MAE 277 QUIZ 5

What is the strain of a 6-m long wire with a diameter of 1.5 mm that stretches by 3 mm when a load is applied? 1. 2x10^3 2. 2x10^-4 3. 0.5 4. 5x10^-4

5x10^-4

Which of these statements correctly describes Hooke's Law? 1. Extension is directly proportional to load in the plastic region. 2. Extension is directly proportional to force in the elastic region. 3. Extension is inversely proportional to the Poisson's ratio. 4. Extension is directly proportional to the spring constant.

Extension is directly proportional to force in the elastic region.

Brittle metals, unlike ductile metals, exhibit a considerably large plastic deformation before sudden failure. 1. True 2. False

False

Having an ultimate strength greater than that of the applied stress will prevent yielding. 1. True 2. False

False

Which point/limit is the odd one out in the following list? 1. Elastic Limit 2. Proportional limit 3. Fracture point 4. Yield Point

Fracture Point

A(n) __ is an engineered material made from two or more constituent metals which do not remain separate and distinct on a macroscopic level. 1. composite 2. elastomer 3. ceramic 4. alloy

alloy

A rod which undergoes plastic deformation will __. 1. return to its original shape when the applied force is removed 2. become permanently deformed 3. approach its elastic limit if the force is not removed 4. show a linear stress-strain relationship

become permanently deformed

A loading situation where an attachment is stressed in shear across two loaded planes simultaneously is known as __. 1. double plane loading 2. double shear loading 3. transverse double loading 4. single shear loading

double shear loading

Which of the following parameters is not dimensionless? 1. rod stiffness 2. poissons ratio 3. strain 4. factor of safety

rod stiffness

The yield point in a stress-strain graph of a wire represents __. 1. the point when the wire breaks 2. the point when the wire stats to undergo plastic deformation 3. the point where yield strength in the wire is at its maximum 4. the point when yielding int he wire stops

the point when the wire stats to undergo plastic deformation