Bruca FCL QB 1
A magnetic plug in an engine's oil system can be used to: A. collect ferrous particles. B. prevent metallic particles from entering the oil system. C. collect static electricity. D. collect carbon found in the oil.
A
A manifold pressure gauge of a piston engine measures: A. absolute pressure in intake system behind the throttle valve. B. absolute air pressure entering the carburettor. C. fuel pressure leaving the carburettor. D. vacuum in the carburettor.
A
Assuming the same swept volume and no turbo charger, diesel engines compared to petrol engines: A. produce a lower maximum power output. B. show a higher fuel flow at the same power output. C. produce a higher maximum power output. D. operate at higher exhaust gas temperatures.
A
Both gas turbine and piston engines use a cycle made up of induction, compression, combustion and exhaust phases. Which of these statements about a piston engine are correct? 1. The process in a piston engine is intermittent. 2. Theoretically the combustion occurs at constant volume. A. Both 1 and 2 are correct. B. 1 is incorrect, 2 is correct. C. 1 is correct, 2 is incorrect. D. Both 1 and 2 are incorrect.
A
How is a piston engine shut down after flight? A. Pulling the mixture lever to idle/cut off B. Moving the fuel tank selector to OFF C. Turning off one magneto and then the other D. Turning off both magnetos together
A
If manifold pressure increases slightly after application of carb heat: A. ice was forming the intake. B. the CHT is excessive. C. the cylinder walls are overheating. D. excessive heat is being applied.
A
Ignition occurs in each cylinder of a four stroke engine... (TDC = Top Dead Centre) A. before TDC at each second crankshaft revolution. B. before TDC at each crankshaft revolution. C. afterTDC at each crankshaft revolution. D. after TDC at each second crankshaft revolution.
A
In a normally aspirated piston engine, when altitude increases, the mixture must be adjusted because there is... A. a decrease in air density resulting in too rich a mixture. B. an increase of air density resulting in too rich a mixture. C. a decrease of air density resulting in too lean a mixture. D. an increase of air density resulting in too lean a mixture.
A
In an engine equipped with a float-type carburettor, the low temperature that causes carburettor ice is normally the result of: A. vaporisation of fuel and expansion of the air in the carburettor B. low volatility of aviation fuel C. freezing temperature of the air entering the carburettor D. compression of air at the carburettor venturi
A
On an aeroplane with a piston engine and a fixed pitch propeller the power output is monitored on the: A. RPM indicator. B. RPM and MAP indicator. C. Cylinder head temperature indicator. D. Fuel Flow indicator.
A
Spark plug fouling is more likely to happen if: A. the aircraft descends for a prolonged time at idle power. B. power is increased too abruptly. C. the aircraft cruises at low speed with the correct mixture. D. the engine runs at maximum continuous power for too long.
A
The application of carburettor heating reduces the: A. density of air entering the carburettor, thus enriching the mixture. B. volume of air entering the carburettor, thus leaning the mixture. C. volume of air entering the carburettor, thus enriching the mixture. D. density of air entering the carburettor, thus leaning the mixture.
A
The main reason for opening the cowl flaps is to control the: A. C.H.T. (cylinder head temperature) B. cabin temperature C. E.G.T (exhaust gas temperature) D. oil temperature
A
The power output of a diesel engine without a turbo charger is regulated by: A. fuel flow only . B. mixture. C. airflow only. D. fuel flow and airflow.
A
The purpose of the venturi in a carburettor is to: A. create the suction necessary to cause fuel to flow through the carburettor main jets. B. create a rise in pressure at the throat before the mixture enters the induction system. C. prevent enrichment of the mixture due to high air velocity through the carburettor. D. ensure complete atomisation of the fuel before entering the injection system.
A
The rapid magnetic field changes in the primary coil of the magneto of a piston engine are produced when the... A. contact breaker points open. B. rotor turns past the position of maximum flux in the armature. C. contact breaker points close. D. distributor arm aligns with one of the high voltage segments.
