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1. Equipment that is incapable of releasing sufficient electrical energy to cause ignition of a hazardous atmospheric mixture is considered ________.

explosionproof

Class I, Group D

intrinsically safe

Class II, Group G

Question 1 of 15

2. Which of the following is approved for use in most Class I, Division 1 locations?

PVC

EMT

Liquid-tight conduit

Rigid metal conduit

Question 2 of 15

3. Anesthetizing locations of hospitals are considered to be Class I, Division 1 locations to a height of ________.

2' above the floor

3' above the floor

4' above the floor

5' above the floor

Question 3 of 15

4. Locations in which flammable gases or vapors may be present in the air in quantities sufficient to produce explosive or ignitable mixtures are identified as ________.

Class II locations

Class I locations

Class III locations

Class IV locations

Question 4 of 15

5. The main purpose of an explosionproof flexible coupling is to connect ________.

motors to a raceway system

raceways with conductors that have varying voltages

pull boxes to a raceway system

pushbutton control stations

Question 5 of 15

6. In hazardous locations where threaded metal conduit is required, threaded joints must be made up with at least how many threads fully engaged?

Five

Three

Four

Two

Question 6 of 15

7. In general, when are seals typically installed?

Before the conduit system is installed

At the same time as the conduit system

After the conductors have been installed

After the conduit system is installed

Question 7 of 15

8. The main purpose of seals or sealoffs in conduit runs is to ________.

insulate the wires

prevent moisture from entering the raceway system

prevent the passage of gases, vapors, or flames from one portion of the system to another

isolate different voltages from each other

Question 8 of 15

9. The requirements of electrical equipment and wiring for all voltages in locations where fire or explosion hazards may exist are covered in ________.

NEC Article 511

NEC Article 514

NEC Articles 525 and 530

NEC Articles 500 through 504

Question 9 of 15

10. What is the classification and division of all floor-level areas up to a height of 18" in an airport hangar?

Class II, Division 2

Class I, Division 2

Class II, Division 1

Class I, Division 1

Question 10 of 15

11. Which of the following locations are hazardous due to the presence of combustible dust?

Class III locations

Class II locations

Class I locations

Class IV locations

Question 11 of 15

12. Which of the following best describes the devices that will help prevent moisture from collecting in raceway systems?

Elbows

Integral drains

Strainers

Sealoff fittings

Question 12 of 15

13. The space in the immediate vicinity inside of the motor dispensing unit at an automotive service station is identified as a ________.

Class III, Division 1 location

Class I, Division 2 location

Class I, Division 1 location

Class II, Division 1 location

Question 13 of 15

14. A Class I, Division 1 location is best described as an atmosphere that ________.

is not normally hazardous

is never hazardous

is normally hazardous

could become hazardous

Question 14 of 15

15. Which of the following covers intrinsically safe equipment?

NEC Article 502

NEC Article 504

NEC Article 501

NEC Article 503

Question 15 of 15

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