Sensors and Instruments 2 Flashcards
The disadvantages of a single-phase A.C. generator tachometer are:
1- the presence of spurious signals due to a D.C. generator commutator
2- the importance of line resistance on the information value
3- the influence of temperature on the tachometer information
The combination regrouping all the correct statements is:
2.
The altimeter is supplied with:
static pressure.
Torque can be determined by measuring the:
change in phase between the torque shaft and the reference shaft.
The engine instrument utilising an aneroid pressure diaphragm is the:
manifold pressure gauge.
A thermocouple type temperature sensor is composed of:
two dissimilar metals joined together at one end (called hot junction or measure junction).
During an acceleration phase at constant attitude, the control system of the artificial horizon results in the horizon bar indicating a:
nose-up attitude
To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle:
thermocouple
Concerning the direct reading magnetic compass, the turning error:
increases with the magnetic latitude.
During deceleration following a landing in a southerly direction, a magnetic compass made for the northern hemisphere indicates:
no apparent turn.
Total Air Temperature (TAT) is:
higher or equal to Static Air Temperature (SAT) depending on Mach number and SAT
An aircraft takes-off on a runway with an alignment of 045°; the compass is made for the northern hemisphere. During rolling take-off, the compass indicates:
a value below 045°.
Below the tropopause in standard conditions, when climbing at a constant Mach number:
TAS decreases.
Below the tropopause in standard conditions, when descending at a constant Mach number:
TAS increases.
CAS is obtained from IAS by correcting for the:
position and instrument errors.
During a deceleration phase at constant attitude, the control system of an air driven artificial horizon results in the horizon bar indicating a:
nose down attitude.
During deceleration following a landing in a westerly direction, a magnetic compass made for the northern hemisphere indicates:
an apparent turn to the south.
During deceleration following a landing in an easterly direction, a magnetic compass made for the northern hemisphere indicates:
an apparent turn to the south.
The EAS is obtained from CAS by correcting for the following errors: 1 - position 2 - compressibility 3 - instrument 4 - density The combination regrouping all the correct statements is:
2.
The EAS is obtained from CAS by correcting for:
compressibility error.
The EAS is obtained from IAS by correcting for the following errors: 1 - instrument 2 - position 3 - density 4 - compressibility The combination regrouping all the correct statements is:
1, 2, 4.
During a climb at a constant CAS below the tropopause in standard conditions:
TAS and Mach number increase.
Maintaining CAS and flight level constant, a fall in ambient temperature results in:
lower TAS because air density increases.
Parallax error is:
a reading error.
The mode selector of an inertial unit comprises the OFF - STBY - ALIGN - NAV - ATT positions: 1 - on “STBY”, the unit aligns on the local geographic trihedron; 2 - the “ATT” position is used in automatic landing (mode LAND); 3 - on “NAV” the coordinates of the start position can be entered; 4 - the platform is levelled before azimuth alignment; 5 - in cruise, the unit can only be used in “NAV” mode. The combination regrouping all the correct statements is:
4.
The range of a low altitude radio altimeter is:
2 500 ft.
The TAS is equal to the EAS only if:
P = 1013,25 hPa and OAT = 15°C.
True Air Speed (TAS) is obtained from Calibrated Air Speed (CAS) by correcting for the following errors: 1 - instrument 2 - compressibility 3 - position 4 - density The combination regrouping all the correct statements is:
2, 4.
When climbing at a constant CAS in a standard atmosphere:
TAS increases.
When descending at a constant CAS in a standard atmosphere: 1 - TAS increases 2 - TAS decreases 3 - Mach number increases 4 - Mach number decreases The combination regrouping all the correct statements is:
2, 4.
When descending at a constant CAS:
Mach number decreases.
Which of the following statements are correct for an aeroplane cruising at FL 60 with a true airspeed (TAS) of 100 kt in standard atmospheric conditions? 1 - The TAS is approximately 10% higher than the IAS. 2 - The difference between the equivalent airspeed (EAS) and the calibrated airspeed (CAS) is negligible. 3 - The speed displayed on the airspeed indicator is a calibrated airspeed (CAS) if the position error and instrument error are zero.
1, 2 and 3 are all correct.
During a descent at a constant CAS below the tropopause in standard conditions:
Mach number and TAS decrease.
Magnetic compass errors are:
about north change, depending on the bank angle and magnetic heading.
The basic principle of a capacitance fuel gauge system is that the:
capacity of a capacitor depends on the nature of the dielectric in which it is immersed.
The most common system used to monitor turbine gas exhaust temperature is the:
hot and cold junction, alumel/chromel system.
The Mach Number is proportional to the ratio: NB: “a” indicates the local speed of sound.
TAS/a
For an aircraft flying a true track of 360° between the 5°S and 5°N parallels, the precession error of the directional gyro due to apparent drift is equal to:
approximately 0°/hour
Equivalent Air Speed (EAS) is:
Calibrated Air Speed (CAS) corrected for compressibility error.
Electrical requirements for an alumel/chromel indicating system are
power for gauge lighting only.
During a descent at a constant calibrated airspeed (CAS) below the tropopause in ISA conditions:
Mach number and TAS decrease.
