Question 55-1 : Given .q = charge coulombs .u = potential difference between the plates volt .c= capacitance farads .the correct relationship between these parameters is ? [ Objective Licence ]
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
Question 55-2 : 20 bar is approximately equal to ?
300 psi
Admin .1 psi pound per square inch = 0 07 bar .1 bar = 15 psi
Question 55-3 : The relation between c and k is . c celsius° k kelvin ?
K = c + 273 15
Admin .fahrenheit = 1 8 x c + 32.kelvin = c + 273 15
Question 55-4 : A pressure of 200 bar is equivalent to approximately ?
3000 psi
Admin .1 psi pound per square inch = 0 07 bar .1 bar = 15 psi
Question 55-5 : Changes in temperature of the fuel affect its density volume and dielectric value er .a decrease in temperature causes ?
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
Question 55-6 : On a multi engine aircraft a synchroscope provides ?
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
Question 55-7 : The parameters used to represent thrust are .1 n1 low pressure shaft speed .2 n2 high pressure shaft speed .3 egt.4 epr.the combination that regroups all of the correct statements is ?
1 4
Ecqb03 july 2016
Question 55-8 : Which statement about fuel flow are correct or incorrect .i fuel flow may be measured by volume per unit of time .ii fuel flow may be measured by mass per unit of time ?
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
Question 55-9 : In a vibration monitoring system a filter .1 erases any output which is normal to the engine.2 allows through to the amplifier any frequency that is considered to be harmful to the engine ?
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
Question 55-10 : Torque measurement is based on ?
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
Question 55-11 : For an engine vibration indicator vibration monitoring system ?
No specific unit is displayed
Feedback cqb15 may 2012 .. no specific unit is displayed for a vibration monitoring system
Question 55-12 : Given .p = power t = torque n = rpm.the correct relationship is ?
P=tn
Question 55-13 : A unit commonly used to calculate fuel flow consumption is ?
Kg/h
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
Question 55-14 : The pressure is measured by ?
A force per unit area
Question 55-15 : Which of the following components converts heat into a mechanical movement ?
A bi metallic strip
Admin . 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
Question 55-16 : A torque may be expressed in ?
N m
The following units are used for torque . newton meters. inch or foot pounds
Question 55-17 : The different types of tachometers are .1 electrical.2 mechanical.3 electronic.the combination that regroups all of the correct statements is ?
1 2 3
Admin .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
Question 55-18 : By integrating a flow with respect to time we obtain ?
A volume or a mass
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
Question 55-19 : On a multi engine aircraft a synchroscope provides ?
Qualitative indication of the difference in speed between the engines
Cqb15 august 2012 ..synchroscope example of display .beechcraft baron 58 cockpit
Question 55-20 : The operating principle of an oil torque meter is .1 axial movement is generated by helically cut gears.2 axial force is proportional to the torque ?
1 is correct 2 is correct
Revised ecqb03 july 2016
Question 55-21 : On an twin engined aeroplane the synchroscope uses the following principle ?
It measures the frequency difference between the two engines driven alternators
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
Question 55-22 : An oil torque meter makes use of the followings phenomenon ?
Axial movement is generated when hellicaly cut gears are used to transfer power from one shaft to another
Cqb15 august 2012
Question 55-23 : On an electronic display unit the source of the vibrations sensed by an engine vibration monitoring system ?
Can be displayed n1 or n2
Question 55-24 : On an electronic display unit the following n1 parameters can be displayed .1 present n1.2 commanded n1.3 maximum n1 operating limit.the combination that regroups all of the correct statements is ?
1 2 3
Ecqb03 july 2016
Question 55-25 : On a n1 indicator the maximum n1 admissible ?
May be greater than 100%
Question 55-26 : Concerning thrust measurement the n1 is defined as the ?
Low pressure shaft speed
Question 55-27 : Engine speed is most commonly displayed as a ?
Percentage of a maximum engine speed
Question 55-28 : A fuel flow meter is located ?
In the high pressure fuel line to the burners
Ecqb03 july 2016
Question 55-29 : Fuel flow can be expressed in .1 kg per m3.2 lb per m3.3 lb per hour.4 kg per hour.the combination that regroups all of the correct statements is ?
3 4
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
Question 55-30 : Total fuel consumption is obtained by ?
Integrating the fuel flow with respect to time
Ecqb03 july 2016
Question 55-31 : Which of these statements about fuel quantity measurement are correct or incorrect .1 the quantity of fuel can be measured by volume.2 the quantity of fuel can be measured by mass ?
1 is correct 2 is correct
Ecqb03 july 2016
Question 55-32 : Which of these statements about the fuel mass unit is correct ?
1 t = 2200 lb
Admin .1 kg = 2 2 pounds lbs
Question 55-33 : Given .q = charge coulombs .u = potential difference between the plates volt .the capacitance c farads is defined as ?
C = q / u
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
Question 55-34 : The value shown by the indicator of a vibration monitoring system is 4 this is ?
A level of vibration without any unit
Admin . 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
Question 55-35 : The types of sensors used in an engine vibration monitoring system may be .1 magnetic.2 tachometer.3 piezo electric crystal.the combination that regroups all of the correct statements is ?
1 3
Ecqb03 july 2016
Question 55-36 : On a twin engined aeroplane the synchroscope can consist of ?
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
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
Question 55-37 : Vibration is indicated in the cockpit as ?
A direct reading
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
Question 55-38 : Given .p = power.t = torque.omega = angular velocity.the correct relationship is ?
P = t x omega
Question 55-39 : The magnitude of a torque is defined as ?
Force times its lever arm
Question 55-40 : The operating principle of an electronic torque meter is ?
As power is increased the torque shaft twists
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