HAM Radio 3/hamradioversion3.0examsandprograms1992.iso/exam/adv20/adv6.dat

Text File | 1991-11-20 | 17KB | 495 lines

285F-4.4   A 6-11  Long life
What are the advantages of using an LED?
A. Low power consumption and long life
B. High lumens per cm per cm and low power consumption
C. High lumens per cm per cm and low voltage requirement
D. A current flows when the device is exposed to a light source
*
286F-4.5   D 6-11  Green is Great
What colors are available in LEDs?
A. Yellow, blue, red and brown
B. Red, violet, yellow and peach
C. Violet, blue, orange and red
D. Red, green, orange and yellow
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287F-4.6   C 6-12  The NE-2 has Two identical|electrodes and a solid dot|to indicate gas filled
What is the schematic symbol for a neon lamp?
|

   A.     ╔════════╗        B.              │
          ║   ┌────╫───            ───O     ├───
          ║   └────╫───                     │
          ╚════════╝                     ▀
   C.                       D.        ┌┬──┬┐
          ──┤o   o├───             ───┤│  │├───
               ■                      └┴──┴┘
*
288F-4.7   B 6-12  NE-2
What type neon lamp is usually used in amateur
radio work?
A. NE-1
B. NE-2
C. NE-3
D. NE-4
*
289F-4.8   A 6-12  67 Volts
What is the DC starting voltage for an NE-2 neon lamp?
A. Approximately 67 volts
B. Approximately 5 volts
C. Approximately 5.6 volts
D. Approximately 110 volts
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290F-4.9   D 6-12  About 2/3 of DC starting voltage
What is the AC starting voltage for an NE-2 neon lamp?
A. Approximately 110-V AC RMS
B. Approximately 5-V AC RMS
C. Approximately 5.6-V AC RMS
D. Approximately 48-V AC RMS
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291F-4.10  D 6-12  Lites with RF
How can a neon lamp be used to check for the presence of RF?
A. A neon lamp will go out in the presence of RF
B. A neon lamp will change color in the presence of RF
C. A neon lamp will light only in the presence of very low
   frequency RF
D. A neon lamp will light in the presence of RF
*
292F-5.1   B 6-13  SSB is about 2.4 kHz wide
What would be the bandwidth of a good crystal lattice
band-pass filter for a single-sideband phone emission?
A. 6 kHz at -6 dB
B. 2.1 kHz at -6 dB
C. 500 Hz at -6 dB
D. 15 kHz at - 6 dB
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293F-5.2   C 6-13  AM is about 6.0 kHz wide
What would be the bandwidth of a good crystal lattice
band-pass filter for a double-sideband phone emission?
A. 1 kHz at -6 dB
B. 500 Hz at - 6 dB
C. 6 kHz at -6 dB
D. 15 kHz at -6 dB
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294F-5.3   D 6-12  Steep skirts
What is a crystal lattice filter?
A. A power supply filter made with crisscrossed quartz crystals
B. An audio filter made with 4 quartz crystals at 1-kHz intervals
C. A filter with infinitely wide and shallow skirts made using
   quartz crystals
D. A filter with narrow bandwidth and steep skirts made using
   quartz crystals
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295F-5.4   D 6-13  Grinding & etching to|correct frequency
What technique can be used to construct low cost, high
performance crystal lattice filters?
A. Splitting and tumbling
B. Tumbling and grinding
C. Etching and splitting
D. Etching and grinding
*
296F-5.5   A 6-12  Frequency differences between|the various crystals
What determines the bandwidth and response shape in a crystal
lattice filter?
A. The relative frequencies of the individual crystals
B. The center frequency chosen for the filter
C. The amplitude of the RF stage preceding the filter
D. The amplitude of the signals passing through the filter
*
297G-1.1   D 7-1   The conduction of a control|element is varied
What is a linear electronic voltage regulator?
A. A regulator that has a ramp voltage as its output
B. A regulator in which the pass transistor switches from the
   "off" state to the "on" state
C. A regulator in which the control device is switched on or
   off, with the duty cycle proportional to the line or load
   conditions
D. A regulator in which the conduction of a control element
   is varied in direct proportion to the line voltage or load
   current
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298G-1.2   C 7-2   Control devices are|switched on or off
What is a switching electronic voltage regulator?
