Jeppesen A&P General Oral exam (CCC) Questions and answers.

Describe the result of adding a large positive number and a smaller negative number result is smaller positive number, same as ignoring the signs and subtracting smaller number How do you convert a fraction into a decimal? Divide the top number by bottom number What is the key step in order to add or subtract unlike fractions finding the lowest common denominator How do you divide one fraction by another Invert divisor (flip over the second fraction) and multiply both numerators and denominators (top and bottom numbers) How can you convert a decimal into a percent Multiply decimal by 100 and add % sign, or move decimal TWO places to the RIGHT and add % How do you convert a fraction to a percent Convert to decimal, move decimal two places to the right, add % How do you change a decimal to nearest equivalent fraction Multiply decimal by desired denominator, result becomes numerator of fraction (try to get closest to whole number) Two different ways a ratio can be expressed? 1- as a fraction 2- placing a colon between the numbers (5:54) 3- using the word "to" between the numbers What is a proportion? a statement of equality (=) between two or more ratios: 1/2 = 4/8, 45/90 = x/100 What is meant by the root of a number? A root is two or more equal smaller numbers that when multiplied equal the specified number: the second (square) root of 9 is 3, the fifth root of 32 is 2 How do you find the square of a number? Give an example. multiply the number times itself- 4 X 4=16, 10 X 10= 100 What is a common method of making computations involving very large or very small numbers more manageable? Convert the numbers into scientific notation by using powers of 10. (7,234,000= 7.234 X 10^6) How is 100,000 expressed as a power of 10? 10 to the fifth what formula is used to find the area of a rectangle? A=L(length) X W(width) Area of a triangle? 1/2 X B (base) X H (height) Define Pi A constant that expresses the relationship between circumference and diameter of a circle, approximately 3.14159 (number of times the diameter goes into the circumference) Describe a trapezoid A trapezoid is a closed, four-sided figure having two parallel sides and two sides that are not parallel. What is the formula for the area of a circle? A = Pi X Radius squared (radius is half diameter) Define matter Any substance that occupies space and has mass Name three states of matter Solid, Liquid, gas Define kinetic energy the energy of motion Work is the product of what two factors? Force and distance moved (W = F X D) What are the parts of a lever: A rigid bar and a pivot point called the fulcrum A wheelbarrow is what class of lever? second class (first class: see-saw, third class: tweezers) Are all three states of matter affected by thermal expansion? If so, which is affected most? All three are affected, gases are affected the most What is a British Thermal Unit? The amount of heat energy required to change the temperature of 1 pound of water 1 degree Fahrenheit Three methods of heat transfer? Conduction, convection, radiation What term defines the temperature at which all molecular activity stops? Absolute zero Can liquids be compressed? No, liquids are generally considered incompressible What are the units used to express hydraulic or pneumatic pressure Pounds per square inch (PSI) Describe how pressure is transmitted when a force is applied to a confined liquid Pressure is transmitted equally in all directions What formula expresses the relationship between force, pressure, and area Force = Area X Pressure (F over A I P) What is the approximate speed of sound at sea level on a standard day? 661 knots or 340 meters per second What is the atmospheric pressure at sea level on a standard day? 29.92 inches mercury or 1013.2 millibars On a standard day at sea level, what is temperature? 59 degrees Fahrenheit, 15 Celsius What is the term used to describe the ratio between the amount of moisture actually present in the atmosphere compared to the amount the air could hold? Relative Humidity What are the four principle forces acting on an airplane in flight? Lift, Gravity, Thrust, Drag What is the term that describes the angle between the relative wind and the chord line of an airfoil? Angle of Attack What are the factors that cause a wing to stall? when the angle of attack exceeds a critical value and the airflow separates from the upper surface and becomes turbulent What are the principle effects that result from lowering the flaps while in flight? Lift increases, drag increases, and stall spee