In this article, you will find the circuit control devices objective questions and answers for instrumentation, electrical, and electronics engineers.
The below list provides all the multiple-choice questions (MCQ) related to the circuit control devices.
Answers are available at the bottom of the article.
1. What is the maximum number of different single-pole, double-throw switch positions possible?
| A) | Two |
| B) | Four |
| C) | Three |
| D) | One |
2. When you perform preventive maintenance on a switch, which of the following items should be checked?
| A) | The terminals for corrosion |
| B) | The switch operation for smooth and correct operation |
| C) | All of these answers |
| D) | The physical condition of the switch |
3. Control of a circuit requiring a temporary actuation signal is provided by which of the following switches?
| A) | Rotary |
| B) | Momentary |
| C) | Locked-out |
| D) | Locked-in |
4. To guard against the accidental actuation of a circuit, which of the following types of switches are used?
| A) | Momentary |
| B) | Rotary |
| C) | Locked-out |
| D) | Locked-in |
5. What should be used to clean the contacts of a relay?
| A) | A jeweler’s file |
| B) | Emery cloth |
| C) | A burnishing tool |
| D) | Sandpaper |
6. Checking a switch with the circuit power NOT applied is accomplished by using which of the following meters?
| A) | Frequency meter |
| B) | Wattmeter |
| C) | Ohmmeter |
| D) | Temperature meter |
7. What should be used to adjust contact clearances on a relay?
| A) | A pair of hemostats |
| B) | A pair of pliers |
| C) | A point bender |
| D) | A burnishing tool |
8. Control or selection of one or more circuits is a function of which of the following switches?
| A) | A multi-contact switch |
| B) | A manual switch |
| C) | A single contact switch |
| D) | An automatic switch |
9. A switch actuator is described by which of the following terms?
| A) | Four-position |
| B) | Toggle |
| C) | Momentary |
| D) | Two-position |
10. Which of the following is an automatic switch?
| A) | A dial or push button on a telephone |
| B) | An ignition switch on a motor vehicle |
| C) | A switch that turns on a light in a refrigerator |
| D) | A channel selector on a television |
11. Checking a switch with the power applied is accomplished by using which of the following meters?
| A) | Megger |
| B) | Wattmeter |
| C) | Voltmeter |
| D) | Ohmmeter |
12. Designation of switch voltage rating is based on which of the following voltage values?
| A) | Maximum |
| B) | Nominal |
| C) | Minimum |
| D) | Average |
13. If a relay is hermetically sealed with an opaque cover, which of the following methods should be used to determine whether the relay is operating?
| A) | Shake the relay and listen for loose parts |
| B) | Place your finger on the cover and feel the relay contact movement |
| C) | Remove the cover and visually observe the relay contacts when the relay is activated |
| D) | Activate the relay and observe whether a metal object is attracted by the magnetic field |
14. What is the common name for an accurate snap-acting switch?
| A) | Multi-switch |
| B) | Maxi-switch |
| C) | Mini-switch |
| D) | Micro-switch |
15. Designation of switch current rating is based on which of the following current values?
| A) | Nominal |
| B) | Minimum |
| C) | Average |
| D) | Maximum |
16. What is the maximum number of different single-pole, single-throw switch positions possible?
| A) | Two |
| B) | Three |
| C) | Four |
| D) | One |
17. Circuit control devices should NOT be used for which of the following reasons?
| A) | To apply power to a device when work is completed on it |
| B) | To select the function or circuit desired within a device |
| C) | To remove power from a malfunctioning device |
| D) | To adjust the power level of a device |
18. To guard against the accidental turning off of a circuit, which of the following types of switches are used?
| A) | Momentary |
| B) | Rotary |
| C) | Locked-out |
| D) | Locked-in |
19. If a solenoid is not operating properly, which of the following items need NOT be checked?
| A) | Energizing voltage |
| B) | Coil |
| C) | Armature |
| D) | Plunger |
20. A solenoid is commonly used in which of the following devices?
| A) | A fuel quantity indicating system |
| B) | A starter for a motor vehicle |
| C) | A sound-powered telephone system |
| D) | A shipboard lighting system |
21. A solenoid is based upon which of the following principles?
| A) | A soft iron core moving in a magnetic field creates a current |
| B) | A thermocouple produces a current when heated |
| C) | A coil attracts a soft iron core when current flows in the coil |
| D) | A bimetallic strip bends when it is heated |
22. Which of the following are types of circuit control devices?
| A) | Solenoids |
| B) | Relays |
| C) | All of these answers |
| D) | Switches |
23. If a relay is NOT operating properly, which of the following items need NOT be checked?
| A) | The armature resistance |
| B) | The contact spacing |
| C) | The terminal leads |
| D) | The contact surfaces |
24. Which of the following is a manual switch?
| A) | A distributor |
| B) | A thermostat |
| C) | A light switch |
| D) | A limit switch |
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