A
The thermal efficiency of a piston engine is about: A. 30% B. 70% C. 80% D. 50%
A
Variations in mixture ratios for carburettors are achieved by the adjustment of: A. fuel flow. B. air flow. C. fuel flow, air flow and temperature. D. fuel flow and air flow.
A
When applying carburettor heating: A. the mixture becomes richer. B. RPM increases immediately. C. no change occurs in the mixture. D. the mixture becomes leaner.
A
When excessively leaning the mixture of a piston engine for a better fuel economy, but still on the rich side of the peak EGT, which of the following engine parameters may exceed their normal operating range? A. Cylinder head and exhaust gas temperature. B. Manifold pressure. C. Oil temperature. D. Engine RPM.
A
With regard to a piston engine, the relationship between the compression ratio and the required fuel octane rating is: the... A. higher the compression ratio, the higher the octane rating required. B. higher the compression ratio, the lower the octane rating required. C. lower the compression ratio, the higher the octane rating required. D. required octane rating is independent of the compression ratio.
A
"Vapour lock" is the phenomenon by which: A. water vapour bubbles are formed in the intake fuel line following the condensation of water in fuel tanks that have not been recently drained. B. vapour bubbles block the fuel line. C. abrupt and abnormal enrichment of the mixture following an inappropriate use of carburettor heat. D. burned gas bubbles are formed and remain in the exhaust manifold following an overheat, thereby disturbing the exhaust.
B
A piston engine compression ratio is the ratio of the: A. clearance volume to the swept volume. B. total volume to the clearance volume. C. swept volume to the clearance volume. D. total volume to the swept volume.
B
A piston engine is experiencing 'detonation'. Is the combustion process: A. The same rate as normal ignition B. Faster than normal ignition C. Slower than normal ignition D. Slower than pre-ignition
B
A piston engine may use a fuel of a different grade than the recommended: A. never B. provided that the grade is higher C. provided that the grade is lower D. provided that it is an aeronautical petrol
B
A turbocharger in a reciprocating engine consists of a: A. compressor and turbine on individual shafts. B. compressor and turbine mounted on a common shaft. C. turbine driving a compressor via a reduction gear. D. compressor driving a turbine via a reduction gear.
B
An EGT (Exhaust Gas Temperature) indicator for a piston engine is used to... A. control the carburettor inlet airflow. B. assist the pilot to set the correct mixture. C. control the fuel temperature. D. control the cylinder head temperature.
B
Carb heat is not usually used on take-off or at climb power because of: A. the possibility of detonation and pre-ignition. B. the power loss and the possibility of detonation. C. the power loss and the inability of the engine to produce enough heat. D. the power loss and the possibility of pre-ignition.
B
For a given type of oil, the viscosity depends on the... A. outside pressure. B. oil temperature. C. oil pressure. D. quantity of oil.
B
For a piston engine, pre-ignition refers to the condition that may arise when... A. a rich mixture is ignited by the sparking plugs. B. the mixture is ignited by abnormal conditions within the cylinder before the spark occurs at the plug C. the sparking plug ignites the mixture too early. D. an uncontrolled flame front speed occurs.
B
For a piston engine, the chemically correct fuel/air ratio is: A. 1:12 B. 1:15 C. 1:9 D. 1:10
B
If detonation occurs in a normally aspirated piston engine during climb-out, the normal corrective action is to... A. increase the rate of climb. B. retard the throttle. C. partially close cowling flaps. D. lean the mixture.
B
If, when the magneto selector switch is set to the OFF position, a piston engine continues to run normally, the most probable cause is that: A. there is a carbon deposit on the spark plugs. B. the grounding wire of one of the magnetos is broken. C. there are local hot spots in the engine. D. a grounding wire of one of the magnetos is in contact with a metallic part of the engine.
B
In a single spool gas turbine engine, the compressor rpm is: A. independent of the turbine rpm. B. the same as the turbine rpm. C. less than the turbine rpm. D. greater than the turbine rpm.
