ASA COMMERCIAL PILOT AIRPLANE
(CAX) EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025 Q&A | INSTANT
DOWNLOAD PDF
1. What is the purpose of wing flaps?
A. To decrease the wing area and increase drag
B. To increase lift and drag
C. To decrease lift and increase drag
D. To increase stall speed and reduce lift
Flaps increase both lift and drag, allowing for steeper approaches without
increasing airspeed.
2. What is one purpose of wing spoilers?
A. Increase lift
B. Reduce drag
C. Reduce lift
D. Increase yaw stability
,Spoilers disrupt the airflow over the wing, reducing lift and increasing descent
rate without increasing airspeed.
3. When must a commercial pilot log flight time?
A. Only when receiving dual instruction
B. Only when flying passengers
C. When acting as PIC or receiving instruction
D. Only when operating under Part 135
Commercial pilots must log time when acting as PIC or receiving training for
certification or currency.
4. A pilot operating under Part 91 has a blood alcohol level of 0.03%. Can they
fly?
A. Yes, if no passengers are aboard
B. No, unless 8 hours have passed since drinking
C. Yes, with ATC clearance
D. No, under any circumstances
FAR 91.17 prohibits flight within 8 hours of alcohol consumption or with a BAC
of 0.04% or greater.
5. The maximum indicated airspeed for flight below 10,000 feet MSL is:
A. 250 knots
B. 250 knots IAS
C. 200 knots GS
D. 200 knots TAS
,Under FAR 91.117, the maximum speed below 10,000 feet MSL is 250 knots
indicated airspeed.
6. In a constant-speed propeller, what does the governor control?
A. Blade angle to maintain selected RPM
B. Fuel-air mixture to the engine
C. Carburetor heat
D. Engine throttle position
The governor changes the blade pitch to maintain constant RPM regardless of
throttle setting.
7. What causes an aircraft to pitch down when power is reduced and no other
controls are adjusted?
A. The CG shifts forward
B. The elevator trim moves
C. The downwash on the elevators is reduced
D. The aircraft becomes unstable
When power is reduced, less airflow passes over the tail surfaces, reducing
elevator effectiveness and causing a pitch down.
8. Detonation occurs in a reciprocating engine when:
A. The spark plugs fire at the wrong time
B. The fuel-air mixture explodes rather than burns smoothly
C. The engine is running too lean
D. Preignition occurs
, Detonation is an uncontrolled, explosive ignition of the mixture and can damage
engine components.
9. What does the red radial line on an airspeed indicator represent?
A. Never exceed speed
B. Maneuvering speed
C. Maximum structural cruising speed
D. Never-exceed speed (Vne)
The red radial line indicates Vne — the speed which must not be exceeded under
any circumstances.
10.The commercial pilot applicant must have at least how many hours of
cross-country time?
A. 25 hours
B. 75 hours
C. 50 hours
D. 40 hours
FAR 61.129 requires at least 50 hours of cross-country time for commercial
certification.
11.What is the purpose of cowl flaps on an airplane engine?
A. Control the carburetor heat
B. Regulate engine cooling by adjusting airflow
C. Increase drag for landing
D. Balance fuel mixture
(CAX) EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025 Q&A | INSTANT
DOWNLOAD PDF
1. What is the purpose of wing flaps?
A. To decrease the wing area and increase drag
B. To increase lift and drag
C. To decrease lift and increase drag
D. To increase stall speed and reduce lift
Flaps increase both lift and drag, allowing for steeper approaches without
increasing airspeed.
2. What is one purpose of wing spoilers?
A. Increase lift
B. Reduce drag
C. Reduce lift
D. Increase yaw stability
,Spoilers disrupt the airflow over the wing, reducing lift and increasing descent
rate without increasing airspeed.
3. When must a commercial pilot log flight time?
A. Only when receiving dual instruction
B. Only when flying passengers
C. When acting as PIC or receiving instruction
D. Only when operating under Part 135
Commercial pilots must log time when acting as PIC or receiving training for
certification or currency.
4. A pilot operating under Part 91 has a blood alcohol level of 0.03%. Can they
fly?
A. Yes, if no passengers are aboard
B. No, unless 8 hours have passed since drinking
C. Yes, with ATC clearance
D. No, under any circumstances
FAR 91.17 prohibits flight within 8 hours of alcohol consumption or with a BAC
of 0.04% or greater.
5. The maximum indicated airspeed for flight below 10,000 feet MSL is:
A. 250 knots
B. 250 knots IAS
C. 200 knots GS
D. 200 knots TAS
,Under FAR 91.117, the maximum speed below 10,000 feet MSL is 250 knots
indicated airspeed.
6. In a constant-speed propeller, what does the governor control?
A. Blade angle to maintain selected RPM
B. Fuel-air mixture to the engine
C. Carburetor heat
D. Engine throttle position
The governor changes the blade pitch to maintain constant RPM regardless of
throttle setting.
7. What causes an aircraft to pitch down when power is reduced and no other
controls are adjusted?
A. The CG shifts forward
B. The elevator trim moves
C. The downwash on the elevators is reduced
D. The aircraft becomes unstable
When power is reduced, less airflow passes over the tail surfaces, reducing
elevator effectiveness and causing a pitch down.
8. Detonation occurs in a reciprocating engine when:
A. The spark plugs fire at the wrong time
B. The fuel-air mixture explodes rather than burns smoothly
C. The engine is running too lean
D. Preignition occurs
, Detonation is an uncontrolled, explosive ignition of the mixture and can damage
engine components.
9. What does the red radial line on an airspeed indicator represent?
A. Never exceed speed
B. Maneuvering speed
C. Maximum structural cruising speed
D. Never-exceed speed (Vne)
The red radial line indicates Vne — the speed which must not be exceeded under
any circumstances.
10.The commercial pilot applicant must have at least how many hours of
cross-country time?
A. 25 hours
B. 75 hours
C. 50 hours
D. 40 hours
FAR 61.129 requires at least 50 hours of cross-country time for commercial
certification.
11.What is the purpose of cowl flaps on an airplane engine?
A. Control the carburetor heat
B. Regulate engine cooling by adjusting airflow
C. Increase drag for landing
D. Balance fuel mixture
