Resistors – Gibilisco MCQs in Electronics

Multiple choice questions in Resistors

This is the Multiple Choice Questions (MCQs) in Chapter 6: Resistors from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

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1. Biasing in an amplifier circuit:

  • A. Keeps it from oscillating.
  • B. Matches it to other amplifier stages in a chain.
  • C. Can be done using voltage dividers.
  • D. Maximizes current flow.

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

  • A. Current-limiting resistors.
  • B. Bleeder resistors.
  • C. Maximizing the driving power.
  • D. Shorting out the power supply when the circuit is off.

3. Bleeder resistors:

  • A. Are connected across the capacitor in a power supply.
  • B. Keep a transistor from drawing too much current.
  • C. Prevent an amplifier from being overdriven.
  • D. Optimize the efficiency of an amplifier.

4. Carbon-composition resistors:

  • A. Can handle lots of power.
  • B. Have capacitance or inductance along with resistance.
  • C. Are comparatively nonreactive.
  • D. Work better for ac than for dc.

5. The best place to use a wirewound resistor is:

  • A. In a radio-frequency amplifier.
  • B. When the resistor doesn’t dissipate much power.
  • C. In a high-power, radio-frequency circuit.
  • D. In a high-power, direct-current circuit.

6. A metal-film resistor:

  • A. Is made using solid carbon/phenolic paste.
  • B. Has less reactance than a wirewound type.
  • C. Can dissipate large amounts of power.
  • D. Has considerable inductance.

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

  • A. A set of switchable, fixed resistors.
  • B. A linear-taper potentiometer.
  • C. A logarithmic-taper potentiometer.
  • D. A wirewound resistor.

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

  • A. A set of switchable, fixed resistors.
  • B. A linear-taper potentiometer.
  • C. A logarithmic-taper potentiometer.
  • D. A wirewound resistor.

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

  • 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 W, what is the final sound power?

  • A. 13 W.
  • B. 77 mW.
  • C. 50 mW.
  • D. There is not enough information to tell.

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?

  • A. 50.
  • B. 169.
  • C. 5,000.
  • D. 100,000.

12. An advantage of a rheostat over a potentiometer is 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:

  • A. 7.4 percent.
  • B. 7.9 percent.
  • C. 5 percent.
  • D. 10 percent.

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

  • A. 2,970 and 3,630 Ω 
  • B. 3,295 and 3,305 Ω.
  • C. 3,135 and 3,465 Ω.
  • D. 2.8 KΩ and 3.8 KΩ.

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.
  • B. 53.0 Ω.
  • C. 59.7 Ω.
  • D. 61.1 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.
  • B. 1/2 W.
  • C. I W.
  • D. 2 W.

17. Suppose a 1-K Ω 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:

  • A. Four 1 K Ω, 1-W resistors in series-parallel.
  • B. Two 2.2 K Ω 1-W resistors in parallel.
  • C. Three 3.3 K Ω, 1-W resistors in parallel.
  • D. One 1 K Ω, 1-W resistor, since manufacturers allow for a 10-percent margin of safety.

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

  • A. 22 Ω.
  • B. 220 Ω.
  • C. 2.2 K Ω.
  • D. 22 K Ω.

19. The actual resistance of the above unit can be expected to vary by how much above or below the specified value?

  • A. 11 Ω.
  • B. 110 Ω.
  • C. 22 Ω.
  • D. 220 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 K Ω to 980 K Ω.
  • B. 740 K Ω to 900 K Ω.
  • C. 7.4 K Ω to 9.0 K Ω.
  • D. The manufacturer does not make any claim.

Complete List of Multiple Choice Questions from this Book

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