B
The air in a piston engine turbocharger enters the centrifugal compressor at: A. a tangent to the rotor and leaves via the stator. B. the eye of the impeller and leaves it almost at a tangent to the periphery. C. the periphery and leaves via the eye of the impeller. D. the diffuser and is fed to the impeller at the optimum angle of attack.
B
The conditions most likely to produce the highest engine power are: A. warm and dry air at high pressure. B. cold and dry air at high pressure. C. warm air at low pressure with high relative humidity. D. cold air at high pressure with high relative humidity.
B
The cylinder head and oil temperatures of a piston engine may exceed their normal operating ranges if: A. a higher octane rating than specified for the engine is used. B. a lower octane rating than specified for the engine is used. C. the engine is operated at a too rich mixture. D. the engine is operated at a higher than normal oil pressure.
B
The ignition system of a running piston engine receives electrical energy from: A. batteries. B. rotating permanent magnets. C. generators. D. capacitors.
B
The kind of compressor normally used in a piston engine as a turbocharger is... A. an axial compressor. B. a centrifugal compressor. C. a hybrid compressor. D. a piston compressor.
B
The octane rating of a fuel indicates its... A. electrical conductivity. B. resistance to detonation. C. capability for pre-ignition. D. volatility.
B
The part of a piston engine that transforms reciprocating movement into rotary motion is called the: A. piston B. crankshaft C. reduction gear D. camshaft
B
The thermal efficiency of a diesel engine is higher than that of a petrol engine because: A. the calorific value of the fuel is higher. B. the compression ratio is much higher. C. the EGT is higher. D. the air mass flow through the engine is higher.
B
Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine? A. The use of a fuel with a high octane rating as compared to the use of one with a low octane rating. B. High cylinder head temperature. C. Slightly retarding the ignition timing. D. Using an engine with a low compression ratio.
B
Which option is a desired characteristic for piston-engine fuel? A. High viscosity. B. Good anti-knock properties. C. Specific gravity greater than 1.0 kg/l. D. High flash point.
B
With regard to a piston engine, the sections of the carburettor where icing would most likely occur are the... A. float chamber and fuel inlet filter. B. venturi and the throttle valve. C. main air bleed and main discharge nozzle. D. accelerator pump and main metering jet.
B
A mixture setting richer than best power has to be used during climb segments. This results in a A. increase of power. B. higher torque. C. lower cylinder head temperature. D. higher efficiency.
C
A piston engine's compression ratio is the ratio of... A. the fuel to air mixture in the combustion chamber. B. degrees of crankshaft rotation of compression stroke to power stroke. C. the cylinder volume with the piston at bottom dead centre to the cylinder volume at top dead centre. D. piston travel during the compression stroke to travel during the intake stroke.
C
A stage in an axial compressor... A. consists of a ring of stator blades followed by a rotor disc. B. has a compression ratio in the order of 0.8:1 . C. consists of a rotor disc followed by a ring of stator blades. D. has a compression ratio in the order of 2.1:1 .
C
A turbocharger system in a reciprocating engine is normally driven by... A. an electrically-activated hydraulically-powered clutch. B. an hydraulic motor. C. the exhaust system. D. an electric motor.
C
An excessively rich mixture in a piston engine can be detected by: A. a long purple flame from the intake. B. a high cylinder head temperature. C. black smoke from the exhaust. D. white smoke from the exhaust.
C
Compared to the theoretical cycle of a four-stroke piston engine, the valve and ignition settings of the practical cycle are readjusted in order to increase the: A. compression ratio. B. piston displacement. C. overall efficiency. D. engine RPM.
C
Consider a piston-engined aircraft. For what reason is a separate engine-driven fuel pump always required? A. For operating in sub-zero temperatures, to prevent fuel waxing. B. When there is a fuel filter located between the fuel tank and the engine. C. To supply positive fuel pressure to a fuel injection system D. To facilitate fuel flow when the fuel tank is located above the engine.
