Extra Practice Exam -- Effective July 2008

---

E4D04
What is an effective way to reduce or eliminate intermodulation interference between two repeater transmitters operating in close proximity to one another?
A. By installing a band-pass filter in the feed line between the transmitter and receiver
B. By installing a properly terminated circulator at the output of the transmitter
C. By using a Class C final amplifier
D. By using a Class D final amplifier

E1D06
Which of the following special provisions must a space station incorporate in order to comply with space station requirements?
A. The space station must be capable of effecting a cessation of transmissions by telecommand when so ordered by the FCC
B. The space station must cease all transmissions after 5 years
C. The space station must be capable of changing its orbit whenever such a change is ordered by NASA
D. The station call sign must appear on all sides of the spacecraft

E8A11
What is one use for a pulse modulated signal?
A. Linear amplification
B. PSK31 data transmission
C. Multiphase power transmission
D. Digital data transmission

E5D18
How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200V AC at 5 amperes?
A. 200 watts
B. 1000 watts
C. 1600 watts
D. 600 watts

E4C15
What is the primary source of noise that can be heard from an HF-band receiver with an antenna connected?
A. Detector noise
B. Induction motor noise
C. Receiver front-end noise
D. Atmospheric noise

E7F09
What determines the accuracy of a frequency counter?
A. The accuracy of the time base
B. The speed of the logic devices used
C. Accuracy of the AC input frequency to the power supply
D. Proper balancing of the mixer diodes

E6F12
Which of the following types of photovoltaic cell has the highest efficiency?
A. Silicon
B. Silver iodide
C. Selenium
D. Gallium arsenide

E1B05
What height restrictions apply to an amateur station antenna structure not close to a public use airport unless the FAA is notified and it is registered with the FCC?
A. It must not extend more than 300 feet above average height of terrain surrounding the site
B. It must be no higher than 200 feet above ground level at its site
C. There are no height restrictions because the structure obviously would not be a hazard to aircraft in flight
D. It must not extend more than 100 feet above sea level or the rim of the nearest valley or canyon

E9B07
If the boom of a Yagi antenna is lengthened and the elements are properly retuned, what usually occurs?
A. The gain increases
B. The SWR decreases
C. The front-to-back ratio increases
D. The gain bandwidth decreases rapidly

E2A07
Which of the following types of signals can be relayed through a linear transponder?
A. FM and CW
B. SSB and SSTV
C. PSK and Packet
D. All these answers are correct

E9C04
Which of the following describes a basic rhombic antenna?
A. Unidirectional; four-sided, each side one quarter-wavelength long; terminated in a resistance equal to its characteristic impedance
B. Bidirectional; four-sided, each side one or more wavelengths long; open at the end opposite the transmission line connection
C. Four-sided; an LC network at each corner except for the transmission connection;
D. Four-sided, each side of a different physical length

E4A03
Which of the following parameters would a typical spectrum analyzer display on the vertical axis?
A. Amplitude
B. Duration
C. SWR
D. Q

E6E07
What is the characteristic impedance of circuits in which almost all MMICs are designed to work?
A. 50 ohms
B. 300 ohms
C. 450 ohms
D. 10 ohms

E3C06
How much farther does the VHF/UHF radio-path horizon distance exceed the geometric horizon?
A. By approximately 15% of the distance
B. By approximately twice the distance
C. By approximately one-half the distance
D. By approximately four times the distance

E2D11
Which of the following data sources are needed to accurately transmit your geographical location over the APRS network?
A. The NMEA-0183 formatted data from a Global Positioning System (GPS) satellite receiver
B. The latitude and longitude of your location, preferably in degrees, minutes and seconds, entered into the APRS computer software
C. The NMEA-0183 formatted data from a LORAN navigation system
D. Any of these choices is correct

E6A04
What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?
A. Insulator impurity
B. N-type impurity
C. Acceptor impurity
D. Donor impurity

