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CPL Test Series
Question Bank
Questions for INDIGO PISTON (836-954)
Answer the following questions
Test Mode
Training Mode
1.
The power output of a normally aspirated piston engine increases with increasing altitude at constant Manifold Air Pressure (MAP) and RPM because of the
leaner mixture at higher altitudes
lower friction losses
lower back pressure
lower losses during the gas change
2.
Spark plug fouling is more likely to happen if
the aircraft climbs without mixture adjustment.
power is increased too abruptly
the engine runs at the authorized maximum continuous power for too long
the aircraft descends without a mixture adjustment.
3.
Vapour lock is
the inability of a fuel to vaporize in the carburettor
the formation of water vapour in a fuel system
vaporizing of fuel in the carburettor
vaporizing of fuel prior to reaching the carburettor
4.
The purpose of an ignition switch is to
connect the secondary coil to the distributor
control the primary circuit of the magneto
connect the battery to the magneto
connect the contact breaker and condenser in series with the primary coil
5.
An aircraft magneto is switched off by
opening the secondary circuit
opening the primary circuit
grounding the secondary circuit.
grounding the primary circuit
6.
The kind of compressor normally used as a supercharger is
an axial compressor.
a hybrid compressor.
a radial compressor
a piston compressor
7.
An impulse coupling used on a magneto for a piston engine is for
providing a retarded spark for engine starting
advancing ignition timing
quick removal and installation
absorbing starting loads
8.
n a piston engine, turbocharger boost pressure may be monitored by
a manifold pressure gauge only
a cylinder head temperature gauge (CHT), a manifold pressure gauge, and engine rpm readings.
both engine rpm readings and a manifold pressure gauge
both a CHT gauge and manifold pressure gauge
9.
Ignition systems of piston engines are
dependant on the DC-Generator
dependant on the battery.
dependant on the AC-Generator.
independant from the electrical system of the aircraft.
10.
An excessively rich mixture can be detected by
a long purple flame from exhaust.
high cylinder head temperatures
white smoke from exhaust.
black smoke from exhaust.
11.
A piston engine compression ratio is the ratio of the
total volume to the clearance volume.
swept volume to the clearance volume
clearance volume to the swept volume
total volume to the swept volume
12.
""Vapor lock"" is the phenomenon by which
burnt gas plugs forming and remaining in the exhaust manifold following an overheat and thereby disturbing the exhaust.
abrupt and abnormal enrichment of the fuel/air mixture following an inappropriate use of carburettor heat.
water vapour plugs are formed in the intake fuel line following the condensation of water in fuel tanks which have not been drained for sometime
heat produces vapour plugs in the fuel line.
13.
Fixed-pitch propellers are usually designed for maximum efficiency at
idling
take-off
full throttle
cruising speed
14.
The octane rating of a fuel characterises the
fuel volatility
the anti-knock capability
quantity of heat generated by its combustion
fuel electrical conductivity
15.
The part of a piston engine that transforms reciprocating movement into rotary motion is termed the
camshaft
reduction gear
crankshaft
piston
16.
The purpose of the venturi in a carburettor is to
create the depression necessary to cause fuel to flow through the carburettor jets.
prevent enrichment of the mixture due to high air velocity through the carburettor
create a rise in pressure at the throat before the mixture enters the induction system
ensure complete atomisation of the fuel before entering the induction system.
17.
The conditions which can cause knocking are
Low manifold pressure and high fuel flow.
High manifold pressure and high revolutions per minute
High manifold pressure and low revolutions per minute.
Low manifold pressure and high revolutions per minute.
18.
To ensure that the fuel flow is kept directly proportional to the volume of air flowing through the choke, thus preventing the main jet supplying excessive fuel as engine speed is increased, a carburettor is fitted with
a power jet
an accelerator pump
a diffuser
a mixture control
19.
(For this question use appendix )On the attached diagram showing the power output of a piston engine as a function of mixture richness, best economy is at the point marked
2
1
4
3
20.
The primary purpose of a supercharger is to
increase quantity of fuel at metering jet
provide a richer mixture at high altitudes
provide leaner mixtures at altitudes below 5000 ft
maintain power at altitude
21.
The air in a piston engine turbo-supercharger centrifugal compressor
enters at the periphery and leaves via the eye of the impeller
enters via the diffuser and is fed to the impeller at the optimum angle of attack
enters the eye of the impeller and leaves at a tangent to the periphery.
enters at a tangent to the rotor and leaves via the stator
22.
When applying carburettor heating
decrease in RPM results from the lean mixture
no change occurs in the mixture ratio.
the mixture becomes richer.
the mixture becomes leaner.
23.
Max. Exhaust Gas Temperature is theoretically associated with
Cruising mixture setting.
Mass ratio of 1/15.
Mixture ratio very close to idle cut-out
Full rich setting.
24.
The 'slipstream effect' of a propeller is most prominent at
low airspeeds with high power setting.
low airspeeds with low power setting.
high airspeeds with high power setting
high airspeeds with low power setting.
25.
The useful work area in an ideal Otto engine indicator diagram is enclosed by the following gas state change lines
2 adiabatic and 2 isobaric lines
2 adiabatic and 1 isothermic lines
2 adiabatic and 2 isochoric lines.
2 adiabatic, 1 isochoric and 1 isobaric lines.
26.
The 'constant speed propeller' has
its best efficiency during climb.
only at the design speed a better efficiency than the fixed propeller
in general a worse efficiency than the fixed propeller
only above and below the design point a better efficiency than the fixed propeller with the same design speed.
