In this article, you will find the electrical and electronics circuit measurement objective questions and answers to test your knowledge.
Circuit Measurement Objective Questions
The below list provides all the multiple-choice questions (MCQ) related to the circuit measurement.
Answers are available at the bottom of the article.
1. Which of the following configurations extends the range of a voltmeter?
| A) | A capacitor in series with the meter movement |
| B) | A capacitor in parallel with the meter movement |
| C) | A resistor in series with the meter movement |
| D) | A resistor in parallel with the meter movement |
2. The d’Arsonval meter movement is based on which of the following principles?
| A) | Moving vane |
| B) | Permanent-magnet moving-coil |
| C) | Electrostatic |
| D) | Electrodynamic |
3. What value of ac is indicated by a meter scale?
| A) | Peak-to-peak |
| B) | Peak |
| C) | Average |
| D) | Effective |
4. Which of the following electrical quantities is measured by a wattmeter?
| A) | Energy |
| B) | Current |
| C) | Voltage |
| D) | Power |
5. What electrical property is measured with an ohmmeter?
| A) | Current |
| B) | Resistance |
| C) | Voltage |
| D) | Power |
6. Which of the following electrical quantities is measured by a watt-hour meter?
| A) | Energy |
| B) | Power |
| C) | Current |
| D) | Voltage |
7. A voltmeter should be connected in an electrical circuit in what manner?
| A) | In series-parallel with the load |
| B) | In parallel with the load |
| C) | In accordance with Lenz’s Law |
| D) | In series with the load |
8. The hair-springs in a d’Arsonval meter movement perform which of the following functions?
| A) | They aid the movement of the pointer when there is current through the meter |
| B) | They keep the pointer in the position of the last indication when the current is removed |
| C) | They make electrical connections to the meter movement |
| D) | All of these answers |
9. What is meant by the term “meter damping”?
| A) | Moistening the felt pads |
| B) | Compensating for electromagnetic induced interference |
| C) | Preventing excessive current through the coil |
| D) | Smoothing the oscillations of the pointer |
10. How should an ohmmeter be connected in an electrical circuit?
| A) | In parallel with the source |
| B) | In series-parallel with the load |
| C) | In parallel with the load |
| D) | In series with the load |
11. What portion of the ammeter scale should be used to take a final reading?
| A) | The lower half |
| B) | The upper half |
| C) | Anywhere on the meter face |
| D) | The mid-scale portion |
12. Which of the following meter movements will measure either ac or dc without the use of a rectifier?
| A) | d’Arsonval |
| B) | Electrodynamic |
| C) | Electrostatic |
| D) | GMS |
13. Which of the following safety precautions should be observed when a megger is used?
| A) | Always start with the highest scale selection of the meter |
| B) | Do not use a dc megger to measure circuits that are powered by ac |
| C) | Do not touch the meter leads when a measurement is being taken |
| D) | All of these answers |
14. Out-of-circuit meters have which of the following advantages over in-circuit meters?
| A) | They are lighter weight |
| B) | They can be used on more than one device |
| C) | All of these answers |
| D) | They are more rugged |
15. What area of an ohmmeter scale should be used when a measurement is taken?
| A) | Lower half |
| B) | Mid-scale portion |
| C) | Upper half |
| D) | Anywhere on the meter face |
16. Why is there a mirror on the face of a multimeter?
| A) | To aid in reducing parallax error |
| B) | To illuminate the meter face |
| C) | To compensate for the difference in ac and dc measurements |
| D) | To reduce the friction between the pointer and the meter face |
17. If the mirror on the face of a multimeter is used properly, where will the image of the pointer appear?
| A) | Barely visible on either side of the pointer |
| B) | Clearly visible to the left of the pointer |
| C) | Hidden behind the pointer |
| D) | Clearly visible to the right of the pointer |
18. When the current in a conductor is measured without the conductor being disconnected, which of the following meters could be used?
