2A652 CDC Pretest Volume 2

56 Questions | Total Attempts: 93

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2a652 Quizzes & Trivia

Questions and Answers
  • 1. 
    Every atom must contain what types of particles?
    • A. 

      Electrons and protons

    • B. 

      Electrons and neutrons

    • C. 

      Protons and neutrons

    • D. 

      Electrons, protons, and neurons

  • 2. 
    An atom with eight electrons in its outermost shell is said to be
    • A. 

      Free

    • B. 

      Stable

    • C. 

      Valence

    • D. 

      Ionized

  • 3. 
    How many valence electrons are needed to make a good conductor?
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      6

  • 4. 
    "Dielectric" is the term used for
    • A. 

      Conductors

    • B. 

      Insulators

    • C. 

      Doped atoms

    • D. 

      Semi-conductors

  • 5. 
    "The flow or drift of electrons through a conductor" in the same direction at the same time is the definition of
    • A. 

      Conductivity

    • B. 

      Voltage

    • C. 

      Current

    • D. 

      Valance

  • 6. 
    The potential difference between two points in a circuit that exerts a force on free electons is called
    • A. 

      Conductivity

    • B. 

      Voltage

    • C. 

      Current

    • D. 

      Valence

  • 7. 
    What is used to control current flow in a circuit?
    • A. 

      Voltage

    • B. 

      Coulombs

    • C. 

      Resistance

    • D. 

      Conductivity

  • 8. 
    The relationship of voltage, current, and resistance is expressed through
    • A. 

      E,I, and C

    • B. 

      Power formulas

    • C. 

      Conductance

    • D. 

      Ohm's Law

  • 9. 
    Total current in a series circuit is equal to the
    • A. 

      Current through one component

    • B. 

      Sum of the current through each component

    • C. 

      Reciprocal of the current through each component

    • D. 

      Reciprocal of the sum of the currents through each component

  • 10. 
    What is the wattage of a circuit with 28 volts applied and a total resistance of .2 ohms?
    • A. 

      .14 watts (w)

    • B. 

      .14 kilowatts (kw)

    • C. 

      3.92 w

    • D. 

      3.92 kw

  • 11. 
    In a parallel circuit, the total voltage is equal to the
    • A. 

      Sum of the voltages across each branch

    • B. 

      Voltage across each resistor

    • C. 

      Voltage across each branch

    • D. 

      The reciprocal of the voltage across the resistances

  • 12. 
    Source current in a parallel circuit will be divided according to branch
    • A. 

      Voltage

    • B. 

      Powers

    • C. 

      Lengths

    • D. 

      Resistances

  • 13. 
    The areas around a magnet where its influence can be felt is the definition of the
    • A. 

      Saturation principle

    • B. 

      Magnetic theory

    • C. 

      Magnetic field

    • D. 

      Law of attraction and repulsion

  • 14. 
    "The ability of a material to pass lines of force" is a definition of
    • A. 

      Permeability

    • B. 

      Reluctance

    • C. 

      Electromagnetism

    • D. 

      Retentivity

  • 15. 
    The magnetism that remains after the magnetizing force has been removed is known as
    • A. 

      Electromagnetism

    • B. 

      Molecular magnetism

    • C. 

      Permeability

    • D. 

      Residual magnetism

  • 16. 
    The magnetic field of an electromagnet can be varied by changing the
    • A. 

      Type of core

    • B. 

      Number of turns in the coil

    • C. 

      Amount of current throught the coil

    • D. 

      All of the above

  • 17. 
    The electromechanical generation of a voltage requires a magnetic field, relative motion, and
    • A. 

      A complete circuit

    • B. 

      A conductor

    • C. 

      An insulator

    • D. 

      A load

  • 18. 
    The principle behind all electromechanical generation is
    • A. 

      Conduction

    • B. 

      Commutation

    • C. 

      Rectification

    • D. 

      Electromagnetic induction

  • 19. 
    The function of the commutator in a DC generator is to
    • A. 

      Complete the circuit to the load

    • B. 

      Induce DC into the external circuit

    • C. 