A. A regulator in which the conduction of a control element
   is varied in direct proportion to the line voltage or load
   current
B. A regulator that provides more than one output voltage
C. A regulator in which the control device is switched on or
   off, with the duty cycle proportional to the line or load
   conditions
D. A regulator that gives a ramp voltage at its output
*
299G-1.3   A 7-1   Zener
What device is usually used as a stable reference voltage in
a linear voltage regulator?
A. A Zener diode
B. A tunnel diode
C. An SCR
D. A varactor diode
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300G-1.4   B 7-5   Series
What type of linear regulator is used in applications requiring
efficient utilization of the primary power source?
A. A constant current source
B. A series regulator
C. A shunt regulator
D. A shunt current source
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301G-1.5   D 7-5   Shunt regulator
What type of linear voltage regulator is used in applications
where the load on the unregulated voltage source must be kept
constant?
A. A constant current source
B. A series regulator
C. A shunt current source
D. A shunt regulator
*
302G-1.6   C 7-3   Six volts
To obtain the best temperature stability, what should be the
operating voltage of the reference diode in a linear voltage
regulator?
A. Approximately 2.0 volts
B. Approximately 3.0 volts
C. Approximately 6.0 volts
D. Approximately 10.0 volts
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303G-1.7   A 7-5   Feedback connection(sensing)|is made directly to the load
What is the meaning of the term remote sensing with regard
to a linear voltage regulator?
A. The feedback connection to the error amplifier is made
   directly to the load
B. Sensing is accomplished by wireless inductive loops
C. The load connection is made outside the feedback loop
D. The error amplifier compares the input voltage to the
   reference voltage
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304G-1.8   D 7-8   Has three connections and|supplies only one voltage
What is a three-terminal regulator?
A. A regulator that supplies three voltages with variable current
B. A regulator that supplies three voltages at a constant current
C. A regulator containing three error amplifiers and sensing
   transistors
D. A regulator containing a voltage reference, error amplifier,
   sensing resistors and transistors, and a pass element
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305G-1.9   B 7-9   No minimum output |current or voltage
What are the important characteristics of a three-terminal
regulator?
A. Maximum and minimum input voltage, minimum output current
   and voltage
B. Maximum and minimum input voltage, maximum output
   current and voltage
C. Maximum and minimum input voltage, minimum output current
   and maximum output voltage
D. Maximum and minimum input voltage, minimum output voltage
   and maximum output current
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306G-2.1   B 7-25  "A"lways on, ie 360°
What is the distinguishing feature of a Class A amplifier?
A. Output for less than 180 degrees of the signal cycle
B. Output for the entire 360 degrees of the signal cycle
C. Output for more than 180 degrees and less than 36O degrees
   of the signal cycle
D. Output for exactly 180 degrees of the input signal cycle
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307G-2.2   A 7-25  "A"lways on
What class of amplifier is distinguished by the presence
of output throughout the entire signal cycle and the input
never goes into the cutoff region?
A. Class A
B. Class B
C. Class C
D. Class D
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308G-2.3   D 7-25  50% duty cycle equals 180°|or half-way "B"etween 360°|and 0°
What is the distinguishing characteristic of a Class B
amplifier?
A. Output for the entire input signal cycle
B. Output for greater than 180 degrees and less than
   360 degrees of the input signal cycle
C. Output for less than 180 degrees of the input signal
   cycle
D. Output for 180 degrees of the input signal cycle
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309G-2.4   B 7-25  "B"etween 0° and 360°
What class of amplifier is distinguished by the flow of
current in the output essentially in 180 degree pulses?
A. Class A
B. Class B
C. Class C
D. Class D
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310G-2.5   A 7-25  Greater than  180°|Always Beyond 180°
What is a Class AB amplifier?
A. Output is present for more than 180 degrees but less than
   360 degrees of the signal input cycle
B. Output is present for exactly 180 degrees of the input
   signal cycle
C. Output is present for the entire input signal cycle
D. Output is present for less than 180 degrees of the input
   signal cycle
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311G-2.6   A 7-25  Less than 180°
What is the distinguishing feature of a Class C amplifier?
