- Mechanical advantage of a movable pulley?
- 2 — the load hangs on 2 rope segments, so each carries half the load.
- What is the 'main idea' of a passage?
- The single overall point the whole passage supports — not one detail. Pick the answer choice that covers the entire passage.
- Main idea vs. supporting detail?
- Main idea = what the passage is about (whole). Supporting detail = a fact, number, or example that proves it (one sentence).
- Where is the answer to a POSS reading question?
- Always in the passage itself. Never use outside plant knowledge — answer only from what the text states or implies.
- How do you answer a 'specific detail' question fast?
- Scan back to the exact sentence that states the fact rather than relying on memory; the answer is one line, not the whole passage.
- What is an inference question asking for?
- Something the passage implies but does not state outright. Choose the conclusion the text supports — reject anything not backed by these words.
- Common trap on inference questions?
- A choice that is true in the real world but NOT supported by the passage. Pick what the text backs, not what merely sounds reasonable.
- How do you find the meaning of a word in context?
- Use the surrounding sentence. Substitute each answer choice into the sentence and keep the one that preserves the meaning.
- Why read the question before rereading the passage?
- It tells you whether you need the gist (main idea) or one buried fact (detail), so you skim or hunt accordingly — saving time on the clock.
- How long is the POSS Reading Comprehension test?
- 36 questions in 30 minutes — five passages, each followed by several multiple-choice questions.
- What kind of passages appear on POSS reading?
- Technical material like power-plant operator training and safety manuals — but no outside knowledge is required to answer.
- How do you follow a written procedure on a reading item?
- Track the ORDER of steps (first, then, before, until) and any 'if/then' conditions that change what to do.
- What do sequence words signal in a procedure?
- Order and timing: first, then, next, before, after, until, unless. Underline them to keep the steps straight.
- How do you find a passage's purpose or 'best title'?
- Choose the option that covers the whole passage. A title that fits only one paragraph is too narrow; one beyond the text is too broad.
- Should you skim or read closely on POSS reading?
- Skim for the gist first, then read closely only the part a question points to. The 30-minute clock rewards targeted rereading.
- What is a 'conclusion' question?
- It asks what logically follows from the passage. Choose the statement the passage's facts support — not an unsupported guess.
- How do you handle a passage with lots of numbers?
- Don't memorize them. Note where each value is, then scan back to the exact figure a question asks about.
- Fact vs. opinion in a passage?
- A fact can be verified from the text; an opinion is the author's judgment. Detail questions usually target facts.
- What does 'according to the passage' tell you?
- Answer strictly from the text — the correct choice is stated in or directly supported by the passage, not by outside knowledge.
- How do you eliminate wrong reading answers?
- Drop choices that contradict the text, go beyond it, or are too extreme. The right answer is supported and on-scope.
- Why is rereading the question stem important?
- It prevents answering the wrong question — confusing the main idea with a detail, or a cause with an effect.
- Can you use a calculator on POSS Mathematical Usage?
- No. All math is done by hand, so practice mental math, unit conversions, and clean arithmetic.
- Formula for percentage increase?
- Change ÷ original × 100. From 150 to 180: change 30, 30 ÷ 150 = 0.20 = 20%.
- Do you divide by the original or new value for percent change?
- Always the ORIGINAL (starting) value. Dividing by the new value is the most common mistake.
- How do you find a percent of a number?
- part = percent × whole. Turn the percent into a decimal first: 25% of 80 = 0.25 × 80 = 20.
- How do you solve a proportion?
- Set the two ratios equal as fractions and cross-multiply: a/b = c/d means a × d = b × c.
- 3 operators monitor 9 machines — how many for 45?
- Ratio is 1:3, so 45 ÷ 3 = 15 operators.
- Formula for distance, rate, and time?
- distance = rate × time. Rearranged: rate = distance ÷ time, time = distance ÷ rate.
- How do you find average speed?
- Total distance ÷ total time. 120 km in 1.5 h = 120 ÷ 1.5 = 80 km/h.
- Convert minutes to hours.
