Download 20 MCQ 1. What is the length of conduit needed Answ

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1. What is the length of conduit needed between Points X and Y in Figure A1?
A. 3 1/4 inches C. 12 1/4 inches
B. 8 3/4 inches D. 15 1/4 inches
2. What length of conduit is needed to run from the starting point to the box?
A. 14 3/4 inches C. 24 3/4 inches
B. 18 inches D. 28 inches
3. What is the total gain in this example?
A. 3 1/4 inches C. 6 inches
B. 5 inches D. 8 1/4 inches
4. You’re making a 90-degree bend on 1/2-inch conduit. If your conduit bender has a 5-inch take-up, and you need a 13-inch rise, how for from the starting point would you place your bend mark?
A. 5 1/2 inches C. 8 inches
B. 6 inches D. 12 inches
5. Two students are discussing voltage drop. Student A says voltage drop in a circuit feeding an appliance is the difference between the voltage sent to an appliance and the voltage the appliance receives. Student B says it’s the difference between the voltage sent to an appliance and the maximum voltage the appliance is rated for. Which of the following statements is correct?
A. Only student A is correct. C. Both student A and student B are correct.
B. Only student B is correct. D. Neither student is correct.
6. Wire will be run from a house to a receptacle in a garage 300 feet away. It will be used to supply current for a 1200-watt saw. The panel box supplies 120 volts. The electrician is using No. 12 solid copper-coated wire. What is the approximate voltage delivered to the saw?
A. 10 V C. 108 V
B. 94 V D. 118 V
7. What is the approximate voltage drop from the house to the garage in Question 6 if No.10 gage solid copper-coated wire is used?
A. 4 V C. 10.5 V
B. 7.6 V D. 13 V
8. Two students are discussing the example in Question 6. Student A says the voltage drop is more than is allowed and a larger wire size should be installed. Student B says the voltage drop is not significant and although you could choose another wire size it’s not necessary. Which of the following statements are correct?
A. Student A is correct. C. Both students are correct.
B. Student B is correct. D. Neither student is correct.
9. You’re bending 3/4-inch rigid conduit and both bends are 90 degrees, as shown in Figure A-2. How many inches of conduit will be needed to go from the old box to the new box? Assume that you’re using a manual bender like the one described in your study material.
A. 88 inches C. 96 inches
B. 92 inches D. 100 inches
10. What is the smallest size EMT that can be used with three No. 14 THWN wires and four No. 6 THWN wires?
A. 1/2 inch C. 1 inch
B. 3/4 inch D. 1 1/4 inch
11. To safely run conduit over the joist shown in Figure A3, what series of angles would you use for bends 1 through 4?
A. Two bends at 45 degrees, and two bends at 30 degrees
B. Four bends at 45 degrees
C. Two bends at 22 1/2 degrees, and two bends at 30 degrees
D. Four bends at 22 1/2 degrees
12. What is the total conduit length needed in the run shown in Figure A4 if bends A and B are 45
degrees and have a 5-inch offset? (Assume you’re using a bender with the same characteristics as those of the typical bender described in your study material.)
A. 45 inches C. 46 5/8 inches
B. 45 7/8 inches D. 46 7/8 inches
13. What is the largest of the following ampacities that is allowable in a raceway containing thirty-six No. 10 RHW-2 copper wires in an area where the ambient tempature is 30_C (86_F)?
A. 10 A C. 19 A
B. 16 A D. 20 A
14. What percentage of voltage loss occurs in a coated No. 18 stranded copper wire carrying 3A of current and running 228 feet from a 115-volt source to a receptacle?
A. 9 C. 12
B. 10 D. 88
15. In Figure A-5 conduit is run over a beam to a wall and down to a receptacle box. Which of the following descriptions correctly describes the conduit bends shown?
A. A three-bend saddle with a 90-degree bend at the corner between the ceiling and wall
B. A four-bend saddle with a 90-degree bend at the corner between the ceiling and wall
C. A three-bend saddle with a 45-degree bend at the corner between the ceiling and wall
D. A four-bend back-to-back bend with a 90-degree bend at the corner between the ceiling and wall
16. What size rigid metal conduit should be used to house eight No. 6 RH wires and nine No. 14 FEP wires?
A. 1 1/2 inch C. 2 1/4 inch
B. 2 inch D. 2 1/2 inch
17. Which of the following is a true statement about bending conduit?
A. A large-radius 90-degree bend will result in a larger gain.
B. A small-radius 90-degree bend will result in a larger gain.
C. The amount of gain isn’t related to the radius of a bend.
D. The gain from a 90-degree bend is always 3 1/4 inches.
18. You’re making a 90-degree bend in 1/2-inch EMT. In order to end up with a rise of 12 inches, you need a stub length equal to
A. 5 inches C. 7 inches
B. 6 inches D. 8 inches
19. Two students are discussing supports needed for cable. Student A says that for a 14-foot run of cable between two receptacles, four fasteners will be needed. Student B says that they can run it through the studs as long as they drill the holes within 1/4 inch of the edge of the studs. Which of the following statements is correct?
A. Only student A is correct. C. Both students are correct.
B. Only student B is correct. D. Neither students are correct.
20. What is the total shrinkage of a set of 30-degree offset bends with a depth of 7 inches, and a set of 22 1/2-degree offset bends with a 4-inch depth.
A. 2 1/2 inches C. 7 1/2 inches
B. 3 inches D. 10 inches

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