Journeyman Electrical Closed Book Exam #1 Verified A+
1. Advantage of an electromagnet over a permanent magnet:
- Answer: An electromagnet can be switched on and off.
2. Characteristics of an excellent diffuser surface:
- Answer: Scatters light uniformly in all directions.
3. How light is converted into electricity:
- Answer: In a photovoltaic cell.
4. Name of the rotating part of a DC motor:
- Answer: Armature.
5. Device used to pull wires through a conduit:
- Answer: Fish tape.
6. Resistance of a short circuit when making a resistance test:
- Answer: Approximately zero.
7. How battery cells are connected to increase current capacity:
- Answer: Parallel.
8. Hot resistance of an incandescent lamp compared to its cold resistance:
- Answer: Approximately ten times its cold resistance.
9. Proper way to measure an unknown voltage with a multi-tester:
- Answer: Start measuring at the highest range.
, 10. What a capacitor stores:
- Answer: A charge.
11. Material with the lowest electrical strength:
- Answer: Paper.
12. Type of switch where the moving element is a hinged blade:
- Answer: Knife switch.
13. Factors determining the severity of an electrical shock from a bare live conductor:
- Answer: The contact resistance between the bare wire and the person at the point of contact.
14. Voltage per turn of the primary of a transformer compared to the secondary:
- Answer: The same as.
15. An open resistor reading on an ohmmeter:
- Answer: Infinite.
16. Relationship between wire diameter and resistance:
- Answer: The larger the diameter of the wire, the lesser its resistance.
17. Location of service heads and goosenecks in service entrance cable:
- Answer: Above the point of attachment of the service drops to the building.
18. Type of Type TW conductor:
- Answer: Moisture resistant and thermoplastic.
19. Reason steel is hard to magnetize:
1. Advantage of an electromagnet over a permanent magnet:
- Answer: An electromagnet can be switched on and off.
2. Characteristics of an excellent diffuser surface:
- Answer: Scatters light uniformly in all directions.
3. How light is converted into electricity:
- Answer: In a photovoltaic cell.
4. Name of the rotating part of a DC motor:
- Answer: Armature.
5. Device used to pull wires through a conduit:
- Answer: Fish tape.
6. Resistance of a short circuit when making a resistance test:
- Answer: Approximately zero.
7. How battery cells are connected to increase current capacity:
- Answer: Parallel.
8. Hot resistance of an incandescent lamp compared to its cold resistance:
- Answer: Approximately ten times its cold resistance.
9. Proper way to measure an unknown voltage with a multi-tester:
- Answer: Start measuring at the highest range.
, 10. What a capacitor stores:
- Answer: A charge.
11. Material with the lowest electrical strength:
- Answer: Paper.
12. Type of switch where the moving element is a hinged blade:
- Answer: Knife switch.
13. Factors determining the severity of an electrical shock from a bare live conductor:
- Answer: The contact resistance between the bare wire and the person at the point of contact.
14. Voltage per turn of the primary of a transformer compared to the secondary:
- Answer: The same as.
15. An open resistor reading on an ohmmeter:
- Answer: Infinite.
16. Relationship between wire diameter and resistance:
- Answer: The larger the diameter of the wire, the lesser its resistance.
17. Location of service heads and goosenecks in service entrance cable:
- Answer: Above the point of attachment of the service drops to the building.
18. Type of Type TW conductor:
- Answer: Moisture resistant and thermoplastic.
19. Reason steel is hard to magnetize:
