PPD Practice quiz

Practice quizzes
21

1foot = 1/3 yard. Wouldn’t you divide by 27ft, not multiply?

22

Hello. Q30 is blurred the options to answer and is clear the answer. Thanks

23

@thinlinegroup.llc Thanks for bringing this to our attention! I’ve fixed this so that you can now view the available answer choices, with the correct answer/explanation blurred.

Kiara Galicinao, AIA, NCARB
Black Spectacles

24

on question 12, I believe the answer should be “B” not “C” could you confirm please and why?

25

@Michael.Kirolos, I understand your confusion, as moment diagrams were never a strong-suit of mine. As the answer explanation states:

Choice B is incorrect because the moment for a simply-supported, uniformly-loaded beam is positive, which means it is drawn above the baseline and not below.

You may be picturing the physical/literal result of a beam under loading; it would bend at the middle and form a smile (as shown in answer choice B). However, a moment diagram does not represent this condition; it depicts the magnitude of forces. In this case, the force is greatest in the middle and zero at the supports. Therefore, the moment is positive and above the x-axis (as shown in answer choice C).

Check out the references indicated, as these will provide some additional context to moment diagrams:
Ref: Building Construction Illustrated 2.15; Simplified Engineering for Architects and Builders

Hope this helps!

Kiara Galicinao, AIA, NCARB
Black Spectacles

1 Like
26

Hi Kiara,

Thanks for your response. I consulted a structural engineer, who confirmed that the correct answer should be B. The moment for the simple beam matches the smile shape. Could you please verify this with structural expertise?

27

Hi @Michael.Kirolos,

Thanks for following up on this. I just confirmed with our subject matter expert that either B or C could be considered correct; it is just a matter of convention. I think typically, we would see answer choice C for ARE purposes, but B could definitely be correct as well.

I will adjust the question and available answers to eliminate this confusion.

Kiara Galicinao, AIA, NCARB
Black Spectacles

1 Like
28

Thank You Kiara!

1 Like
29

I believe wood studs provide higher STC ratings than metal studs, so right answer could be B, C, F could
you please double check and confirm, that is regarding question no. 29 in PPD Practice Quiz

30

@Michael.Kirolos Metal studs typically have higher STC ratings than wood studs, as they have better flexibility and are less stiff. Sound is transmitted through walls via vibrations, so flexible walls (such as those made with thinner gauge steel studs) can absorb more of the vibrations.

You may be thinking that wood, having more mass, would do the trick. However, when it comes to STC specifically, flexibility is the key component.

Hope this helps!

Kiara Galicinao, AIA, NCAB
Black Spectacles