C
Consider a reciprocating engine with a practical four-stroke cycle. During the compression stroke the valve positions are: A. both valves closed. B. exhaust valve open for the first part of the stroke, then closed. C. inlet valve open during the first part of the stroke, then closed. D. exhaust valve open.
C
Excessive pressure in the cylinders of a piston engine equipped with a constant speed propeller, can be caused by the combination of: A. low manifold pressure and high RPM. B. low manifold pressure and low RPM. C. high manifold pressure and low RPM. D. high manifold pressure and high RPM.
C
For a piston engine, specific fuel consumption is defined as the... A. maximum fuel consumption of the aircraft. B. quantity of fuel required to run the engine for one minute at maximum operating conditions. C. mass of fuel required to produce unit power for unit time. D. designed fuel consumption for a given RPM.
C
For piston engines, mixture ratio is the ratio between the: A. mass of fuel and volume of air entering the carburettor. B. volume of fuel and volume of air entering the cylinder. C. mass of fuel and mass of air entering the cylinder. D. volume of fuel and volume of air entering the carburettor.
C
In a piston engine if the ratio of air to fuel is approximately 9:1 the mixture is: A. chemically correct. B. too weak to support combustion. C. rich. D. weak.
C
In a reciprocating engine, the function of the primer pump is to... A. serve as an alternate pump in case of engine driven pump failure. B. inject additional fuel during engine acceleration. C. provide additional fuel for engine start. D. serve as main supply pump in a fuel injection system.
C
Maximum exhaust gas temperature (EGT) of a piston engine is theoretically associated with a... A. full rich setting. B. cruising mixture setting. C. fuel mass to air ratio of 1:15. D. mixture ratio very close to idle cut-out.
C
On a normally aspirated aero-engine fitted with a fixed pitch propeller: A. in level flight, manifold pressure will remain constant when the rpm is increased by opening the throttle. B. the propeller setting is constant at all indicated airspeeds. C. manifold pressure decreases as the aeroplane climbs at a fixed throttle setting. D. in a descent at a fixed throttle setting manifold pressure will always remain constant.
C
The formula to calculate the total displacement of a multi-cylinder piston engine is... A. cylinder volume x number of cylinders. B. cylinder length x cylinder diameter. C. piston area x piston stroke x number of cylinders. D. piston area x piston stroke.
C
The main purpose of a turbocharger is to... A. reduce the fuel flow. B. increase thermal efficiency. C. maintain power with increasing altitude. D. provide a richer mixture at higher altitudes.
C
The power of a normally aspirated piston engine decreases during a climb with a constant power lever setting because of the... A. increasing engine temperature. B. increasing air density. C. decreasing air density. D. decreasing outside air temperature.
C
The power of a piston engine measured by a friction brake is... A. heat loss power. B. frictional horse power. C. brake horse power. D. indicated horse power.
C
The purpose of a distributor in an ignition system of a piston engine is to distribute: A. secondary current to the capacitor. B. primary current to the capacitor. C. secondary current to the sparking plugs. D. primary current to the sparking plugs.
C
The reading on the engine oil pressure gauge is the... A. pressure of the oil upstream of the pressure pump. B. pressure in the oil tank. C. pressure of the oil downstream of the pressure pump. D. difference between the pressure pump pressure and the scavenge pump pressure.
C
The use of too low an octane fuel may cause: A. higher manifold pressure. B. a cooling effect on cylinders. C. detonation. D. vapour locking.
C
The working cycle of a four-stroke engine is: A. compression induction, power, exhaust. B. induction, compression, expansion, power. C. induction, compression, power, exhaust. D. induction, power, compression, exhaust.
C
When detonation is recognised in a piston engine, the correct procedure is to: A. increase manifold pressure and lean the mixture. B. increase manifold pressure and fully enrich the mixture. C. reduce manifold pressure and fully enrich the mixture. D. reduce manifold pressure and lean the mixture.
