Reference no: EM131328459

Assignment:

Part 1: Conductors

1. A type TW cable containing two No. 12 copper conductors has a maximum overcurrent protection of
A. 15 A.
B. 25 A.
C. 30 A.
D. 20 A.

2. Which one of the following types of wire can be used with the pressure terminals of a duplex receptacle?
A. Stranded copper
B. Solid aluminum
C. Solid copper
D. Stranded aluminum

3. The calculation used to determine amperage of a conductor based on the total number of conductors in a conduit is called
A. derating.
B. voltage drop.
C. conduit fill.
D. conductor fill.

4. A conductor that's described as a 750 MCM wire has an area of
A. 750,000 kcmils.
B. 750 in 2.
C. 750 cmils.
D. 750 kcmils.

5. Ampacity, or the maximum flow of electricity for a time period,
A. isn't dependent on wire diameter or number.
B. increases as wire number increases.
C. increases as wire diameter increases.
D. decreases as wire number decreases.

6. The diameter of a No. 6 wire is larger than a
A. No. 4 wire.
B. No. 12 wire.
C. No. 2/0 wire.
D. 250 kcmil cable.

7. If a cable insulation is described as RHW, you would be able to use the cable for what maximum temperature?
A. 86°F
B. 194°F
C. 140°F
D. 167°F

8. The most widely used insulator for splices of smaller wires, like those used for devices, is
A. friction tape.
B. a wire nut.
C. solder.
D. a split bolt.

9. The ampacity of a No. 12 aluminum wire with RHW insulation installed in a raceway that has 19 other wires is
A. 5 A.
B. 15 A.
C. 7 A.
D. 10 A.

10. What is the ampacity of a No. 3/0, THHN copper wire, in a conduit with one other conductor?
A. 225 A
B. 350 A
C. 175 A
D. 200 A

11. When soldering a lug onto a copper wire, you would use
A. acid-core solder only.
B. both plain solder and an acid.
C. plain solder without flux.
D. rosin-core solder only.

12. An electric iron is plugged into a receptacle that has 110 V present. If the voltage loss from the panel to the receptacle is 6 V, the line voltage at the panel is
A. 116 V.
B. 104 V.
C. 110 V.
D. 120 V.

13. A nonshielded cable with a 1.5-inch diameter should have a minimum bending radius of
A. 6.0 in.
B. 12.0 in.
C. 1.5 in.
D. 18.0 in.

14. The ease with which a material allows electricity to move is called
A. potential.
B. voltage.
C. ampacity.
D. conductivity.

15. Five No. 8 aluminum conductors with THHN insulation are to be routed through a conduit found in a boiler room with an ambient temperature of 75°C. The ampacity of each conductor is
A. 48.0 A.
B. 36.6 A.
C. 14.8 A.
D. 17.0 A.

16. A conductor with a diameter of 100 mils has an area of
A. 0.00785 in
B. 100 kcmil.
C. 0.01 cmil.
D. 100 in

17. Which type of tape is used to round sharp edges on splices using larger conductors?
A. Friction tape
B. Cotton tape
C. Rubber tape
D. Plastic tape

18. A single No. 10 copper wire with type THW insulation that's used in free air with an ambient temperature of 158°F has an approximate ampacity of
A. 40.0 A.
B. 36.9 A.
C. 16.5 A.
D. 31.9 A.

19. What size copper wire should be used for a 125 ft, 15 A branch circuit if a maximum voltage drop of 3.2 V is allowed?
A. No. 14
B. No. 10
C. No. 8
D. No. 12

20. Ideally, NM or armored cable should be installed in a wall stud at least how far back from the front edge of the stud?

Part 2: Math for the Trades

1. Take a look at the figure. Use the formula I = to calculate the current in the circuit shown.
A. 0.25 A
B. 4 A
C. 10 A
D. 100 A

2. The length of a room is 20 feet and its width is 12 feet. What is the perimeter?
A. 52 feet.
B. 32 feet.
C. 64 feet
D. 44 feet.

3. Take a look at the figure. What is the first step you should take to solve the formula?
A. Cancel 6 into 6.
B. Subtract 2 from 3.
C. Find the value of 6 squared.
D. Multiply 3 by 6.

4. Which one of the following formulas correctly expresses the following statement: The number x is equal to another number n plus the square root of 3.

5. In percent problems, the term rate refers to the
A. whole amount that's being considered.
B. percent of increase or decrease.
C. comparison of one ratio to another.
D. part of the whole amount that's being considered.

6. Express the fraction
A. 2.86
B. 2.85
C. 0.285
D. 0.286

7. An electric heater uses hour? How many watts of power will the heater use in watts of power each hour.

8. When drawing an angle with a protractor, after you've drawn the first side of the angle, your next step is to

A. draw the second side of the angle.
B. mark the vertex of the angle.
C. make a dot marking the angle measurement that you are drawing.
D. calculate the number of minutes in the angle you are drawing.

9. During a four-week period, you worked the following hours:
Week 1- 36
What is the average number of hours you worked in one week?
A. 38
B. 39

10. Take a look at the figure. The distance h a body will move in free fall is expressed by the formula shown. If g = 980 centimeters per second
A. 368,000 centimeters
B. 196,000 centimeters
C. 49,000 centimeters
D. 9,800 centimeters

11. Fractions can be added and subtracted only if they're __________ fractions.
A. proper
B. unlike
C. like
D. improper

12. What is the product of

13. Find the area of a circle with a radius r of 6 feet. Round off your answer to one decimal point. Hint: the formula for the area of a circle is A = p r
A. 355.3 sq ft
B. 113.1 sq ft
C. 18.8 sq ft
D. 59.2 sq ft

14. Which one of the following distances is the longest?
A. 20 inches
B. 7 feet
C. 50 inches
D. 3 yards

and p should be approximated to four decimal places.

