This is the Multiple Choice Questions (MCQs) in Chapter 3: Measuring Devices 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. The force between two electrically charged objects is called:
- A. Electromagnetic deflection.
- B. Electrostatic force.
- C. Magnetic force.
- D. Electroscopic force.
2. The change in the direction of a compass needle, when a current-carrying wire is brought near, is:
- A. Electromagnetic deflection.
- B. Electrostatic force.
- C. Magnetic force.
- D. Electroscopic force.
3. Suppose a certain current in a galvanometer causes the needle to deflect 20 degrees, and then this current is doubled. The needle deflection:
- A. Will decrease.
- B. Will stay the same.
- C. Will increase.
- D. Will reverse direction.
4. One important advantage of an electrostatic meter is that:
- A. It measures very small currents.
- B. It will handle large currents.
- C. It can detect ac voltages.
- D. It draws a large current from the source.
5. A thermocouple:
- A. Gets warm when current flows through it.
- B. Is a thin, straight, special wire.
- C. Generates dc when exposed to light.
- D. Generates ac when heated.
6. One advantage of an electromagnet meter over a permanent-magnet meter is that:
- A. The electromagnet meter costs much less.
- B. The electromagnet meter need not be aligned with the earth’s magnetic field.
- C. The permanent-magnet meter has a more sluggish coil.
- D. The electromagnet meter is more rugged.
7. An ammeter shunt is useful because:
- A. It increases meter sensitivity.
- B. It makes a meter more physically rugged.
- C. It allows for measurement of a wide range of currents.
- D. It prevents overheating of the meter.
8. Voltmeters should generally have:
- A. Large internal resistance.
- B. Low internal resistance.
- C. Maximum possible sensitivity.
- D. Ability to withstand large currents.
9. To measure power-supply voltage being used by a circuit, a voltmeter
- A. Is placed in series with the circuit that works from the supply.
- B. Is placed between the negative pole of the supply and the circuit working from the supply.
- C. Is placed between the positive pole of the supply and the circuit working from the supply.
- D. Is placed in parallel with the circuit that works from the supply.
10. Which of the following will not cause a major error in an ohmmeter reading?
- A. A small voltage between points under test.
- B. A slight change in switchable internal resistance.
- C. A small change in the resistance to be measured.
- D. A slight error in range switch selection.
11. The ohmmeter in Fig. 3-17 shows a reading of about:
- A. 33,000 Ω.
- B. 3.3 KΩ.
- C. 330 Ω
- D. 33 Ω.
12. The main advantage of a FETVM over a conventional voltmeter is the fact that the FETVM:
- A. Can measure lower voltages.
- B. Draws less current from the circuit under test.
- C. Can withstand higher voltages safely.
- D. Is sensitive to ac as well as to dc.
13. Which of the following is not a function of a fuse?
- A. To be sure there is enough current available for an appliance to work right.
- B. To make it impossible to use appliances that are too large for a given circuit.
- C. To limit the amount of power that a circuit can deliver.
- D. To make sure the current is within safe limits.
14. A utility meter’s motor speed works directly from:
- A. The number of ampere hours being used at the time.
- B. The number of watt hours being used at the time.
- C. The number of watts being used at the time.
- D. The number of kilowatt hours being used at the time.
15. A utility meter’s readout indicates:
- A. Voltage.
- B. Power.
- C. Current.
- D. Energy.
16. A typical frequency counter:
- A. Has an analog readout.
- B. Is usually accurate to six digits or more.
- C. Works by indirectly measuring current.
- D. Works by indirectly measuring voltage.
17. A VU meter is never used for measurement of:
- A. Sound.
- B. Decibels.
- C. Power.
- D. Energy.
18. The meter movement in an illumination meter measures:
- A. Current.
- B. Voltage.
- C. Power.
- D. Energy.
19. An oscilloscope cannot be used to indicate:
- A. Frequency.
- B. Wave shape.
- C. Energy.
- D. Peak signal voltage.
20. The display in Fig. 3-18 could be caused by a voltage of:
- A. 6.0 V.
- B. 6.6 V.
- C. 7. 0V.
- D. No way to tell; the meter is malfunctioning.
Post a Comment