Gibilisco - Resistors

20 Domande | Total Attempts: 612

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Gibilisco - Resistors

Questions and Answers
  • 1. 
    Proper biasing in an amplifier circuit
    • A. 

      Causes it to oscillate.

    • B. 

      Prevents an impedance match.

    • C. 

      Can be obtained using a voltage divider network.

    • D. 

      Maximizes current flow.

  • 2. 
    A transistor can be protected from needless overheating by
    • A. 

      A current-limiting resistor.

    • B. 

      Bleeder resistors.

    • C. 

      Maximizing the drive.

    • D. 

      Shorting out the power supply when the circuit is off.

  • 3. 
    A bleeder resistor
    • A. 

      Is connected across the capacitor in a power supply.

    • B. 

      Keeps a transistor from drawing too much current.

    • C. 

      Prevents an amplifier from being overdriven.

    • D. 

      Optimizes the efficiency of an amplifier.

  • 4. 
    Carbon-composition resistors
    • A. 

      Can handle gigantic levels of power.

    • B. 

      Have capacitance or inductance along with resistance.

    • C. 

      Have essentially no capacitance or inductance.

    • D. 

      Work better for ac than for dc.

  • 5. 
    A logical place for a wirewound resistor is
    • A. 

      In a radio-frequency amplifier.

    • B. 

      In a circuit where a noninductive resistor is called for.

    • C. 

      In a low-power radio-frequency circuit.

    • D. 

      In a high-power dc circuit.

  • 6. 
    A metal-film resistor
    • A. 

      Is made using a carbon-based paste.

    • B. 

      Does not have much inductance.

    • C. 

      Can dissipate large amounts of power.

    • D. 

      Has considerable inductance.

  • 7. 
    What type of resistor, or combination of resistors, would you use as the meter-sensitivitycontrol in a test instrument, when continuous adjustment is desired?
    • A. 

      A set of switchable, fixed resistors

    • B. 

      A linear-taper potentiometer

    • C. 

      An audio-taper potentiometer

    • D. 

      A wirewound resistor

  • 8. 
    What type of resistor, or combination of resistors, would you use as the volume control in astereo compact-disc (CD) player?
    • A. 

      A set of switchable, fixed resistors

    • B. 

      A linear-taper potentiometer

    • C. 

      An audio-taper potentiometer

    • D. 

      A wirewound resistor

  • 9. 
    If a sound triples in actual power level, approximately what is this, expressed in decibels?
    • A. 

      +3 dB

    • B. 

      +5 dB

    • C. 

      +6 dB

    • D. 

      +9 dB

  • 10. 
    Suppose a sound changes in volume by −13 dB. If the original sound power is 1.0 W, what isthe final sound power?
    • A. 

      13 W

    • B. 

      77 mW

    • C. 

      50 mW

    • D. 

      There is not enough information given here to answer this question.

  • 11. 
    The sound from a portable radio is at a level of 50 dB. How many times the threshold ofhearing is this, in terms of actual sound power?
    • A. 

      50

    • B. 

      169

    • C. 

      5000

    • D. 

      100,000

  • 12. 
    An advantage of a rheostat over a potentiometer is the fact that
    • A. 

      A rheostat can handle higher frequencies.

    • B. 

      A rheostat is more precise.

    • C. 

      A rheostat can handle more current.

    • D. 

      A rheostat works better with dc.

  • 13. 
    A resistor is specified as having a value of 68 Ω, but is measured with an ohmmeter as 63 Ω.The value is off by which of the following percentages?
    • A. 

      7.4%

    • B. 

      7.9%

    • C. 

      5%

    • D. 

      10%

  • 14. 
    Suppose a resistor is rated at 3.3 kΩ 5%. This means it can be expected to have a valuebetween
    • A. 

      2970 Ω and 3630 Ω.

    • B. 

      3295 Ω and 3305 Ω.

    • C. 

      3135 Ω and 3465 Ω.

    • D. 

      2.8 kΩ and 3.8 kΩ.

  • 15. 
    A package of resistors is rated at 56 Ω 10%. You test them with an ohmmeter. Which ofthe following values indicates a reject?
    • A. 

      50.0 Ω

    • B. 

      53.0 Ω

    • C. 

      59.7 Ω

    • D. 

      61.1 Ω

  • 16. 
    A resistor has a value of 680 Ω, and you expect that it will have to draw 1 mA maximumcontinuous current in a circuit you’re building. What power rating is good for this application,but not needlessly high?
    • A. 

      1⁄4 W

    • B. 

      1⁄2 W

    • C. 

      1 W

    • D. 

      2 W

  • 17. 
    Suppose a 1-kΩ resistor will dissipate 1.05 W, and you have a good supply of 1-W resistors ofvarious ohmic values. If there’s room for 20 percent resistance error, the cheapest solution is to use
    • A. 

      Four 1-kΩ, 1-W resistors in series-parallel.

    • B. 

      A pair of 2.2-kΩ, 1-W resistors in parallel.

    • C. 

      A set of three 3.3-kΩ, 1-W resistors in parallel.

    • D. 

      A single 1-kΩ, 1-W resistor, because all manufacturers allow for a 10 percent margin of safety when rating resistors for their power-handling capability.

  • 18. 
    Suppose a carbon-composition resistor has the following colored bands on it: red, red, red,gold. This indicates a resistance of
    • A. 

      22 Ω.

    • B. 

      220 Ω.

    • C. 

      2.2 kΩ.

    • D. 

      22 kΩ.

  • 19. 
    The actual resistance of the component described in the previous question can be expected tovary above or below the specified ohmic value by up to what amount?
    • A. 

      11 Ω

    • B. 

      110 Ω

    • C. 

      22 Ω

    • D. 

      220 Ω

  • 20. 
    Suppose a carbon-composition resistor has the following colored bands on it: gray, red,yellow. This unit can be expected to have a value within approximately what range?
    • A. 

      660 kΩ to 980 kΩ

    • B. 

      740 kΩ to 900 kΩ

    • C. 

      7.4 kΩ to 9.0 kΩ

    • D. 

      The manufacturer does not make any claim.

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