- Divide by 60. 90 minutes = 90 ÷ 60 = 1.5 hours.
- Convert ¾ to a percent.
- Divide then multiply by 100: 3 ÷ 4 = 0.75 = 75%.
- Convert 25% to a decimal.
- Divide by 100: 25 ÷ 100 = 0.25.
- Convert liters to cubic meters.
- Divide by 1,000. 300 L/min × 120 min = 36,000 L = 36 m³.
- ½ as a decimal and percent?
- 0.5 and 50%.
- ¼ as a decimal and percent?
- 0.25 and 25%.
- ⅕ as a decimal and percent?
- 0.2 and 20%.
- ⅛ as a decimal and percent?
- 0.125 and 12.5%.
- ⅓ as a decimal and percent?
- 0.333… ≈ 33%.
- How do you fill a quarter of a 600 L tank at 20 L/min?
- A quarter of 600 = 150 L. Time = 150 ÷ 20 = 7.5 minutes.
- Order of operations?
- Parentheses, then exponents, then multiply/divide (left to right), then add/subtract (left to right).
- How do you plug values into a given formula?
- Match each value to its spot, convert units so they agree, then compute in order. The POSS gives you the formula.
- Why estimate before solving a math item?
- A ballpark answer makes an obviously wrong choice (often from a unit slip) easy to spot before you commit.
- Solve 6x + 12 = 48 for x.
- Subtract 12: 6x = 36. Divide by 6: x = 6.
- How do you check units match before computing?
- Convert so the units agree (minutes↔hours, inches↔feet, liters↔m³). Many POSS math items hinge on one conversion.
- Ratio 5:3 of A to B, with 40 kg of B — how much A?
- 5/3 = A/40, so A = 5 × 40 ÷ 3 ≈ 66.67 kg.
- How do you split a total evenly?
- Total ÷ number of parts. 320 tons over 8 cars = 40 tons each.
- Coal: 320 tons/day for 7 days, 40 tons/car — how many cars?
- 320 × 7 = 2,240 tons; 2,240 ÷ 40 = 56 cars.
- Net fill rate: inflow 100 L/min, outflow 75 L/min?
- Net = 100 − 75 = 25 L/min added.
- What is the ratio of circumference to diameter of any circle?
- π ≈ 3.14159. Circumference = π × diameter.
- Area of a rectangle?
- length × width.
- Area of a triangle?
- ½ × base × height.
- How do you find what percent one number is of another?
- Divide the part by the whole and multiply by 100. 30 is what % of 150? 30 ÷ 150 × 100 = 20%.
- Turbine output 150 MW → 180 MW: percent increase?
- Change 30 MW ÷ original 150 = 0.20 = 20% increase.
- What is mechanical advantage?
- How much a machine multiplies your effort: load ÷ effort. An MA of 4 means a 1 lb effort balances a 4 lb load.
- Mechanical advantage of a fixed pulley?
- 1 — it only changes the direction of the force, saving no effort.
- How do you find a pulley system's mechanical advantage?
- Count the rope segments that actually support the load — that number is the MA.
- Effort to lift a 300 lb load with a movable pulley?
- 150 lb — the load is shared by 2 supporting rope segments (300 ÷ 2).
- Effort to lift 300 lb with a 4-segment block and tackle?
- 75 lb — 300 ÷ 4 supporting rope segments.
- What does a machine never give you for free?
- Work. What you save in force you pay back in distance — more rope to pull, a longer push, etc.
- State the law of the lever.
- effort × effort-arm = load × load-arm. A longer effort arm multiplies your force.
- What is a fulcrum?
- The fixed pivot point a lever turns on. Its position defines the lever's class.
- Class 1 lever — what's in the middle, and an example?
- Fulcrum in the middle. Seesaw, crowbar, pliers — can multiply force or just change direction.
- Class 2 lever — what's in the middle, and an example?
- Load in the middle. Wheelbarrow, bottle opener — always multiplies force (MA > 1).
- Class 3 lever — what's in the middle, and an example?
- Effort in the middle. Tweezers, your forearm — trades force for speed and range (MA < 1).