C
With respect to a piston engine aircraft, ice in the carburettor: A. will only form at outside air temperatures OAT`s below the freezing point of water. B. will only form at OAT`s below the freezing point of fuel. C. may form at OAT`s higher than +10°C. D. will only form at OAT`s below +10°C.
C
A piston engine aeroplane with a fixed pitch propeller is flying at normal cruising speed when one magneto fails completely. The initial response of the engine is... A. excessive vibration. B. an additional load on the other magneto. C. a significant increase in cylinder head temperature. D. a loss of approximately 100 RPM.
D
After air has passed through the compressor of a gas turbine engine the: A. velocity will be higher than the inlet velocity. B. velocity will be the same as the inlet velocity. C. pressure will be the same as the inlet pressure. D. temperature will be higher than the inlet temperature.
D
Aircraft fuel tanks should be checked for water: A. before each flight. B. immediately after every refuelling. C. during refuelling. D. before the first flight of the day.
D
Apart from flight into known icing conditions, the intake system of a diesel engine: A. needs to be heated at low power settings, due to vaporisation heat. B. is never heated because diesel engines operate at very high temperatures. C. needs to be heated to prevent ice on the air filter. D. is never heated because a diesel engine is a injection engine.
D
As altitude increases, the mixture ratio of a piston engine should be adjusted to... A. reduce the fuel flow in order to compensate for the increasing air density. B. increase the fuel flow in order to compensate for the decreasing air pressure and density. C. increase the fuel flow in order to compensate for the decreasing air pressure and increasing temperature. D. reduce the fuel flow in order to compensate for the decreasing air density.
D
Comparing a fuel injection system to a fuel carburettor system for a piston engine, the fuel injection system: A. has a decreased acceleration response. B. increases the chances of cylinders overheating due to uneven fuel distribution. C. has a worsened fuel economy. D. is less prone to induction system icing.
D
Dual ignition for a piston engine provides a factor of reliability and: A. provides more voltage. B. improves starting. C. saves wear caused by using one magneto constantly. D. improves combustion efficiency.
D
For a piston engine, in order to get optimum efficiency, the positions of the inlet and exhaust valves just after the power stroke are... A. both valves closed. B. exhaust valve closed and inlet valve open. C. both valves open. D. inlet valve closed and exhaust valve open.
D
If the ground wire between the magnetos and the ignition switch of a piston engine becomes disconnected the most noticeable result will be that: A. the engine cannot be started with the ignition switch in the "ON" position. B. the power developed by the engine will be greatly reduced. C. a still operating engine will run down. D. the engine cannot be shut down by turning the ignition switch to the "OFF" position.
D
In a piston engine, the purpose of an altitude mixture control is to... A. weaken the mixture because of reduced exhaust back pressure at altitude. B. enrich the mixture due to decreased air density at altitude. C. prevent a weak mixture when the throttle is opened rapidly at altitude. D. correct for variations in the fuel/air ratio due to decreased air density at altitude.
D
In a single stage of a gas turbine axial compressor the sequence of blades is... A. stator - rotor. B. stator - stator - rotor. C. rotor - rotor - stator. D. rotor - stator.
D
In a theoretical four-stroke cycle, during the compression stroke: A. Inlet valve is open, exhaust valve is closed B. Inlet and exhaust valves are both open C. Inlet valve is closed, exhaust valve is open D. Inlet and exhaust valves are both closed
D
On a normally aspirated piston engine, the manifold pressure gauge always indicates: A. zero on the ground when the engine is stopped. B. a value equal to the atmospheric pressure when the engine is at full power on the ground. C. a greater value than atmospheric pressure when the engine is running. D. a lower value than atmospheric pressure when the engine is running.
D
One stage of an axial compressor in a gas turbine engine comprises: A. inlet guide vanes followed by a row of rotor blades and a row of stator vanes. B. a row of inlet guide vanes followed by a row of rotor blades. C. a row of rotor blades followed by a row of inlet guide vanes. D. a row of rotor blades followed by a row of stator vanes.
