Chapter 2 Oral questions Flashcards Preview

A&P Technician GENERAL > Chapter 2 Oral questions > Flashcards

Flashcards in Chapter 2 Oral questions Deck (27):

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 image thumb

A wheelbarrow is what class of lever?

second class

(first class: see-saw, third class: tweezers)

A image thumb

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)

A image thumb

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 are the factors that determine density altitude?

Temperature and atmospheric pressure


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

A image thumb

What is the term that describes the angle between the relative wind and the chord line of an airfoil?

Angle of Attack

A image thumb

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

A image thumb

What are the principle effects that result from lowering the flaps while in flight?

Lift increases, drag increases, and stall speed decreases


What is the function of a wing mounted vortex generator?

They delay or prevent airflow from separating from the upper surface of a wing during high speed flight (prevent boundary layer separation)

A image thumb

How does blade flapping help to compensate for dis-symmetry of lift in helicopter main rotor systems?

Flapping increases the angle of attack and lift on the retreating blade and decreases AOA and lift on advancing blade


How does the airflow through the main rotor of a helicopter change during the transition from normal flight to auto-rotation?


During normal flight air moves downward, in auto-rotation air moves upward


What is friction?

opposition to relative motion between two objects in contact with each other