Course > pilot : The engine instrument utilising an aneroid pressure diaphragm is the ?

Question 40-1 : Manifold pressure gauge oil pressure gauge fuel pressure gauge oil temperature gauge

exemple 140 manifold pressure gauge. — manifold pressure gauge.

To permit turbine exit temperatures to be measured gas turbines are equipped ?

Question 40-2 : Thermocouple bi metallic strip liquid expansion gas pressure

exemple 144 thermocouple. — . 993.a thermocouple type thermometer consists of two metal conductors of different type connected at two points the operating principle of a thermocouple is a conductor that is subject to a thermal gradient generates a voltage.this voltage is measured and interpreted by a thermocouple thermometer millivoltmeter thermocouple.

A 'bourdon tube' is used in ?

Question 40-3 : Pressure sensors vibration detectors smoke detectors turbine temperature probes

exemple 148 pressure sensors. — pressure sensors.

If an epr is set at a constant barometric pressure with an increasing oat the ?

Question 40-4 : Remains constant varies according to the characteristics of the engine increases decreases

exemple 152 remains constant. — Thrust is the force generated by the engines .thrust is the acceleration of a mass of air .thrust = mass x acceleration.mass = density x volume..therefore a decrease in density due to an increasing oat would result in less mass being accelerated and therefore a decrease in thrust but the engine management system does trim fuel automatically to maintain selected thrust settings for changes in oat remains constant.

In a compensated capacitance type quantity indicating system the contents gauge ?

Question 40-5 : Remain the same increase by 5% decrease by 5% increase by 10%

exemple 156 remain the same. — .the capacity of a capacitor depends on the nature of the dielectric in which it is immersed fuel has twice the capacitance of air so a full tank has twice the capacitive reactance as en empty one .if a temperature rise increases the fuel volume the fuel weight remains the same remain the same.

On an multi engine aircraft a synchroscope is used to .1 reduce structural ?

Question 40-6 : 1 is correct 2 is incorrect 1 is correct 2 is correct 1 is incorrect 2 is correct 1 is incorrect 2 is incorrect

exemple 160 1 is correct, 2 is incorrect. — Cqb15 august 2012..the purpose of a synchroscope is to reduce structural vibration and noise the synchronizing system ensures that the propeller speeds are all the same this is achieved by an electrical system that compares speed signals from engine mounted generators out of balance signals using one engine as a master signal are automatically corrected by electrically trimming the engine speeds until all signals are equal 1 is correct, 2 is incorrect.

The basic principle of a capacitance fuel gauge system is that the ?

Question 40-7 : Capacity of a capacitor depends on the nature of the dielectric in which it is immersed internal resistance of a capacity depends on the nature of the dielectric in which it is immersed capacity of a capacitor depends only on the density of the liquid on which it is immersed electromotive force of a capacity depends on the nature of the dielectric in which it is immersed

exemple 164 capacity of a capacitor depends on the nature of the dielectric in which it is immersed. — .a capacitance type fuel gauge system consists of a variable capacitor located in the fuel tank an amplifier and an indicator. the complete circuit forms an electrical bridge which is continuously being rebalanced as a result of the differences between the capacitances of the tank capacitor and a reference capacitor. the signal produced due to the differences in the signals is amplified to operate a motor. the motor then drives the pointer to indicate the capacitance change of the tank capacitor and thus change in the fuel quantity is indicated...we have seen the basic construction of this system now let us discuss how the electrical capacitance principle is utilized for the capacitance type fuel gauge system in aircraft. the capacitors which are to be installed in the fuel tanks for the fuel quantity measurement must be different in construction from those normally employed in electrical equipment. the plates of the capacitors take the form of two tubes mounted concentrically with a narrow air space between them these plates extend the full depth of a fuel tank...capacitance depends on some factors which are area of the plates distance between the two plates and the dielectric constant of the material between the two plates of the capacitors .now in this capacitance type fuel gauge system the two factors plate area and distance between plates are fixed and the dielectric here is the fuel in the tank of the aircraft. the flow of a momentary current into a capacitor establishes a potential difference across its plates. the dielectric i e fuel in the aircraft's fuel tanks contains no free electrons so the current cannot flow through it but it should be remembered that potential difference sets up a state of stress in the atoms comprising it capacity of a capacitor depends on the nature of the dielectric in which it is immersed.

Assuming that the cas remains constant if the total pressure probe is blocked ?