- What is the gear ratio?
- Driven-gear teeth ÷ driver-gear teeth. 30 teeth ÷ 10 teeth = 3:1.
- Which way do two externally meshed gears turn?
- Opposite directions. An idler gear between them reverses direction but doesn't change the ratio.
- How do gears trade speed and torque?
- More teeth = slower rotation but more torque. A 3:1 gear turns one-third the speed with three times the torque.
- What does a gear reducer do?
- Decreases output speed and increases torque — turning a fast, low-torque motor into slow, high-torque output.
- What is torque?
- A turning or twisting force. Slowing rotation increases available torque.
- State Pascal's principle.
- A pressure change in a confined fluid is transmitted equally throughout it — the basis of hydraulics.
- Formula relating pressure, force, and area?
- Pressure = force ÷ area (P = F ÷ A). Rearranged: force = pressure × area.
- How does a hydraulic system multiply force?
- Pressure is equal throughout the fluid, so a larger output piston (more area) makes a larger force: F = P × A.
- 50 lb on a 2 in² piston — what pressure?
- P = F ÷ A = 50 ÷ 2 = 25 psi throughout the fluid.
- 25 psi on a 20 in² output piston — what force?
- F = P × A = 25 × 20 = 500 lb.
- What are pneumatics?
- Using compressed air or gas to transmit force or do work — like hydraulics but with a compressible fluid.
- What does an air dryer remove in a pneumatic system?
- Moisture from the compressed air before it enters the system.
- Formula for work?
- Work = force × distance.
- What is friction?
- The resistance force when two surfaces move against each other. It causes wear and heat and wastes energy.
- Why do bearings reduce friction?
- They replace sliding contact with rolling contact (balls/rollers) or a lubricant film, so far less surface drags.
- Rolling vs. sliding friction?
- Rolling friction is much smaller, which is why ball and roller bearings cut energy loss sharply.
- What does a flywheel do?
- Stores rotational (kinetic) energy and releases it smoothly, evening out an engine's power delivery.
- What is the primary function of a condenser in a steam plant?
- To convert steam back to water (condense it) so it can be reused.
- What happens if a belt-driven machine runs too fast?
- Increased belt slippage — the belt can't grip and transmit power reliably.
- What converts hydraulic energy into mechanical motion?
- A hydraulic motor — it turns fluid pressure and flow into rotating mechanical output.
- What does a torque converter do?
- Transfers rotational power from the engine to the transmission, allowing smooth power transfer in an automatic.
- What is the main function of a pump?
- To move fluid by adding energy to it — raising its pressure or moving it through piping.
- Effect of increasing a hydraulic cylinder's area at constant pressure?
- Output force increases — force is proportional to area (F = P × A).
- What does increasing area do to pressure for the same force?
- It lowers pressure — pressure = force ÷ area, so more area means less pressure.
- How does a longer effort arm help on a lever?
- It multiplies your force — you trade a longer push for a larger output force.
- Two meshed gears, one twice the diameter: smaller gear's speed and torque?
- Speed increases, torque decreases — the smaller gear spins faster with less torque.
- Why does a sharp tip pierce while a flat foot doesn't?
- Pressure = force ÷ area; a tiny tip area concentrates the same force into very high pressure.
- What balances a beam being lifted by a cable?
- Hook the cable at the center of gravity so the beam stays level — weight is balanced on each side of the lift point.
- How long is the POSS Figural Reasoning test?
- 20 questions in 10 minutes — Picture Series, Picture Comparison, and Picture Progression items.
- What is the core skill in figural reasoning?
- Isolating the ONE rule that changes from figure to figure, then applying it again to predict the next figure.
- What is a picture series?
- Figures that change by a consistent rule from one to the next; you pick the figure that comes next.
- What does a rotation do to a figure?
- Turns it around a center point. A 90° clockwise turn moves up→right→down→left.
- What does a reflection do to a figure?
- Flips it across a line into a mirror image, reversing left and right.
- Rotation vs. reflection — the key difference?
