EIAT and NEIEP Test EIAT Mechanical 4 — Questions and Answers
Question 1: A compound gear train has a first pair with a 2:1 ratio and a second pair with a 4:1 ratio. What is the overall ratio?
- 2:1
- 6:1
- 8:1 (Correct answer)
- 4:1
Correct answer: 8:1
In a compound gear train, multiply the individual ratios: 2 × 4 = 8:1 overall.
Question 2: Which material property describes a material's ability to return to its original shape after a load is removed?
- Plasticity
- Ductility
- Elasticity (Correct answer)
- Malleability
Correct answer: Elasticity
Elasticity is the ability of a material to recover its original shape and size after deforming stress is removed.
Question 3: A centrifugal pump impeller spins faster. What happens to the fluid pressure it produces?
- Pressure decreases
- Pressure stays the same
- Pressure increases (Correct answer)
- Pressure becomes zero
Correct answer: Pressure increases
Higher impeller speed imparts more kinetic energy to the fluid, which converts to greater pressure at the pump outlet.
Question 4: When two shafts must transmit power at a slight angle to each other, which coupling is used?
- Rigid coupling
- Sleeve coupling
- Universal joint (U-joint) (Correct answer)
- Flange coupling
Correct answer: Universal joint (U-joint)
A universal joint allows power transmission between shafts that are not perfectly aligned or are at an angle to each other.
Question 5: A container holds oil (density 0.8) and water (density 1.0). Where does the oil settle?
- At the bottom
- Evenly mixed throughout
- At the top (Correct answer)
- In the middle
Correct answer: At the top
Fluids with lower density float on fluids with higher density, so oil settles above water.
Question 6: A beam is supported at both ends with a load placed at the center. Where is the bending stress greatest?
- At the supports
- At the center of the beam (Correct answer)
- At the top surface of the beam at the quarter-points
- Equally distributed throughout
Correct answer: At the center of the beam
For a simply supported beam with a center point load, maximum bending moment — and therefore maximum bending stress — occurs at the midpoint.
Question 7: Which valve type provides the most gradual and precise flow control in a piping system?
- Gate valve
- Ball valve
- Globe valve (Correct answer)
- Check valve
Correct answer: Globe valve
Globe valves have a plug that moves perpendicular to flow, allowing fine incremental adjustment of flow rate.
EIAT and NEIEP Test EIAT Mechanical 4
A compound gear train has a first pair with a 2:1 ratio and a second pair with a 4:1 ratio.
What is the overall ratio?