In a compensated capacitance type quantity indicating system the contents gauge ? [ Regulation weather ]

Question 41-1 : Remain the same increase by 5% decrease by 5% increase by 10%

exemple 141 Remain the same. — Admin .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 41-2 : 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 145 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 41-3 : 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 149 Capacity of a capacitor depends on the nature of the dielectric in which it is immersed. — Admin .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 41-4 : 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 153 Remains constant during level flight, increases during a climb and decreases during a descent. — Admin .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 41-5 : 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 157 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 41-6 : 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 161 Always filtered to remove unwanted frequencies. — Admin .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 41-7 : 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

exemple 165 Pressure probes, one located upstream from the compressor inlet, and the other downstream from the turbine outlet. — Pressure probes, one located upstream from the compressor inlet, and the other downstream from the turbine outlet.

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

Question 41-8 : 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 169 Propeller generates vibration, continuous rating is forbidden — Propeller generates vibration, continuous rating is forbidden

A three phase electrical tachometer consists of ?

Question 41-9 : 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

exemple 173 A three-phase generator, a synchronous motor and a magnetic tachometer. — A three-phase generator, a synchronous motor and a magnetic tachometer.

Cas can be obtained from the following data ?

Question 41-10 : Eas and pressure altitude eas and density altitude tas and pressure altitude tas and density altitude

exemple 177 Eas and pressure altitude. — Admin .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 41-11 : 1 2 3 1 2 1 3 2 3

Admin .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

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

Question 41-12 : 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 185 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 41-13 : 4 1 2 3 4 1 3 4 1

A magnetic tachometer consists of ?

Question 41-14 : 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 193 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 41-15 : Capacitance = e x a / d capacitance = e x d / a capacitance = a x d / e capacitance = e x d x a

exemple 197 Capacitance = e x a / d — Capacitance = e x a / d

A three phase electrical tachometer utilises a generator feeding ?

Question 41-16 : A synchronous motor turning a drag cup directly a voltmeter directly a galvanometer directly a drag cup

exemple 201 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 41-17 : 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 205 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 41-18 : Farad hz joule watt

exemple 209 Farad. — Admin .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 41-19 : 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 213 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 41-20 : 400 bar 40 bar 4 bar 4000 bar

exemple 217 400 bar. — Admin .1 psi pound per square inch = 0 07 bar .1 bar = 15 psi 400 bar.

1 bar equals how many pascals ?

Question 41-21 : 100000 pa 1000 pa 10 pa 100 pa

exemple 221 100000 pa. — Admin .1 bar = 100000 pa pascal = 1000 hpa hectopascal 100000 pa.

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

Question 41-22 : C=k 273 15 k=c 273 15 k=c1 8+32° c=k1 8+32°

exemple 225 C=k-273.15 — Admin .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 41-23 : 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 229 I is correct, ii is correct. — Admin .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 41-24 : 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 233 I is incorrect, ii is correct. — Admin .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 41-25 : 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 237 I is incorrect, ii is correct. — Admin .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 41-26 : I is correct ii is correct i is incorrect ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

Admin .fahrenheit = 1 8 x c + 32.kelvin = c + 273 15

The correct relation is ?

Question 41-27 : 0 45 kg = 1 lb 4 5 kg = 1 lb 1 kg = 4 5 lb 1 kg = 0 45 lb

exemple 245 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 41-28 : 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

Admin .a pressure of 1013 25 hpa is corresponding exactly to 14 69596432068 psi and 29 92 inches of mercury

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

Question 41-29 : Q = c u q = u²/c q = c/u q = u/c

exemple 253 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 41-30 : 300 psi 10 psi 200 psi 40 psi

exemple 257 300 psi. — Admin .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 41-31 : K = c + 273 15 c k = 273 15 c = 0 8 k + 1 123 c = 273 + k

exemple 261 K = c + 273,15 — Admin .fahrenheit = 1 8 x c + 32.kelvin = c + 273 15 K = c + 273,15

A pressure of 200 bar is equivalent to approximately ?

Question 41-32 : 3000 psi 300 psi 30 psi 3 psi

exemple 265 3000 psi. — Admin .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 41-33 : 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 269 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 41-34 : 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 273 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 41-35 : 1 4 1 3 2 3 2 4

exemple 277 1, 4. — Ecqb03 july 2016 1, 4.

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

Question 41-36 : 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 281 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.

In a vibration monitoring system a filter .1 erases any output which is normal ?

Question 41-37 : 1 is correct 2 is correct 1 is incorrect 2 is incorrect 1 is incorrect 2 is correct 1 is correct 2 is incorrect

exemple 285 1 is correct, 2 is correct. — Revised ecqb03 july 2016 ..the gas turbine aircraft engine vibration indicating system features include engine c s rotation frequency measurement with two independent measuring channels vibration level measurement with multiple engine mounted piezoelectric sensors using digital broadband filters on each vibration sensor or digital monitoring narrow band filters on c s main harmonics frequencies as well as a comparison of measured and extreme limits of vibration 'excessive vibration' and 'vibration limit' signals formed when limits are exceeded .. no specific unit is displayed for a vibration monitoring system 1 is correct, 2 is correct.

Torque measurement is based on ?

Question 41-38 : Twist of the torque shaft of a known length pt7/pt2 pt2/pt7 change in frequency between torque shaft and reference shaft

exemple 289 Twist of the torque shaft of a known length. — Admin .torque can also be determined by measuring the change in phase between the torque shaft and the reference shaft Twist of the torque shaft of a known length.

For an engine vibration indicator vibration monitoring system ?

Question 41-39 : No specific unit is displayed rotor imbalance is shown as a percent of n1 rotor imbalance is mesured by pounds per unit of time vibrations are proportional to torque

exemple 293 No specific unit is displayed. — Feedback cqb15 may 2012 .. no specific unit is displayed for a vibration monitoring system No specific unit is displayed.

Given .p = power t = torque n = rpm.the correct relationship is ?

Question 41-40 : P=tn p=t/n p=tn² p=t/n²

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