# Structural Analysis Questions and Answers – Influence Lines for Statically Indeterminate Beams-2

This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Influence Lines for Statically Indeterminate Beams-2”.

1. What will be the value of Rba?
a) 1
b) 0
c) 2
d) 3

Explanation: Δba will be zero as it is roller supported.

2. What will be the value of Rca?
a) 1
b) 0
c) 0.652
d) 0.852

Explanation: It will be the ration of Δca and Δaa. Δaa is 1944/EI and Δca is 1656/EI.

3. What will be the value of Rda?
a) 1
b) 0
c) 0.481
d) 0.681

Explanation: It will be the ration of Δda and Δaa. Δaa is 1944/EI and Δca is 936/EI. Join all these point for ILD.

4. What will be the slope of ILD at point A?
a) 1
b) -1
c) 0
d) can’t say

Explanation: Since point A is fixed joint, slope will always be zero there.

5. What will be the shape of overall ILD?
a) straight line
b) parabola
c) hyperbola
d) arbitrary curve

Explanation: ILD will be basically(approximately) a line passing through all above points but it will be a type of curve as slope near A will be zero and then slope will change.

A and C is a pin support while B is roller support.
XL and XR are centroid of uniform loading on beams AB and BC respectively.
IL and IR are given.
LR and LL are length of beams.
AR and AL are areas of beams.

6. What is the change in slope at point B?
a) AR . XR/LR
b) AL . XL/IL
c) 0
d) AR . XR/E . LR

Explanation: Since point B is roller support, there won’t be any change at of slope at point B.

7. Which of the following is method for solving indeterminate structures?
a) 1 moment equation
b) 2 moment equation
c) 3 moment equation
d) 4 moment equation

Explanation: We will be discussing this method in detail subsequently.

8. 3 moment method is valid in:-
a) single span beams
b) only double span beams
c) double and single span beams
d) only multiple span beams

Explanation: This method is valid in only multiple span beam i.e. including double span.

9. 3 moment method can be used in:-
a) single span beams
b) only double span beams
c) double and single span beams
d) all types of beams

Explanation: Although it is not valid for single span beams, it can be used for them using some particular techniques.

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