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Structural Analysis Mcqs

Q:

How many degrees of freedom are counted for a fixed support while calculating DKI?

A) 0 B) 1
C) 2 D) 3
 
Answer & Explanation Answer: A) 0

Explanation: In fixed support, there is no possibility of deflection, so no degree of freedom is counted.

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144
Q:

Tree method is used to find DSI.
State whether the above statement is true or false.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Tree method is used to find DSI in planar frame structures.

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36
Q:

Which of the following is a correct equation for the DSI of a planar frame?

A) 3b + r + 3j-c B) 3b + r – 3j-c
C) 3b – r – 3j-c D) depends upon structure
 
Answer & Explanation Answer: B) 3b + r – 3j-c

Explanation: Each member will give 3 unknowns and each joint will 3 equations.
Here, b = no. of members in a structure
r = no. of unknown reactions in member
j = no. of joints in the structure
c = no. of extra equations in the structure

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47
Q:

Which of the following is a correct equation for the DSI of a frame?

A) 3b + r + 3j B) 3b + r – 3j
C) 3b – r – 3j D) depends upon structure
 
Answer & Explanation Answer: D) depends upon structure

Explanation: It depends upon whether that frame is planar or space.
Here, b = no. of members in a structure
r = no. of unknown reactions in member
j = no. of joints in the structure
c = no. of extra equations in the structure

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117
Q:

Which of the following is the correct equation for DSI of a truss?

A) b + r – 2J B) b + r + 2J
C) b – r – 2J D) b – r – 2J
 
Answer & Explanation Answer: A) b + r – 2J

Explanation: b and r gives no. of unknown forces and 2j is the no. of equations available.
Here, b = no. of members in a structure
r = no. of unknown reactions in member
j = no. of joints in the structure
c = no. of extra equations in the structure

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95
Q:

If an internal hinge is there in a frame member, then this member is:-

A) stable B) unstable
C) determinate D) can’t say
 
Answer & Explanation Answer: B) unstable

Explanation: 4 equations and 3 unknowns are there. So, it is unstable.

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261
Q:

If all segment of a truss forms a triangle, then that truss is:-

A) internally stable B) externally stable
C) internally unstable D) externally unstable
 
Answer & Explanation Answer: A) internally stable

Explanation: A triangular truss is always internally stable, and if all parts of a truss form a triangle then we can say that about the overall truss.

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80
Q:

How many extra equations are possible if 3 hinges are there in a space frame in relation to DSI?

A) 6 B) 9
C) 3 D) 1
 
Answer & Explanation Answer: B) 9

Explanation: Each hinge gives three extra equation in case of planar frame.

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