What are the three types of
heat transfer ?
Conduction, Convection, Radiation
What is the
atmospheric
pressure on a standard day
at sea level?
14.7 PSI
or
29.92 inches of Mercury
or
1013.2 milliba
How is pressure expressed
in hydraulic and pneumatics?
PSI
Are liquids compressible ?
No
What types of matter are
affected by
thermal expansion?
Solid, Liquid and Gases.
What is the basic
Pascal´s law formula
for computing force, given
pressure and area?
Force = Pressure x Area
In what direction is
pressure transmitted when force is
applied to a confined fluid?
Equally
in all directions
What are the three states of
matter?
Solid, Liquid and Gases.
What is the term used to
describe the ratio of the amount
of water vapor actually present
in the
atmosphere as compared to when
the air is saturated with
water vapor?
Relative Humidity
On a standard day
temperature in degrees
Fahrenheit/Centigrade?
59°F and 15°C
What factors determine
density altitude ?
Pressure
and
Atmospheric Temperature.
What is the approximate
speed of sound
on a standard day at sea level?
340 Meters/sec. or 661.7 knots.
What is the definition of
friction?
Opposition to the relative movement
between two objects.
What does a basic
lever machine
consist of?
It is a rigid bar
and a pivot point called the fulcrum.
How does blade flapping
help compensate for dissymmetry
of lift in helicopter main rotor
systems?
Serves to increase the angle of attack and lift on the
retaining blade of the rotor and decrease the angle of
attack and the lift on the advancing blade side.
What are the four principal
forces acting on an airplane in
flight?
Lift, Drag, Thrust and Gravity.
What is a
British Thermal Unit?
The amount of heat energy required to
change the temperature of
1 pound of water 1°Fahrenheit.
A wheelbarrow is an
example of what class of lever?
A second-class lever.
What is the angle between
the chord line of an airfoil and the
direction of the relative wind
called?
Angle of
attack.
Define matter?
Any substance that occupies
space and has a mass.
Define kinetic energy:
It is the energy of motion
Work is the product of
what two factors?
Force and the Distance moved
What causes an airplane
Wing to stall?
A stall is caused by the separation of the
airflow across the top of the wing from the
wing upper Surface when the angle
of attack exceeds a critical value.
What effects do the
lowering of flaps have on
an airplane in
flight?
Lift increases,
drag increases and
the stall speed decreases.