D
Prolonged running of a piston engine at low rpm can have an adverse effect on the functioning of the: A. carburettor. B. oil pump. C. fuel filter. D. spark plugs.
D
The compressor blades in a rotating gas turbine engine are held in position by... A. abradable seals and aerodynamic forces. B. a centrifugal latch. C. the mountings and thermal expansion only. D. the mountings, the aerodynamic force, and centrifugal force.
D
The crank assembly of a piston engine comprises the: A. crankshaft, camshaft, valves, valve springs and push rods. B. propeller, crankshaft, pistons and connecting rods. C. crankcase, crankshaft, connecting rods and pistons. D. crankshaft, connecting rods and pistons.
D
The diffuser in a centrifugal compressor is a device in which the: A. velocity, pressure and temperature rise. B. pressure rises at a constant velocity. C. velocity rises and pressure falls. D. pressure rises and velocity falls.
D
The fan stage of a ducted-fan turbine engine is driven by the... A. high-pressure compressor through reduction gearing. B. high-pressure turbine. C. high-pressure compressor. D. low-pressure turbine.
D
The first indication of carburettor icing on an aeroplane with a piston engine and a constant speed propeller during cruise is: A. abnormal cylinder head temperature B. decrease in RPM. C. increase in manifold pressure. D. loss of manifold pressure.
D
The mixture controller of a carburettor: A. moves the butterfly valve through a separate linkage to the main throttle control. B. varies the air supply at the main discharge nozzle. C. alters the pressure drop at the main discharge nozzle. D. varies the fuel supply to the main discharge nozzle.
D
The operating principle of float-type carburettors is based on the: A. automatic metering of air at the venturi as the aircraft gains altitude B. measurement of the fuel flow into the induction system C. increase in air velocity in the throat of a venturi causing an increase in air pressure D. difference in air pressure at the venturi throat and the air inlet
D
The operating principle of magnetos in a piston engine ignition system consists of: A. creating a brief high intensity magnetic field that will be sent through the distributor at the appropriate time. B. obtaining a high amperage, low voltage current in order to generate the spark. B. accumulating in a capacitor a low voltage current from the battery and inducing it as a high voltage current at the moment the spark is generated. D. opening the primary circuit in order to induce a low amperage, high voltage current, which is distributed to the spark plugs.
D
The power output of a piston engine is directly proportional to: A. work and velocity. B. force and distance. C. exhaust back pressure and RPM. D. torque and RPM.
D
Under normal running conditions of a piston engine a magneto draws primary current: A. from the booster coil. B. directly from the aircraft batteries. C. from the aircraft batteries via an inverter. D. from a self-contained electro-magnetic induction system.
D
What may happen to a piston engine during a continuous climb with a mixture setting fully rich? A. The engine will overheat. B. The engine will operate more smoothly but fuel consumption will increase. C. Increase of the power available. D. Fouling of spark-plugs.
D
When comparing petrol engines with diesel engines, petrol engines A. Have an injection system; diesel engines have a carburettor B. Have an injection system C. Have a lower specific fuel consumption than diesel engines. D. Have a lower compression ratio than diesel engines.
D
When the pilot moves the mixture lever of a piston engine towards a leaner position the: A. volume of air entering the carburettor is increased. B. volume of air entering the carburettor is reduced. C. amount of fuel entering the cylinders is increased. D. amount of fuel entering the cylinders is reduced.
D
Which of the following could indicate an oil leak in a piston engine? A. Rising oil temperature and rising oil pressure. B. Falling oil temperature, rising oil pressure. C. Falling oil temperature and falling or fluctuating oil pressure. D. Rising oil temperature, falling or fluctuating oil pressure.
D
With regard to piston engines, once the engine has started, the ignition system is... A. dependent on the battery. B. dependent on the AC generator. C. dependent on the DC generator. D. independent of the aircraft`s electrical system.
D
