Module 15 GTE Past Paper PDF 2022

## B1 Mod. 15 GTE (1 of 2022) ### 23 - Purpose of shroud. - Prevent bladetip loss and excessive vibration. - Allow to rotate compressor with high speed. - Twist the blade towards the low pitch ### 24 - In turboshaft engine, the output shaft may be coupled to the engine turbine or the s...

## B1 Mod. 15 GTE (1 of 2022) ### 23 - Purpose of shroud. - Prevent bladetip loss and excessive vibration. - Allow to rotate compressor with high speed. - Twist the blade towards the low pitch ### 24 - In turboshaft engine, the output shaft may be coupled to the engine turbine or the shaft may be driven by a turbine of it's own. - Free-turbine - Fixed-turbine - Both ### 25 - MTCS about Turboshaft engine - High power output, high reliability, small size & lightweight. - High power output, less reliability, small size & lightweight. - Less power output, high reliability, & light weight ### 26 - Energy is extruded to drive the high ratio RGB which is in a helicopter transmission. - 2/3 V₃ - 3/2 ### 27 - A load compressor of APU is dedicated to provide - Pneumatic air - Electrical - Both ### 28 - MTLS about APU - Used in ground and air. - Used in ground only. - Used when ground power support is available. ### 29 - Humidity indicator on engine stored in shipping case - are inspected - Every 30 days - Every 60 days - After local condition change. ### 30 - At what point should desiccants within a storage container be replaced. - More than 30% humidity. - Less than 30% humidity. - After the colour change. ### 31 - Ball bearing takes load. - Radial - Axial - Both ### 32 - Marking material for combustion section port that are mark which are directly exposed in gas path. - Lay-out die or chalk. - Metallic pencil - Wax Pencil ### 33 - Basic parameter for describing the fuel economy of GTE. - Fuel measured in lb/hr - SFC - Thrust produced in 1 hr. - All ### 34 - Advantage of forward fan engine. - Reduce vibration and noise. - Provide enough air to the compressor. - Reduce the chance FOD ### 35 - MTCS about post exit thrust reverses. - Is accomplished by placing an obstruction in jet exhaust stream. - Nozzles are turned fwd. by blocked door - Both. ### 36 - NTS (Negative torque signal) control system provide a signal which: - ↑ propeller blade angle to limit negative torque. - ↑ propellar angle to limit feathering. ### 37 - Turbo-propeller control assemblies have a feathering system that feather the propeller when. - Engine is shut-down on ground - Engine is shut-down in flight. - Both. ### 38 - Cross feed valve. - Enable engines feed from any tank - Fuel transferred both tank - Fuel feed from RH engine to LH engine. ### 39 - High resistance bearing - Ball bearing - Plain bearing - Roller bearing - D.T.C ### 40 - Blade fits in the disk of turbine blade - NGU - Turbine assembly ### 41 - In can-type combustion chamber spread the fuel during initial starting is accomplished by: - Interconnecting tube. - Spark igniter - Fuel nozzle ### 42 - Function of swirl vane - High flow speed for better mixing of fuel and air. - It lowers the swirling action. - It has high velocity ### 43 - Bryton cycle - One constant pressure and two adiabatic process ### 44 - MTCS about Bernoulli's principle. - Static pressure of fluid ↑ and the velocity of fluid ↑ - Static pressure of fluid ↓ then velocity of fluid ↑ - Static pressure of fluid ↑ at point where velocity ↑ provide no energy is added OR not taken away. ### 45 - In Axial flow compressor - High AOA the compressor stall is high. ### 46 - Disadvantage of hydraulic starters. - Require external power for large engine OR for continuous cranking. - Limited to small engine - No motoring is possible for system checkout - All ### 47 - Rich blowout occurs when - Fuel become excessive. - Excessive air - Oxygen is insufficient. ### 48 - Spur gear ### 49 - Ball bearing take load? - Axial - Radial - Both ### 50 - The amount of air passing through the engine depend upon. - The comp. speed (RPM). - And speed of A/C - Density of ambient air. - All ### 51 - Diffuser is an annular chamber provided with the no. of forming series of passages. - Divergent - Convergent - Convergent-divergent ### 52 - The amount of air pass from fan by pass compared to the amount of air that flow through. - The engine - The engine core - From fan to the engine core. ### 53 - Ignition system used in GTE. - Ignite the fuel of high temp. of high pressure. - Ignite the fuel at low temp. & low pressure. - Ignite the fuel at high temp. high velocity high pressure. ### 54 - MTCS about engine PE. Ratio [EPR3] - Inlet of the compressor to the turbine exhaust area - Inlet of the compressor to the compressor exhaust