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CPL Test Series
Question Bank
Questions for R* #AL* ALTIMETER
Answer the following questions
Test Mode
Training Mode
1. A vibrator is sometimes fitted in an altimeter to?
Reduce sensing errors
Overcome gauge parallax error
Reduce instrument errors
2. Position error is caused due to
All of the above
Configuration of A/C
Ground effect
3. Altimeter gives height of aircraft with Respect To
A.G.L
M.S.L
Set Datum
4. The altimeter is fed by
static pressure
dynamic pressure
differential pressure
5. The purpose of the vibrating device of an altimeter is to?
Allow damping of the measurement in the unit
Reduce the hysteresis effect
Reduce the effect of friction in the linkages
6. Bimetallic strip in altimeter is provided
To compensate for thermal expansion of mechanical linkages
To compensate for adiabatic rise in temperature of temp error
To compensate for temp. error
7. A barometric altimeter comprises of?
An aneroid capsule sensing pilot pressure
An aneroid capsule sensing static pressure
A differential capsule sensing pilot and static pressures
8. In an aircraft a static source is so placed that it is having subjected to dynamic pressure. The error caused of any will be known as
Position Error
There will be no error
Dynamic Pressure Error
9. In case of accidental closing of an aircraft's left static pressue port (rain, birds), the altimeter
over reads the altitude in case of a sideslip to the left and displays the correct information during symmetric flight
keeps on providing reliable reading in all situations
Under reads the altitude
10. An aircraft is passing 6,500 ft in a desert when the static line becomes blocked. The altimeter then reads
6,500 ft
zero
less than 6,500 ft
11. A servo altimeter is _____ than a conventional one because of _____
More accurate, electrical servos
More accurate, electrical pick off coils
Less accurate, electrical servos
12. A pilot is given a QNH of 1003 hPa while coming in to land. He forgets to reset his altimeter. The error experienced will be
Pilot Error
Pressure Error
Barometric error
13. A servo altimeter has a quoted accuracy of 1 hPa at mean sea level. The accuracy in the standard atmosphere is
+- 27 ft at MSL and +- 50 ft at 10 000 ft
+- 50 ft at 10000 ft and +- 100 ft at 40 000 ft
+- 50 ft at 20 000 ft and +- 90 ft at the tropopause
14. The altimeter of an aircraft with a static pressure source on each side of the fuselage will if one becomes blocked?
Over read when side slipping towards the clear source
Over read when side slipping
Over read when side slipping towards the blocked source
15. If the static vent becomes partly blocked in a descent the indications will?
Be too high when descending but correct when at constant height
Be too high when descending but correct when at constant altitude
Be too low when descending but correct when at constant altitude
16. From where does the ADC obtain altitude data?
Barometric altitude source
Radio Altimeter
OAT sources
17. In a barometric altimeter ______ Is fed into the capsule and ____ Is fed into the case?
Static pressure dynamic pressure
Vacuum Static pressure
Dynamic pressure Vacuum
18. Lag error in servo assisted altimeter is virtually removed by
Using more than one capsule in series
Electromechanical pick off device
Rocking mechanism
19. If the static source of an altimeter becomes blocked during a descent the instrument will
under-read
gradually indicate zero
continue to display the reading at which the blockage occurred
20. For an altimeter, pressure fluctuations at the static vent cause
Barometric error
Position error
Hysteresis error
21. The purpose of stand by static source is
To be used in emergency
To reduce position error
Both a and b
22. What will happen if an a/c has 2 altimeters, one of which is compensated for position error, whilst the other is not
One will over read at high air speed
One will under read at high air speed
One will under read close to the ground
23. The pressure altitude is the altitude corresponding
in ambiant atmosphere, to the reference pressue Ps
in standard atmosphere, to the pressure Ps prevailing at this point
in standard atmosphere, to the reference pressue Ps
24. If the static pressure source in an un-pressurized aircraft became blocked the altimeter would ______ but might be rectified by ____?
