Math Law Pt.9

The linear portion of the stress-strain diagram of steel is known as the:

• modulus of elongation

• irreversible range

• plastic range

• elastic range

Principal stresses occur on those planes:

• where the shearing stress is zero

• which are 45 degrees apart

• where the shearing stress is a maximum

• which are subjected only to tension

The ratio of the moment inertia of the cross section of a beam to the section modulus is:

• equal to the radius of gyration

• equal to the area of the cross section

• a measure of distance

• multiplied by the bending moment to determine the stress

When an air entrainment agent is introduced into a concrete mix:

• the strength will increase

• the strength will decrease

• the strength will not be affected

• the water/cement ratio must be reduced from 10 - 15%

Structural steel elements subjected to torsion develop:

• tensile stress

• shearing stress

• compressive stress

• bending stress

Which of the following relations defines enthalpy?

• h = u + pV

• h = pV + T

The deflection of a beam is:

• directly proportional to the modulus of elasticity and moment of inertia

• inversely proportional to the modulus of elasticity and length of the beam cubed

• inversely proportional to the modulus of elasticity and moment of inertia

• inversely proportional to the weight and length

The differential of the shear equation is which one of the following?

• load of the beam

• tensile strength of beam

• banding moment of the beam

• slope of the elastic curve

A homogenous round bar of diameter D, length L, and total weight W is hung vertically from one end. If E is the modulus of elasticity, what is the total elongation of the bar?

Which of the following is true for water at reference temperature where enthalpy is zero?

• internal energy is negative

• entropy is non-zero

• specific volume is zero

• vapor pressure is zero