Code Test Questions

[Max Hudson]

Here are a few questions from a code test and also a code sample question
test that I am having trouble answering:
1-What is the demand factor for large appliances?
A-50
B-75
C-80
D-100
2-A 1' rigid metal conduit with 4 current carrying conductors is permitted to be filled up to _____ percent of it's capacity.
A-125
B-100
C-80
D-40
Key says 40, I think its 80 T310.15(B)(2)(a)
3-A restaurant has the following equipment: 1 16KW cook top, 1 8KW dishwasher, 1 5KW water heater, 1 3KW dough roller, 1 2KW exaust fan. Useing the optional calculation method for kitchen equipment, the MINIMUM service demand for these loads would be
A-42.5KW
B-34.5KW
C-28.1KW
D-23.8KW
I came up with 32KW?
4-An eight unit apartment is served by a 120/208 volt 3 phase 4 wire system. Each apartment has a 4.5KW single phase 120/208 volt dryer. What would be the MINIMUM service demand for these dryers?
A-40KW
B-36KW
c_24KW
D-21KW
I come up with 27KW?
5-How many square inches of an electrical metallic tubing conduit that is 18" long can be used for conductor fill?
A-0.141
B-0.181
C-0.272
D-0.454
This question doesn't make sense to me?
6-According to the NEC, a 1 1/4" deep 4" square metal box has a MINIMUM cubic inch capacity of how many cubic inches?
A-24
B-23
C-22
D-20
I come up with 18"?
7-Which of the following correctly indicates the phase rotation of a 3 phase 120/208 wye type system?
A-A-C-B
B-C-B-A
C-B-C-A
D-C-B-A

 

[wbalsam1]

I'll answer one question. Q#2. Answer is 40%. See Chapter 9 Table 1.:smile:

 

[stickboy1375]

Q6, I come up with 18 cu. in. as well.

 

[wbalsam1]

Q6, I come up with 18 cu. in. as well.

I come up with 20 cu. in.
4X4 X 1.25
4X4=16 X 1.25 =20 cu. in. :smile:

 

[stickboy1375]

I come up with 20 cu. in.
4X4 X 1.25
4X4=16 X 1.25 =20 cu. in. :smile:

I used the table in the nec. 314.16(A), (2002 NEC) How did they end up with 18?

 

[wbalsam1]

I used the table in the nec. 314.16(A), (2002 NEC) How did they end up with 18?

Whoever made up the test question should have mentioned this Table, or at the least, included as a choice the answer "18". There are several dumbly worded q's. Take a look at q# 7. B & D are the same choices.

 

[stickboy1375]

Whoever made up the test question should have mentioned this Table, or at the least, included as a choice the answer "18". There are several dumbly worded q's. Take a look at q# 7. B & D are the same choices.

Cool, my odds just went up from 25% to 33.3% of getting it correct! :grin:

 

[Dennis Alwon]

I come up with 20 cu. in.
4X4 X 1.25
4X4=16 X 1.25 =20 cu. in. :smile:

I believe that is not correct since the 4x4x 1.25" deep is the outside dimensions of the box. The question states according to the NEC....

I went right to the Tables so I believe the answers given are not correct.

!8 is my answer.

 

[wbalsam1]

I believe that is not correct since the 4x4x 1.25" deep is the outside dimensions of the box. The question states according to the NEC....

I went right to the Tables so I believe the answers given are not correct.

!8 is my answer.

I agree. Test is wrong.

 

[ray cyr]

#3 220.56 & T220.56
#4 220.54 & T220.54
#5 needs a trade size then table 4

 

[Lcdrwalker]

#7 C The easy one.

 

[CAPS]

Question 2. A 1 foot RMC would be a nipple (Ch9 Table 1 ex(4))and can be filled to 60%, and ampacity adjustments do not apply. This is not one of the answer choices. If the OP meant a 1 inch RMC then I agree with Wbalsam1 40%.
This is a poor test. You can not fill a conduit to 125%.