Sensors and Instruments 3

Question 1

If the static intakes are completely clogged up by ice during a climb, the VSI shows:

Answer 1

zero.

Question 2

The output from an engine vibration transducer is:

Answer 2

always filtered to remove unwanted frequencies.

Question 3

A pitot tube covered by ice which blocks the ram air inlet will affect the following instrument (s):

Answer 3

airspeed indicator.

Question 4

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:

Answer 4

200°

Question 5

The sensor(s) feeding the EPR-indicator is(are):

Answer 5

pressure probes, one located upstream from the compressor inlet, and the other downstream from the turbine outlet.

Question 6

The purpose of the vibrating device of an altimeter is to:

Answer 6

reduce the effect of friction in the linkages.

Question 7

During a climb at a constant CAS below the tropopause in standard atmosphere:

Answer 7

the Mach number increases and the speed of sound decreases.

Question 8

The total pressure probe (pitot tube) comprises a mast which moves its port to a distance from the aircraft skin in order:

Answer 8

to locate it outside the boundary layer.

Question 9

True Air Speed (TAS) is:

Answer 9

Indicated Air Speed (IAS) corrected for instrument, position, compressibility and density errors.

Question 10

Concerning the direct reading magnetic compass, the turning error:

Answer 10

turning error is due to the vertical component of the earth’s magnetic field

Question 11

During a climb at a constant IAS below the tropopause in standard atmosphere:

Answer 11

the Mach number and the TAS increase.

Question 12

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:

Answer 12

indicate a momentary climb.

Question 13

In standard atmosphere, when climbing at constant CAS:

Answer 13

TAS and Mach number increase.

Question 14

The total pressure probe (pitot tube) is mounted at a distance from the aeroplane skin such that:

Answer 14

it is located outside the boundary layer.

Question 15

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:

Answer 15

2,4,5

Question 16

The Total Air Temperature (TAT) is:

Answer 16

the temperature resulting from the aircraft motion in the air.

Question 17

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:

Answer 17

2, 3, 4.

Question 18

A thermocouple consists of:

Answer 18

a junction of two dissimilar metals.

Question 19

Concerning a fuel gauge system, a pilot is more interested by the:

Answer 19

mass of the fuel than the volume of the fuel.

Question 20

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:

Answer 20

4.

Question 21

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:

Answer 21

1.

Question 22

A magnetic tachometer consists of:

Answer 22

a permanent magnet turning inside a non magnetic drag cup.

Question 23

To indicate a temperature, a thermocouple requires:

Answer 23

To indicate a temperature, a thermocouple requires:

Question 24

Given the following parameters, in a capacitance fuel gauge, the correct formula is:
A = area of plates
D = distance between plates
E = dielectric permittivity

Answer 24

Capacitance = E x A / D

Question 25

A three-phase electrical tachometer utilises a generator feeding:

Answer 25

a synchronous motor turning a drag cup.

Question 26

Given:
E = electromotive force (emf)
T = hot junction temperature
K = constant
The relationship that applies to a thermocouple is:

Answer 26

E = K x T

Question 27

Given:
E = electromotive force (emf)
Tc = cold junction temperature
Th = hot junction temperature
K = constant
The relationship that applies to a thermocouple is:

Answer 27

E = K x Th

Question 28

The operating principle of an inductive probe tachometer is to measure the:

Answer 28

frequency of the electric impulse created by a notched wheel rotating in a magnetic field.

Question 29

The unit used to measure the capacitance of a capacitor is the:

Answer 29

Farad.

Question 30

Any vibration displayed on an engine vibration monitoring system for a turbojet:

Answer 30

indicates rotor imbalance.

Question 31

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:

Answer 31

2, 3.

Question 32

Concerning the flexible take-off mode, the temperature selected in the FMS is:

Answer 32

higher than the ambiant airfield temperature, in order to achieve a reduced power setting.