US Amateur Radio - Amateur Extra 2002 Practice Test

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1. - E1A16

For each ITU Region, how is each frequency band allocated internationally to the amateur service designated?

Select	Answer
A	Primary service or secondary service
B	Co-secondary service
C	Primary service
D	Secondary service

2. - E1B04

If an amateur station causes interference to the reception of a domestic broadcast station with a receiver of good engineering design, on what frequencies may the operation of the amateur station be restricted?

Select	Answer
A	On all frequencies above 30 MHz
B	On all frequencies below 30 MHz
C	On the frequency used by the domestic broadcast station
D	On the frequency or frequencies used when the interference occurs

3. - E1C02

Who is authorized for alien reciprocal operation in places where the FCC regulates the amateur service?

Select	Answer
A	Anyone holding a valid amateur service license issued by a foreign government with which the US has a reciprocal operating arrangement
B	Any non-US citizen holding an amateur service license issued by their government with which the US has a reciprocal operating arrangement
C	Any non-US citizen holding a valid amateur license issued by a foreign government, as long as the person is a citizen of that country
D	Anyone holding a valid amateur service license issued by a foreign government

4. - E1D06

What are the frequencies authorized to an amateur station participating in RACES during a period when the President's War Emergency Powers are in force?

Select	Answer
A	Specific segments in the amateur service MF, HF, VHF and UHF bands
B	Specific local government channels
C	Military Affiliate Radio System (MARS) channels
D	All frequencies in the amateur service authorized to the control operator

5. - E1E04

What is an earth station in the amateur-satellite service?

Select	Answer
A	Any amateur station on the surface of the Earth
B	An amateur station that is not able to communicate using amateur satellites
C	An amateur station within 50 km of the Earth's surface for communications with Amateur stations by means of objects in space
D	An amateur station that transmits telemetry consisting of measurement of upper atmosphere data from space

6. - E1F11

Which persons seeking to be VEs cannot be accredited?

Select	Answer
A	Persons who are employees of the federal government
B	Persons holding less than an Advanced Class operator license
C	Persons less than 21 years of age
D	Persons who have ever had an amateur operator or amateur station license suspended or revoked

7. - E1G06

What is the National Radio Quiet Zone?

Select	Answer
A	An Area in Maryland, West Virginia and Virginia surrounding the National Radio Astronomy Observatory
B	An area in Puerto Rico surrounding the Arecibo Radio Telescope
C	An area in Florida surrounding Cape Canaveral
D	An area in New Mexico surrounding the White Sands Test Area

8. - E2A02

What is the direction of a descending pass for an amateur satellite?

Select	Answer
A	From west to east
B	From east to west
C	From north to south
D	From south to north

9. - E2B11

What is the approximate transmission time per frame for a fax picture transmitted by an amateur station at 240 lpm?

Select	Answer
A	6 seconds
B	6 minutes
C	3.3 minutes
D	1/60 second

10. - E2C11

When operating SSB in a VHF contest, how should you attempt to contact a station calling CQ while a pileup of other stations are also trying to contact the same station?

Select	Answer
A	By sending your full call sign and grid square as soon as you hear the distant station transmit QRZ
B	By sending your full call sign after the distant station transmits QRZ
C	By sending only the last letters of your call sign after the distant station transmits QRZ
D	By sending the call sign of the distant station three times, the words "this is", then your call sign three times

11. - E2D07

Which of the following digital protocols does APRS use?

Select	Answer
A	PACTOR
B	AMTOR
C	802.11
D	AX.25

12. - E2E08

Which of the following HF digital modes can be used to transfer binary files?

Select	Answer
A	Hellschreiber
B	RTTY
C	PACTOR
D	AMTOR

13. - E3A08

What frequency range would you normally tune to find EME stations in the 70-cm band?

Select	Answer
A	430.000 - 430.150 MHz
B	430.100 - 431.100 MHz
C	431.100 - 431.200 MHz
D	432.000 - 432.100 MHz

14. - E3B07

What is the typical reason for hearing an echo on the received signal of a station in Europe while directing your HF antenna toward the station?

Select	Answer
A	The station's transmitter is producing spurious emissions
B	The station's transmitter has poor frequency stability
C	Auroral conditions are causing a direct and a long-path reflected signal to be received
D	There are two signals being received, one from the most direct path and one from long-path propagation

15. - E3C14

What typical polarization does ground-wave propagation have?

Select	Answer
A	Circular
B	Elliptical
C	Horizontal
D	Vertical

16. - E4A02

What parameter does the horizontal axis of a spectrum analyzer display?