Question 40-8 : Remains constant during level flight increases during a climb and decreases during a descent remains constant during level flight decreases during a climb and increases during a descent increases during level flight remains constant during a climb and a descent remains constant during all the phases of the flight

exemple 168 remains constant during level flight, increases during a climb and decreases during a descent. — .with a blocked pitot the pressure in the capsule is fixed like an altimeter when the aircraft climbs and the static in the case decreases the capsule expands and the reading on the instrument increases like an altimeter .to hold the ias constant in the climb i e not allow the capsule to expand the actual airspeed will have to decrease remember that with a blocked pitot the asi over reads in the climb and under reads in the descent with constant ias and blocked pitot the real ias and therefore tas will decrease until the aircraft stalls remains constant during level flight, increases during a climb and decreases during a descent.

Gas turbine engine rotational speed rpm is usually sensed using either ?

Question 40-9 : A 3 phase ac tachometer generator or an ac phonic wheel system a single phase ac tachometer generator or an ac phonic wheel system a 28vdc tachometer generator or an ac phonic wheel a 28vdc tachometer generator or a dc phonic wheel

exemple 172 a 3 phase ac tachometer generator or an ac phonic wheel system. — a 3 phase ac tachometer generator or an ac phonic wheel system.

The output from an engine vibration transducer is ?

Question 40-10 : Always filtered to remove unwanted frequencies inversely proportional to engine speed directly proportional to engine speed fed directly to the indicator in the cockpit without amplification or filtering

exemple 176 always filtered to remove unwanted frequencies. — .virations are picked up by accelerometers so you measure accelerations piezzo electric or capacity type pickups giving after conversion displacement / square second .a first integration will give displacement speed displacement per second a second integration will give displacement .each integration may introduce or amplify measurement errors but the initial acceleration signal is not practical for use depending on the engine type and the bearing location the displacement speed usually noted in inch per second ips is used .the vibration frequency is filtered for the cockpit indication to indicate only vibration in a frequency band corresponding to the spool speed n1 n2 n3 that's why engines can have vibrations which are not related to spools rotating speed not being indicated in the cockpit always filtered to remove unwanted frequencies.

The sensor s feeding the epr indicator is are ?

Question 40-11 : Pressure probes one located upstream from the compressor inlet and the other downstream from the turbine outlet temperature probes one located upstream from the compressor inlet and an other downstream from the turbine outlet tachometer located on the shaft of the n2 compressor tachometer located on the shaft of the n1 compressor

The rpm indicator or tachometer of a piston engine can include a small red arc ?

Question 40-12 : Propeller generates vibration continuous rating is forbidden rating is the maximum possible in continuous mode rating is the minimum usable in cruise propeller efficiency is minimum at this rating

exemple 184 propeller generates vibration, continuous rating is forbidden — propeller generates vibration, continuous rating is forbidden

A three phase electrical tachometer consists of ?

Question 40-13 : A three phase generator a synchronous motor and a magnetic tachometer three associated dynamos a speed probe and a phonic wheel three speed probes and a phonic wheel

Cas can be obtained from the following data ?

Question 40-14 : Eas and pressure altitude eas and density altitude tas and pressure altitude tas and density altitude

exemple 192 eas and pressure altitude. — .to get from cas via eas to tas we use pressure altitude and temperature to go back from tas via eas to cas we would again use pressure altitude and temperature .eas is cas corrected for compressibiliy and compressibility is related to pressure altitude eas and pressure altitude.

The properties of a single phase electrical tachometer are.1 indication ?

Question 40-15 : 1 2 3 1 2 1 3 2 3

exemple 196 1, 2, 3. — .a single phase electrical tachometer inductive probe requires an external power supply for signal processing the indication depends on the line resistance and it is a simple design tachometer 1, 2, 3.

Concerning a fuel gauge system a pilot is more interested by the ?

Question 40-16 : Mass of the fuel than the volume of the fuel volume of the fuel than the mass of the fuel volume of the fuel than the density of the fuel volume of the fuel than the permittivity of the fuel

exemple 200 mass of the fuel than the volume of the fuel. — mass of the fuel than the volume of the fuel.

A float type fuel gauge . 1 gives a mass information. 2 gives information ?

Question 40-17 : 4 1 2 3 4 1 3 4 1

A magnetic tachometer consists of ?

