Mid-Term Exam

Question 1

A Class I circuit conductor shall have a minimum insulation rating of how many volts?

Answer 1

600 Volts

NEC Article 725 Class I Circuits - 725.41 - 725.49B

Question 2

A metal water pipe that runs underground can serve as a grounding electrode if it is in direct contact with the earth for at LEAST _____ feet or more.

Answer 2

10FT

NEC Index - Grounding/Electrodes - 250 Part III - Grounding Electrode 250.30A4 - 250.52A1

Question 3

A method for finding total resistance of a parallel circuit is the _____ formula.

Answer 3

All of the above.

?

Question 4

An electric motor is running on 120 V. The current is measured to be 2A. How many OHMS of resistance is the motor?

Answer 4

60 OHMS

?

Question 5

And electrical circuit has a voltage of 50 V and a resistant of 5 OHMS. What is the value of the current?

Answer 5

10A

?

Question 6

An opposition to current flow that occurs in alternating current circuits is called ____.

Answer 6

A Current

?

Question 7

Current that flows in only one direction is called Unidirectional. It is also referred to as _____ current.

Answer 7

Direct Current

?

Question 8

Electron flow theory states that current flows from the most negative point in the current to the most positive point in the circuit. This is due to the fact that electrons are _____ particles.

Answer 8

Moving

?

Question 9

Fire alarm cable must be protected by a metal raceway or rigid nonmetallic conduit up to what height from the floor?

Answer 9

7FT

?

Question 10

Fire alarm circuits and equipment shall be grounded _____.

Answer 10

In accordance with Article 250.

?

Question 11

For conductors not in enclosures or hoistways, Power limited fire alarm cable shall be separated from electric light and power, Class I and NPLFA cables Buy a minimum of _____.

Answer 11

2in

?

Question 12

Given a parallel circuit with 3 resistors, each measuring 15 OHMS, what is the total resistance of the circuit?

Answer 12

5 OHMS

?

Question 13

Given a series circuit with 3 resistors, each measuring 20 OHMS, what is the total resistance of the circuit?

Answer 13

60 OHMS

?

Question 14

Grounding conductors for equipment shall be what color?

Answer 14

Green, Green Stripped with one or more Yellow stripes, or Bare/Copper.

(?)

Question 15

If one of the parallel paths is broken, current will not continue to flow in any path.

Answer 15

False

?

Question 16

In a parallel circuit, the total resistance is _____ value resistance.

Answer 16

Smaller than the smallest

?

Question 17

In a series circuit the amperage at any point in the circuit is the same.

Answer 17

True

?

Question 18

In order to have current flow, circuit must be _____.

Answer 18

Closed.

?

Question 19

Non-power limited fire alarm cable shall have an insulation rating of not less than_____.

Answer 19

600 Volts.

?

Question 20

Of the following cable types, which of the following may not be used as a power limited riser cable?

Answer 20

CL3

?

Question 21

Opposition to current flow is called_____.

Answer 21

Resistance.

?

Question 22

Power limit a fire alarm cable installed in hoistways shall be installed in_____.

Answer 22

Rigid Metal Conduit.

?

Question 23

Power sources for power limited fire alarm circuits must be protected by an overcurrent device not rated at more than _____.

Answer 23

20 AMPS

?

Question 24

The accessible portion of abandoned fire alarm cable must be _____.

Answer 24

Removed.

?

Question 25

The AHJ has required you to remove the fire alarm cable installed above the drop ceiling because it is not appropriate for an environmental airspace. What type of cable should your supervisor order to replace the cable you are removing?

Answer 25

FPLP

?

Question 26

The grounding electrode system may be any of the following except _____.

Answer 26

A fire sprinkler lateral at least 2 inches in diameter.

?

Question 27

The sum of the currents through each path is equal to the total current that flows from the source.

Answer 27

True.

?