EEE 304 ACTUAL EXAM PAPER 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ What is the deformation (in in.) when stress is 38 ksi, E is 9,000 ksi, and L =
1.98 in.?.
Answer: 0.0084 in.
◍ On the $\tau$ axis, does it go clockwise or counterclockwise?.
Answer: Clockwise
◍ What is the maximum shear stress calculated from: sigma_x=12300,
sigma_y=-4200, tau_xy=-4700psi?.
Answer: 9495 psi
◍ True or false: Are more grain boundaries desirable for increased yield
strength?.
Answer: TRUE
◍ True or false: Do rough surfaces have a longer fatigue life?.
Answer: FALSE
◍ Name two factors that affect fatigue life..
Answer: Roughness, environment, surface condition, stress concentrations
◍ A material with greater fracture toughness allows for a smaller or larger
critical crack length?.
Answer: Larger
◍ If a large flat plate has a fatigue life of 1.03 x 10^6 cycles, a final crack
length of 34 mm, and a maximum tensile stress of 105 MPa, calculate the
initial crack length (in mm). Assume Y=1, m=3, and A=2.0x10^-12.
Answer: 6.87 mm
◍ What type of bonding results in solids that are hard and brittle?.
, Answer: Ionic
◍ Calculate the composite modulus of elasticity for a unidirectional
carbon-fiber-reinforced plastic that contains 68% carbon fibers and is
stressed under isostrain conditions. The fibers have a tensile modulus of
elasticity of 49x10^6 psi, and the epoxy matrix has a tensile modulus of
4.7x10^5 psi..
Answer: Ec=EfVf + EmVm = 33.47x106 psi (33470.4 ksi)
◍ What effect does strain hardening have on ductility?.
Answer: Decreases
◍ What is stainless steel alloyed with at least 10% of?.
Answer: Chromium
◍ Which failure theory is represented by the failure envelope (hexagonal)?.
Answer: Tresca (maximum shear stress)
◍ True or false: Does alloying increase the yield strength by removing
impurities?.
Answer: FALSE
◍ What material has an endurance limit?.
Answer: Steel
◍ What is the lateral strain when longitudinal strain is 0.12 and Poisson's ratio
is 0.31?.
Answer: -0.0372
◍ True or false: Are composite materials advantageous due to low strength to
density ratio?.
Answer: FALSE
◍ What portion of the stress-strain curve follows strain hardening?.
Answer: Necking
◍ True or false: Does rapid cooling (quenching) of a molten metal increase the
yield strength?.
Answer: TRUE
QUESTIONS WITH ANSWERS GRADED A+
◍ What is the deformation (in in.) when stress is 38 ksi, E is 9,000 ksi, and L =
1.98 in.?.
Answer: 0.0084 in.
◍ On the $\tau$ axis, does it go clockwise or counterclockwise?.
Answer: Clockwise
◍ What is the maximum shear stress calculated from: sigma_x=12300,
sigma_y=-4200, tau_xy=-4700psi?.
Answer: 9495 psi
◍ True or false: Are more grain boundaries desirable for increased yield
strength?.
Answer: TRUE
◍ True or false: Do rough surfaces have a longer fatigue life?.
Answer: FALSE
◍ Name two factors that affect fatigue life..
Answer: Roughness, environment, surface condition, stress concentrations
◍ A material with greater fracture toughness allows for a smaller or larger
critical crack length?.
Answer: Larger
◍ If a large flat plate has a fatigue life of 1.03 x 10^6 cycles, a final crack
length of 34 mm, and a maximum tensile stress of 105 MPa, calculate the
initial crack length (in mm). Assume Y=1, m=3, and A=2.0x10^-12.
Answer: 6.87 mm
◍ What type of bonding results in solids that are hard and brittle?.
, Answer: Ionic
◍ Calculate the composite modulus of elasticity for a unidirectional
carbon-fiber-reinforced plastic that contains 68% carbon fibers and is
stressed under isostrain conditions. The fibers have a tensile modulus of
elasticity of 49x10^6 psi, and the epoxy matrix has a tensile modulus of
4.7x10^5 psi..
Answer: Ec=EfVf + EmVm = 33.47x106 psi (33470.4 ksi)
◍ What effect does strain hardening have on ductility?.
Answer: Decreases
◍ What is stainless steel alloyed with at least 10% of?.
Answer: Chromium
◍ Which failure theory is represented by the failure envelope (hexagonal)?.
Answer: Tresca (maximum shear stress)
◍ True or false: Does alloying increase the yield strength by removing
impurities?.
Answer: FALSE
◍ What material has an endurance limit?.
Answer: Steel
◍ What is the lateral strain when longitudinal strain is 0.12 and Poisson's ratio
is 0.31?.
Answer: -0.0372
◍ True or false: Are composite materials advantageous due to low strength to
density ratio?.
Answer: FALSE
◍ What portion of the stress-strain curve follows strain hardening?.
Answer: Necking
◍ True or false: Does rapid cooling (quenching) of a molten metal increase the
yield strength?.
Answer: TRUE
