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Influence Lines - Free MCQ Practice Test with solutions, GATE Civil Structural


MCQ Practice Test & Solutions: Test: Influence Lines (9 Questions)

You can prepare effectively for Civil Engineering (CE) Structural Analysis with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Influence Lines". These 9 questions have been designed by the experts with the latest curriculum of Civil Engineering (CE) 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 9

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Test: Influence Lines - Question 1

While writing influence line equations, left most point is always considered as origin and following sign convention is followed.

Q. In BMD and SFD :-

Detailed Solution: Question 1

Answer: b
Explanation: In BMD and SFD, we analyze the structure by fixing loads initially.

Test: Influence Lines - Question 2

While writing influence line equations, left most point is always considered as origin and following sign convention is followed.

Q.  in influence line diagrams (ILD) :-

Detailed Solution: Question 2

Answer: a
Explanation: In ILD we analyze effect of a force or moment on a fixed point by constantly varying point of application of load/moment.

Test: Influence Lines - Question 3

While writing influence line equations, left most point is always considered as origin and following sign convention is followed.

Q.  For drawing ILD, what value of test load is assumed?

Detailed Solution: Question 3

Answer: a
Explanation: 1 unit load is assumed as calculations are easy then. Actual loads are multiplies with the results obtained to calculate further.

Test: Influence Lines - Question 4

While writing influence line equations, left most point is always considered as origin and following sign convention is followed.

Q.   ILD of statically determinate beams consists of curve as well as straight lines.
State whether the above statement is true or false.

Detailed Solution: Question 4

Answer: b
Explanation: ILD of statically determinate beams consist of only straight lines.

Test: Influence Lines - Question 5

Following figure is for questions 5 and 5.

AB is of length 1m.

Q.   What will be the equation for vertical reaction at point A (RAY)?

Detailed Solution: Question 5

Answer: a
Explanation: Place unit load at any variable distance X and calculate RAY by conserving moment about point B.

Test: Influence Lines - Question 6

Following figure is for questions 5 and 5.

AB is of length 1m.

Q.  What will be the shape of ILD curve for vertical reaction at point A (RAY)?

Detailed Solution: Question 6

Answer: a
Explanation: On plotting the above given equation, shape of curve will come out to be triangular.

Test: Influence Lines - Question 7

Following figure is for questions 7 and 8.

AB = BC = 1m

Q.  What will be the equation for vertical reaction at point B (RBY)?

Detailed Solution: Question 7

Answer: d
Explanation: Take load at any variable distance X and conserve load about point A.

Test: Influence Lines - Question 8

Following figure is for questions 7 and 8.

AB = BC = 1m

Q.  Where will be the maximum point of ILD lie?

Detailed Solution: Question 8

Answer: c
Explanation: On drawing curve based on the above equation, we will find that maximum point will lie at C.

Test: Influence Lines - Question 9

Following figure is for questions 7 and 8.

AB = BC = 1m

Q.   Maximum point of ILD always lies at the point at which load is applied.
State whether the above statement is true or false.

Detailed Solution: Question 9

Answer: b
Explanation: In the above example above sentence is proved wrong.

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