Read zero open the windows
Freeze break the altimeter glass
Read zero break the altimeter glass
25. The principle of operation of a servo-assisted pressure altimeter is that
static pressure changes are converted via an E- and I-bar transducer into electrical signal which is used, via a follow-up system, to move a digital counter and pointer system
static pressure enters an aneroid capsule causing it to expand
static pressure is used in the same way as a simple altimeter except that several capsules are used
26. White zebra crossing on altimeter appears when
a/c is above, 10,000
a/c is below MSA (minimum safe altitude)
a/c is below10,000
27. The altimeter consists of several aneroid capsules located in a sealed casing. The pressure in the aneroid capsule (i) and casing (ii) are respectively
(i) vacuum (or a very low pressure) (ii) static pressure
(i) static pressure at time t (ii) static pressure at time t- t
(i) static pressure (ii) total pressure
28. The error in altimeter readings caused by the variation of the static pressure near the source is known as
position pressure error
barometric error
hysteresis effect
29. The altitude indicated on board an aircraft flying in an atmosphere where all atmosphere layers below the aircraft are warm is
the same as the real altitude
equal to the standard altitude
Higher than the real altitude
30. What will happen to the altimeter reading if an aircraft flying at a fixed heading meets a cloder air mass?
Read zero
Read more than true altitude
Read less than true altitude
31. An aircraft is flying straight and level, over a warm air mass. The altimeter reading will be
correct
less than the real height
Greater than the real height
32. Pressure error in an altimeter arises because
The true external static pressure is not accurately transmitted to the instrument
The true external kinetic pressure is not accurately transmitted to the instrument
The true external dynamic pressure is not accurately transmitted to the instrument
33. If static source of a/c is blocked in un pressurized a/c the correct action for pilot will be
Use stand by static source
Break glass of VSI
Break glass of altimeter
34. Transducer in servo assisted altimeter is sued to
To remove lag error
Increase sensitivity of altimeter
All the above
35. In a non-pressurized aircraft, if one or several static pressure ports are damaged, there is an ultimate emergency means for restoring a practically correct static pressure intake
Slightly opening a window to restore the ambient pressure in the cabin
breaking the rate - of -climb indicator glass window
calculating the ambient static pressure, allowing for the altitude and ANH adjusting the instruments
36. Pressure error is maximum at
As in and under ground effect
Low level and high speed
High speed and high altitude
37. We are maintaining a constant flight level. That means
the altitude is constant when the sea-level pressure is constant
the outside air pressure is constant if the temperature remains constant
the outside air pressure is constant
38. Temp.error in altimeter is caused due to
Non standard temp lapse rate
Non standard MSL temp
Non standard temp at a/c altitude
39. When flying from a sector of warm air into one of colder air, the altimeter will?
Over read
Under read
Show the actual height above ground
40. If icing or debris cause pressure disturbances at the static source, the effect will be?
Increased position error
Increases instrument error
Increase compressibility error
41. The primary factor which makes the servo-assisted altimeter more accurate than the simple pressure altimeter is the use of
an induction pick-off device
combination of counters/pointers
more effective temperature compensating leaf springs
42. At sea level, on a typical servo altimeter, the tolerance in feet from indicated must not exceed
+/-75ft
+/-60ft
+/-30ft
43. What will happen to the altimeter reading in a right sideslip, if an aircraft has a static vent at each side of the fuselage, but the left one is blocked?
Over read
No change
Under read
44. What will happen to the altimeter reading in a right sideslip, if an aircraft has a static vent at each side of the fuselage, but the right one is blocked?
Over read
No change
Under read
45. When flying from low pressure to high pressure, the barometric error of an altimeter will cause the instrument to
indicate a higher altitude than the correct one
indicate the true altitude
Under read the true altitude of the aircraft
46. If the pilot source becomes blocked the barometric altimeter will?
Be unaffected
Read zero
Freeze
47. A servo altimeter is ____ it employs an electrical pick-off?
Less accurate because
Less reliable because
More accurate because
48. When flying from a sector of warm air into one of colder air, the altimeter will
Over read
Under read
be just as correct as beofre
49. The hysteresis error of an altimeter varies substantially with the
mach number of the aircraft
Aircraft altitude
time passed at a given altitude
50. The advantage of sensitive altimeter over service altimeter is
It does not form lag error
Instrument error is really eliminated
It can be used up to higher altitude
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