E9E11
What is an effective way of matching a feed-line to a VHF or UHF antenna when the impedances of both the antenna and feed-line are unknown?
A. Use a 50-ohm 1:1 balun between the antenna and feed-line
B. Use the "universal stub" matching technique
C. Connect a series-resonant LC network across the antenna feed terminals
D. Connect a parallel-resonant LC network across the antenna feed terminals

E7B10
In Figure E7-1, what is the purpose of R3?
A. Fixed bias
B. Emitter bypass
C. Output load resistor
D. Self bias

E9G08
What is the process of normalization with regard to a Smith chart?
A. Reassigning resistance values with regard to the reactance axis
B. Reassigning reactance values with regard to the resistance axis
C. Reassigning impedance values with regard to the prime center
D. Reassigning prime center with regard to the reactance axis

E5B10
What is the relationship between the current through an inductor and the voltage across an inductor?
A. Voltage leads current by 90 degrees
B. Current leads voltage by 90 degrees
C. Voltage and current are 180 degrees out of phase
D. Voltage and current are in phase

E9A01
Which of the following describes an isotropic Antenna?
A. A grounded antenna used to measure earth conductivity
B. A horizontal antenna used to compare Yagi antennas
C. A theoretical antenna used as a reference for antenna gain
D. A spacecraft antenna used to direct signals toward the earth

E1C08
What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?
A. 30 seconds
B. 3 minutes
C. 5 minutes
D. 10 minutes

E7H16
What is a phase-locked loop circuit?
A. An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
B. An electronic circuit also known as a monostable multivibrator
C. An electronic servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator
D. An electronic circuit consisting of a precision push-pull amplifier with a differential input

E4B06
If a frequency counter with a specified accuracy of +/- 10 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?
A. 146.52 Hz
B. 10 Hz
C. 146.52 kHz
D. 1465.20 Hz

E5C23
Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300-ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?
A. Point 1
B. Point 3
C. Point 5
D. Point 8

E9F15
What kind of impedance does a 1/2-wavelength transmission line present to a generator when the line is open at the far end?
A. A very high impedance
B. A very low impedance
C. The same as the characteristic impedance of the line
D. The same as the output impedance of the generator

E7C04
How does a network transform a complex impedance to a resistive impedance?
A. It introduces negative resistance to cancel the resistive part of an impedance
B. It introduces transconductance to cancel the reactive part of an impedance
C. It cancels the reactive part of an impedance and transforms the resistive part to the desired value
D. Network resistances are substituted for load resistances

E2B01
How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?
A. 30
B. 60
C. 90
D. 120

E3A08
What frequency range would you normally tune to find EME stations in the 70 cm band?
A. 430.000 - 430.150 MHz
B. 430.100 - 431.100 MHz
C. 431.100 - 431.200 MHz
D. 432.000 - 432.100 MHz

E4E03
Which of the following signals might a receiver noise blanker be able to remove from desired signals?
A. Signals which are constant at all IF levels
B. Signals which appear correlated across a wide bandwidth
C. Signals which appear at one IF but not another
D. Signals which have a sharply peaked frequency distribution

E5A17
What is the resonant frequency of a parallel RLC circuit if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads?
A. 10.1 MHz
B. 63.2 MHz
C. 10.1 kHz
D. 63.2 kHz

E7G17
What is the typical output impedance of an integrated circuit op-amp?
A. Very low
B. Very high
C. 100 ohms
D. 1000 ohms

E8C05
What technique is used to minimize the bandwidth requirements of a PSK-31 signal?
A. Zero-sum character encoding
B. Reed-Solomon character encoding
C. Use of sinusoidal data pulses
D. Use of trapezoidal data pulses

E6B14
What type of bias is required for an LED to produce luminescence?
A. Reverse bias
B. Forward bias
C. Zero bias
D. Inductive bias

E8D14
What is the average power dissipated by a 50-ohm resistive load during one complete RF cycle having a peak voltage of 35 volts?
A. 12.2 watts
B. 9.9 watts
C. 24.5 watts
D. 16 watts