Select	Answer
A	Amplitude
B	Frequency
C	Resonance
D	Voltage

17. - E4B19

How can the frequency response of an oscilloscope be improved?

Select	Answer
A	By using a crystal oscillator as the time base and increasing the vertical sweep rate
B	By increasing the horizontal sweep rate and the vertical amplifier frequency response
C	By increasing the vertical sweep rate and the horizontal amplifier frequency response
D	By using a triggered sweep and a crystal oscillator as the time base

18. - E4C07

What is meant by the noise floor of a receiver?

Select	Answer
A	The weakest signal that can be detected under noisy atmospheric conditions
B	The amount of phase noise generated by the receiver local oscillator
C	The weakest signal that can be detected above the receiver internal noise
D	The minimum level of noise that will overload the receiver RF amplifier stage

19. - E4D08

How can it be determined if line-noise interference is being generated within your home?

Select	Answer
A	By checking the power-line voltage with a time-domain reflectometer
B	By observing the AC power line waveform with an oscilloscope
C	By turning off the AC power line main circuit breaker and listening on a battery-operated radio
D	By observing the AC power line voltage with a spectrum analyzer

20. - E4E09

Why is an antenna with a cardioid pattern desirable for a direction-finding system?

Select	Answer
A	The deep null of the cardioid pattern can pinpoint the direction of the desired station
B	The sharp peak response of the cardioid pattern can pinpoint the direction of the desired station
C	The high-radiation angle of the cardioid pattern is useful for short- distance direction finding
D	The broad-side responses of the cardioid pattern can be aimed at the desired station

21. - E5A17

What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 14.25 MHz and a Q of 187?

Select	Answer
A	13.1 kHz
B	22.3 kHz
C	10.8 kHz
D	76.2 kHz

22. - E5B03

What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial value of stored charge?

Select	Answer
A	A discharge factor of one
B	One time constant
C	An exponential discharge rate of one
D	One discharge period

23. - E5C11

In polar coordinates, what is the impedance of a network comprised of a 100- picofarad capacitor in parallel with a 4,000-ohm resistor at 500 kHz?

Select	Answer
A	2490 ohms, /__-51.5_degrees__
B	5112 ohms, /__-38.5_degrees__
C	4000 ohms, /__38.5_degrees__
D	2490 ohms, /__51.5_degrees__

24. - E5D11

What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 250 ohms, R is 1 kilohm, and XL is 500 ohms?

Select	Answer
A	81.47 degrees with the voltage lagging the current
B	81.47 degrees with the voltage leading the current
C	14.04 degrees with the voltage leading the current
D	14.04 degrees with the voltage lagging the current

25. - E5E21

Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?

Select	Answer
A	Point 5
B	Point 4
C	Point 6
D	Point 2

26. - E5F06

What device is used to store electrical energy in an electrostatic field?

Select	Answer
A	A transformer
B	A capacitor
C	A battery
D	An inductor

27. - E5G11

How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100-V AC at 4 amperes?

Select	Answer
A	50 watts
B	400 watts
C	2000 watts
D	80 watts

28. - E5H16

How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500 watts?

Select	Answer
A	704 W
B	355 W
C	1.42 mW
D	252 W

29. - E5I02

What happens to the conductivity of a photoconductive material when light shines on it?

Select	Answer
A	It decreases
B	It increases
C	It becomes unstable
D	It stays the same

30. - E6A16

What are the majority charge carriers in N-type semiconductor material?

Select	Answer
A	Holes
B	Free neutrons
C	Free electrons
D	Free protons

31. - E6B19

What is the capture range of a phase-locked loop circuit?

Select	Answer
A	The voltage range over which the circuit can lock
B	The frequency range over which the circuit can lock
C	The range of time it takes the circuit to lock
D	The input impedance range over which the circuit can lock

32. - E6C06

Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

Select	Answer
A	The input switching threshold is about two times the power supply voltage
B	The input switching threshold is about one-half the power supply voltage
C	Larger bypass capacitors are used in CMOS circuit design
D	Input signals are stronger

33. - E6D10

What is one important reason for using powdered-iron toroids rather than ferrite toroids in an inductor?

Select	Answer
A	Powdered-iron toroids generally have greater initial permeabilities
B	Powdered-iron toroids are easier to use with surface-mount technology
C	Powdered-iron toroids generally have better temperature stability
D	Powdered-iron toroids generally require fewer turns to produce a given inductance value

34. - E6E03

What is a crystal lattice filter?

