TCC Technical Cadet Initial Test flashcards
TCC Technical Cadet Initial Test · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- 3-4-5 right triangle
- A right triangle whose two shorter sides are 3 and 4 units has a hypotenuse of 5 units. Any whole-number multiple, such as 6-8-10, is also right-angled.
- Percentage change formula
- Percentage change equals the new value minus the old value, divided by the old value, then multiplied by 100. A negative result indicates a decrease.
- Mean and median
- The mean is the sum of all values divided by how many values there are. The median is the middle value once the data is arranged in order of size.
- Standard index form
- A number written as a value between 1 and 10 multiplied by a power of ten. For example, 4500 is written as 4.5 × 10³.
- Newton's second law
- The net force on an object equals its mass multiplied by its acceleration, F = ma. Force is in newtons when mass is in kilograms and acceleration in metres per second squared.
- Moment of a force
- The turning effect of a force about a pivot, calculated as the force multiplied by the perpendicular distance from the pivot. The unit is the newton metre.
- Kinetic energy formula
- Kinetic energy equals one half multiplied by mass multiplied by velocity squared, KE = ½mv². Doubling the speed of a moving object quadruples its kinetic energy.
- Pressure on a surface
- Pressure equals force divided by the area over which it acts, P = F/A. It is measured in pascals, where one pascal is one newton per square metre.
- Gear ratio
- The number of teeth on the driven gear divided by the number on the driving gear. A larger driven gear turns more slowly but delivers greater torque.
- Movable pulley advantage
- A single movable pulley supports the load on two rope sections, giving a mechanical advantage of 2, so half the load force is needed to hold it.
- Third-class lever
- A lever where the effort is applied between the fulcrum and the load, such as tweezers. It always has a mechanical advantage of less than one.
- Crossed belt drive
- In a crossed belt drive the belt forms a figure eight, so the driven pulley rotates in the opposite direction to the driving pulley.
- Ohm's law
- The voltage across a resistor equals the current through it multiplied by its resistance, V = IR. It applies to conductors held at a constant temperature.
- Resistors in parallel
- The reciprocal of the total resistance equals the sum of the reciprocals of the individual resistances. The total is always smaller than the smallest individual resistor.
- Silicon diode forward voltage
- A silicon diode begins to conduct strongly once the forward voltage reaches about 0.7 volts. A germanium diode conducts at roughly 0.3 volts instead.
- Resistor colour code order
- Black, brown, red, orange, yellow, green, blue, violet, grey and white represent the digits 0 to 9. Gold and silver mark tolerances of 5 and 10 percent.
- Active and passive voice
- In active voice the subject performs the action, as in 'the fitter replaced the bearing'. In passive voice the subject receives it: 'the bearing was replaced'.
- its and it's
- 'Its' is the possessive form meaning belonging to it and takes no apostrophe. 'It's' is a contraction of 'it is' or 'it has'.
- Cause and effect connectives
- Words such as because, since, therefore, hence, consequently and as a result link a cause to its effect, helping a reader follow technical reasoning.
- Imperative instructions
- Instructions usually begin with the verb, as in 'isolate the supply'. The subject 'you' is omitted, which keeps each step short and unambiguous.
- Class B fire
- A fire involving flammable liquids such as petrol, oil or paint. It is extinguished with foam, dry powder or carbon dioxide, never with a water jet.
- Hacksaw blade selection
- Blades with 14 to 18 teeth per inch suit thick sections and soft metals. Blades with 24 or more teeth per inch suit thin tube and hard material.
- Mild steel properties
- A low-carbon steel containing roughly 0.1 to 0.3 percent carbon. It is ductile, weldable and inexpensive but cannot be hardened by heat treatment.
- Vernier calliper resolution
- A typical metric vernier calliper reads to 0.02 millimetres, while an imperial version often reads to one thousandth of an inch.
- Contrapositive
- For any statement 'if A then B', the contrapositive 'if not B then not A' is logically equivalent. The converse 'if B then A' is not equivalent.
- Combined working rate
- If two people or machines complete a job alone in a hours and b hours, working together they take ab divided by (a + b) hours.
- Two-set Venn total
- The number in either of two overlapping groups equals the first count plus the second count minus the number in both. Counts outside both are added separately.
- Differences in number series
- First examine the gaps between consecutive terms. If the gaps follow a pattern such as +3, +5, +7, the next gap continues that rule.
- Third-angle projection
- A drawing layout where each view is placed on the same side as the viewer, so the top view sits above the front view. Common in the United States and Canada.
- Hidden detail line
- A short-dashed line showing an edge that exists but cannot be seen from the viewing direction. The dashes are evenly spaced and of equal length.
- Isometric drawing axes
- Three axes spaced 120 degrees apart, with the vertical axis upright and the other two at 30 degrees to the horizontal. All are drawn to the same scale.
- Scale 1:50
- One unit measured on the drawing represents 50 of the same units on the real object. A 20 millimetre line therefore represents 1000 millimetres, or one metre.