HAM Radio 3.2/Ham Radio Version 3.2 (Chestnut CD-ROMs)(1993).ISO/exam/techexam/pool3af

Text File | 1991-07-06 | 13KB | 438 lines

         FCC Technician Exam Question Pool - Subelement 3AF
              (Valid 7/1/90 thru 10/31/92)


               CIRCUIT COMPONENTS (2 Exam questions)


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3F-1-1.1   B
What are the four common types of resistor construction?

 A. Carbon-film, metal-film, micro-film and wire-film.
 B. Carbon-composition, carbon film, metal-film and wire-wound.
 C. Carbon-composition, carbon-film, electrolytic and metal-film.
 D. Carbon-film, ferrite, carbon-composition and metal-film.


3F-1-2.1   D
What is the primary function of a Resistor?

 A. To store an electric charge.
 B. To store a magnetic field.
 C. To match a high impedance source to a low impedance load.
 D. To limit the current in an electric circuit.


3F-1-2.2   C
What is a VARIABLE RESISTOR?

 A. A Resistor that changes value when
    an AC voltage is applied to it.
 B. A device that can transform a variable
    voltage into a constant voltage.
 C. A Resistor with a slide contact that
    makes the resistance adjustable.
 D. A Resistor that changes value when it is heated.


3F-1-3.1   A
What do the first three color bands on a resistor indicate?

 A. The value of the resistor in Ohms.
 B. The resistance tolerance in Percent.
 C. The power rating in Watts.
 D. The value of the resistor in Henrys.


3F-1-3.2   B
How can a carbon resistor's electrical
tolerance rating be found?

 A. By using a wavemeter.
 B. By using the resistor's color code.
 C. By using Thevenin's theorem for resistors.
 D. By using the Baudot code.


3F-1-3.3   B
What does the forth color band on a resistor indicate?

 A. The value of the resistor in Ohms.
 B. The resistance tolerance in Percent.
 C. The power rating in Watts.
 D. The resistor composition.


3F-1-3.4   C
When the color bands on a group of resistors indicate that
that they all have the same resistance, what further
information about each resistor is needed in order to select
those that have nearly equal value?

 A. The working voltage rating of each resistor.
 B. The composition of each resistor.
 C. The tolerance of each resistor.
 D. The current rating of each resistor.


3F-1-4.1   A
Why do Resistors generate heat?

 A. They convert electrical energy into heat energy.
 B. They exhibit reactance.
 C. Because of skin effect.
 D. To produce thermionic emission.


3F-1-4.2   C
Why would a large size resistor be substituted
for a smaller one of the same resistance?

 A. To obtain better response.
 B. To obtain a higher current gain.
 C. To increase power dissipation capability.
 D. To produce a greater parallel impedance.


3F-1-5.1   B
What is the symbol used to represent a fixed resistor
on schematic diagrams?  (A word description of the symbol
for each choice is given.  The symbol must be drawn in.)

 A. Symbol for an inductor.
 B. Symbol for a resistor.
 C. Symbol for a polarized capacitor.
 D. Symbol for a dual zener diode.

3F-1-5.2   C
What is the symbol used to represent a variable resistor
on schematic diagrams?  (A word description of the symbol
for each choice is given.  The symbol must be drawn in.)

 A. Symbol for a variable inductor.
 B. Symbol for a variable capacitor.
 C. Symbol for a variable resistor.
 D. Symbol for a tapped resistor.


3F-2-1.1   D
What is an inductor core?
 A. The point at which an inductor is tapped to
    produce resonance.
 B. A tight coil of wire used in a transformer.
 C. An insulating material placed between the plates
    of an inductor.
 D. The central portion of a coil; may be made of from
    air, iron, brass or other material.


3f-2-1.2   A
What are the component parts of a coil?

 A. The wire in the winding and the core.
 B. Two conductive plates and an insulating material.
 C. Two or more layers of silicon material.
 D. A donut-shaped iron core and a layer of insulating tape.


3F-2.1.3   D
Describe an INDUCTOR.

 A. A semiconductor in a conducting shield.
 B. Two parallel conducting plates.
 C. A straight wire conductor mounted inside a Faraday shield.
 D. A coil of conducting wire.


3F-2-1.4   C
For radio frequency power applications, which
type of Inductor has the least amount of loss?

 A. Magnetic wire.
 B. Iron core.
 C. Air core.
 D. Slug tuned.


3F-2-2.1   D
What is an INDUCTOR?

 A. An electronic component that stores
    energy in an electric field.
 B. An electronic component that converts
    a high voltage to a lower voltage.
 C. An electronic component that opposes
    DC while allowing AC to pass.
 D. An electronic component that stores
    energy in a magnetic field.


3F-2-2.2   C
What are the electrical properties of an Inductor.

