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Regulation > weather : In a vibration monitoring system a filter .1 erases any output which is normal ?

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

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 exemple 141 1 is correct, 2 is correct.1 is correct, 2 is correct.

Torque measurement is based on ?

Question 41-2 : Twist of the torque shaft of a known length pt7/pt2 pt2/pt7 change in frequency between torque shaft and reference shaft

.torque can also be determined by measuring the change in phase between the torque shaft and the reference shaft exemple 145 twist of the torque shaft of a known length.twist of the torque shaft of a known length.

For an engine vibration indicator vibration monitoring system ?

Question 41-3 : 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

Feedback cqb15 may 2012... no specific unit is displayed for a vibration monitoring system exemple 149 no specific unit is displayed.no specific unit is displayed.

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

Question 41-4 : P=tn p=t/n p=tn² p=t/n²

exemple 153 p=tnp=tn

A unit commonly used to calculate fuel flow consumption is ?

Question 41-5 : Kg/h h/kg kg/m3 lb/m3

The following units are used for fuel flow when measured by mass per hour . kilogrammes/hour. pounds/hour..the following units used for fuel flow when measured by volume per hour . liters/hour. us gallons/hour exemple 157 kg/h.kg/h.

The pressure is measured by ?

Question 41-6 : A force per unit area a force on a volume a volume on a force a volume per unit area

exemple 161 a force per unit area.a force per unit area.

Which of the following components converts heat into a mechanical movement ?

Question 41-7 : A bi metallic strip a thermo couple a resistance a spring

. 1031.a bimetallic strip is used to convert a temperature change into mechanical displacement the strip consists of two strips of different metals which expand at different rates as they are heated usually steel and copper or in some cases steel and brass the strips are joined together throughout their length by riveting brazing or welding the different expansions force the flat strip to bend one way if heated and in the opposite direction if cooled below its initial temperature.the metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled exemple 165 a bi-metallic strip.a bi-metallic strip.

A torque may be expressed in ?

Question 41-8 : N m n/m watt rpm

The following units are used for torque . newton meters. inch or foot pounds exemple 169 n.mn.m

The different types of tachometers are.1 electrical.2 mechanical.3 ?

Question 41-9 : 1 2 3 1 2 1 3 2 3

.the following types of tachometers are used in aviation . mechanical rotating magnet . electrical three phase tacho generator . electronic impulse measurement with speed probe and phonic wheel exemple 173 1, 2, 3.1, 2, 3.

By integrating a flow with respect to time we obtain ?

Question 41-10 : A volume or a mass a pressure the diameter of the line the cross section of the line

Cqb15 august 2012..the following units are used for fuel flow when measured by mass per hour . kilogrammes/hour. pounds/hour..the following units used for fuel flow when measured by volume per hour . liters/hour. us gallons/hour exemple 177 a volume or a mass.a volume or a mass.

On a multi engine aircraft a synchroscope provides ?

Question 41-11 : Qualitative indication of the difference in speed between the engines quantitative indication in rpm of the difference in speed between the engines qualitative indication of the difference in vibration between the engines quantitative indication in hz of the difference in speed between the engines

Cqb15 august 2012..synchroscope example of display.beechcraft baron 58 cockpit

The operating principle of an oil torque meter is .1 axial movement is ?

Question 41-12 : 1 is correct 2 is correct 1 is incorrect 2 is incorrect 1 is correct 2 is incorrect 1 is incorrect 2 is correct

Revised ecqb03 july 2016 exemple 185 1 is correct, 2 is correct.1 is correct, 2 is correct.

On an twin engined aeroplane the synchroscope uses the following principle ?

Question 41-13 : It measures the frequency difference between the two engines driven alternators a piezoelectric sensor measures the vibrations on each engine it mathematically subtracts the rpm of both engines it mathematically subtracts the vibrations of both engines

Revised ecqb03 july 2016..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 engines driven alternators 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 oil torque meter makes use of the followings phenomenon ?

Question 41-14 : Axial movement is generated when hellicaly cut gears are used to transfer power from one shaft to another as power is increased the torque shaft expands the torque shaft is connected to the engine only axial movement is generated when cylindricaly cut gears are used to transfer power from one shaft to another as power is increased the torque shaft twists the torque shaft is connected to both the engine and the propeller's reduction gear box

Cqb15 august 2012 exemple 193 axial movement is generated when hellicaly cut gears are used to transfer power from one shaft to another.axial movement is generated when hellicaly cut gears are used to transfer power from one shaft to another.

