HAM Radio 3.2/Ham Radio Version 3.2 (Chestnut CD-ROMs)(1993).ISO/exam/tec20/tec7.dat

Text File | 1991-11-20 | 18KB | 403 lines

222F-2-3.3 A 4-10  Inserting an iron core into a|coil increases the inductance
As an iron core is inserted in a coil, what happens to
 the inductance?
A. It increases
B. It decreases
C. It stays the same
D. It becomes voltage-dependent
*
223F-2-3.4 B 4-10  Inserting an brass core into a|coil decreases the inductance
As a brass core is inserted in a coil, what happens to
 the inductance?
A. It increases
B. It decreases
C. It stays the same
D. It becomes voltage-dependent
*
224F-2-4.1 A 4-11  Looks like an inductor symbol   |with a arrow through it
What is the symbol used to represent an adjustable inductor on
 schematic diagrams?
|
                    ─┐
         ┌─┬─┬─┬─┬─/─┬─┐                 \
    A.   │ │ │ │ / │ │ │       B.       ──┤├──
               /                            \
                                             ─┘
                    ─┐
                   /
    C.   ──/\/\/\/\/\/\──      D.   ──/\/\/\/\/\/\──
               /                            
*
225F-2-4.2 B 4-11  Looks like an inductor symbol   |with a pair of bars added
What is the symbol used to represent an iron-core inductor on
 schematic diagrams?
|
           ════════════              ═════════════
    A.   ──/\/\/\/\/\/\─       B.    ┌─┬─┬─┬─┬─┬─┐
                                     │ │ │ │ │ │ │

             ┌─┐║                     ═══════════
    C.      ─┤ │║              D.      ┌───────┐
            ─┤ │║                    ──┤   Z   ├──
             └─┘║                      └───────┘
*
226F-2-4.3 C 4-11  Looks like an inductor symbol   |with a pair of bars added
What is the symbol used to represent an inductor wound over a
 toroidal core on schematic diagrams?
|
                                    ╔═════════╗
           ═════════                ║┌─┬─┬─┬─┐║
    A.        ┌─┐             B.    ║├─     ─┤║
           ───┤ ├───                ║├─     ─┤║
              └─┘                    └─┐   ┌─┘
          ═════════════              ═══════════
    C.    ┌─┬─┬─┬─┬─┬─┐        D.     ┌───────┐
          │ │ │ │ │ │ │             ──┤   Z   ├──
                                      └───────┘
*
227F-3-1.1 D 4-12  A  capacitor dielectric is the |insulating material between the|plates and it could be air
What is a capacitor dielectric?
A. The insulating material used for the plates
B. The conducting material used between the plates
C. The ferrite material that the plates are mounted on
D. The insulating material between the plates
*
228F-3-1.2 A 4-12  A capacitor is made up of two or|more conductive sheets separated|by an insulator like air
What are the component parts of a capacitor?
A. Two or more conductive plates with an insulating material
   between them
B. The wire used in the winding and the core material
C. Two or more layers of silicon material
D. Two insulating plates with a conductive material between them
*
229F-3-1.3 C 4-14  An electrolytic is a capacitor whose|dielectric is formed by an electro- |chemical action
What is an electrolytic capacitor?
A. A capacitor whose plates are formed on a thin ceramic layer
B. A capacitor whose plates are separated by a thin strip of
   mica insulation
C. A capacitor whose dielectric is formed on one set of plates
   through electrochemical action
D. A capacitor whose value varies with applied voltage
*
230F-3-1.4 C 4-13  A  paper capacitor is a capacitor|which uses paper as a dielectric
What is a paper capacitor?
A. A capacitor whose plates are formed on a thin ceramic layer
B. A capacitor whose plates are separated by a thin strip of
   mica insulation
C. A capacitor whose plates are separated by a layer of paper
D. A capacitor whose dielectric is formed on one set of plates
   through electrochemical action
*
231F-3-2.1 B 4-12  A capacitor stores energy |in an electric field and  |opposes changes in voltage
What is a capacitor?
A. An electronic component that stores energy in a
   magnetic field
B. An electronic component that stores energy in an
   electric field
C. An electronic component that converts a high
   voltage to a lower voltage
D. An electronic component that converts power into heat
*
232F-3-2.2 D 4-11  A capacitor stores a charge|electrostatically & opposes|a change in voltage
What are the electrical properties of a capacitor?
