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CPL Test Series
Question Bank
Questions for ALTIMETRY1
Answer the following questions
Test Mode
Training Mode
1. Flying at FL 135 above the sea, the Radio Altimeter indicates a true altitude of 13500 ft. The local QNH is 1019 hPa. Hence the crossed air mass is, on average,
Colder than ISA
At ISA standard temperature
Warmer than ISA
There is insufficient information to determine the average temperature deviation
2. MSA given as 12,000 ft, flying over mountains in temperatures +9°C, QNH set as 1023 (obtained from a nearby airfield. What will the true altitude be when 12,000 ft is reached?
12,210
11,148
11,940
12,864
3. You are flying in the Alps at the same level as the summits on a hot day. What does the altimeter read?
Impossible to tell
Same altitude as the summit
Lower altitude as the summit
Higher altitude as the summit
4. Which of these would cause your true altitude to decrease with a constant indicated altitude?
Hot air/Low pressure
Hot air/High pressure
Cold air/High pressure
Cold air/Low pressure
5. Flying from Marseilles to Palma you discover your true altitude is increasing, but oddly the QNH is identical at both places. What could be the reason?
Palma is lower than Marseilles
Re-check the radio altimeter
Re-check the QNH
The air at Palma is warmer
6. What is the relationship between QFE and QNH at an airport 50ft below MSL?
QFE > QNH
QFE < QNH
There is no clear relationship
QFE = QNH
7. You are flying from Madrid (QNH 1012) to Paris (QNH 1015) at FL 80. If your true altitude and indicated altitude remain the same then
The altimeters are incorrect
Your indicated altitude must be changing
The air at Madrid is warmer than Paris
The air at Paris is warmer than Madrid
8. Up to FL 180 ISA Deviation is ISA +10°C. What is the actual depth of the layer between FL 60 and FL 120?
5760 ft
6000 ft
5700 ft
6240 ft
9. An airfield has an elevation of 540ft with a QNH of 993mb. An aircraft descends and lands at the airfield with 1013mb set. What will its altimeter read on landing?
0ft
540ft
1080ft
380ft
10. Up to FL 180 ISA Deviation is ISA -10°C.What is the actual depth of the layer between FL 60 and FL 120?
5700 ft
5760 ft
6240 ft
6000 ft
11. When flying at FL180 in the Southern Hemisphere you experience a left crosswind. What is happening to your true altitude if indicated altitude is constant?
Remains the same
Increasing
Impossible to tell
Decreasing
12. You are flying in an atmosphere which is warmer than ISA, what might you expect?
True altitude to be the same as Indicated altitude
True altitude to be higher than Indicated altitude
True altitude to be lower than Indicated altitude
True altitude to be the decreasing
13. You are flying at FL160 with an OAT of -27°C. QNH is 1003 hPa. What is your true altitude?
15,730 ft
15,540 ft
15,090 ft
16,330 ft
14. QNH is 1003. At FL100 true altitude is 10,000ft. Is it
Colder than ISA
Cannot tell
Same as ISA
Warmer than ISA
15. You fly over the sea at FL 90, your true altitude is 9100 ft and QNH is unknown. What can be said about the atmosphere temperature?
It is colder than ISA
It is warmer than ISA
QNH is lower than standard
Nothing, insufficient information.
16. QFE is 1000 hPa with an airfield elevation of 200 m AMSL. What is QNH? (use 8 m per hPa)
1025 HPa
975 HPa
992 HPa
1008 HPa
17. What temperature and pressure conditions would be safest to ensure that your flight level clears all the obstacles by the greatest margin?
Cold temp/low pressure
Temp less than or equal to ISA and a QNH less than 1013
Warm temp/high pressure
Temp more than or equal to ISA and a QNH greater than 1013
18. What condition would cause your indicated altitude to be lower than that being actually flown?
temperature higher than standard
Pressure lower than standard
temperature lower than standard
Pressure is standard
19. QNH is 1030. Aerodrome is 200m AMSL. What is QFF?
Same
Higher than 1030
Lower than 1030
Not enough info
20. Altimeter set to 1023 at aerodrome. On climb to altitude the SPS is set at transition altitude. What will indication on altimeter do on resetting to QNH?
Dependent on temperature
Increase
Decrease
Same
21. You are cruising at FL 200, OAT is -40°C, sea level pressure is 1033 hPa. Calculate the true altitude?
18260 ft
20660 ft
21740 ft
19340 ft
22. If an Aerodrome is 1500ft AMSL on QNH 1038, what will the actual height AGL to get to FL75?
8325 ft
5325 ft
8175 ft
6675 ft
23. You are flying from Marseilles (QNH 1012 hPa) to Palma de Mallorca (QNH 1012 hPa) at FL100. You notice that the effective height above MSL (Radio Altitude) increases constantly. Hence...
One of the QNH values must be wrong.
You have the altimeters checked, as their indications are obviously wrong.
The air mass above Palma is warmer than that above Marseilles
You have to adjust for a crosswind from the right.
24. Which of the following is true? QNH is
Always more than 1013.25 hPa
Can never be above or below 1013 hPa
Never 1013.25 hPa
Always less than 1013.25 hPa
25. How is QNH determined from QFE?
Using the temperature of the airfield and the elevation of the airfield
Using the temperature at MSL and the elevation of the airfield
Using the elevation
Using the temperature
26. You have landed on an airport elevation 1240 ft and QNH 1008 hPa. Your altimeter subscale is erroneously ser to 1013 hPa. The indication on the altimeter will be?
1280 ft
1375 ft
1200 ft
1105 ft
27. The QNH is 1030 hPa and at the Transition Level you set the SPS. What happens to your indicated altitude (assume 27 ft per 1 hPa)?
Drops by 459 ft
Rises
Rises by 459 ft
No change
28. You fly from east to west at the 500 hPa level in the Northern Hemisphere;
if you encounter northerly drift, there is a gain in altitude
you fly towards an area of lower pressure, and therefore, experience a loss in altitude
if the wind is from the south there is again in altitude
if the wind is from the north there will be a gain in altitude
29. How do you calculate the lowest useable flight level?
Lowest QNH and highest negative temperature below ISA
Highest QNH and lowest temperature
Lowest QNH and lowest negative temperature below ISA
Highest QNH and highest temperature above ISA
30. If you are flying on a QNH 1009 on very cold day and you circle the top of a peak in the Alps, your altimeter will read
Not enough information to tell
Higher than the elevation of the peak
The same as the elevation of the peak
Lower than the elevation of the peak
31. You are flying at FL 100 in an air mass that is 15°C colder than ISA. Local QNH is 983 hPa. What would the true altitude be?
11410 ft
10210 ft
10000 ft
8590 ft
32. An aircraft flying in the Alps on a very cold day, RPS 1013 set in the altimeter, flies level with the summit of the mountains. Altitude from aneroid altimeter reads
Higher than mountain elevation
Lower than mountain elevation
Impossible to determine
Same as mountain elevation
33. When is pressure altitude equal to true altitude?
When the indicated altitude is equal to the pressure altitude
When the temperature is standard
In standard conditions
When surface pressure is 1013.25mb
34. Flying from Marseilles (QNH 1012) to Palma (QNH 1015) at FL100. You do not reset the altimeter, why would true altitude be the same throughout the flight?
Blocked static vent
Air at Palma is warmer than air at Marseilles
Air at Marseilles is warmer than air at Palma
Not possible to tell
35. Which statement is true?
QFE can be equal to QFF only
QNH can be equal to QFE
QFE is always lower than QNH
QNH is always lower than QFE
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