area. - Only (a) is correct. - Both (a) & (b) is correct ### 55 - Rise in PR. above existing outside atmospheric PR. at engine inlet, as a result of the Fird. velocity of an A/C is called. - Ram pressure - Inlet duct efficiency - Thrust pressure ### 56 - Inlet duct used in subsonic A/C: - Convergent - Divergent - Divided entrance duct ### 57 - Thrust in GTE ↑ by: - ↑ the mass flow of air through the engine - ↑ gas velocity - Both ### 58 - Acceleration formula for determine jet thrust of GTE - $F=\frac{m(CV2-V1)}{g}$ - $F= G(\frac {V2-V1}{g_{is}})$ - $F= mr (V_i - V_2)$ ### 59 - Important factors affecting the thermal efficiency of GTE: - TIT, compressor ratio and the component efficiency of the compressor and turbine. - TET, EPR and density of ambient air. - TIT, CIT & Burner pressure. ### 60 - If the off section of an inlet duct ↑ in size, then the air velocity as it approaches the compressor ### 61 - Oil inlet temp. is also an indicator of proper operation of - Oil pump discharge pressure. - Engine oil cooler - Output oil pressure ### 62 - GTE ignition system - Ignite the fuel in the combustion then switch off ### 63 - Engine vibrates throughout RPM range, but indicated as amplitude reduces as RPM is reduced. - Turbine damage - Compressor damage - Damage in engine accessory. ### 64 - Thrust produced by large turbo-fan engine - 80% - 50% - 100% ### 65 - Speed prob of generator - It is positioned on diffuser casing in line with phoric wheel. - It is positioned in compressor casing. ### 66 - The hot air prevent the forming of ice called. - Anti-icing - De-icing - Both. ### 67 - When water is added at the front compressor, power augmentation depend upon. - ↑ density and mass flow ↑ - ↑ density and mass flow - ↑ density, mass flow and also turbine temp. ↑ ### 68 - Ball and roller bearings are preferred largely due to. - Offer little rotational resistance. - Simple to cool and lubricate, easily replaced. - Inexpensive - All ### 69 - Engine and main rotor shaft to allows for autorotation without driving the rotor - Free-wheeling unit or - Over-running clutch. - Both - Spray clutch is also used for this purpose. ### 70 - Vibration isolator engine mount. - Fwd. isolator engine mount carry verticle, side axial (thrust). - Aft. isolator engine mount carry verticle and axial - + they will accommodate thermal expansion of engine with applying axial load. ### 71 - MTCS about convergent-divergent - Inlet duct: subsonic - supersonic - Supersonic – Subsonic - Subsonic - transonic - Turbine case cooling - Acc - Turbine expansion valve. - Cooling turbine and blanket. ### 72 - Pressure relief valve system - The oil flow to the bearing chamber is controlled by limiting the pressure in feed line. - It accomplished by spring loaded valve, which allow oil returned from the pro pump inlet. - In pro-relief valve oil flow ↑ as engine speed ↓ - All ### 73 - Hot-air for anti-icing in GTE are controlled by - Bleed valve. - Pneumatic valve. - Surge vane ### 74 - Installed engine should be removed. - 6 week - After 6 month - After 30 days ### 75 - The purpose of centrifugal switch in APU - Starting and ignition ckt. - Governed speed indication ckt. - Overspeed protection ckt. - All ### 76 - Compressor wash [MTCS] - Entire gas path should be wash - Compressor section only - Compressor, turbine and combustion section should be wash ### 77 - Volatility of fuel - It means at high temp. liquid is above vapor pressure - It means at high temp. liquid is below vapor pressure. - It means a liquid is converted to a vapor ### 78 - Oil is used in GTE - Petroleum based oil - Mineral based oil - Synthetic based oil ### 79 - Growth of blade (creep) is a result due to - on turbine blade. - Excessive centrifugal load and over temp. - Excessive centipetal load and over temp. - Excessive vibration and over temp. ### 80 - Stator motor automatically disengage stator driver exceed output shaft speed. - Output shaft - Splined output shaft - Internal governor speed. - All ### 81 - MTCS about turboprop engines: - Two types of turbine in turboprop they are free turbine & fixed turbine. - Fixed turbine are connected to two independent shaft. - Free turbine are connected to single shaft. - All. ### 82 - APU used in. - Main engine starting. - In-flight emergency - Ground support is not available. - All ### 83 - FADEC - FADEC A channel contain one channel. - FADEC system there are two channel. - Channel A and channel B are linked together by internal mating connector for crosstalk termination. - The stator is equipped within out-put splignshaft having a shear section that permit the shaft to shear if. - Torque to the engine during starting cycle is