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Basic Physics-DME Oral
General ASA 27 Questions
27
Aviation
09/06/2015

Term
 What are three states of matter?
Definition
 Solids, liquids and gases
Term
 What is the approximate speed of sound on a standard day at sea level?
Definition
 750 miles per hour
Term
 What types of matter are affected by thermal expansion?
Definition
 Solids, liquids and gases
Term
 What is matter?
Definition
 Any substance that occupies space and has weight
Term
 Are liquids compressible?
Definition
 Liquids are usually considered to be incompressible
Term
 What is the basic formula for computing force, given pressure and area?
Definition
 Force=Pressure x Area
Term
 How is pressure expressed in hydraulics and pneumatics?
Definition
 Pounds per square inch
Term
 What type of lever is a wheelbarrow?
Definition
 A second-class lever
Term
 What is standard day temperature in degrees Fahrenheit?
Definition
 59 degrees F
Term
 What factors determine density altitude?
Definition
 Temperature and pressure
Term
 What is the term used to describe the ratio of the amount of water vapor actually present in the atmosphere as compared when the air is saturated with water vapor?
Definition
 Relative humidity
Term
 What direction is pressure transmitted when force is applied to a confined fluid?
Definition
 Equally in all directions
Term
 What are the three basic parts of all levers?
Definition
 Force Fulcrum Resistance
Term
 What are two factors involved in work?
Definition
 Force and movement through a distance
Term
 What is the definition of friction?
Definition
 Resistance to motion
Term
 What are three methods of heat transfer?
Definition
Term
 What is the condition called when the heat energy of a given gas sample is reduced until motion of the molecules would cease entirely?
Definition
 Absolute zero
Term
 What is the atmospheric pressure on a standard day at sea level?
Definition
 14.7 PSI, 29.92 inches of mercury and 1013.2 millibars
Term
 What is kinetic energy?
Definition
 Energy due to motion
Term
 What is a British Thermal Unit?
Definition
 The amount of heat required to change the temperature of one pound of water one degree Fahrenheit
Term
 What does a basic lever machine consist of?
Definition
 A rigid bar, free to pivot on or rotate about a point called the fulcrum
Term
 What are the four principal forces acting on an airplane in flight?
Definition
 Lift, weight, thrust and drag
Term
 What is the angle between the chord line of an airfoil and the direction of the relative wind called?
Definition
 Angle of attack
Term
 What causes an airplane wing to stall?
Definition
 The separation of airflow across the top of the wing from the wings upper surface
Term
 What effects do the lowering of flaps have on an airplane in flight?
Definition
 Increased lift and drag Decreased stall speed
Term
 What change occurs in the flow of air through the main rotor system of a helicopter when transitioning from normal powered flight to auto rotation?
Definition
 It is reversed. In normal powered flight, air is drawn into the main rotor system from above and exhausted downward. During auto rotation, airflow enters the rotor system from below as the helicopter descends
Term
 How does blade flapping help compensate for dissymmetry of lift in helicopter main rotor systems?
Definition
 It serves to increase the angle of attack and lift on the retreating blade side of the rotor and decrease the angle of attack and lift on the advancing blade side
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