A. A capacitor stores a charge electrochemically and
   opposes a change in current
B. A capacitor stores a charge electromagnetically
   and opposes a change in current
C. A capacitor stores a charge electromechanically
   and opposes a change in voltage
D. A capacitor stores a charge electrostatically and
   opposes a change in voltage
*
233F-3-2.3 A 4-12  To avoid repeating the |Big Bang, check voltage
What factors must be considered when selecting a capacitor
for a circuit?
A. Type of capacitor, capacitance and voltage rating
B. Type of capacitor, capacitance and the kilowatt-hour rating
C. The amount of capacitance, the temperature coefficient and
   the KVA rating
D. The type of capacitor, the microscopy coefficient and the
   temperature coefficient
*
234F-3-2.4 B 4-12  In microfarads|or picofarads |and volts
How are the characteristics of a capacitor usually specified?
A. In volts and amperes
B. In microfarads and volts
C. In ohms and watts
D. In millihenrys and amperes
*
235F-3-3.1 A 4-12  The dielectric constant, spacing |between the plates, and the total|active plate area
What factors determine the amount of capacitance in a capacitor?
A. The dielectric constant of the material between the plates,
   the area of one side of one plate, the separation between the
   plates and the number of plates
B. The dielectric constant of the material between the plates, the
   number of plates and the diameter of the leads connected to
   the plates
C. The number of plates, the spacing between the plates and
   whether the dielectric material is N type or P type
D. The dielectric constant of the material between the plates,
   the surface area of one side of one plate, the number of plates
   and the type of material used for the protective coating
*
236F-3-3.2 B 4-12  Increasing the plate area|of a capacitor increases |the capacitance
As the plate area of a capacitor is increased, what happens
 to its capacitance?
A. Decreases
B. Increases
C. Stays the same
D. Becomes voltage dependent
*
237F-3-3.3 D 4-12  Increasing the spacing between the |plates in a capacitor decreases the|capacitance
As the plate spacing of a capacitor is increased, what
 happens to its capacitance?
A. Increases
B. Stays the same
C. Becomes voltage dependent
D. Decreases
*
238F-3-4.1 D 4-13  The symbol used to represent an|electrolytic is the same as a  |capacitor (─┤├─), with a + sign
What is the symbol used to represent an electrolytic capacitor on
 schematic diagrams?
|
                                         ┌─┐
             ┌┬───┬┐─┼─                 ││ ││ ─┼─
     A.   ───┤│   │├───         B.   ───┤│ │├───
             └┴───┴┘                    ││ ││
                                         └─┘
                │                        │ │ ─┼─
     C.    ───┤ ├───            D.    ───┤ ├───
           ──   │ ─┼─                    │ │
*
239F-3-4.2 A 4-14  Symbol used to represent a variable |capacitor is the same as a capacitor|(─┤├─), with an arrow through it
What is the symbol used to represent a variable capacitor on
 schematic diagrams?
|
                  ─┐                         ─┐
              │ │/                    ─┼─│  /──
     A.    ───┤/├───            B.    ───┤/├───
             /│ │                       /│
              ┌─┐  ─┐                         ─┐
             ││ ││/                          /
     C.   ───┤│ /├───           D.   ────< / >────
             │/ ││                       /
            / └─┘                      /
*
240G-1-1.1 A 5-7   In a low-pass filter, signals whose|frequency is above the cut-off fre-|quency are attenuated by the filter
Which frequencies are attenuated by a low-pass filter?
A. Those above its cut-off frequency
B. Those within its cut-off frequency
C. Those within 50 kHz on either side of its cut-off frequency
D. Those below its cut-off frequency
*
241G-1-1.2 D 5-7   Low-pass means pass below
What circuit passes electrical energy below a certain frequency
and blocks electrical energy above that frequency?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
*
242G-1-2.1 C 5-8   Non-linearity in amplifiers create  |harmonics,  signals that are 2, 3,  |etc. times the desired output signal
Why does virtually every modern transmitter have a built-in
low-pass filter connected to its output?
A. To attenuate frequencies below its cutoff point
B. To attenuate low frequency interference to other amateurs
C. To attenuate excess harmonic radiation
D. To attenuate excess fundamental radiation
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243G-1-2.2 B 5-7   Since harmonics are above the desired |output signal, you can install a low- |pass at the transmitter to remove them
You believe that excess harmonic radiation from your transmitter
is causing interference to your television receiver.  What is one
possible solution for this problem?
