JEPPESEN A&P GENERAL ORAL EXAM (CCC)
Questions and answers Latest Updates 2025
GRADED A+
What term defines the temperature at which all molecular activity stops? - answer Absolute zero
Can liquids be compressed? - answer No, liquids are generally considered incompressible
What are the units used to express hydraulic or pneumatic pressure - answer Pounds per square inch
(PSI)
Describe how pressure is transmitted when a force is applied to a confined liquid - answer Pressure is
transmitted equally in all directions
What formula expresses the relationship between force, pressure, and area - answer Force = Area X
Pressure (F over A I P)
What is the approximate speed of sound at sea level on a standard day? - answer 661 knots or 340
meters per second
What is the atmospheric pressure at sea level on a standard day? - answer 29.92 inches mercury or
1013.2 millibars
On a standard day at sea level, what is temperature? - answer 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? - answer Relative Humidity
What are the four principle forces acting on an airplane in flight? - answer Lift, Gravity, Thrust, Drag
,What is the term that describes the angle between the relative wind and the chord line of an airfoil? -
answer Angle of Attack
What are the factors that cause a wing to stall? - answer 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? - answer Lift increases,
drag increases, and stall speed decreases
What is the function of a wing mounted vortex generator? - answer They delay or prevent airflow from
separating from the upper surface of a wing during high speed flight (prevent boundary layer separation)
How does blade flapping help to compensate for dis-symmetry of lift in helicopter main rotor systems? -
answer 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? - answer During normal flight air moves downward, in auto-rotation air moves
upward
What is friction? - answer opposition to relative motion between two objects in contact with each other
One kilowatt is equal to how many watts? - answer 1,000
What law describes the basic relationships in an electrical circuit? - answer Ohm's law
What are the three elements of Ohm's law? - answer Voltage, Current, Resistance
How would you write Ohm's law as an equation? - answer E= I X R, R=E/I, I=E/R
, If the resistance in a DC circuit remains the same but the voltage doubles, what happens to the amount
of current flowing in the circuit? - answer It also doubles
In DC circuits, what unit measures power? - answer Watts
What three elements are required to form an electrical circuit? - answer A source of electrical energy, a
load or resistance to use electricity, and wires or conductors to connect them (source, load, conductor)
DC circuits can take one of three forms or types, what are they? - answer Series, Parallel, or Series-
Parallel
A 24 volt lead acid battery has how many cells? - answer 12
A fully charged lead acid battery has a specific gravity range between what two values? - answer 1.275
and 1.300
You must apply a correction to the specific gravity reading of the electrolyte of a lead acid battery when
the temperature is outside of what two values? - answer when temp is less than 70 or more than 90
Fahrenheit
What is the reason for having separate facilities for storing and servicing nickel-cadmium and lead-acid
batteries? - answer The electrolytes are chemically opposite and the fumes from one can contaminate
the electrolyte of the other
The state of charge of a nickel-cadmium battery cannot be determined by measuring the specific gravity
of the electrolyte for what reason? - answer There is no significant change in the specific gravity of the
electrolyte as the battery is charged or discharged in Ni-Cad batteries
What is the principal advantage of AC over DC? - answer Power can be transmitted over long distances
more efficiently and with smaller wires because the voltage can be easily increased or decreased by a
transformer
Questions and answers Latest Updates 2025
GRADED A+
What term defines the temperature at which all molecular activity stops? - answer Absolute zero
Can liquids be compressed? - answer No, liquids are generally considered incompressible
What are the units used to express hydraulic or pneumatic pressure - answer Pounds per square inch
(PSI)
Describe how pressure is transmitted when a force is applied to a confined liquid - answer Pressure is
transmitted equally in all directions
What formula expresses the relationship between force, pressure, and area - answer Force = Area X
Pressure (F over A I P)
What is the approximate speed of sound at sea level on a standard day? - answer 661 knots or 340
meters per second
What is the atmospheric pressure at sea level on a standard day? - answer 29.92 inches mercury or
1013.2 millibars
On a standard day at sea level, what is temperature? - answer 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? - answer Relative Humidity
What are the four principle forces acting on an airplane in flight? - answer Lift, Gravity, Thrust, Drag
,What is the term that describes the angle between the relative wind and the chord line of an airfoil? -
answer Angle of Attack
What are the factors that cause a wing to stall? - answer 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? - answer Lift increases,
drag increases, and stall speed decreases
What is the function of a wing mounted vortex generator? - answer They delay or prevent airflow from
separating from the upper surface of a wing during high speed flight (prevent boundary layer separation)
How does blade flapping help to compensate for dis-symmetry of lift in helicopter main rotor systems? -
answer 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? - answer During normal flight air moves downward, in auto-rotation air moves
upward
What is friction? - answer opposition to relative motion between two objects in contact with each other
One kilowatt is equal to how many watts? - answer 1,000
What law describes the basic relationships in an electrical circuit? - answer Ohm's law
What are the three elements of Ohm's law? - answer Voltage, Current, Resistance
How would you write Ohm's law as an equation? - answer E= I X R, R=E/I, I=E/R
, If the resistance in a DC circuit remains the same but the voltage doubles, what happens to the amount
of current flowing in the circuit? - answer It also doubles
In DC circuits, what unit measures power? - answer Watts
What three elements are required to form an electrical circuit? - answer A source of electrical energy, a
load or resistance to use electricity, and wires or conductors to connect them (source, load, conductor)
DC circuits can take one of three forms or types, what are they? - answer Series, Parallel, or Series-
Parallel
A 24 volt lead acid battery has how many cells? - answer 12
A fully charged lead acid battery has a specific gravity range between what two values? - answer 1.275
and 1.300
You must apply a correction to the specific gravity reading of the electrolyte of a lead acid battery when
the temperature is outside of what two values? - answer when temp is less than 70 or more than 90
Fahrenheit
What is the reason for having separate facilities for storing and servicing nickel-cadmium and lead-acid
batteries? - answer The electrolytes are chemically opposite and the fumes from one can contaminate
the electrolyte of the other
The state of charge of a nickel-cadmium battery cannot be determined by measuring the specific gravity
of the electrolyte for what reason? - answer There is no significant change in the specific gravity of the
electrolyte as the battery is charged or discharged in Ni-Cad batteries
What is the principal advantage of AC over DC? - answer Power can be transmitted over long distances
more efficiently and with smaller wires because the voltage can be easily increased or decreased by a
transformer
