Structural Analysis MCQ - Loading Conditions for Allowable Stress Design

1. With which loads are impact effects considered?
a) Rain
b) Snow
c) Live
d) Fluids

Answer: c
Explanation: Impact effects occur when live loads are quickly applied. So, they are considered with them only.

2. Which of the following load do not vary appreciably with time?
a) Snow
b) Dead
c) Rain
d) Wind

Answer: b
Explanation: There is never a permanent presence of snow on a structure, nor is that of rain and wind.

3. If a full dead load is not acting during an earthquake or a severe wind storm, then chances of overturning of building will:-
a) Decrease
b) Increase
c) Remain same
d) Depend upon case

Answer: b
Explanation: Earthquake and wind load acts in lateral direction, enhancing overturning. While, dead load acts in the vertical downward direction resisting overturning.

4. When two or more loads are acting on a structure in addition to dead load, then ASCE permits the loads other than dead loads to be multiplied by a factor of (provided the result is not less than that produced by dead load and the load causing greatest effect)
a) 0.60
b) 0.65
c) 0.70
d) 0.75

Answer: d
Explanation: In these conditions, most likely loads other than dead one do not achieve their maximum values simultaneously. This assumption is validated by load surveys.

5. When two or more loads are acting on a structure in addition to dead load, then ASCE permits the loads other than dead loads to be multiplied by a factor of 0.75 is:-
a) Compulsory
b) Compulsory in some case
c) Depends upon the engineer
d) Depends upon loads

Answer: c
Explanation: Factor of 0.75 is only helping in listing the minimum conditions to be considered.

6. By Strength Desig method, the load factors are:-
a) Smaller than 0.5
b) 0.5 < 0.75
c) 0.75 < 1
d) Larger than 1

Answer: d
Explanation: Resulting factored load are used to have a design to support the ultimate loads. So, factors are > 1.

7. Purpose of load factors is to account for:-
a) Lapse in designing
b) Lapse in constructing
c) Lapse in funding
d) Lapse in predicting magnitudes of dead or live load

Answer: d
Explanation: It accounts for uncertainties related to estimation of magnitude of dead or live loads.

8. Load factors used for live load are _____ than that used for dead loads.
a) Smaller
b) Larger
c) Depends upon case
d) Depends upon loading

Answer: b
Explanation: Magnitudes of dead loads can be predicted more accurately than magnitudes of live loads.

9. The load factor to be used with strength design depends upon:-
a) Amount of load
b) Is constant
c) Depends upon engineer
d) Depends upon type of structure

Answer: d
Explanation: Load factors are determined statistically and type of structures is considered.

10. Which of the following load combinations is recommended for building structures?
a) D + F
b) 1.4D + F
c) D + 1.4F
d) 1.4(D + F)

Answer: d
Explanation: These are mentioned inn ASCE 7-02 and can be verified from there.