Question 40-18 : A permanent magnet turning inside a non magnetic drag cup a single phase generator connected to a synchronous motor a single phase generator connected to a asynchronous motor a three phase generator connected to a synchronous motor

exemple 208 a permanent magnet turning inside a non magnetic drag cup. — Magnetic tachometer.the magnetic tachometer consists of rotary bell shaped permanent magnet 1 and core 2 between which there is a narrow gap .arranged in this gap is hollow aluminum cylinder 3 held against rotation by coil spring 4 .the rotating magnetic field induces currents in cylinder 3 which tend to rotate the cylinder with a force whose torque is proportional to the speed of rotation of magnet 1 .a scale with uniform divisions is engraved on the outside circumference of cylinder 3 it indicates the speed rpm of magnet 1 and of the shaft whose speed is to be measured in opening 5 a permanent magnet turning inside a non magnetic drag cup.

Given the following parameters in a capacitance fuel gauge the correct formula ?

Question 40-19 : Capacitance = e x a / d capacitance = e x d / a capacitance = a x d / e capacitance = e x d x a

exemple 212 capacitance = e x a / d — capacitance = e x a / d

A three phase electrical tachometer utilises a generator feeding ?

Question 40-20 : A synchronous motor turning a drag cup directly a voltmeter directly a galvanometer directly a drag cup

exemple 216 a synchronous motor turning a drag cup. — The electrical generator system utilises a small three phase tachometer generator driven by the engine the output of this generator is then taken to an indicator which consists of a synchronous motor turning a drag cup assembly which moves a pointer over a scale as in the mechanical system. three phase electrical tachometer a synchronous motor turning a drag cup.

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

Question 40-21 : Frequency of the electric impulse created by a notched wheel rotating in a magnetic field electromotive force produced by a dynamo or an alternator rotation speed of an asynchronous motor energized by an alternator magnetic field produced by a dynamo or an alternator

exemple 220 frequency of the electric impulse created by a notched wheel rotating in a magnetic field. — 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 ?

Question 40-22 : Farad hz joule watt

exemple 224 farad. — .the farad symbol 'f' is the si derived unit of capacitance the unit is named after the english physicist michael faraday .a farad is the charge in coulombs which a capacitor will accept for the potential across it to change 1 volt a coulomb is 1 ampere second .example a capacitor with capacitance of 47 nf will increase by 1 volt per second with a 47 na input current farad.

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

Question 40-23 : Indicates rotor imbalance is directly proportional to engine speed varies inversely as the square of the engine speed is presented without any amplification or filtering

exemple 228 indicates rotor imbalance. — The engine vibration monitoring on a turbojet engine indicates any vibration resulting from an imbalance on the rotation parts of the engine engine vibration may occur due to fan blade/spinner icing resulting in a rotor imbalance indicates rotor imbalance.

6000 psi is approximately equivalent to ?

Question 40-24 : 400 bar 40 bar 4 bar 4000 bar

exemple 232 400 bar. — .1 psi pound per square inch = 0 07 bar .1 bar = 15 psi 400 bar.

1 bar equals how many pascals ?

Question 40-25 : 100000 pa 1000 pa 10 pa 100 pa

exemple 236 100000 pa. — .1 bar = 100000 pa pascal = 1000 hpa hectopascal 100000 pa.

What is the relation between c and k . c celsius° k kelvin ?

Question 40-26 : C=k 273 15 k=c 273 15 k=c1 8+32° c=k1 8+32°

exemple 240 c=k-273.15 — .fahrenheit = 1 8 x c + 32..kelvin = c + 273 15 c=k-273.15

Which of these statements about temperature units are correct or incorrect.1 ?

Question 40-27 : I is correct ii is correct i is incorrect ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

exemple 244 i is correct, ii is correct. — .fahrenheit = 1 8 x c + 32..kelvin = c + 273 15 i is correct, ii is correct.

Which of these statements are correct or incorrect.1 +15° celsius = 273 15° ?

Question 40-28 : I is incorrect ii is correct i is correct ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

exemple 248 i is incorrect, ii is correct. — .fahrenheit = 1 8 x c + 32..kelvin = c + 273 15 i is incorrect, ii is correct.

Which statement is correct regarding relation between kelvin k fahrenheit f ?

Question 40-29 : I is incorrect ii is correct i is correct ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

exemple 252 i is incorrect, ii is correct. — .fahrenheit = 1 8 x c + 32..kelvin = c + 273 15 i is incorrect, ii is correct.