15. Corrugated Specialties produces boxes of all kinds, and they manufacture an average of 67,000 shirtsize boxes per month. In November, they were told to increase production by 35%. How many shirt size boxes will they produce in November? Hint:This question requires two calculations.
A. 23,625
B. 91,125
C. 23,450
D. 90,450

16. The expression a = 3b+ 2 can be written in words as: the quantity a is equal to
A. three times the square root of b plus two.
B. two plus the square root of three 3 b.
C. three times the quantity two plus b squared.
D. two more than three times the quantity b squared.

17. Take a look at the figure. What is the value of y?
A. y = 14
B. y = 16
C. y = 64
D. y = 32

18. An angle that contains 126 degrees and 32 minutes is a(n) ____________ angle.
A. acute
B. right
C. straight
D. obtuse

19. A triangle-shaped machine part has sides of 2
A. 11
B. 10

20. Suppose you're given the formula R = s + 2t. If you know that s is three times greater than t, how could you rewrite the formula?
A. R = 3(s + 2t)
B. R = 5s
C. R = 3(s + t)
D. R = 5t

Part 3: Working with Conduit

1. What is the take-up amount for a stub-up bend using 1-inch IMC?
A. 16 and 5/8 inches
B. 11 inches
C. 8 inches
D. 5 and 5/8 inches

2. The maximum length between supports for a straight horizontal 1
A. 14 feet.
B. 10 feet.
C. 20 feet.
D. 3 feet.

3. When installing conduit for a mast service, what type of conduit should you use?
A. EMT
B. IMC
C. Rigid-nonmetal
D. Rigid-metal

4. If the middle bend of a three-bend saddle is a 30-degree bend, the two outside bends will each have angles of
A. 45 degrees.
B. 60 degrees.
C. 30 degrees.
D. 15 degrees.

5. When making an offset in conduit, if the spacing between marks is double the offset depth, you know that the offset angle is
A. 30 degrees.
B. 45 degrees.
C. 22 1/2 degrees.
D. 90 degrees.

6. When installing EMT conduit that will be exposed to wet conditions, _______ fittings should be used.
A. indenter
B. threaded
C. set-screw
D. compression

7. Which of the following bending angles would you probably make if the handle of your bender ends up in a vertical position?
A. 180 degrees
B. 60 degrees
C. 90 degrees
D. 30 degrees

8. A hand-operated conduit bender with a shoe for bending 1-inch EMT can also be used to bend
A. 1/2 inch EMT.
B. 1-inch IMC.
C. 3/4 inch IMC.
D. 1-inch rigid conduit.

9. You need to add a piece of 5 feet from a wall and an outlet box that's located 4 feet up the wall. If you're going to thread the new piece before bending it, the length of conduit required will be
A. 9 feet 0 inches.
B. 8 feet 4 inches.
C. 9 feet 4 inches.
D. 8 feet 8 inches.

10. Which of the following combinations of bends can be used in a conduit run?
A. One 90-degree, six 45-degree and one 30-degree
B. One 90-degree, three 45-degree, and four 30-degree
C. Two 90-degree, four 45-degree, and one 30-degree
D. Two 90-degree, two 45-degree, and four 30-degree

11. A(n) _______ must be attached to the top end of a conduit riser, where conduit is used in a service installation.
A. entrance ell
B. LB
C. bushing
D. service entrance head

12. What is the cross-sectional area of a wire if its outside diameter is 0.0625 inch?
A. 0.0031 inch
B. 0.7850 inch
C. 0.0002 inch
D. 0.0491 inch

13. A bend used to clear an obstruction and return to the original line of run is called a(n)
A. saddle.
B. offset.
C. back-to-back.
D. re-bend.

14. Another name for thinwall conduit is
A. Greenfield.
B. EMT.
C. busway.
D. IMC.

15. The internal area of 2-inch IMC is
A. less than the internal area of 2-inch rigid metal conduit.
B. less than the internal area of 2-inch EMT.
C. the same as the internal area of 2-inch EMT.
D. greater than the internal area of 2-inch rigid metal conduit.

16. A 10-inch beam is in the path of a conduit run from a junction box which is located 38 inches from the beam. The beam is to be bypassed by a 30-degree offset with the second offset bend occuring at the corner of the beam. At what distances from the outlet box will the two bends be marked on a length of 1-inch EMT?
A. 20 1/2 inches and 40 1/2 inches
B. 18 inches and 38 inches
C. 8 inches and 48 inches
D. 38 inches and 40 1/2 inches

17. Electrical metallic tubing would be used in an electrical installation because it
A. has a thicker wall than intermediate metal conduit.
B. is less expensive than rigid metal conduit.
C. can be threaded for tighter connections.
D. can be used in corrosive soil.

18. One governing factor when determining the minimum size of conduit to be used is the
A. length of the conduit.
B. location.
C. conductor fill.
D. presence of water.

19. Using 1/2-inch EMT and a hand bender, you want to make a bend with a 14-inch stub-up. How far from the end of the conduit should you put the mark that will line up with the bender arrow?
A. 19 inches
B. 14 inches
C. 16

20. A _______ bend is necessary when attaching a piece of conduit between outlet boxes on facing walls.
A. back-to-back
B. saddle
C. single
D. offset.