A. Install a low-pass filter on the television receiver
B. Install a low-pass filter at the transmitter output
C. Install a high-pass filter on the transmitter output
D. Install a band-pass filter on the television receiver
*
244G-2-1.1 B 5-8   High-pass means pass above
What circuit passes electrical energy above a certain frequency
and attenuates electrical energy below that frequency?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
*
245G-2-2.1 A 5-8   Closest to the TV
Where is the proper place to install a high-pass filter?
A. At the antenna terminals of a television receiver
B. Between a transmitter and a Transmatch
C. Between a Transmatch and the transmission line
D. On a transmitting antenna
*
246G-2-2.2 B 5-8   Try a high-pass on the TV
Your Amateur Radio transmissions cause interference to your
television receiver even though you have installed a low-pass
filter at the transmitter output. What is one possible solution
for this problem?
A. Install a high-pass filter at the transmitter terminals
B. Install a high-pass filter at the television antenna terminals
C. Install a low-pass filter at the television antenna terminals
   also
D. Install a band-pass filter at the television antenna terminals
*
247G-3-1.1 A 5-8   A band-pass filter passes signals that|are within the passband of the filter |and rejects all signals above or below
What circuit attenuates electrical energy above a certain
 frequency and below a lower frequency?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
*
248G-3-1.2 D 5-8   A band-pass filter passes signals that|are within the passband of the filter |and rejects all signals above or below
What general range of RF energy does a band-pass filter reject?
A. All frequencies above a specified frequency
B. All frequencies below a specified frequency
C. All frequencies above the upper limit of the band in question
D. All frequencies above a specified frequency and below a lower
   specified frequency
*
249G-3-2.1 A 5-8   The IF has some Bandwidth, therefore|a band-pass filter would be the best|response
The IF stage of a communications receiver uses a filter
with a peak response at the intermediate frequency. What
term describes this filter response?
A. A band-pass filter
B. A high-pass filter
C. An input filter
D. A low-pass filter
*
250G-4-1.1 C 5-11  A detector is essential, the rest|are just nice additional features
What circuit is likely to be found in all types of receivers?
A. An audio filter
B. A beat frequency oscillator
C. A detector
D. An RF amplifier
*
251G-4-1.2 D 5-9   VFO, which is short for Variable|Frequency Oscillator, controlled|CW transmitter
What type of transmitter does this block diagram represent?
 ┌───────┬─────────────────┬───────────────────┐        ANTENNA
 │       │                 │                   │          ╙┬╜
 │  ┌────┴────┐     ┌──────┴──────┐     ┌──────┴──────┐    │
 │  │   VFO   ├────>│   DRIVER    ├────>│    POWER    ├─>──┘
 │  │         │     │             │     │  AMPLIFIER  │
 │  └─────────┘     └──────┬──────┘     └──────┬──────┘
 │                         │                   │
 │  ┌─────────┐            │  ┌─────────────┐  │
 └──┤  POWER  │            └──┤  TELEGRAPH  ├──┘
    │  SUPPLY │               │     KEY     │
    └─────────┘               └─────────────┘
A. A simple packet-radio transmitter
B. A simple crystal-controlled transmitter
C. A single-sideband transmitter
D. A VFO-controlled transmitter
*
252G-4-1.3 B 5-9   This block diagram represents a |crystal-controlled transmitter  |that is capable of A1A operation
What type of transmitter does this block diagram represent?
                                                        ANTENNA
                                                          ╙┬╜
 ┌────────────┐     ┌─────────────┐     ┌─────────────┐    │
 │  CRYSTAL   ├────>│   DRIVER    ├────>│    POWER    ├─>──┘
 │ OSCILLATOR │     │             │     │  AMPLIFIER  │
 └────────────┘     └──────┬──────┘     └──────┬──────┘
                           │                   │
                           │  ┌─────────────┐  │
                           └──┤  TELEGRAPH  ├──┘
                              │     KEY     │
                              └─────────────┘
A. A simple packet-radio transmitter
B. A simple crystal-controlled transmitter
C. A single-sideband transmitter
D. A VFO-controlled transmitter
*
253G-4-1.4 B 5-12  A detector converts the|IF signal to audio
What is the unlabeled block (?) in this diagram?