Which of these statements are correct or incorrect.1 +15° celsius = 288 15° ?

Question 40-30 : I is correct ii is correct i is incorrect ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

exemple 256 i is correct, ii is correct. — .fahrenheit = 1 8 x c + 32..kelvin = c + 273 15 i is correct, ii is correct.

The correct relation is ?

Question 40-31 : 0 45 kg = 1 lb 4 5 kg = 1 lb 1 kg = 4 5 lb 1 kg = 0 45 lb

exemple 260 0.45 kg = 1 lb — Cqb15 february 2012...1 kg = 2 2 lbs.0 45 kg = 1 lb 0.45 kg = 1 lb

A pressure of 1013 25 hpa is corresponding to ?

Question 40-32 : 14 5 psi et 29 92 inhg 1 45 psi et 29 92 inhg 14 5 psi et 28 87 inhg 1 45 psi et 28 87 inhg

exemple 264 14.5 psi et 29.92 inhg. — .a pressure of 1013 25 hpa is corresponding exactly to 14 69596432068 psi and 29 92 inches of mercury 14.5 psi et 29.92 inhg.

Given .q = charge coulombs .u = potential difference between the plates volt ?

Question 40-33 : Q = c u q = u²/c q = c/u q = u/c

exemple 268 q = c.u — Chrism .should u not read v instead to comply with standard notation. .it should but we do not write the questions and we do not modify them this is the official wording.coulomb the quantity of electricity transported in 1 second by a current of 1 ampere .c is the capacitance and u is the stored energy q = c.u

20 bar is approximately equal to ?

Question 40-34 : 300 psi 10 psi 200 psi 40 psi

exemple 272 300 psi. — .1 psi pound per square inch = 0 07 bar .1 bar = 15 psi 300 psi.

The relation between c and k is . c celsius° k kelvin ?

Question 40-35 : K = c + 273 15 c k = 273 15 c = 0 8 k + 1 123 c = 273 + k

exemple 276 k = c + 273,15 — .fahrenheit = 1 8 x c + 32..kelvin = c + 273 15 k = c + 273,15

A pressure of 200 bar is equivalent to approximately ?

Question 40-36 : 3000 psi 300 psi 30 psi 3 psi

exemple 280 3000 psi. — .1 psi pound per square inch = 0 07 bar .1 bar = 15 psi 3000 psi.

Changes in temperature of the fuel affect its density volume and dielectric ?

Question 40-37 : A decreases in volume increases in density and increases in er a decreases in volume decreases in density and decreases in er an increases in volume increases in density and increases in er an increases in volume decreases in density and decreases in er

exemple 284 a decreases in volume, increases in density and increases in er. — Revised ecqb03 july 2016.warning this question also exists at the examm with the end statement an increase in temperature causes .in this case answer is an increase in volume decrease in density and decrease in er.mnemonic .decrease in temperature = d i i.increase in temperature = i d d a decreases in volume, increases in density and increases in er.

On a multi engine aircraft a synchroscope provides ?

Question 40-38 : An automatic and/or a visual system to synchronize the propellers rotation speeds a visual system to synchronize the propellers rotation speeds an automatic system to synchronize the propellers rotation speeds that any given blade of an engine propeller is in the same relative position as the corresponding blade of the propeller on the master engine

exemple 288 an automatic and/or a visual system to synchronize the propellers rotation speeds. — Cqb15 may 2012..on a multi engined aircraft a synchronizing system ensures the propeller speeds are all the same this is achieved by an electrical system that compares speed signals from engine mounted generators out of balance signals using one engine as a master signal are automatically corrected by electrically trimming the engine speeds until all signals are equal an automatic and/or a visual system to synchronize the propellers rotation speeds.

The parameters used to represent thrust are .1 n1 low pressure shaft speed .2 ?

Question 40-39 : 1 4 1 3 2 3 2 4

exemple 292 1, 4. — Ecqb03 july 2016 1, 4.

Which statement about fuel flow are correct or incorrect .i fuel flow may be ?

Question 40-40 : I is correct ii is correct i is incorrect ii is incorrect i is correct ii is incorrect i is incorrect ii is correct

exemple 296 i is correct, ii is correct. — Cqb15 may 2012...units used for fuel flow when measured by volume per hour are . liters/hour. us gallons/hour..units used for fuel flow when measured by mass per hour . kilogrammes/hour. pounds/hour i is correct, ii is correct.

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