100 MHz
C	446.000 MHz
D	146.520 MHz

11. - T2B05

What determines the amount of deviation of an FM signal?

Select	Answer
A	The relative phase of the modulating signal and the carrier
B	The amplitude of the modulating signal
C	The frequency of the modulating signal
D	Both the frequency and amplitude of the modulating signal

12. - T2C09

When may an amateur station use any means of radio communications at its disposal for essential communications in connection with immediate safety of human life and protection of property?

Select	Answer
A	Only when RACES authorizes it by declaring an emergency
B	When normal communications systems are not available
C	Only when authorized by the local MARS program director
D	Only when FEMA authorizes it by declaring an emergency

13. - T3A04

What can happen if the antennas at opposite ends of a VHF or UHF line of sight radio link are not using the same polarization?

Select	Answer
A	Signals have an echo effect on voices
B	The modulation sidebands might become inverted
C	Nothing significant will happen
D	Signals could be significantly weaker

14. - T3B06

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

Select	Answer
A	Wavelength in meters equals 300 divided by frequency in megahertz
B	Wavelength in meters equals frequency in hertz multiplied by 300
C	Wavelength in meters equals frequency in hertz divided by 300
D	Wavelength in meters equals frequency in megahertz divided by 300

15. - T3C06

What mode is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?

Select	Answer
A	Faraday rotation
B	Tropospheric scatter
C	D layer refraction
D	F2 layer refraction

16. - T4A07

How is the computer’s sound card used when conducting digital communications using a computer?

Select	Answer
A	The sound card provides audio to the microphone input and converts received audio to digital form
B	The sound card records the audio frequency for video display
C	All of these choices are correct
D	The sound card communicates between the computer CPU and the video display

17. - T4B08

What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?

Select	Answer
A	Increases the number of frequencies that can be stored in memory
B	Increases the amount of offset between receive and transmit frequencies
C	Permits monitoring several modes at once
D	Permits noise or interference reduction by selecting a bandwidth matching the mode

18. - T5A05

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

Select	Answer
A	Ampere-hours
B	Inductance
C	Voltage
D	Capacitance

19. - T5B10

What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?

Select	Answer
A	9 dB
B	3 dB
C	1 dB
D	6 dB

20. - T5C11

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

Select	Answer
A	12 amperes
B	10 amperes
C	132 amperes
D	0.1 amperes

21. - T5D12

What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?

Select	Answer
A	20 volts
B	12 volts
C	0.2 volts
D	8 volts

22. - T6A07

What electrical component is usually composed of a coil of wire?

Select	Answer
A	Capacitor
B	Inductor
C	Switch
D	Diode

23. - T6B03

Which of these components can be used as an electronic switch or amplifier?

Select	Answer
A	Voltmeter
B	Transistor
C	Potentiometer
D	Oscillator

24. - T6C04

What is component 3 in figure T1?

Select	Answer
A	Ground symbol
B	Lamp
C	Transistor
D	Resistor

25. - T6D01

Which of the following devices or circuits changes an alternating current into a varying direct current signal?

Select	Answer
A	Reflector
B	Rectifier
C	Transformer
D	Amplifier

26. - T7A09

Which of the following devices is most useful for VHF weak-signal communication?

Select	Answer
A	A quarter-wave vertical antenna
B	An omni-directional antenna
C	A mobile VHF FM transceiver
D	A multi-mode VHF transceiver

27. - T7B01

What can you do if you are told your FM handheld or mobile transceiver is over deviating?

Select	Answer
A	Talk louder into the microphone
B	Let the transceiver cool off
C	Change to a higher power level
D	Talk farther away from the microphone

28. - T7C03

What, in general terms, is standing wave ratio (SWR)?

Select	Answer
A	A measure of how well a load is matched to a transmission line
B	The ratio of high to low impedance in a feedline
C	The transmitter efficiency ratio
D	An indication of the quality of your station’s ground connection

29. - T7D06

Which of the following might damage a multimeter?

Select	Answer
A	Not allowing it to warm up properly
B	Leaving the meter in the milliamps position overnight
C	Measuring a voltage too small for the chosen scale
D	Attempting to measure voltage when using the resistance setting

30. - T8A07

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

Select	Answer
A	SSB signals are easier to tune
B	SSB signals have narrower bandwidth
C	SSB signals are less susceptible to interference
D	All of these choices are correct

31. - T8B10

What do the initials LEO tell you about an amateur satellite?

Select	Answer
A	The satellite battery is in Low Energy Operation mode
B	The satellite is performing a Lunar Ejection Orbit maneuver
C	The satellite is in a Low Earth Orbit
D	The satellite uses Light Emitting Optics

32. - T8C04

Which of the following is good procedure when contacting another station in a radio contest?

Select	Answer
A	Send only the minimum information needed for proper identification and the contest exchange
B	Be sure to sign only the last two letters of your call if there is a pileup calling the station
C	Work the station twice to be sure that you are in his log
D	All of these choices are correct

33. - T8D06

What does the abbreviation PSK mean?

Select	Answer
A	Phased Slide Keying
B	Phase Shift Keying
C	Pulse Shift Keying
D	Packet Short Keying

34. - T9A09

What is the approximate length, in inches, of a 6 meter 1/2-wavelength wire dipole antenna?

Select	Answer
A	50
B	236
C	112
D	6

35. - T9B08

Why should coax connectors exposed to the weather be sealed against water intrusion?

Select	Answer
A	To keep the jacket from becoming loose
B	To prevent interference to telephones
C	All of these choices are correct
D	To prevent an increase in feedline loss

Figure T1