ANTENNA
  ╙┬╜
   │  ┌───────┐   ┌─────────┐   ┌───────┐   ┌─────────┐   ┌─┐/│
   └──┤ MIXER ├──>│   IF    ├──>│   ?   ├──>│  AUDIO  ├──>│ │ │
      │       │   │AMPLIFIER│   │       │   │AMPLIFIER│   └─┘\│
      └───┬───┘   └─────────┘   └───┬───┘   └─────────┘
       ┌──┴──┐                   ┌──┴──┐
       │ OSC │                   │ BFO │
       └─────┘                   └─────┘
A. An AGC circuit
B. A detector
C. A power supply
D. A VFO circuit
*
254G-4-1.5 D 5-9   A Wireless Telegraph using|emission type A1A, ie. CW
What type of device does this block diagram represent?
 ┌───────┬─────────────────┬───────────────────┐        ANTENNA
 │       │                 │                   │          ╙┬╜
 │  ┌────┴────┐     ┌──────┴──────┐     ┌──────┴──────┐    │
 │  │   VFO   ├────>│   DRIVER    ├────>│    POWER    ├─>──┘
 │  │         │     │             │     │  AMPLIFIER  │
 │  └─────────┘     └──────┬──────┘     └──────┬──────┘
 │                         │                   │
 │  ┌─────────┐            │  ┌─────────────┐  │
 └──┤  POWER  │            └──┤  TELEGRAPH  ├──┘
    │  SUPPLY │               │     KEY     │
    └─────────┘               └─────────────┘
A. A double-conversion receiver
B. A variable-frequency oscillator
C. A simple superheterodyne receiver
D. A simple CW transmitter
*
255G-4-2.1 D 5-12  Limiters will not work |in AM/SSB receivers, so|this must be an FM rcvr
What type of device does this block diagram represent?
 ╙┬╜ ANTENNA
  │  ┌─────────┐  ┌─────┐   ┌──────┐   ┌─────────┐   ┌───────┐
  └─>│   RF    ├─>│MIXER├──>│ WIDE ├──>│   IF    ├──>│LIMITER├─┐
     │AMPLIFIER│  │     │   │FILTER│   │AMPLIFIER│   │       │ │
     └─────────┘  └──┬──┘   └──────┘   └─────────┘   └───────┘ │
                     │      ┌─────────────<────────────────────┘
                     │      │                            SPEAKER
                  ┌──┴──┐   │  ┌─────────┐   ┌─────────┐   ┌─┐/│
                  │ OSC │   └─>│FREQUENCY├──>│  AUDIO  ├──>│ │ │
                  │     │      │  DISC.  │   │AMPLIFIER│   └─┘\│
                  └─────┘      └─────────┘   └─────────┘
A. A double-conversion receiver
B. A variable-frequency oscillator
C. A simple superheterodyne receiver
D. A simple FM receiver
*
256G-4-2.2 C 5-10  This is a phase modulated transmitter|The  unlabeled block is a reactance  |modulator as shown on page 7-9
What is the unlabeled block (?) in this diagram?
│\  ┌─────────┐   ┌───────┐   ┌───────┐   ┌───────┐   ┌──────────┐
│ ├─┤  AUDIO  ├──>│CLIPPER├─┐ │CRYSTAL├──>│   ?   ├──>│MULTIPLIER├─┐
│/  │AMPLIFIER│   │FILTER │ │ │  OSC. │   │       │   │          │ │
MIC └─────────┘   └───────┘ │ └───────┘   └───┬───┘   └──────────┘ │
                            └─────>───────────┘                    │
                                                                   │
                 ┌──────────────────────────────<──────────────────┘
                 │
                 │  ┌──────────┐   ┌──────────┐   ┌─────────┐   ╙┬╜
                 └─>│MULTIPLIER├──>│MULTIPLIER├──>│  POWER  ├────┘
                    │          │   │          │   │AMPLIFIER│ ANTENNA
                    └──────────┘   └──────────┘   └─────────┘
A. A band-pass filter
B. A crystal oscillator
C. A reactance modulator
D. A rectifier modulator
*
257H-1.1   A 5-9   Modulation is the process of varying|a carrier wave to convey information|(B is an example of demodulation)
What is the meaning of the term modulation?
A. The process of varying some characteristic of a carrier wave
   for the purpose of conveying information
B. The process of recovering audio information from a received
   signal
C. The process of increasing the average power of a single-
   sideband transmission
D. The process of suppressing the carrier in a single-sideband
   transmitter
*
258H-2-1.1 A 5-9   Since there would be no modulation, |an unmodulated carrier wave would be|the result
If the modulator circuit of your FM transmitter fails, what
 emission type would likely result?
A. An unmodulated carrier wave
B. An phase-modulated carrier wave
C. An amplitude-modulated carrier wave
D. A frequency-modulated carrier wave
*