On an electronic display unit the source of the vibrations sensed by an engine ?

Question 41-15 : Can be displayed n1 or n2 can be displayed only for n1 can be displayed only for n2 can not be displayed

exemple 197 can be displayed (n1 or n2).can be displayed (n1 or n2).

On an electronic display unit the following n1 parameters can be displayed .1 ?

Question 41-16 : 1 2 3 1 1 3 2 3

Ecqb03 july 2016 exemple 201 1, 2, 3.1, 2, 3.

On a n1 indicator the maximum n1 admissible ?

Question 41-17 : May be greater than 100% is 100% is always lower than 100% can not be reached

exemple 205 may be greater than 100%.may be greater than 100%.

Concerning thrust measurement the n1 is defined as the ?

Question 41-18 : Low pressure shaft speed high pressure shaft speed egt epr

exemple 209 low pressure shaft speed.low pressure shaft speed.

Engine speed is most commonly displayed as a ?

Question 41-19 : Percentage of a maximum engine speed percentage of a minimum engine speed a pressure ratio fan rotation speed

exemple 213 percentage of a maximum engine speed.percentage of a maximum engine speed.

A fuel flow meter is located ?

Question 41-20 : In the high pressure fuel line to the burners at the outlet of the high pressure fuel pump between the booster pump and the engine in the return line to the tanks

Ecqb03 july 2016 exemple 217 in the high pressure fuel line to the burners.in the high pressure fuel line to the burners.

Fuel flow can be expressed in .1 kg per m3.2 lb per m3.3 lb per hour.4 kg per ?

Question 41-21 : 3 4 1 2 1 4 2 3

Ecqb03 july 2016..the following units are used for fuel flow when measured by mass per hour . kilogrammes/hour. pounds lb /hour..the following units used for fuel flow when measured by volume per hour . liters/hour. us gallons/hour exemple 221 3, 4.3, 4.

Total fuel consumption is obtained by ?

Question 41-22 : Integrating the fuel flow with respect to time subtracting the initial fuel quantity from the remaining fuel integrating the fuel flow with respect to distance subtracting the remaining fuel from the initial fuel quantity

Ecqb03 july 2016 exemple 225 integrating the fuel flow with respect to time.integrating the fuel flow with respect to time.

Which of these statements about fuel quantity measurement are correct or ?

Question 41-23 : 1 is correct 2 is correct 1 is incorrect 2 is incorrect 1 is incorrect 2 is correct 1 is correct 2 is incorrect

Ecqb03 july 2016 exemple 229 1 is correct, 2 is correct.1 is correct, 2 is correct.

Which of these statements about the fuel mass unit is correct ?

Question 41-24 : 1 t = 2200 lb 1 t = 2000 lb 1 t = 450 lb 1 t = 4500 lb

.1 kg = 2 2 pounds lbs exemple 233 1 t = 2200 lb1 t = 2200 lb

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

Question 41-25 : C = q / u c = u / q c = q x u c = u² / q

Ecqb03 july 2016...c is the capacitance coulomb is the quantity of electricity transported in 1 second by a current of 1 ampere and u is the stored energy exemple 237 c = q / uc = q / u

The value shown by the indicator of a vibration monitoring system is 4 this is ?

Question 41-26 : A level of vibration without any unit 4 % 4 hz 4 % or 4 hz depending on the aircraft

. 1029.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

The types of sensors used in an engine vibration monitoring system may be .1 ?

Question 41-27 : 1 3 1 2 1 2 3 2

Ecqb03 july 2016 exemple 245 1, 3.1, 3.

On a twin engined aeroplane the synchroscope can consist of ?

Question 41-28 : A rotor fed by the alternator driven by the master engine and a stator fed by the alternator driven by the engine to by synchronised a piezoelectric sensor measuring the vibrations on each engine a computer that mathematically subtracts the rpm of both engines a computer that mathematically subtracts the vibrations of both engines

Ecqb03 july 2016...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 engines driven alternators 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.synchroscope example of display.beechcraft baron 58 cockpit

Vibration is indicated in the cockpit as ?

Question 41-29 : A direct reading a frequency proportional to the speed of the motor inversely proportional to the speed of the motor

Revised ecqb03 july 2016..the engine vibration monitoring on a turbojet engine indicates any vibration resulting from an imbalance on the rotation parts of the engine.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. 1029. no specific unit is displayed for a vibration monitoring system exemple 253 a direct reading.a direct reading.