A. Output is present for less than 180 degrees of the input
   signal cycle
B. Output is present for exactly 180 degrees of the input signal
   cycle
C. Output is present for the entire input signal cycle
D. Output is present for more than 180 degrees but less than
   360 degrees of the input signal cycle
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312G-2.7   C 7-25  "C"utoff
What class of amplifier is distinguished by the bias being
set well beyond cutoff?
A. Class A
B. Class B
C. Class C
D. Class AB
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313G-2.8   C 7-26  Effi"C"iency
Which class of amplifier provides the highest
efficiency?
A. Class A
B. Class B
C. Class C
D. Class AB
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314G-2.9   A 7-26  Class "A" act
Which class of amplifier has the highest linearity and
least distortion?
A. Class A
B. Class B
C. Class C
D. Class AB
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315G-2.10  D 7-25  Always Beyond 180°
Which class of amplifier has an operating angle of more than
180 degrees but less than 360 degrees when driven by a sine
wave signal?
A. Class A
B. Class B
C. Class C
D. Class AB
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316G-3.1   B 7-43  An L has two "legs",  an|inductor and a capacitor
What is an L-network?
A. A network consisting entirely of four inductors
B. A network consisting of an inductor and a capacitor
C. A network used to generate a leading phase angle
D. A network used to generate a lagging phase angle
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317G-3.2   D 7-43  A pi-network resembles the Greek|letter pi(π). π has three "legs"
What is a pi-network?
A. A network consisting entirely of four inductors or four
   capacitors
B. A Power Incidence network
C. An antenna matching network that is isolated from ground
D. A network consisting of one inductor and two capacitors
   or two inductors and one capacitor
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318G-3.3   B 7-44  Two by two
What is a pi-L-network?
A. A Phase Inverter Load network
B. A network consisting of two inductors and two capacitors
C. A network with only three discrete parts
D. A matching network in which all components are isolated
   from ground
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319G-3.4   D 7-44  The more the better  Pi-L
Does the L-, pi-, or pi-L-network provide the greatest
harmonic suppression?
A. L-network
B. Pi-network
C. Inverse L-network
D. Pi-L-network
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320G-3.5   C 7-43  L, π, & π-L
What are the three most commonly used networks to accomplish a
match between an amplifying device and a transmission line?
A. M-network, pi-network and T-network
B. T-network, M-network and Q-network
C. L-network, pi-network and pi-L-network
D. L-network, M-network and C-network
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321G-3.6   D 7-43  Cancel reactive part and|change resistive part
How are networks able to transform one impedance to another?
A. Resistances in the networks substitute for resistances in
   the load
B. The matching network introduces negative resistance to cancel
   the resistive part of an impedance
C. The matching network introduces transconductance to cancel
   the reactive part of an impedance
D. The matching network can cancel the reactive part of an
   impedance and change the value of the resistive part of an
   impedance
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322G-3.7   B 7-43  π
Which type of network offers the greater transformation
ratio?
A. L-network
B. Pi-network
C. Constant-K
D. Constant-M
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323G-3.8   A 7-43  Small range
Why is the L-network of limited utility in impedance
matching?
A. It matches a small impedance range
B. It has limited power handling capabilities
C. It is thermally unstable
D. It is prone to self resonance
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324G-3.9   D 7-44  Harmonic suppression
What is an advantage of using a pi-L-network instead of a
pi-network for impedance matching between the final amplifier
of a vacuum-tube type transmitter and a multiband antenna?
A. Greater transformation range
B. Higher efficiency
C. Lower losses
D. Greater harmonic suppression
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325G-3.10  C 7-44  π-L
Which type of network provides the greatest harmonic
suppression?
A. L-network
B. Pi-network
C. Pi-L-network
D. Inverse-Pi network
*
326G-4.1   A 7-45  -pass
What are the three general groupings of filters?
A. High-pass, low-pass and band-pass
B. Inductive, capacitive and resistive
C. Audio, radio and capacitive
D. Hartley, Colpitts and Pierce
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327G-4.2   C 7-49  Constant impedance product
What is a constant-K filter?
