ATPL (Philippines) - Aircraft General
Knowledge 1 Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
1. CAS is IAS corrected for: a. a. Position and instrument error
Position and instrument error
b. Instrument, pressure, and
density error c. Relative
density only d. Compressibility
2. With an almost discharged a. A decrease of voltage with
battery there will be: a. A increasing load
decrease of voltage with
increasing load b. Increase of
current with decrease of
voltage c. Decrease of current
with increasing load d.
Increase of voltage with
increasing load
3. At what height is it d. 41,000ft
mandatory for one flight crew
deck to wear an oxygen mask?
a. 25,000ft b. 32,000ft c.
37,000ft d. 41,000ft
4. When would the negative a. Rapid descent when AC descends
differential limits be below cabin altitude
reached/exceeded? a. Rapid
descent when AC descends
,below cabin altitude b. During
ground pressure testing c.
Rapid ascent when aircraft
climbs d. When changing to
manual operation
5. Maximum Differential a. Is the maximum authorized
pressure: a. Is the maximum pressure difference between the
authorized pressure difference inside of the fuselage and the
between the inside of the atmospheric ambient pressure
fuselage and the atmospheric
ambient pressure b. Is the
absolute pressure provided by
the vacuum pump c. Is the
pressure loss over a given
time limit d. Is the absolute
pressure the cabin pressure
ducting is designed to carry
6. Cabin altitude in pressured a. The altitude corresponding to
flight is: a. The altitude cabin pressure regardless of aircraft
corresponding to cabin height
pressure regardless of aircraft
height b. Is presented on a
second needle on the aircraft
altimeter c. Altitude at which
cabin pressure equals ambient
pressure d. Altitude
corresponding to cabin
pressure in relation to MSL ISA
conditions
7. With a gas turbine engine, b. Whenever the IOAT is +10°C or
engine anti-icing should be below and the air contains visible
, selected 'ON': a. Whenever the moisture
igniters are on b. Whenever
the IOAT is +10°C or below
and the air contains visible
moisture c. Whenever the
TOAT is +10°C or below and it
is raining d. Whenever the ice
detector system warning light
comes on
8. Which of the following d. Airspeed indicator and
instruments require inputs of machmeter
both pitot and static pressure?
a. Airspeed indicator,
machmeter and vertical speed
indicator b. Airspeed indicator,
vertical speed indicator,
altimeter c. Airspeed indicator
only d. Airspeed indicator and
machmeter
9. When smoke appears in the d. Emergency
cockpit, after donning the
oxygen mask the pilot should
select: a. Normal b. 100% c.
Diluter d. Emergency
10. When is spark plug fouling a. In the climb if you have not
most likely to occur? a. In the adjusted the mixture
climb if you have not adjusted
the mixture b. Cruise power c.
In the descent if you have not
adjusted the mixture d. Max
take-off power
Knowledge 1 Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
1. CAS is IAS corrected for: a. a. Position and instrument error
Position and instrument error
b. Instrument, pressure, and
density error c. Relative
density only d. Compressibility
2. With an almost discharged a. A decrease of voltage with
battery there will be: a. A increasing load
decrease of voltage with
increasing load b. Increase of
current with decrease of
voltage c. Decrease of current
with increasing load d.
Increase of voltage with
increasing load
3. At what height is it d. 41,000ft
mandatory for one flight crew
deck to wear an oxygen mask?
a. 25,000ft b. 32,000ft c.
37,000ft d. 41,000ft
4. When would the negative a. Rapid descent when AC descends
differential limits be below cabin altitude
reached/exceeded? a. Rapid
descent when AC descends
,below cabin altitude b. During
ground pressure testing c.
Rapid ascent when aircraft
climbs d. When changing to
manual operation
5. Maximum Differential a. Is the maximum authorized
pressure: a. Is the maximum pressure difference between the
authorized pressure difference inside of the fuselage and the
between the inside of the atmospheric ambient pressure
fuselage and the atmospheric
ambient pressure b. Is the
absolute pressure provided by
the vacuum pump c. Is the
pressure loss over a given
time limit d. Is the absolute
pressure the cabin pressure
ducting is designed to carry
6. Cabin altitude in pressured a. The altitude corresponding to
flight is: a. The altitude cabin pressure regardless of aircraft
corresponding to cabin height
pressure regardless of aircraft
height b. Is presented on a
second needle on the aircraft
altimeter c. Altitude at which
cabin pressure equals ambient
pressure d. Altitude
corresponding to cabin
pressure in relation to MSL ISA
conditions
7. With a gas turbine engine, b. Whenever the IOAT is +10°C or
engine anti-icing should be below and the air contains visible
, selected 'ON': a. Whenever the moisture
igniters are on b. Whenever
the IOAT is +10°C or below
and the air contains visible
moisture c. Whenever the
TOAT is +10°C or below and it
is raining d. Whenever the ice
detector system warning light
comes on
8. Which of the following d. Airspeed indicator and
instruments require inputs of machmeter
both pitot and static pressure?
a. Airspeed indicator,
machmeter and vertical speed
indicator b. Airspeed indicator,
vertical speed indicator,
altimeter c. Airspeed indicator
only d. Airspeed indicator and
machmeter
9. When smoke appears in the d. Emergency
cockpit, after donning the
oxygen mask the pilot should
select: a. Normal b. 100% c.
Diluter d. Emergency
10. When is spark plug fouling a. In the climb if you have not
most likely to occur? a. In the adjusted the mixture
climb if you have not adjusted
the mixture b. Cruise power c.
In the descent if you have not
adjusted the mixture d. Max
take-off power