- A rotation keeps handedness; a reflection reverses left and right. The classic trap is a mirror image when only a turn was applied.
- After four 90° clockwise turns, where is a figure?
- Back at its starting orientation — four 90° turns make a full 360° circle.
- Triangle points up, rotates 90° CW each step — direction on step 5?
- Right. Up→right(1)→down(2)→left(3)→up(4)→right(5).
- What are the common figural transformations?
- Rotation, reflection, adding/removing an element, and changing count or size.
- How do you handle two changes at once in a series?
- Track each change (e.g. rotation AND an added dot) separately, then apply both to the next figure.
- Pattern repeats every 3 shapes — what's the 7th shape?
- 7 ÷ 3 leaves remainder 1, so the 7th matches the 1st shape in the cycle.
- How do you track a rotating shape reliably?
- Pick a reference point (an arrow's tip or a marked corner) and step it through the rotation one move at a time.
- What is a 'count change' transformation?
- The number of items (dots, lines, sides) increases or decreases by a steady amount each step.
- What is a 'size change' transformation?
- The figure grows or shrinks by a consistent step — track the direction of the change.
- How do you find the odd figure out?
- Identify the rule the others share, then pick the one figure that breaks it.
- What is Picture Comparison?
- A figural item asking how two figures relate — what changed (rotation, reflection, added element) between them.
- What is Picture Progression?
- A figural item where figures change step by step by a rule; you continue the rule to the next figure.
- 180° rotation of an up-arrow?
- It points down — a half turn reverses the direction.
- How is figural reasoning like a number series?
- Both reward finding a consistent rule and applying it one more step — repeating cycles, steady counts, or steady changes.
- Why does practice help figural reasoning most?
- It tests reasoning, not memorized facts — so training your eye to spot the single rule builds the biggest gains.
- Reflected letter vs. rotated letter?
- A reflected letter is reversed (mirror image); a rotated letter keeps its handedness, just turned.
- First step when a figure series looks complex?
- Compare just the first two figures and name the single change before looking at later figures or the choices.
- What is a topic sentence?
- The sentence (often first) that states a paragraph's main point; the rest of the paragraph supports it.
- How do you summarize a passage in one line?
- Combine the main idea with the most important supporting point — 'X happens because/so that Y.'
- What does 'imply' mean on a reading question?
- To suggest without stating directly. An implied idea is supported by the text but not written word-for-word.
- Cause vs. effect in a passage?
- A cause makes something happen; an effect is the result. Signal words: because, since, so, therefore, as a result.
- How do you handle a long passage under time pressure?
- Read the first and last sentences of each paragraph for structure, then dive into detail only where a question points.
- What is the author's tone?
- The attitude the writing conveys (neutral, cautionary, informative). Technical POSS passages are usually neutral and factual.
- How do you answer 'which statement is true according to the passage'?
- Match each choice against the text; the correct one is stated or directly supported, the rest contradict or overreach.
- Why underline numbers and names while reading?
- So you can jump straight back to them when a detail question asks for a specific figure or term.
- What is a supporting example used for?
- To illustrate or prove the main idea with a concrete case; it backs the point but is not the point itself.
- How do you spot an unsupported answer choice?
- It adds information the passage never mentions, or pushes a claim further than the text does.
- What does 'context clue' mean?
- Nearby words that hint at an unfamiliar word's meaning — a definition, example, or contrast in the same sentence.
- How do you read a step-by-step safety procedure?
- Note the order and any warnings/conditions; a step done out of order or ignoring a condition is the wrong answer.
- Best strategy when two reading choices seem close?
- Re-read the exact line in the passage; the better answer is the one the text more directly supports.
- What is the difference between 'all,' 'some,' and 'most' in a passage?
- They set scope. A choice saying 'all' is wrong if the passage only supports 'some' — watch absolute words.
- Convert hours to minutes.
- Multiply by 60. 1.5 hours = 90 minutes.
- Convert feet to inches.
- Multiply by 12. 3 feet = 36 inches.
- Convert cubic meters to liters.
- Multiply by 1,000. 36 m³ = 36,000 L.