A. A filter that uses Boltzmann's constant
B. A filter whose velocity factor is constant over a wide
   range of frequencies
C. A filter whose product of the series- and shunt-element
   impedances is a constant for all frequencies
D. A filter whose input impedance varies widely over the
   design bandwidth
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328G-4.3   A 7-49  High attenuation
What is an advantage of a constant-k filter?
A. It has high attenuation for signals on frequencies far removed
   from the passband
B. It can match impedances over a wide range of frequencies
C. It uses elliptic functions
D. The ratio of the cutoff frequency to the trap frequency can be
   varied
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329G-4.4   D 7-49  Traps undesired frequencies|near cutoff
What is an m-derived filter?
A. A filter whose input impedance varies widely over
   the design bandwidth
B. A filter whose product of the series- and shunt-
   element  impedances is a constant for all frequencies
C. A filter whose schematic shape is the letter "M"
D. A filter that uses a trap to attenuate undesired
   frequencies too near cutoff for a constant-k filter
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330G-4.5   C 7-49  Flat response in passband  |A smooth(buttered) response
What are the distinguishing features of a Butterworth filter?
A. A filter whose product of the series- and shunt-element
   impedances is a constant for all frequencies
B. It only requires capacitors
C. It has a maximally flat response over its passband
D. It requires only inductors
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331G-4.6   B 7-49  Russians are always making Ripples
What are the distinguishing features of a Chebyshev filter?
A. It has a maximally flat response over its passband
B. It allows ripple in the passband
C. It only requires inductors
D. A filter whose product of the series- and shunt-element
   impedances is a constant for all frequencies
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332G-4.7   B 7-49  Sharp cut-off
When would it be more desirable to use an m-derived filter
over a constant-k filter?
A. When the response must be maximally flat at one frequency
B. When you need more attenuation at a certain frequency that
   is too close to the cut-off frequency for a constant-k filter
C. When the number of components must be minimized
D. When high power levels must be filtered
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333G-5.1   C 7-38  Positive feedback
What condition must exist for a circuit to oscillate?
A. It must have a gain of less than 1
B. It must be neutralized
C. It must have positive feedback sufficient to
   overcome losses
D. It must have negative feedback sufficient to
   cancel the input
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334G-5.2   D 7-39  Colpitts & Pierce
What are three major oscillator circuits often used in
amateur radio equipment?
A. Taft, Pierce and negative feedback
B. Colpitts, Hartley and Taft
C. Taft, Hartley and Pierce
D. Colpitts, Hartley and Pierce
*
335G-5.3   D 7-39  Coil tap
How is the positive feedback coupled to the input in a
Hartley oscillator?
A. Through a neutralizing capacitor
B. Through a capacitive divider
C. Through link coupling
D. Through a tapped coil
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336G-5.4   C 7-39  Colpitts has a Capacitive divider
How is the positive feedback coupled to the input in a
Colpitts oscillator?
A. Through a tapped coil
B. Through link coupling
C. Through a capacitive divider
D. Through a neutralizing capacitor
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337G-5.5   D 7-39  Pierce has capacitive couPling
How is the positive feedback coupled to the input in a
Pierce oscillator?
A. Through a tapped coil
B. Through link coupling
C. Through a capacitive divider
D. Through capacitive coupling
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338G-5.6   D 7-39  Quartz is hard to Pierce
Which of the three major oscillator circuits used in
amateur radio equipment utilizes a quartz crystal?
A. Negative feedback
B. Hartley
C. Colpitts
D. Pierce
*
339G-5.7   A 7-39  Mechanical/Voltage
What is the piezoelectric effect?
A. Mechanical vibration of a crystal by the application of
   a voltage
B. Mechanical deformation of a crystal by the application
   of a magnetic field
C. The generation of electrical energy by the application
   of light
D. Reversed conduction states when a P-N junction is exposed
   to light
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340G-5.8   B 7-39  No LC, uses a quartz crystal
What is the major advantage of a Pierce oscillator?
A. It is easy to neutralize
B. It doesn't require an LC tank circuit
C. It can be tuned over a wide range
D. It has a high output power
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341G-5.9   B 7-39  Colpitts for its frequency stability
Which type of oscillator circuit is commonly used in a VFO?
A. Pierce
B. Colpitts
C. Hartley
D. Negative feedback
*