TCC Technical Cadet Initial Test common mistakes
TCC Technical Cadet Initial Test · Understand the traps and how to avoid them.
Substituting numbers into a formula while they are still in mixed units, such as using millimetres with metres or minutes with seconds.
The question stem mixes practical units and candidates focus on the numbers rather than the dimensions, so the arithmetic looks right but the result is out by a factor of 10, 60 or 1,000.
What to do instead
Before calculating, write every known value with its unit, convert to a consistent base unit such as metres, seconds, kilograms and amperes, then substitute. Carry units through the calculation and check that the final unit matches what the question asks for.
Confusing mass with weight, diameter with radius, or distance travelled with displacement when selecting a formula.
These quantities are related in everyday language, and timed questions reward recognising a familiar number rather than checking the exact physical quantity named in the stem.
What to do instead
Annotate the question: write m for mass, W for weight, r for radius, d for diameter, s for distance and s with a direction for displacement. Use dimensional analysis to confirm the formula produces the required unit, for example newtons for weight and joules for energy.
Treating a gear or pulley train as if every wheel turns at the same speed, or multiplying tooth counts instead of forming driver-to-driven ratios.
Candidates recognise that gears mesh but do not track how each stage changes speed and torque, and the visual layout makes equal speeds feel plausible.
What to do instead
Label each gear as driver or driven, calculate stage by stage using ratio = driven teeth / driver teeth, and multiply the stage ratios. Track rotation direction at each mesh and state whether the final output is faster with lower torque or slower with higher torque.
Adding resistances directly in a parallel circuit or adding currents directly in a series circuit.
Series rules are learned first and are easier to remember, so candidates apply them to any circuit diagram without first identifying the actual current paths.
What to do instead
Redraw the circuit and trace each current path from the source. Mark components that share the same current as series and components that share the same voltage as parallel. Then apply the correct rule: series resistances add, parallel resistances use reciprocals, series currents are equal, and parallel branch currents add.
Choosing an answer that is generally true about safety or engineering but is not stated or implied in the supplied passage.
Technical comprehension passages contain familiar workplace content, so prior knowledge feels like textual evidence and the candidate stops checking the passage.
What to do instead
For each option, point to the exact sentence that supports it. Reject options that require an assumption not written in the passage, even if they sound correct in real life. If two options seem true, choose the one most directly supported by the wording.
Selecting a tool by its general shape rather than by the fastener or task, for example using an adjustable wrench as a hammer or pliers on a hardened nut.
Tool questions often show familiar workshop items, and candidates match the tool to the nearest visual cue instead of asking what the tool is designed to do and what failure it prevents.
What to do instead
Before choosing, name the task, the material and the force direction. Match the tool to the fastener size and type, check whether the tool is struck, turned or levered, and reject any tool that would damage the fastener, the workpiece or the user.
Accepting the first arrangement or sequence that satisfies most conditions instead of checking every stated constraint.
Logic puzzles create a plausible partial solution early, and time pressure encourages the candidate to stop testing once the arrangement looks consistent.
What to do instead
Write each condition as a separate line, including negative conditions such as not adjacent or not first. Eliminate options that break any single condition, then re-read the final answer against every line before marking it.
Reading dimensions directly off a drawing without using the stated scale, or interpreting a third-angle projection as first-angle.
Drawings look like measured objects, and projection symbols are small and easy to ignore, so candidates treat the printed size as the real size or place views on the wrong side.
What to do instead
Check the title block and projection symbol first. Note the scale and convert every measured dimension using the scale bar or ratio. Confirm view placement by the projection symbol, and check hidden lines and centrelines before calculating any missing dimension.
Rounding intermediate answers to whole numbers or one decimal place and then continuing the calculation.
Mental arithmetic feels cleaner with rounded numbers, and candidates do not realise how much a rounded intermediate value shifts the final answer, especially in multi-step percentage or ratio problems.
What to do instead
Keep exact fractions or at least four significant figures through intermediate steps, round only the final result, and check whether the question asks for a specific number of decimal places or significant figures. Estimate first to catch large errors.
Using sine instead of cosine, or the wrong angle reference, when resolving a force or velocity into components.
Formulas are memorised as opposite over hypotenuse without a diagram, so the candidate cannot tell which side is opposite the chosen angle.
What to do instead
Draw the vector and mark the angle from a clearly labelled reference line, usually the horizontal. Label the side opposite the angle and the side adjacent to it, then write the component along the required direction as F cos theta or F sin theta only after checking the diagram.