- ⅖ as a decimal and percent?
- 0.4 and 40%.
- ⅗ as a decimal and percent?
- 0.6 and 60%.
- 10% of a number — quick trick?
- Move the decimal one place left. 10% of 250 = 25.
- 5% of a number — quick trick?
- Half of 10%. 10% of 250 = 25, so 5% = 12.5.
- 20% of a number — quick trick?
- Double 10%. 10% of 250 = 25, so 20% = 50.
- Percent decrease from 200 to 150?
- Change 50 ÷ original 200 = 0.25 = 25% decrease.
- Average (mean) of a set of values?
- Sum of values ÷ count of values.
- How do you reverse distance = rate × time for time?
- time = distance ÷ rate.
- How do you reverse distance = rate × time for rate?
- rate = distance ÷ time.
- Net rate when filling and draining at once?
- Inflow rate − outflow rate. Positive = filling, negative = draining.
- Tank drains at 25 L/min net, holds 6,000 L — time to empty?
- 6,000 ÷ 25 = 240 minutes.
- Flow 300 L/min for 2 hours — total liters?
- 300 × 120 min = 36,000 L.
- Cross-multiply 3/9 = x/45.
- 9x = 3 × 45 = 135, so x = 15.
- Simplify the ratio 9:45.
- Divide both by 9: 1:5.
- Perimeter of a rectangle?
- 2 × (length + width).
- Convert a decimal to a percent.
- Multiply by 100. 0.35 = 35%.
- Find 75% of 80.
- 0.75 × 80 = 60.
- What is a unit rate?
- A rate per single unit — e.g. liters per minute, miles per hour, dollars per item.
- How do you check a math answer is reasonable?
- Re-read what was asked and confirm your number answers it, in the right units, before selecting.
- Solve 2x − 4 = 10.
- Add 4: 2x = 14. Divide by 2: x = 7.
- What does 'per' usually signal in a word problem?
- Division — 'liters per minute' means liters ÷ minutes; 'cost per item' means cost ÷ items.
- Mixture ratio 2:3, total 50 kg — how much of each?
- 5 parts total: each part 10 kg, so 20 kg and 30 kg.
- Convert 1.5 hours to minutes, then to seconds.
- 1.5 h × 60 = 90 min; 90 × 60 = 5,400 seconds.
- What is a simple machine?
- A basic device that changes the size or direction of a force: lever, pulley, wheel-and-axle, inclined plane, wedge, and screw.
- What is an inclined plane?
- A ramp — it lets you raise a load with less force over a longer distance (trading force for distance).
- What is a wedge?
- Two inclined planes back to back; it splits or lifts by converting a push into sideways force (axe, chisel).
- What is a screw?
- An inclined plane wrapped around a cylinder; it converts rotation into linear force (jacks, bolts).
- What is a wheel and axle?
- A large wheel fixed to a smaller axle; turning the wheel multiplies force at the axle (or vice versa).
- What is Newton's first law (inertia)?
- An object stays at rest or in motion unless acted on by a net force.
- What is Newton's second law?
- Force = mass × acceleration (F = ma). More force or less mass means more acceleration.
- What is Newton's third law?
- For every action there is an equal and opposite reaction.
- What is the center of gravity?
- The point where an object's weight is balanced. Supporting it there keeps the object level and stable.
- What makes an object more stable?
- A low center of gravity and a wide base — it's harder to tip.
- What is potential energy?
- Stored energy due to position or condition — a raised weight or a compressed spring.
- What is kinetic energy?
- Energy of motion. A moving or rotating object (like a flywheel) carries kinetic energy.
- How does a spring store energy?
- By compressing or stretching; it stores potential energy and pushes back toward its rest length (Hooke's law).
- What is a valve's job?
- To control the flow of a fluid — open, close, or throttle flow in a pipe or system.
- What is a check valve?
- A valve that allows flow in only one direction, preventing backflow.
- What does a motor do?
- Converts energy (electrical or hydraulic) into rotating mechanical motion.
- What does a generator do?
