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GIBILISCO CHAP 6

GIBILISCO CHAP 6
20問 • 2年前
  • Czy Gamat
    • 通報

    問題一覧

  • 1

    Biasing in an amplifier circuit:

    C. Can be done using voltage dividers.

  • 2

    A transistor can be protected from needless overheating by:

    A. Current-limiting resistors

  • 3

    Bleeder resistors:

    A. Are connected across the capacitor in a power supply.

  • 4

    Carbon-composition resistors:

    C. Are comparatively nonreactive.

  • 5

    The best place to use a wirewound resistor is:

    D. In a high-power, direct-current circuit

  • 6

    A metal-film resistor:

    B. Has less reactance than a wirewound type.

  • 7

    A meter-sensitivity control in a test instrument would probably be:

    B. A linear-taper potentiometer.

  • 8

    A volume control in a stereo compact-disc player would probably be:

    C. A logarithmic-taper potentiometer.

  • 9

    If a sound triples in actual power level, approximately what is the decibel increase?

    B. 5 dB.

  • 10

    Suppose a sound changes in volume by 13 dB. If the original sound power is 1 W, what is the final sound power?

    C. 50 mW.

  • 11

    The sound from a transistor radio is at a level of 50 dB. How many times the threshold of hearing is this, in terms of actual sound power?

    D. 100,000.

  • 12

    An advantage of a rheostat over a potentiometer is that:

    C. A rheostat can handle more current.

  • 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:

    A. 7.4 percent.

  • 14

    Suppose a resistor is rated at 3.3 KΩ, plus or minus 5 percent. This means it can be expected to have a value between:

    C. 3,135 and 3,465 Ω.

  • 15

    A package of resistors is rated at 56 Ω, plus or minus 10 percent. You test them with an ohmmeter. Which of the following values indicates a reject?

    A. 50.0 Ω.

  • 16

    A resistor has a value of 680 Ω, and you expect it will have to draw 1 mA maximum continuous current. What power rating is best for this application?

    A. 1/4 W.

  • 17

    Suppose a 1-KΩ resistor will dissipate 1.05 W, and you have many 1-W resistors of all common values. If there’s room for 20-percent resistance error, the cheapest solution is to use:

    B. Two 2.2 KΩ, 1-W resistors in parallel.

  • 18

    Red, red, red, gold indicates a resistance of:

    C. 2.2 KΩ

  • 19

    The actual resistance of 2.2k ohms can be expected to vary by how much above or below the specified value?

    B. 110 Ω.

  • 20

    A resistor has three bands: gray, red, yellow. This unit can be expected to have a value within approximately what range?

    A. 660 KΩ to 980 KΩ.

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    問題一覧

  • 1

    Biasing in an amplifier circuit:

    C. Can be done using voltage dividers.

  • 2

    A transistor can be protected from needless overheating by:

    A. Current-limiting resistors

  • 3

    Bleeder resistors:

    A. Are connected across the capacitor in a power supply.

  • 4

    Carbon-composition resistors:

    C. Are comparatively nonreactive.

  • 5

    The best place to use a wirewound resistor is:

    D. In a high-power, direct-current circuit

  • 6

    A metal-film resistor:

    B. Has less reactance than a wirewound type.

  • 7

    A meter-sensitivity control in a test instrument would probably be:

    B. A linear-taper potentiometer.

  • 8

    A volume control in a stereo compact-disc player would probably be:

    C. A logarithmic-taper potentiometer.

  • 9

    If a sound triples in actual power level, approximately what is the decibel increase?

    B. 5 dB.

  • 10

    Suppose a sound changes in volume by 13 dB. If the original sound power is 1 W, what is the final sound power?

    C. 50 mW.

  • 11

    The sound from a transistor radio is at a level of 50 dB. How many times the threshold of hearing is this, in terms of actual sound power?

    D. 100,000.

  • 12

    An advantage of a rheostat over a potentiometer is that:

    C. A rheostat can handle more current.

  • 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:

    A. 7.4 percent.

  • 14

    Suppose a resistor is rated at 3.3 KΩ, plus or minus 5 percent. This means it can be expected to have a value between:

    C. 3,135 and 3,465 Ω.

  • 15

    A package of resistors is rated at 56 Ω, plus or minus 10 percent. You test them with an ohmmeter. Which of the following values indicates a reject?

    A. 50.0 Ω.

  • 16

    A resistor has a value of 680 Ω, and you expect it will have to draw 1 mA maximum continuous current. What power rating is best for this application?

    A. 1/4 W.

  • 17

    Suppose a 1-KΩ resistor will dissipate 1.05 W, and you have many 1-W resistors of all common values. If there’s room for 20-percent resistance error, the cheapest solution is to use:

    B. Two 2.2 KΩ, 1-W resistors in parallel.

  • 18

    Red, red, red, gold indicates a resistance of:

    C. 2.2 KΩ

  • 19

    The actual resistance of 2.2k ohms can be expected to vary by how much above or below the specified value?

    B. 110 Ω.

  • 20

    A resistor has three bands: gray, red, yellow. This unit can be expected to have a value within approximately what range?

    A. 660 KΩ to 980 KΩ.