Mech P T level Revision 2

Multiple Choice

Which principle ensures that a simply supported beam with a central load splits the load equally between its supports?

• Sum of moments about any point = 0

• Sum of vertical forces = 0

• By symmetry

• Clockwise moments = Anti-clockwise moments

Multiple Choice

What is the value of Ra and Rb for a simply supported beam with a central point load of 10 kN, and how is equilibrium verified?

• Ra = 10 kN, Rb = 0 kN; Ra + Rb = 10 kN

• Ra = 5 kN, Rb = 5 kN; Ra + Rb = 10 kN

• Ra = 6 kN, Rb = 4 kN; Ra + Rb = 10 kN

• Ra = 3 kN, Rb = 7 kN; Ra + Rb = 10 kN

Multiple Select

Which of the following statements about shear force in a simply supported beam with a central point load are correct?

• Shear force is constant on either side of the load.

• Shear force changes sign at the point of load application.

• Shear force diagram is triangular.

• Shear force returns to zero at both supports.

Multiple Choice

What are the key principles that must be satisfied for a simply supported beam to be in static equilibrium?

• Sum of vertical forces equals zero and sum of moments about any point equals zero

• Sum of horizontal forces equals zero and sum of moments about any point equals zero

• Sum of vertical forces equals the applied load and sum of moments equals the reaction forces

• Sum of moments equals the applied load and sum of vertical forces equals the reaction forces

Multiple Choice

Which of the following statements correctly describes how to calculate the support reactions for a simply supported beam with any point load configuration?

• Take moments about each support to find Ra and Rb, and verify by checking Ra + Rb = total load.

• Calculate the area under the bending moment diagram to find support reactions.

• Use conservation of momentum to determine the reactions at the supports.

• Apply the equation W = F × s to determine the support reactions.