CIVILEZY CIVIL WAR PWD DAY 2-(TYPES OF BEAMS AND SUPPORTS)

Which type of support does not permit both translation and rotation?

• Fixed support
• Hinged support
• Roller support
• Internal hinge

Answer explanation

A fixed support completely restrains the beam, preventing both translation and rotation. Hence it offers three reactions (2 forces and 1 moment).

In a hinged (pinned) support, which reactions are generated?

• Two reaction forces
• One reaction force
• One reaction moment
• Three reactions

Answer explanation

it develops only two reaction forces (horizontal and vertical), but no moment.

Which type of beam has one end fixed and the other free?

• Continuous beam
• Simply supported beam
• Cantilever beam
• Fixed beam

Answer explanation

A cantilever beam is rigidly fixed at one end and free at the other, allowing it to resist shear, moment, and deflection at the fixed end.

For a simply supported beam, the ends are:

• Both fixed
• Free at both ends
• Resting freely on supports
• One fixed, one free

Answer explanation

A simply supported beam rests freely on supports at its ends, providing only vertical reactions without moments.

Which type of load is assumed to act at the centroid of a rectangle?

• Point load
• Uniformly Distributed Load (UDL)
• Uniformly Varying Load (UVL)
• Couple

Answer explanation

For analysis, a uniformly distributed load is replaced by an equivalent point load acting at the centroid of the loaded span, i.e., midspan.

For a triangular UVL, the total load is assumed to act at:

• Midpoint of the beam
• 1/2 of the beam length from left
• 2/3 of the beam length from left
• At the support

Answer explanation

The equivalent load of a triangular UVL equals the area of the triangle, and its line of action passes through the centroid, located at 2/3 of the length from the smaller end.

Which beam has more than two supports?

• Overhanging beam
• Continuous beam
• Fixed beam
• Propped cantilever

Answer explanation

A continuous beam extends over more than two supports, unlike simply supported or cantilever beams.

The shear force at a section is defined as:

• Sum of vertical reactions only
• Algebraic sum of all forces on either side of the section
• Sum of horizontal forces
• Difference between bending moments

Answer explanation

Shear force at a section is the algebraic sum of all vertical forces to the left or right of the section.

The bending moment at a section is:

• Sum of all loads on the beam
• Algebraic sum of moments of all forces about that section
• Sum of shear forces only
• Always zero

Answer explanation

The bending moment is calculated as the algebraic sum of the moments of all loads and reactions about the section.

Which support allows one translation and one rotation, providing only one reaction force?

• Fixed support
• Hinged support
• Roller support
• Internal hinge

Answer explanation

A roller support permits rotation and translation along the surface, producing only one vertical reaction force perpendicular to the surface.