exot. - Torque to the engine cycle during starting is low. - Shaft torque to the engine is stopped. ### 84 - Engine maintenance is made easier by the incorporation of system for. - Engine monitoring and fault isolation. - Automatic EPR control. - Limit protection. ### 85 - MTCS about internal air system - Internal airflow which directly contribute to the engine thrust. - Up to 1/5 of the total engine core mass airflow may be wed for various function. - Internal air is used for bearing cooling. ### 86 - Fize detection system depend upon the temp. rise - Lindberg - Thermocouple switch. - Thermocouple. ### 87 - Jet oil II is a type of fuel. - Type I - Type II - Type III ### 88 - The air turbine stators convert. - Compressed air to shaft power - Shaft power to compressed air. ### 89 - MTCS about principle of afterburner - Jet pipe of afterburner jet pipe is smaller than normal jet pipe - Jet pipe is fitted with either two-position OR • variable area propelling nozzle. - The nozzle is open when afterburner is not in used. - All ### 90 - Most commonly used for fast detection of fire detectors - Rate of rise, rotation sensing, and overheat. - Rate of rise, tulint smoke, and overheat. - Optical fibre, rate of rise, and overheat. ### 91 - MTCS about integrated engine pressure ratio [TEPR] - Integrated avenge of fan and gas generator exhaust pressure divided by inlet total pressure. - Integrated avenge of gas generator exhaust pressure divided by inlet total pressure. - Integrated avenge of compressor discharge pressure divided by inlet total pressure. - Finest. ### 92 - In lubrication system, which filter among them is finest. - Wise mesh - Screen disk - Finger screen. - All ### 93 - Contamination in fuel is most prominent in jet fuel. - Water + microbes - Solid particle. - Icing. - All. ### 94 - Synthetic oil are largely used GTE because of. - It have a low viscosity for good flowability on low volatile. - It has high vapor pressure. - It has low smoke and low Reid vapor pressure. ### 95 - MTCS about propelling nozzle. - Exhaust gases are pass to the atmosphere through propelling nozzle. - It has a divergent duct to ↑ the velocity. - Exhaust gases is supersonic at low thrust condition. - All. ### 96 - Turbine transfers velocity energy to mechanical energy to drive - Compressor and accessories. - ACG and gas generator. - Fwd with compressor and accessories. ### 97 - The seal is pressurised to minimize oil leakage along the compressor shaft. - Labyrinth seal - Thread-seal - Carbon seal ### 98 - Advantage of synthetic oil over petroleum oil. - It has a lower tendency to deposit lacquer + coke. - It has a higher tendency to deposit lacquer & it evaporates the solvent from the oil at high temperature. ### 99 - Stater motor connected to. - RGB - The gas generator - The free turbine ### 100 - Torque meter assembly connected to. - Engine to RGB - Engine to propeller - RGB to engine. ### 101 - Vapor lock due to. - Low pressure, high temp, and excessive turbulence. - High pressure, high temp and excessive turbulence. - Low pressure, low temp and low turbulence. ### 102 - Procedure for persevering and depreserving GTE depend upon - Length if inactivity. - Type of preservative wed. - Whether or not the engine may be rotated during the inactive period ### 103 - Halon 1301 - Bromotriflura methane (Feron 13th) - Bromo chlorodifluro methane (Halon 1211) - Chlorobromethane (Halon 1011) ### 104 - In fuel manifold drain valve it designed to drain the manifold when the fire. - Fuel pressure is drop below a certain amount, when the engine is stopped to prevent fuel from dripping into the combustion chamber. - It is closed by fuel pressure within the manifold, when the engine is stopped. - Both. ### 105 - Most commonly used electrical oil temp. gauge - Ratiometer and wheastone bridge. - Bourden tube. - Diaphragm capsule ### 106 - To lift water and debris such as stone sand, and small hardware from ground and direct into engine ore elevated by. - Vortex dissipates. - Parallel fan - Inlet screen ### 107 - Fize detector false warning due to. - Dirt, Swaf or FOD. - Detection element too close to the heat shield. - Inadequate tightening of connectors. - All ### 108 - Which if the following is not a fun. of centrifugal switch of APU - Starting & ignition ckt. - Governor speed indication ckt. - Overspeed protection ckt. - Switching ckt. ### 109 - Thrust augmentation in GTE is achieved by adding water at. - Compressor inlet - Exhaust section - Diffuser ### 110 - MTCS about turboshaft engine - Drive shaft contain short shaft with two flexible coupling. - Shaft is rigid and two attackable coupling attached each end. - Both + Prevent misalignment.