MAE-454 Final Exam Questions WITH CORRECT
ANSWERS 2026
In the design and analysis of a welded connection, how should the weld filler strength be
selected relative to the base material strength? - CORRECT ANSWERS -The filler material
strength should be selected at or slightly above the base material strength.
What is the maximum single pass welding thickness? - CORRECT ANSWERS -A value of 3/8" was
presented in class. Welding codes have 5/16"
What code should be consulted when welding steam lines in a Rankine cycle steam power
plant? - CORRECT ANSWERS -The ASME Boiler code
What is meant by the heat affected zone (HAZ) in welding? - CORRECT ANSWERS -This is the
area around the weldment that has received significant heat and a local temperature rise that
may affect the base material properties.
What is the general designation for welding in a technical drawing? - CORRECT ANSWERS -See
image
For a helical coil compression spring, design recommendations are provided for the parameters
C, Na, ξ, and ns. Provide the recommended value or range for one of these variables. - CORRECT
ANSWERS -4 ≤ C ≤ 12
3 ≤ Na ≤ 15
ξ ≥ 0.15
ns ≥ 1.2
, For a helical coil extension spring, describe the force versus displacement curve where the main
body coils are touching and imparts a preload on the coils. Label the axes. - CORRECT ANSWERS
-(EXACT AWNSER IS NOT ON GRAPH! IMAGE IS GENERAL EXAMPLE OF FORCE VS
DISPLACEMENT PLOT) THE LINEAR CURVE IS TO BE PLACED STARTING AT THE PRELOAD VALUE
WHERE X=0
In the derivation of the stress in a helical coil compression spring, a theoretical stress correction
factor 𝐾𝑆 = 2𝐶+1 2𝐶 was defined. However, this value was replaced by 𝐾𝐵 = 4𝐶+2 4𝐶−3 . Why
was the theoretical "Ks" relationship not used and the "KB" relationship used in its place? -
CORRECT ANSWERS -The KS relationship does not account for the curvature and true shear
stress in the wire. The KB relationship better predicts the true stress.
In the design of helical coil compression springs, how should the spring's operating frequency
be specified relative to the spring's resonant frequency? - CORRECT ANSWERS -Resonant
frequency should be 20 times the operating frequency
In the C10 equation for roller bearings, what does the RD parameter represent? - CORRECT
ANSWERS -The reliability.
What roller element bearing type can only support a radial load? - CORRECT ANSWERS -A
needle or straight cylindrical bearing
At what temperatures should you use grease or oil for lubrication? - CORRECT ANSWERS -If
temperature is lower than 200 degrees f , use grease.
If temperature is above 200 degrees f, use oil.
Gear ratio is defined as: - CORRECT ANSWERS -e = (# Driving tooth)/( # Driven tooth) =
(Nout/Nin) = (Wout/Win)
ANSWERS 2026
In the design and analysis of a welded connection, how should the weld filler strength be
selected relative to the base material strength? - CORRECT ANSWERS -The filler material
strength should be selected at or slightly above the base material strength.
What is the maximum single pass welding thickness? - CORRECT ANSWERS -A value of 3/8" was
presented in class. Welding codes have 5/16"
What code should be consulted when welding steam lines in a Rankine cycle steam power
plant? - CORRECT ANSWERS -The ASME Boiler code
What is meant by the heat affected zone (HAZ) in welding? - CORRECT ANSWERS -This is the
area around the weldment that has received significant heat and a local temperature rise that
may affect the base material properties.
What is the general designation for welding in a technical drawing? - CORRECT ANSWERS -See
image
For a helical coil compression spring, design recommendations are provided for the parameters
C, Na, ξ, and ns. Provide the recommended value or range for one of these variables. - CORRECT
ANSWERS -4 ≤ C ≤ 12
3 ≤ Na ≤ 15
ξ ≥ 0.15
ns ≥ 1.2
, For a helical coil extension spring, describe the force versus displacement curve where the main
body coils are touching and imparts a preload on the coils. Label the axes. - CORRECT ANSWERS
-(EXACT AWNSER IS NOT ON GRAPH! IMAGE IS GENERAL EXAMPLE OF FORCE VS
DISPLACEMENT PLOT) THE LINEAR CURVE IS TO BE PLACED STARTING AT THE PRELOAD VALUE
WHERE X=0
In the derivation of the stress in a helical coil compression spring, a theoretical stress correction
factor 𝐾𝑆 = 2𝐶+1 2𝐶 was defined. However, this value was replaced by 𝐾𝐵 = 4𝐶+2 4𝐶−3 . Why
was the theoretical "Ks" relationship not used and the "KB" relationship used in its place? -
CORRECT ANSWERS -The KS relationship does not account for the curvature and true shear
stress in the wire. The KB relationship better predicts the true stress.
In the design of helical coil compression springs, how should the spring's operating frequency
be specified relative to the spring's resonant frequency? - CORRECT ANSWERS -Resonant
frequency should be 20 times the operating frequency
In the C10 equation for roller bearings, what does the RD parameter represent? - CORRECT
ANSWERS -The reliability.
What roller element bearing type can only support a radial load? - CORRECT ANSWERS -A
needle or straight cylindrical bearing
At what temperatures should you use grease or oil for lubrication? - CORRECT ANSWERS -If
temperature is lower than 200 degrees f , use grease.
If temperature is above 200 degrees f, use oil.
Gear ratio is defined as: - CORRECT ANSWERS -e = (# Driving tooth)/( # Driven tooth) =
(Nout/Nin) = (Wout/Win)
