1. Impact loads are equal to the sum of the magnitude of the loads actually caused and the magnitude if the loads had they been dead loads.
a) True
b) False
Explanation: Impact loads are equal to the difference between the above mentioned entities.
2. Impact load results from which type of effects of loads applied?
a) Static
b) Dynamic
c) Static and dynamic
d) Neither static nor dynamic
Explanation: For static load, impact effects are short lived.
3. How does an increase in the pitch of the roof affects the amount of load that can be placed on it?
a) It increases
b) It decreases
c) Remains constant
d) Depends upon case
Explanation: As rise increases w.r.t span, load carrying capacity decreases.
4. If R1 = 1.1 and R2 = 1.2, then what is value of Lr(in psf)?
a) 26.1
b) 26.2
c) 26.3
d) 26.4
Explanation: Lr = 20 * R1 * R2.
5. Find the value of reduction factor R2 if F (rise to span ratio in inches) is given to be 5.
a) 0.95
b) 0.96
c) 0.97
d) 0.98
Explanation: R2 = 1.2 – 0.05F if 4 < F < 12.
6. What will be the value of reduction factor R1 if value of At is given to be 500ft2
a) 0.5
b) 0.6
c) 0.7
d) 0.8
Explanation: R1 = 1.2-.001At if 200ft2 < At < 600ft2.
7. Which type of drainage system will collect the rainwater?
a) Primary
b) Secondary
c) Tertiary
d) Primary and tertiary
Explanation: Primary system will collect the rainwater through surface drains on the roof and direct it to the storm sewers.
8. What will be the rain load (in psf) if ds is 2 inches and dh is 1 inches?
a) 5.2
b) 10.4
c) 15.6
d) 20.8
Explanation: R= 5.2(ds + dh).
9. Which out of the following is the static head?
a) ds
b) dh
c) ds + dh
d) ds – dh
Explanation: Static head is the depth of water on the undeflected roof up to the inlet of the secondary drainage system when the primary one is blocked.
10. What will be the flow rate (in gallons per minute) if A is 10 ft2 and rainfall intensity is 2 inches per hour?
a) 0.208
b) 0.0208
c) 2.08
d) 20.8
Explanation: Q = 0.0104Ai, where I is the intensity of rainfall in inches per hour.