Sensors and Instruments 3 Flashcards
If the static intakes are completely clogged up by ice during a climb, the VSI shows:
zero.
The output from an engine vibration transducer is:
always filtered to remove unwanted frequencies.
A pitot tube covered by ice which blocks the ram air inlet will affect the following instrument (s):
airspeed indicator.
A pilot wishes to turn right on to a southerly heading with 20° bank at a latitude of 20° North. Using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of:
200°
The sensor(s) feeding the EPR-indicator is(are):
pressure probes, one located upstream from the compressor inlet, and the other downstream from the turbine outlet.
The purpose of the vibrating device of an altimeter is to:
reduce the effect of friction in the linkages.
During a climb at a constant CAS below the tropopause in standard atmosphere:
the Mach number increases and the speed of sound decreases.
The total pressure probe (pitot tube) comprises a mast which moves its port to a distance from the aircraft skin in order:
to locate it outside the boundary layer.
True Air Speed (TAS) is:
Indicated Air Speed (IAS) corrected for instrument, position, compressibility and density errors.
Concerning the direct reading magnetic compass, the turning error:
turning error is due to the vertical component of the earth’s magnetic field
During a climb at a constant IAS below the tropopause in standard atmosphere:
the Mach number and the TAS increase.
The alternate static source of a non-pressurized aircraft is located in the flight deck; as the alternate static source is opened, the vertical airspeed indicator may:
indicate a momentary climb.
In standard atmosphere, when climbing at constant CAS:
TAS and Mach number increase.
The total pressure probe (pitot tube) is mounted at a distance from the aeroplane skin such that:
it is located outside the boundary layer.
The most favourable conditions to apply the flexible take-off procedure are: 1 - high take-off mass 2 - low take-off mass 3 - high outside temperature 4 - low outside temperature 5 - high atmospheric pressure 6 - low atmospheric pressure The combination grouping all the correct answers is:
2,4,5
The Total Air Temperature (TAT) is:
the temperature resulting from the aircraft motion in the air.
The disadvantages of a float type fuel gauge are:
1- the design is complex
2- the indications are influenced by the aircraft attitude variations
3- the indications are influenced by the accelerations
4- the indications are influenced by temperature variations
The combination that regroups all of the correct statements is:
2, 3, 4.
A thermocouple consists of:
a junction of two dissimilar metals.
Concerning a fuel gauge system, a pilot is more interested by the:
mass of the fuel than the volume of the fuel.
A float type fuel gauge:
1 - gives a mass information
2 - gives information independent of aircraft’s manoeuvres and attitude changes
3 - gives information all the more accurate as the tank is full
4 - is typically a DC powered system
The combination that regroups all of the correct statements is:
4.
The advantages of a float type fuel gauge are (is):
1- easy construction
2- independence of indications with regard to aircraft attitude
3- independence of indications with regard to the accelerations
4- independence of indications with regard to temperature variations
The combination that regroups all of the correct statements is:
1.
A magnetic tachometer consists of:
a permanent magnet turning inside a non magnetic drag cup.
To indicate a temperature, a thermocouple requires:
To indicate a temperature, a thermocouple requires:
Given the following parameters, in a capacitance fuel gauge, the correct formula is:
A = area of plates
D = distance between plates
E = dielectric permittivity
Capacitance = E x A / D
A three-phase electrical tachometer utilises a generator feeding:
a synchronous motor turning a drag cup.
Given: E = electromotive force (emf) T = hot junction temperature K = constant The relationship that applies to a thermocouple is:
E = K x T
Given: E = electromotive force (emf) Tc = cold junction temperature Th = hot junction temperature K = constant The relationship that applies to a thermocouple is:
E = K x Th
The operating principle of an inductive probe tachometer is to measure the:
frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
The unit used to measure the capacitance of a capacitor is the:
Farad.
Any vibration displayed on an engine vibration monitoring system for a turbojet:
indicates rotor imbalance.
The flexible take-off mode:
1 - can be used only if the engines are recent
2 - reduces engine wear
3 - can be used in situations where take-off can be executed without the need for full engine power
4 - can only be used with an auto-throttle
The combination that regroups all of the correct statements is:
2, 3.
Concerning the flexible take-off mode, the temperature selected in the FMS is:
higher than the ambiant airfield temperature, in order to achieve a reduced power setting.