      Rectify the input

    • D. 

      Change AC voltage to DC voltage

  • 20. 
    Because an inductor stores energy and then returns it to the circuit, it is called a
    • A. 

      Resistive device

    • B. 

      Reactive device

    • C. 

      Retentive device

    • D. 

      Retroactive device

  • 21. 
    An inductor stores enegy in the form of
    • A. 

      Heat

    • B. 

      Resistance

    • C. 

      A magnetic field

    • D. 

      An electrostatic field

  • 22. 
    The process by which a current change in one coil produces a voltage in another coil is called
    • A. 

      Inductance

    • B. 

      Self-induction

    • C. 

      Mutual induction

    • D. 

      None of the above

  • 23. 
    A transformer will change all of the following except
    • A. 

      Power

    • B. 

      Current

    • C. 

      Voltage

    • D. 

      Resistance

  • 24. 
    Normally, the winding of a transformer that is connected to a power source is known as the
    • A. 

      Field winding

    • B. 

      Primary winding

    • C. 

      Current winding

    • D. 

      Secindary winding

  • 25. 
    What kind of turns of wire is found in the secondary windings of a step up transformer?
    • A. 

      Equal

    • B. 

      Less

    • C. 

      More

    • D. 

      All of the above

  • 26. 
    A relay is an electrically operated
    • A. 

      Meter

    • B. 

      Motor

    • C. 

      Switch

    • D. 

      Safety device

  • 27. 
    A relay that, once energized, requires a second coil to be energized before the contacts will return to their original positions is called a
    • A. 

      Locking relay

    • B. 

      Latching relay

    • C. 

      Timing relay

    • D. 

      Tripping relay

  • 28. 
    A capacitor stores energy in the form of
    • A. 

      Heat

    • B. 

      Resistance

    • C. 

      A magnetic field

    • D. 

      An electrostatic field

  • 29. 
    In a capacitor, the dielectric is the
    • A. 

      Positive lead

    • B. 

      Conductor

    • C. 

      Insulator

    • D. 

      Outer case

  • 30. 
    Opposition of a capacitor to AC is called
    • A. 

      Inductive reactance

    • B. 

      Impedance

    • C. 

      Capacitive reactance

    • D. 

      Capacitance

  • 31. 
    The factors which determine the time required to charge a capacitor are the capacitance and the
    • A. 

      Applied voltage

    • B. 

      Circuit current

    • C. 

      Amount of resistance

    • D. 

      Type of dielectric

  • 32. 
    The anode of a diode is constructed of
    • A. 

      Neutral material

    • B. 

      Biased material

    • C. 

      Positive material

    • D. 

      Negative material

  • 33. 
    Expanding or contracting the depletion region of a diode is called
    • A. 

      Basing

    • B. 

      Gating

    • C. 

      Spiking

    • D. 

      Biasing

  • 34. 
    A diode placed in a circuit in reverse bias is being used as
    • A. 

      A spike protector

    • B. 

      An amplifier

    • C. 

      A regulator

    • D. 

      A rectifier

  • 35. 
    A zener will conduct in reverse bias
    • A. 

      For a second or two at a time

    • B. 

      Until gate potential has been reached

    • C. 

      Once the avalanche point has been reached

    • D. 

      Until the breakdown point has been reached

  • 36. 
    A zener being used as a regulator must have a resistor placed in the circuit in
    • A. 

      Series

    • B. 

      Parallel

    • C. 

      Reverse bias

    • D. 

      Series-parallel

  • 37. 
    What is the approximate operating voltage of a LED?
    • A. 

      .5 volts

    • B. 

      .1 volt

    • C. 

      1.6 volts

    • D. 

      2.4 volts

  • 38. 
    The SCR has how many PN junctions?
    • A. 

      One

    • B. 

      Two

    • C. 

      Three

    • D. 

      Four

  • 39. 
    The amount of current required to gate an SCR is called
    • A. 

      Forward breakover voltage

    • B. 

      Holding current

    • C. 

      Peak voltage

    • D. 