| A) | Transformer voltmeter |
| B) | Multimeter |
| C) | Hook-on voltameter |
| D) | Induction wattmeter |
19. Circuit measurement is used for which of the following purposes?
| A) | To increase the power used in a circuit |
| B) | To discover the length and width of a circuit |
| C) | To find the weight of a circuit |
| D) | To determine the reason a circuit is not functioning properly |
20. Which of the following safety precautions does NOT apply to a multimeter?
| A) | Never apply power to the circuit when measuring voltage with the meter |
| B) | Be sure the meter is switched to ac for ac measurements |
| C) | Deenergize the circuit before connecting the meter |
| D) | Observe proper dc polarity when measuring dc |
21. What electrical property is measured by an ammeter?
| A) | Voltage |
| B) | Power |
| C) | Resistance |
| D) | Current |
22. Electrostatic meter movements are used to measure which of the following current/voltage values?
| A) | Low current |
| B) | Low voltage |
| C) | High current |
| D) | High voltage |
23. Which of the following methods is used to dampen a meter?
| A) | Incorporate an airtight chamber containing a van |
| B) | Install a fuse in one of the input leads |
| C) | Provide a fluid reservoir and sponge arrangement next to the pads |
| D) | Mount the meter in a mu-metal case |
24. The electrostatic meter movement reacts to which of the following electrical properties?
| A) | Power |
| B) | Current |
| C) | Voltage |
| D) | Resistance |
25. An ohmmeter is used to check for which of the following conditions?
| A) | Overheating |
| B) | Undercurrent |
| C) | Continuity |
| D) | Overcurrent |
26. Which of the following safety precautions should be observed prior to connecting an ammeter into a circuit?
| A) | All of these answers |
| B) | Switch to the highest range |
| C) | Deenergize the circuit |
| D) | Observe proper dc polarity |
27. Which of the following safety precautions should be observed when a voltmeter is used?
| A) | Connect the meter in series with the circuit |
| B) | All of these answers |
| C) | Start with the lowest range of the meter |
| D) | Deenergize the circuit before connecting the meter |
28. Which of the following safety precautions should be observed when an ohmmeter is used?
| A) | Deenergize the circuit before connecting the meter |
| B) | All of these answers |
| C) | Always start with the highest scale of the meter |
| D) | Observe proper polarity |
29. The ammeter with the greatest sensitivity has which of the following characteristics?
| A) | A high ratio of internal resistance to full-scale deflection indication |
| B) | The lowest amount of current for full-scale deflection indication |
| C) | The highest amount of current for full-scale deflection indication |
| D) | A low ratio of internal resistance to full-scale deflection indication |
30. A multimeter can be used to measure which of the following electrical properties?
| A) | Resistance |
| B) | all of these answers |
| C) | Current |
| D) | Voltage |
31. An in-circuit meter is used for which of the following purposes?
| A) | To control power to a circuit |
| B) | To reduce circuit losses |
| C) | To prevent circuit overload conditions |
| D) | To monitor circuit operation |
32. If a multimeter has no OFF position, and it is returned to storage, on which of the following positions should the meter be set?
| A) | Ac; highest current range |
| B) | -dc; higher resistance range |
| C) | +dc; highest voltage range |
| D) | Ac; highest voltage range |
33. What range of an ammeter should you use for an initial measurement?
| A) | The lowest range |
| B) | The highest range |
| C) | The mid-scale range |
| D) | Any of these answers |
34. One of the problems encountered in building a multimeter is that the meter movement gives different readings for the same values of ac and dc.
Which of the following features of a multimeter will solve this problem?
| A) | An ac/dc switch |
| B) | A rectifier |
| C) | Separate scales for ac and dc |
| D) | A mirror on the face of the meter |
35. A d’Arsonval meter movement reacts to which of the following values of voltage?
| A) | Peak-to-peak |
| B) | Peak |
| C) | Average |
| D) | Effective |
36. Ammeters measure various ranges through the addition of which of the following components?
| A) | Capacitors in series with the meter movement |
| B) | Shunt resistors in parallel with the meter movement Option 2 |
| C) | Shunt resistors in series with the meter movement |
| D) | Capacitors in parallel with the meter movement |
37. To keep the effect of a voltmeter on a circuit to a minimum, the internal resistance of the voltmeter must have which of the following relationships to the circuit load?