27.
Low oil pressure is sometimes the result of a
too large oil pump
too small scavenger pump.
restricted oil passage
worn oil pump
28.
What can be the consequence during a descent with a fully open throttle if the waste gate is seized ?
The turbine shaft will break.
The power of the motor will decrease
The turbine blades will separate.
The manifold air pressure (MAP) value may exceed the maximum allowed value.
29.
Consider the variable-pitch propeller of a turbo-prop.During deceleration
with propeller windmilling, the thrust is zero and the propeller supplies engine power
at zero power, the propeller thrust is zero and the engine power absorbed is nil
when feathered, the propeller produces thrust and absorbs no engine power.
when braking, the propeller supplies negative thrust and absorbs engine power.
30.
In case of engine failure during flight the blades of the constant speed propeller in a single engine aeroplane, not fitted with feathering system
move in the lowest pitch position by the centrifugal force.
move in a certain pitch position depending on windmilling RPM.
move in low pitch position by oil pressure created by the windmilling propeller.
move in the highest pitch position by the aerodynamical force.
31.
For internal cooling,reciprocating engines are especially dependent on
a properly functioning thermostat
the circulation of lubricating oil
a lean fuel/air mixture
a rich fuel/air mixture
32.
The positions of the intake and exhaust valve at the end of the power stroke are
both valves closed.
intake valve closed and exhaust valve open.
exhaust valve closed and intake valve open.
both valves open.
33.
When the pilot moves the mixture lever of a piston engine towards a lean position the
volume of air entering the carburettor is increased
amount of fuel entering the combustion chamber is increased
amount of fuel entering the combustion chamber is reduced.
volume of air entering the carburettor is reduced.
34.
For a piston engine, the ideal fuel/air mixture corresponding to a richness of 1 is obtained for a weight ratio of
1/9 th
1/15 th
1/10th
1/12th
35.
The maximum horsepower output which can be obtained from an engine when it is operated at specified rpm and manifold pressure conditons established as safe for continuous operation is termed
critical power
take-off power.
maximum power
rated power
36.
Prolonged running at low rpm may have an adverse effect on the efficiency of the
oil pump
sparking plugs
fuel filter.
carburettor.
37.
Which of the following factors would be likely to increase the possibility of detonation occurring within a piston engine ?
using too lean a fuel/air mixture ratio
slightly retarding the ignition timing
the use of a fuel with a high octane rating as compared to the use of one with a low octane rating
using an engine with a low compression ratio
38.
A piston engine may use a fuel of a different grade than the recommended
provided that the grade is lower
provided that it is an aeronautical petrol
provided that the grade is higher
never
39.
On four-stroke piston engines, the theoretical valve and ignition settings are readjusted in order to increase the
piston displacement
compression ratio
overall efficiency
engine r.p.m.
40.
The working cycle of a four-stroke engine is
compression induction, power, exhaust.
induction, compression, power, exhaust.
induction, compression, expansion, power
induction, power, compression, exhaust.
41.
In most cases aeroplane piston engines are short stroke engines. This permits a
better piston cooling
lighter construction.
cheaper construction
lower fuel consumption
42.
The crank assembly consists of
Crankcase, crankshaft, connecting rods and pistons
propeller, crankshaft, pistons and connecting rods
crankshaft, connecting rods and pistons
crankshaft, camshaft, valves, valve springs and push rods
43.
In which sections of the carburettor would icing most likely occur?
accelerator pump and main metering jet
venturi and the throttle valve
main air bleed and main discharge nozzle
float chamber and fuel inlet filter
44.
On a a normally aspirated engine (non turbo-charged), the manifold pressure gauge always indicates
a value equal to the QFE when the engine is at full power on the ground.
zero on the ground when the engine is stopped.
a lower value than atmospheric pressure when the engine is running
a greater value than atmospheric pressure when the engine is running
45.
Spark timing is related to engine speed in the way that the
faster the engine functions, the more the spark is advanced
faster the engine functions, the further past TDC the spark occurs
faster the engine functions, the more retarded the spark is.
slower the engine functions, the more the spark is advanced
46.
If the ground wire between the magneto and the ignition switch becomes disconnected, the most noticeable result will be that the engine
cannot be started with the switch in the ON position
will not operate at the right magneto
will not operate at the left magneto
cannot be shut down by turning the switch to the OFF position
47.
When TAS increases, the pitch angle of a constant speed propeller (RPM and MAP levers are not moved)
stays constant
first reduces and after a short time increases to its previous value.
reduces.
increases.
48.
2 adiabatic, 1 isochoric and 1 isobaric lines
piston area * piston stroke
cylinder length * cylinder diameter
piston area * piston stroke * number of cylinders
cylinder volume * number of cylinders
49.
The octane rating of a fuel and compression ratio of a piston engine have which of the following relations?
the lower the octane rating is, the higher the possible compression ratio is
the higher the octane rating is, the higher the possible compression ratio is
compression ratio is independent of the octane rating.
the higher the octane rating is, the lower the possible compression ratio is.
50.
To adjust the mixture ratio of a piston engine when altitude increases, means to
decrease the amount of fuel in the mixture in order to compensate for the increasing air density.
decrease the fuel flow in order to compensate for the decreasing air density.
increase the amount of fuel in the mixture to compensate for the decreasing air pressure and density.
increase the mixture ratio.
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