EIAT Mechanical Flashcards
7 cards from real EIAT and NEIEP Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 EIAT Mechanical flashcards as text
A belt connects a 4-inch drive pulley spinning at 1,200 RPM to a 12-inch driven pulley. What is the speed of the driven pulley?
Answer: 400 RPM
Speed ratio = drive diameter / driven diameter = 4/12 = 1/3, so 1,200 × (4/12) = 400 RPM.
A spring with a spring constant of 20 lb/in is compressed 3 inches. How much force is required to hold it in the compressed position?
Answer: 60 lb
Hooke's Law: F = k × x = 20 lb/in × 3 in = 60 lb.
Which class of lever has the effort between the fulcrum and the load?
Answer: Third class
A third-class lever has the effort between the fulcrum and load, providing a mechanical advantage less than 1 but greater speed and range of motion.
A pipe with a 4-inch diameter is connected to a pipe with a 2-inch diameter. If water flows at 2 ft/s in the large pipe, how fast does it flow in the small pipe?
Answer: 8 ft/s
Continuity equation: A1×v1 = A2×v2; area ratio is (4²)/(2²) = 4, so v2 = 2 × 4 = 8 ft/s.
What is the primary function of a flywheel in a mechanical system?
Answer: To store rotational kinetic energy and smooth out speed variations
A flywheel stores rotational energy and releases it to maintain constant speed during load variations.
When a bolt is tightened, the threads act as which simple machine?
Answer: Screw (inclined plane wrapped around a cylinder)
A screw is an inclined plane wrapped around a cylinder; rotating it converts rotational motion into linear clamping force.
A first-class lever has a 200 lb load 2 feet from the fulcrum. Where must a 50 lb effort be applied to achieve balance?
Answer: 8 feet from the fulcrum on the opposite side
Torque balance: 200 lb × 2 ft = 50 lb × d, so d = 400/50 = 8 feet.
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