| A) | Lower than |
| B) | Higher than |
| C) | In proportion to |
| D) | Equal to |
38. How does an ammeter affect the circuit being measured?
| A) | It acts as a resistance in series and lowers the circuit current |
| B) | It acts as a resistance in series and raises the circuit current |
| C) | It acts as a resistance in parallel and lowers the circuit current |
| D) | It acts as a resistance in parallel and raises the circuit current |
39. Ohmmeter are classified by type. What are the two types of ohmmeters?
| A) | Series and shunt |
| B) | Full- and half-scale |
| C) | all of these answers |
| D) | Normal and reverse |
40. The function switch on a multimeter does NOT perform which of the following functions?
| A) | Changing of the multimeter from an ammeter to a voltmeter |
| B) | Determination of the proper scale |
| C) | Selection of the meter range |
| D) | Selection of ac or dc capability |
41. What electrical property is reacted to by the electrodynamic, d’Arsonval, moving vane, and thermocouple meter movements?
| A) | Resistance |
| B) | Current |
| C) | Power |
| D) | Voltage |
42. What voltmeter range should be used for initial measurements?
| A) | The mid-scale |
| B) | The highest |
| C) | None of these answers |
| D) | The lowest |
43. When a megger is used to check the insulation of a wire, which of the following indications should be considered normal?
| A) | 500 V |
| B) | 1000 V |
| C) | 0 |
| D) | ∞ |
44. How are ammeters connected in an electrical circuit?
| A) | In series with the load |
| B) | In series-parallel with the load |
| C) | In accordance with Lenz’s Law |
| D) | In parallel with the load |
45. What electrical property is measured by a voltmeter?
| A) | Resistance |
| B) | Voltage |
| C) | Power |
| D) | Current |
46. How is the effect that an ammeter produces in a circuit kept to a minimum?
| A) | By ensuring that the meter resistance is high compared to circuit resistance |
| B) | By ensuring that the meter resistance is low compared to circuit resistance |
| C) | By using a large capacitor in parallel with the ammeter |
| D) | By using a large resistor in series with the ammeter |
47. Which of the following types of meters can be made from a current sensitive meter movement?
| A) | Voltmeter |
| B) | Ohmmeter |
| C) | Ammeter |
| D) | Each of these answers |
48. Current through a meter results in the pointer.
In d’Arsonval meter movement, what force produces this deflection?
| A) | Electrostatic repulsion |
| B) | The interaction of magnetic fields |
| C) | Thermocouple action |
| D) | Mechanical spring tension |
49. A voltmeter has an effect on the circuit being measured; what is this effect called?
| A) | Eddy-current drag |
| B) | Loading |
| C) | Rectification |
| D) | Damping |
50. When, if ever, can you use a dc ammeter to measure ac values?
| A) | Always |
| B) | For low values |
| C) | Never |
| D) | When the ac is high frequency |
51. What device allows a d’Arsonval meter movement to measure ac by converting ac to pulsating dc?
| A) | A pulsator |
| B) | A rectifier |
| C) | A converter |
| D) | A modulator |
52. Meggers (megohmmeters) are used to measure which of the following quantities?
| A) | High resistance |
| B) | High voltage |
| C) | Low voltage |
| D) | Low resistance |
53. An ohmmeter can measure different ranges because of the use of which of the following components?
| A) | Range potentiometers |
| B) | Range resistors |
| C) | Range coils |
| D) | Range capacitors |
54. A voltmeter has a high sensitivity when it has which of the following characteristics?
| A) | High deflection indication |
| B) | Low ratio of internal resistance to full-scale deflection indication |
| C) | High ratio of internal resistance to full-scale deflection indication |
| D) | Low deflection indication |
55. What is the most obvious differences in the two types of ohmmeters?
| A) | The ranges of the meters |
| B) | The size of the test leads of the meters |
| C) | The power sources of the meters |
| D) | The scales of the meters |
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An exceptionally mind boggling exercise for average level practitioners