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.
Start Practice Exam Test Questions
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.
Post a Comment