E6C03
What level of input voltage is a logic "high" in a TTL device operating with a positive 5-volt power supply?
A. 2.0 to 5.5 volts
B. 1.5 to 3.0 volts
C. 1.0 to 1.5 volts
D. -5.0 to -2.0 volts

E1A10
If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?
A. The control operator of the packet bulletin board station
B. The control operator of the originating station
C. The control operators of all the stations in the system
D. The control operators of all the stations in the system not authenticating the source from which they accept communications

E2E04
What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?
A. Selective fading has occurred
B. One of the signal filters has saturated
C. The receiver has drifted 5 kHz from the desired receive frequency
D. The mark and space signal have been inverted

E8B07
When using a pulse-width modulation system, why is the transmitter's peak power greater than its average power?
A. The signal duty cycle is less than 100%
B. The signal reaches peak amplitude only when voice modulated
C. The signal reaches peak amplitude only when voltage spikes are generated within the modulator
D. The signal reaches peak amplitude only when the pulses are also amplitude modulated

E9H06
What is the triangulation method of direction finding?
A. The geometric angle of sky waves from the source are used to determine its position
B. A fixed receiving station plots three headings from the signal source on a map
C. Antenna headings from several different receiving stations are used to locate the signal source
D. A fixed receiving station uses three different antennas to plot the location of the signal source

E0A07
What is the "far-field" zone of an antenna?
A. The area of the ionosphere where radiated power is not refracted
B. The area where radiated power dissipates over a specified time period
C. The area where radiated field strengths are obstructed by objects of reflection
D. The area where the shape of the antenna pattern is independent of distance

E3B11
What communications are possible during gray-line propagation?
A. Contacts up to 2,000 miles only on the 10-meter band
B. Contacts up to 750 miles on the 6- and 2-meter bands
C. Contacts up to 8,000 to 10,000 miles on three or four HF bands
D. Contacts up to 12,000 to 15,000 miles on the 2 meter and 70 centimeter bands

E2C10
Why might a phone DX station state that he is listening on another frequency?
A. Because the DX station may be transmitting on a frequency that is prohibited to some responding stations
B. To separate the calling stations from the DX station
C. To reduce interference, thereby improving operating efficiency
D. All of these choices are correct

E6D10
What is one important reason for using powdered-iron toroids rather than ferrite toroids in an inductor?
A. Powdered-iron toroids generally have greater initial permeabilities
B. Powdered-iron toroids generally have better temperature stability
C. Powdered-iron toroids generally require fewer turns to produce a given inductance value
D. Powdered-iron toroids have the highest power handling capacity

E7A13
What is the name for logic which represents a logic "0" as a high voltage?
A. Reverse Logic
B. Assertive Logic
C. Negative logic
D. Positive Logic

E9D08
What happens to the bandwidth of an antenna as it is shortened through the use of loading coils?
A. It is increased
B. It is decreased
C. No change occurs
D. It becomes flat

E7E14
Which of the following describes a common means of generating a SSB signal when using digital signal processing?
A. Mixing products are converted to voltages and subtracted by adder circuits
B. A frequency synthesizer removes the unwanted sidebands
C. Emulation of quartz crystal filter characteristics
D. The phasing or quadrature method

E7D13
What is the purpose of D1 in the circuit shown in Figure E7-3?
A. To provide line voltage stabilization
B. To provide a voltage reference
C. Peak clipping
D. Hum filtering

E1E15
What must the VE team do if an examinee scores a passing grade on all examination elements needed for an upgrade or new license?
A. Photocopy all examination documents and forwards them to the FCC for processing
B. Three VEs must certify that the examinee is qualified for the license grant and that they have complied with the VE requirements
C. Issue the examinee the new or upgrade license
D. All these answers are correct

E1F09
When may the control operator of a repeater accept payment for providing communication services to another party?
A. When the repeater is operating under portable power
B. When the repeater is operating under local control
C. During Red Cross or other emergency service drills
D. Under no circumstances