      Gate current

  • 40. 
    In order for an SCR to be turned off
    • A. 

      The forward breakover voltage must exceed the holding voltage

    • B. 

      The current must drop below the holding current

    • C. 

      The negative amp switch must activate

    • D. 

      The negative volt switch must activate

  • 41. 
    The best method of troubleshooting is the
    • A. 

      Systematic method

    • B. 

      Instantaneous method

    • C. 

      Hit-and-miss method

    • D. 

      Trial-and-error method

  • 42. 
    Which troubleshooting step is done by knowing proper equipment operation?
    • A. 

      Analysis

    • B. 

      Recognition

    • C. 

      Repair and check

    • D. 

      Elimination and isolation

  • 43. 
    During which troubleshooting step do you try to determine which system could cause the malfunction?
    • A. 

      Analysis

    • B. 

      Verification

    • C. 

      Recognition

    • D. 

      Elimination and isolation

  • 44. 
    During which troubleshooting step do you first use the schematic diagram?
    • A. 

      Recognition

    • B. 

      Verification

    • C. 

      Analysis

    • D. 

      Isolation

  • 45. 
    Which troubleshooting aid is designed to aid you if you see an unfamiliar symbol?
    • A. 

      Zones

    • B. 

      Schematic

    • C. 

      Wiring diagram

    • D. 

      Reference designation index

  • 46. 
    Which troubleshooting aid is designed to aid you in finding components on a diagram?
    • A. 

      Zones

    • B. 

      Schematic

    • C. 

      Wiring diagram

    • D. 

      Reference designation index

  • 47. 
    When used in a series circuit to measure voltage, how is a multimeter connected in the circuit?
    • A. 

      In series

    • B. 

      To ground

    • C. 

      In parallel

    • D. 

      In series-parallel

  • 48. 
    To set a value to the height of the oscilloscope grid markings, you adjust the
    • A. 

      Focus

    • B. 

      Pitch control

    • C. 

      Voltage selector

    • D. 

      Time sweep selector

  • 49. 
    To ensusre accuracy of an oscilloscope when preparing for operation you should always,
    • A. 

      Zero the display

    • B. 

      Center the display

    • C. 

      Identify the cal point and adjust to zero

    • D. 

      Identify the cal point and calibrate the display

  • 50. 
    How can you identify an electrostatic sensitive device?
    • A. 

      The package will have special coloring as specified in local directives

    • B. 

      The package will have a special control number as specified in local directives

    • C. 

      It will be marked with the MIL-STD-129 symbol or caution marking

    • D. 

      It will be marked with the MIL-SPC-235 symbol or warning marking

  • 51. 
    A heat sink is used in soldering to
    • A. 

      Prevent heat from damaging the component being soldered

    • B. 

      Prevent heat from damaging other components in the circuit

    • C. 

      Apply heat to the component being soldered

    • D. 

      Apply heat to other components in the circuit

  • 52. 
    A pitted or worn soldering iron tip should be redressed with a flat, fine, single-cut file and should be
    • A. 

      Tinned

    • B. 

      Clean of solder

    • C. 

      Replaced

    • D. 

      Checked for length

  • 53. 
    The first step in soldering a conductor is to
    • A. 

      Wick the wire

    • B. 

      Remove the insulation

    • C. 

      Apply heat to the connection

    • D. 

      Apply solder to the connection

  • 54. 
    When soldering flat perforated terminals, the conductor is connected to the terminal using a
    • A. 

      90 degree wrap

    • B. 

      180 degree wrap

    • C. 

      270 degree wrap

    • D. 

      360 degree wrap

  • 55. 
    A wire is inserted into a solder cup until the
    • A. 

      Wire touches the bottom

    • B. 

      Wire clears the top of the cup

    • C. 

      Insulation touches the cup

    • D. 

      Wire protrudes from the weep hole

  • 56. 
    The best method of repairing a lifted circuit track on a PCB is to
    • A. 

      Bond it

    • B. 

      Glue it

    • C. 

      Replace it with bare wire

    • D. 

      Replace it with insulated wire