- Converts mechanical motion into electrical energy — the reverse of a motor.
- What is a bearing's purpose?
- To support a rotating shaft while reducing friction so it turns freely.
- What is mechanical advantage of an inclined plane?
- Length of the ramp ÷ its height — a longer, gentler ramp needs less force.
- Why is a longer wrench easier to turn a bolt?
- More effort-arm (leverage) multiplies your torque for the same hand force.
- What happens to torque when you increase the lever arm?
- Torque increases — torque = force × distance from the pivot.
- What is friction's effect on a machine's efficiency?
- It wastes input energy as heat, so output work is always less than input work.
- How does lubrication help machinery?
- It forms a film between surfaces, reducing friction, wear, and heat, and carries heat away.
- What is a pulley used for besides advantage?
- Changing the direction of a force — a fixed pulley lets you pull down to lift a load up.
- Two gears: driver 20 teeth, driven 60 teeth — ratio and speed?
- Ratio 3:1; the driven gear turns one-third the speed with three times the torque.
- What is the function of a flywheel during a load spike?
- Its stored rotational energy briefly supplies extra torque to carry the machine through the spike.
- What is hydraulic pressure transmitted by?
- An (effectively) incompressible confined liquid, which passes the pressure equally everywhere (Pascal's principle).
- Why is air used in pneumatics but liquid in hydraulics?
- Air is compressible (springy, lighter duty); liquid is nearly incompressible, giving stiffer, higher-force control.
- What is a condenser's role in the steam cycle?
- It cools and condenses spent steam back to water so the feed pump can reuse it.
- What is belt tension's job in a belt drive?
- Enough tension lets the belt grip the pulleys and transmit power without slipping.
- What causes a belt to slip?
- Too little tension, an overloaded or over-speeded drive, or worn/greasy surfaces reduce grip.
- What is the relationship between work, force, and distance?
- Work = force × distance. Doing the same work with less force requires more distance.
- What does a larger piston area do at the same pressure?
- Produces a larger force, since force = pressure × area.
- 90° counterclockwise rotation of an up-arrow?
- It points left — a quarter turn the other way.
- 270° clockwise rotation equals what?
- The same as a 90° counterclockwise turn.
- How do you predict the next size in a shrinking series?
- Find the steady step (e.g. each shape one size smaller) and apply it once more.
- Circles added inside each step, starting with 1 — count at frame 5?
- 5 circles — one new circle per frame.
- How do you handle alternating colors (black, white, black…)?
- Continue the alternation; an even or odd position tells you the color of the next figure.
- Row alternates black/white starting black — color of the 7th?
- Black — odd positions (1,3,5,7) are black.
- Square splits into 4 smaller squares each step — what changes?
- The count of squares grows; track how many and any color or shading pattern.
- Pentagon rotates 72° clockwise each step — why 72°?
- A pentagon has 5 vertices; 360° ÷ 5 = 72°, so it looks the same again after 5 steps.
- Shape flips horizontally then vertically alternately — net of both?
- A horizontal flip then a vertical flip equals a 180° rotation.
- Arrow moves one step clockwise and its tail lengthens — track what?
- Two changes: direction (clockwise step) and tail length (longer each step). Apply both.
- What is the fastest way to compare two figures?
- Overlay them mentally and note the single difference — rotation, reflection, or an added/removed element.
- How do you avoid the mirror-image trap?
- When the rule is a rotation, eliminate any mirror-image (flipped) choice first.
- Shape moves one position clockwise and grows each step — next position from top-left?
- Top-right (one clockwise step) and one size larger.
- What if a figure series has no rotation or reflection?
- Look for added/removed elements or a count/size change instead.
- Why count vertices or sides in a figural item?
- A steady increase or decrease in sides/vertices is a common progression rule.
- How many 90° steps return a shape to start?
- Four — 4 × 90° = 360°.
- What does 'progression' mean in figural reasoning?
- A steady, rule-based change from one figure to the next that you extend to find the answer.
- Two squares nested, inner one shaded — what to track?
- Track the shading/color pattern of the inner shape and any size or rotation change.