Select	Answer
A	A filter with narrow bandwidth and steep skirts made using quartz crystals
B	A power supply filter made with interlaced quartz crystals
C	A filter with wide bandwidth and shallow skirts made using quartz crystals
D	An audio filter made with four quartz crystals that resonate at 1-kHz intervals

35. - E7A08

What logical operation does a NAND gate perform?

Select	Answer
A	It produces a logic "0" at its output only when all inputs are logic "1"
B	It produces a logic "1" at its output only when all inputs are logic "1"
C	It produces a logic "0" at its output if some but not all of its inputs are logic "1"
D	It produces a logic "0" at its output only when all inputs are logic "0"

36. - E7B02

Which class of amplifier provides the highest efficiency?

Select	Answer
A	Class C
B	Class B
C	Class AB
D	Class A

37. - E7C14

What is a pi-L-network?

Select	Answer
A	A Phase Inverter Load network
B	A matching network in which all components are isolated from ground
C	A network consisting of two inductors and two capacitors
D	A network with only three discrete parts

38. - E7D10

What device is typically used as a stable reference voltage in a linear voltage regulator?

Select	Answer
A	A Zener diode
B	A tunnel diode
C	An SCR
D	A varactor diode

39. - E7E04

How can a single-sideband phone signal be generated?

Select	Answer
A	By using a balanced modulator followed by a filter
B	By driving a product detector with a DSB signal
C	By using a reactance modulator followed by a mixer
D	By using a loop modulator followed by a mixer

40. - E7F11

What is the purpose of a frequency counter?

Select	Answer
A	To indicate the frequency of the strongest input signal which is within the counter's frequency range
B	To generate a series of reference signals at known frequency intervals
C	To compare the difference between the input and a voltage-controlled oscillator and produce an error voltage
D	To display all frequency components of a transmitted signal

41. - E7G09

When designing an op-amp RC active filter for a given frequency range and Q, why are the external capacitance values usually chosen first, then the external resistance values calculated?

Select	Answer
A	An op-amp will perform as an active filter using only standard external capacitance values
B	The equations for the calculations can only be used with known capacitance values
C	Capacitors with unusual capacitance values are not widely available, so standard values are used to begin the calculations
D	The calculations are easier to make with known capacitance values rather than with known resistance values

42. - E8A16

What is the approximate DC input power to a Class B RF power amplifier stage in an FM-phone transmitter when the PEP output power is 1500 watts?

Select	Answer
A	2500 watts
B	900 watts
C	4500 watts
D	1765 watts

43. - E8B24

What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz and accepting a maximum modulation rate of 3.5 kHz?

Select	Answer
A	47
B	0.47
C	2.14
D	0.214

44. - E8C16

What reduces interference from spread-spectrum transmitters to conventional communications in the same band?

Select	Answer
A	Special crystal filters are needed in conventional receivers to detect spread-spectrum signals
B	Spread-spectrum signals appear only as low-level noise in conventional receivers
C	A spread-spectrum transmitter avoids channels within the band which are in use by conventional transmitters
D	Spread-spectrum signals change too rapidly to be detected by conventional receivers

45. - E8D06

If an RMS reading AC voltmeter reads 65 volts on a sinusoidal waveform, what is the peak-to-peak voltage?

Select	Answer
A	130 volts
B	184 volts
C	92 volts
D	46 volts

46. - E9A01

Which of the following describes an isotropic radiator?

Select	Answer
A	A spacecraft radiator used to direct signals toward the earth
B	A grounded radiator used to measure earth conductivity
C	A horizontal radiator used to compare Yagi antennas
D	A theoretical radiator used to compare other antennas

47. - E9B03

In the free-space H-Field pattern shown in Figure E9-1, what is the front-to- back ratio?

Select	Answer
A	36 dB
B	24 dB
C	18 dB
D	14 dB

48. - E9C12

In the H field antenna radiation pattern shown in Figure E9-2, what is the elevation angle of the peak response?

Select	Answer
A	25 degrees
B	75 degrees
C	45 degrees
D	7.5 degrees

49. - E9D13

What happens to the bandwidth of an antenna as it is shortened through the use of loading coils?

Select	Answer
A	It is increased
B	It is decreased
C	No change occurs
D	It becomes flat

50. - E9E09

What is the typical velocity factor for a coaxial cable with polyethylene dielectric?

Select	Answer
A	0.66
B	0.10
C	0.30
D	2.70

Figure E5-2

Figure E9-1

Figure E9-2