Tennessee Electrical Contractor Practice Exam 22

Question 1 of 25

1. Question

Caution signs must meet which of the following specifications?

Predominate color is red, upper panel and borders must be black, the word CAUTION must be in red on the black panel with black lettering used for additional wording on the lower panel.

Predominate color is white, upper panel and borders must be black, the word CAUTION must be in yellow on the black panel with black lettering used for additional wording on the lower panel.

Predominate color is orange, upper panel and borders must be black, the word CAUTION must be in orange on the black panel with black lettering used for additional wording on the lower panel.

Predominate color is yellow, upper panel and borders must be black, the word CAUTION must be in yellow on the black panel with black lettering used for additional wording on the lower panel.

Question 2 of 25

2. Question

What is the current draw of a 15 horsepower, 3-phase, 208 volt motor with an efficiency of 94% and a power factor of 0.96?

53.80 amps

48.55 amps

34.46 amps

19.88 amps

Question 3 of 25

3. Question

When portable ladders are used to access an upper landing surface, the ladder side rails shall extend at least ______________ above the upper landing surface to which the ladder is used to gain access.

2 ft.

2 ½ ft.

3 ft.

3 ½ ft.

Question 4 of 25

4. Question

The secondary winding of the isolation transformer connected to the impedance heating elements used for fixed outdoor electric deicing and and snow-melting equipment shall not have an output voltage greater than __________ ac.

12 volts

30 volts

50 volts

120 volts

Question 5 of 25

5. Question

When replacing a nongrounding receptacle with a grounding –type receptacle, the equipment grounding conductor shall be permitted to be connected to ______________.

any point on the grounding electrode system

any accessible point on the grounding electrode conductor

any accessible equipment grounding terminal bar

All of the above

Question 6 of 25

6. Question

A 12 ft. long horizontal raceway is used to connect 2 panelboards. One of the panelboards is located within a Class II location and is required to be dust-ignitionproof and the other panelboard is not. How many conduit seals are required between these panelboards?

0

1

2

The answer depends on the type of wiring method used.

Question 7 of 25

7. Question

Communications wires and cables shall be separated at least _________ from other conductors of any electric light, power, or Class 1 circuits unless special conditions apply.

1 in.

1 ½ in.

2 in.

3 in.

Question 8 of 25

8. Question

What minimum size THW copper feeder conductors are required to supply the following 3-phase, 208 volt motors?
1 – 15 hp
1 – 25 hp
1 – 75 hp

350 kcmil

400 kcmil

500 kcmil

600 kcmil

Question 9 of 25

9. Question

Information technology equipment shall be permitted to be connected to a branch circuit by a power supply cord not more than ________ in length.

20 ft.

15 ft.

12 ft.

6 ft.

Question 10 of 25

10. Question

Flexible metallic tubing shall not be used for system voltages over __________.

300 volts

600 volts

1,000 volts

No maximum given by the N.E.C.

Question 11 of 25

11. Question

Where fuses are used for motor overload protection, a fuse shall be inserted in each ungrounded conductor and also in the grounded conductor if the supply system is _____________ with one conductor grounded.

4-wire, 3-phase ac

3-wire, 3-phase ac

3-wire, 1-phase ac

2-wire, 1-phase ac

Question 12 of 25

12. Question

What is the minimum calculated service load for 12 – 4,000 watt electric clothes dryers installed in an apartment complex?

48,000 watts

60,000 watts

27,600 watts

22,080 watts

Question 13 of 25

13. Question

Horsepower rated attachment plugs shall not be required for portable motors rated __________ or less.

¼ hp

⅓ hp

½ hp

1 hp

Question 14 of 25

14. Question

Which of the following cable types is an acceptable substitute for a Type CL3P cable?

CL2P

CMP

CL3R

All of the above

Question 15 of 25

15. Question

A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed ____________, or unless barriers are installed between adjacent devices.

600 volts

480 volts

300 volts

277 volts

Question 16 of 25

16. Question

18 AWG fixture wire may be tapped to a 20 ampere rated branch-circuit conductor in lengths not to exceed _____________.

50 ft.

75 ft.

100 ft.

No maximum length given by the N.E.C.

Question 17 of 25

17. Question

A grounded circuit conductor shall be permitted to ground non-current carrying metal parts of equipment, raceways, and other enclosures _____________.

on the supply side or within the enclosure of the ac service-disconnecting means

on the load side of the service disconnecting means

on the load side of a separately derived system

All of the above

Question 18 of 25

18. Question

Type MC cable shall be supported at intervals not exceeding ________.

3 ft.

4 ½ ft.

5 ft.

6 ft.

Question 19 of 25

19. Question

Where a building or structure is supplied by more than one service, a permanent plaque or directory shall be installed _____________ denoting all other services supplying that building or structure and the area served by each.
I. at the front entrance to the building
II. at each service disconnect location

I only

II only

Both I and II

Neither I nor II

Question 20 of 25

20. Question

An incandescent lamp for general use on lighting circuits shall not be equipped with a mogul base if rated over ___________.

20 amperes

30 amperes

300 watts

1,500 watts

Question 21 of 25

21. Question

Outdoor mobile home disconnecting means shall be installed so that the bottom of the enclosure is not less than __________ above the finished grade or working platform.

3 ft.

2 ½ ft.

2 ft.

1 ½ ft.

Question 22 of 25

22. Question

All energized parts of fire pump equipment shall be located at least ________ above the floor level.

4 in.

8 in.

12 in.

18 in.

Question 23 of 25

23. Question

Which of the following statements is/are true regarding low-voltage suspended ceiling power distribution systems?
I. When connected to a multiwire branch circuit, the disconnecting means shall simultaneously disconnect only the ungrounded conductors.
II. Current-carrying conductors for load side utilization equipment shall be copper and shall be 16 AWG minimum.

I only

II only

Both I and II

Neither I nor II

Question 24 of 25

24. Question

A location in which combustible dust is present is classified as a ____________ location.

Class I

Class II

Class III

Class IV

Question 25 of 25

25. Question

Which of the following wiring methods is not allowed for use in Modular Data Centers?

Type MC cable

Type AC cable

Type IGS cable

EMT

Tennessee Electrical Contractor Practice Exam 22