 A. An Inductor stores a charge electrostatically,
    and opposes a change in voltage.
 B. An Inductor stores a charge electrochemically,
    and opposes a change in current.
 C. An Inductor stores a charge electromagnetically,
    and opposes a change in current.
 D. An Inductor stores a charge electromechanically,
    and opposes a change in voltage.


3F-2-3.1   D
What factors determine the amount of Inductance in a coil?

 A. The type of material used in the core,
    the diameter of the core, and whether the
    coil is mounted horizontal or vertical.
 B. The diameter of the core, the number of
    of turns of wire used to wind the
    coil and the type of metal used in the wire.
 C. The type of material used in the core, the
    number of turns used to wind the core, and
    the frequency of the current through the coil.
 D. The type of material used in the core, the
    diameter of the core, the length of the coil,
    and the number of turns of wire used to wind the coil.


3F-2-3.2   B
What can be done to raise the inductance of a
5 Microhenry Air Core coil to a 5 Milihenry coil
with the same physical dimensions.

 A. The coil can be wound on a non-conducting tube.
 B. The coil can be wound on an iron core.
 C. Both ends of the coil must be brought around to form the
    shape of a doughnut, or toroid.
 D. The coil must be made of a heavier-gauge wire.



3F-2-3.3   A
As an Iron core is inserted in a coil,
what happens to its inductance?

 A. It increases.
 B. It decreases.
 C. It stays the same.
 D. It becomes voltage-dependent.


3F-2-3.4   B
As a Brass core is inserted in a coil,
what happens to its inductance?

 A. It increases.
 B. It decreases.
 C. It stays the same.
 D. It becomes voltage-dependent.


3F-2-4.1  A
What is the symbol used to represent an adjustable inductor
on schematic diagrams?  (A word description of the symbol
for each choice is given.  The symbol must be drawn in.)

 A. Symbol for a variable inductor.
 B. Symbol for a variable capacitor.
 C. Symbol for a variable resistor.
 D. Symbol for a tapped resistor.


3F-2-4.2   B
What is the symbol used to represent an iron-core inductor
on schematic diagrams?  (A word description of the symbol
for each choice is given.  The symbol must be drawn in.)

 A. Symbol for a fixed resistor with two parallel solid
    lines alongside.
 B. Symbol for an inductor with two parallel solid lines
    alongside.
 C. Symbol showing rectangular box with two leads and
    two parallel solid lines along side.
 D. Symbol for a fuse with two parallel solid lines
    along side.



3F-2-4.3   C
What is the symbol used to represent an inductor wound
over a toroidal core on schematic diagrams?  (A word
description of the symbol for each choice is given.
The symbol must be drawn in.)

 A. Symbol for toroidal inductor.
 B. Made up Symbol.
 C. Symbol for an iron-core inductor.
 D. Symbol for a fuse with two parallel solid lines
    along side.


3F-3-1.1   D
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 he plates are mounted on.
 D. The insulating material between the plates.


3F-3-1.2   A
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.



3F-3-1.3   C
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.


3F-3-1.4   C
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 plate through electrochemical action.


3F-3-2.1   B
What is a CAPACITOR.

 A. An electronic component that stores
    energy in an 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.


3F-3-2.2   D
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.


3F-3-2.3   A
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.


3F-3-2.4   B
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 Milihenrys and Amperes.


3F-3-3.1   A
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 material is N type or P type.
 D. The dielectric constant of the material between the plates,
    the area of one side of one plate, the number of plates
    and the type of material used for the protective coating.


3F-3-3.2   B
As the plate area of a capacitor increases,
what happens to its capacitance?

 A. Decreases.
 B. Increases.
 C. Stays the same.
 D. Becomes voltage dependent.


3F-3-3.3   D
As the plate spacing of a capacitor increases,
what happens to its capacitance?

 A. Increases.
 B. Stays the same.
 C. Becomes voltage dependent.
 D. Decreases.


3F-3-4.1   D
What is the symbol used to represent an electrolytic
capacitor on schematic diagrams?  (A word
description of the symbol for each choice is given.
The symbol must be drawn in.)

 A. Symbol for a fuse but with a positive polarity (plus)
    sign on one end.
 B. Symbol for a crystal but with a positive polarity
    sign on one end.
 C. Symbol for a single cell battery with both
    polarities correctly shown (plus and minus signs).
 D. Symbol for an electrolytic capacitor.


3F-3-4.2   A
What is the symbol used to represent a variable capacitor
on schematic diagrams?  (A word description of the symbol
for each choice is given.  The symbol must be drawn in.)

 A. Symbol for a variable capacitor.
 B. Symbol single cell battery with polarity signs but also with an
    arrow thru the symbol appearing to indicate "variable.
 C. Symbol for a crystal but also with an
    arrow thru the symbol appearing to indicate "variable.
 D. Made up Symbol with an arrow thru the symbol
    appearing to indicate "variable.



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