Given .p = power.t = torque.omega = angular velocity.the correct relationship is ?

Question 41-30 : P = t x omega t = p x omega p = t² x omega t = p / omega

exemple 257 p = t x omegap = t x omega

The magnitude of a torque is defined as ?

Question 41-31 : Force times its lever arm force times its moment force times its area force per unit of volume

exemple 261 force times its lever arm.force times its lever arm.

The operating principle of an electronic torque meter is ?

Question 41-32 : As power is increased the torque shaft twists as power is decreased the torque shaft twists as power increases the torque shaft lengthens as power increases the torsion shaft shrinks

exemple 265 as power is increased, the torque shaft twists.as power is increased, the torque shaft twists.

If the outside temperature at 35 000 feet is 40°c the local speed of sound is ?

Question 41-33 : 595 kt 247 kt 307 kt 686 kt

.lss varies with the square root of absolute temperature .formula lss = 39 x square root of oat+273.lss = 39 x square root of 233.lss = 595 kt exemple 269 595 kt.595 kt.

The error in altimeter readings caused by the variation of the static pressure ?

Question 41-34 : Position error barometric error instrument error hysteresis effect

Variation of the static pressure near the source is known as position error .barometric error is caused by setting the wrong number in the altimeter window .instrument error is caused by the imperfections of manufacture .hysteresis errors are caused by the irregular elasticity of the capsule exemple 273 position error.position error.

If the static source of an altimeter becomes blocked during a descent the ?

Question 41-35 : Continue to display the reading at which the blockage occurred gradually indicate zero under read indicate a height equivalent to the setting on the millibar subscale

exemple 277 continue to display the reading at which the blockage occurredcontinue to display the reading at which the blockage occurred

If the static source to an altimeter becomes blocked during a climb the ?

Question 41-36 : Continue to indicate the reading at which the blockage occurred over read under read by an amount equivalent to the reading at the time that the instrument became blocked gradually return to zero

exemple 281 continue to indicate the reading at which the blockage occurred.continue to indicate the reading at which the blockage occurred.

If the static source to an airspeed indicator asi becomes blocked during a ?

Question 41-37 : Over read read zero continue to indicate the speed applicable to that at the time of the blockage under read

. 959..the asi is a sensitive differential pressure gauge which measures and promptly indicates the difference between pitot total pressure and static pressure total pressure static pressure = dynamic pressure .these two pressures are equal when the aircraft is parked on the ground in calm air .when the aircraft moves through the air the pressure on the pitot line becomes greater than the pressure in the static lines this difference in pressure is registered by the airspeed pointer on the face of the instrument.thus while descending the total pressure increases* and the static pressure from the static source does not your airspeed indicator will over read.*while descending density increases so total pressure increases exemple 285 over-read.over-read.

A leak in the pitot total pressure line of a non pressurized aircraft to an ?

Question 41-38 : Under read over read over read in a climb and under read in a descent under read in a climb and over read in a descent

.airspeed indicator asi.the asi is a sensitive differential pressure gauge which measures and promptly indicates the difference between pitot impact/dynamic pressure and static pressure these two pressures are equal when the aircraft is parked on the ground in calm air when the aircraft moves through the air the pressure on the pitot line becomes greater than the pressure in the static lines this difference in pressure is registered by the airspeed pointer on the face of the instrument which is calibrated in miles per hour knots nautical miles per hour or both. 980..airspeed indication on the airspeed indicator is .total pressure static pressure = dynamic pressure.therefore with a leak in the pitot total pressure line it is similar to a reduction of speed a reduction of the relative flow entering in the pitot tube the airspeed indicator will under read exemple 289 under-read.under-read.

Machmeter readings are subject to ?

Question 41-39 : Position pressure error density error temperature error setting error

.machmeter errors .mach number is proportional to the ratio of pitot pressure to static pressure ie to pt ps /ps and this is exaclty what the machmeter measures thus any non standard temperature or density do not affect the accuracy of the machmeter and the only error worth considering is the pressure position error in addition to the usually small instrument error.a mach meter can be considered accurate to within +/ 0 01 mach in the normal operating range or to within +/ 0 02 at the limits of that range exemple 293 position pressure error.position pressure error.

Vno is the maximum speed ?

Question 41-40 : Not to be exceeded except in still air and with caution which must never be exceeded at which the flight controls can be fully deflected with flaps extended in landing position

exemple 297 not to be exceeded except in still air and with caution.not to be exceeded except in still air and with caution.

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