A&P - Powerplant Oral (Jeppesen)
A bloodless cylinder is located when troubleshooting a going for walks engine. What does
this indicate? - ANS-No combustion in that cylinder.
A reciprocating engine is determined to have immoderate oil intake without proof of any oil
leaks. What is the probable cause? - ANS-The piston jewelry are worn or damaged.
A susceptible cylinder is found throughout a compression test. What need to be inspected? -
ANS-The internal of the cylinder.
Are the connecting rods used in each cylinder of a radial engine the same? Explain. -
ANS-No. Radial engines use master and articulating rod assemblies.
At what velocity does a gasoline turbine APU perform and how is this speed maintained? -
ANS-At or near its rated speed regardless of electrical or pneumatic masses imposed. The
APU gasoline manipulate mechanically adjusts the gasoline go with the flow to preserve the
rated pace.
Between subject and armature windings in starter-generators, which usually acquire
contemporary for operation within the begin mode? - ANS-Generally, both field and armature
acquire cutting-edge for operation within the start mode.
Can the EGT gadget on a turbine engine be checked with out running the engine? -
ANS-Yes, with the aid of checking the resistance of the thermocouples and circuits.
Describe how a Kidde and Fenwal continuous loop fire protection device capabilities. -
ANS-A Kidde machine has a sensing detail including a sealed Inconel tube containing two
conductors that are embedded in a thermistor fabric. One twine is electrically grounded to
the outer tube at each stop and acts as an inner floor, and the other is a advantageous lead.
When a fireplace or overheat occurs, the resistance of the thermistor fabric drops, allowing
current to glide between the two wires to set off an alarm. A Fenwal machine makes use of a
sensing element such as a small diameter bendy Inconel tube containing a unmarried twine
electrode surrounded via ceramic beads. These ceramic beads prevent the electrode and
tube from touching each different. Current is applied to the electrode at the same time as the
outer tube is grounded to the plane shape. When a fire or overheat happens, the center
resistance of the ceramic beads drops, allowing present day to go with the flow among the
middle electrode and ground, energizing the alarm system.
During engine operation, wherein have to the propeller manipulate be set when checking the
manifold stress? - ANS-Low pitch, high r.P.M.
,Explain the principle distinction and advantage a turbofan over turbojet engines. - ANS-A
turbofan engine uses a fan to bypass some air around the engine middle and to offer thrust.
The benefit is that this affords additional thrust without increasing fuel drift.
How and at what factor does an internally driven supercharger increase air strain? - ANS-An
(engine-driven) impeller compresses the fuel/air aggregate after it leaves the carburetor.
How are fire extinguishing marketers allotted? - ANS-Through perforated tubing and/or
discharge nozzles.
How are gasoline turbine engine tachometers calibrated? - ANS-They are calibrated in
percent rpm.
How are a few timber propeller blades blanketed from put on and damage? - ANS-By metal
tipping fastened to the leading edge and tip.
How are turbine engines cooled? - ANS-They are cooled with the aid of air passing thru the
engine. About seventy five% of the air passing via the engine is used for cooling which
leaves most effective about 25% for combustion. This air is used to chill the combustion
chamber and turbine.
How are twine sizes represented? - ANS-By a numbered gauge size. The smaller wires are
represented via larger numbers. The smallest size wire generally utilized in aircraft is
22-gauge.
How are wood propellers commonly wiped clean? - ANS-With a brush or material and heat
water with slight cleaning soap.
How can a free stud in an engine crankcase be repaired? - ANS-Remove the unfastened
stud and look into the hole for size and thread circumstance. It may be vital to apply an
oversize stud or Heli-Coil.
How can repair document marks be eliminated from an aluminum propeller? - ANS-With
very best sandpaper.
How can the final provider life of starter-generator brushes be determined? - ANS-By visually
inspecting the amount of wear groove last at the brushes.
How are you able to tell if a turbofan or turbojet engine is out of trim? - ANS-There might be
a excessive exhaust gas temperature at the goal engine strain ratio for takeoff power.
How do venturi-type particle separators, observed on many turbine powered helicopters,
function? - ANS-A venturi is used to accelerate the float of incoming air and particles via a
curved consumption. The particles gains an excessive amount of inertia to permit it to follow
the curved consumption in the direction of the engine, and is channeled faraway from the
compressor.
How do you pick out the engine serial wide variety? - ANS-It is on the engine records plate.
, How do you check out the inner baffles and diffusers of an exhaust device? - ANS-By
disassembling the exhaust machine as essential and visually examining the additives.
How does a magneto produce the high voltage required to fire a spark plug? - ANS-In the
rotation cycle, while the magnetic rotor is inside the E-hole function, the primary factors
open, which interrupts the present day flow within the number one circuit causing a
excessive price of flux trade in the middle, and inducing a pulse of high voltage within the
secondary coil.
How does a noise suppressor discovered on older turbojet engines paintings? - ANS-It
converts low frequency sound, which is audible over notable distance, into excessive
frequency sound, hence reducing the sound footprint.
How does a thermal transfer hearth protection gadget operate? - ANS-When heated past a
predetermined temperature, the transfer closes causing the warning gadgets within the
cockpit to prompt.
How does an augmenter cooling system work? - ANS-An outer tube located over the exiting
exhaust gasoline creates a venturi impact that attracts greater airflow over the engine,
accordingly supplying extra cooling.
How does an automatic combination control (AMC) function? - ANS-A sealed brass bellows
connected to the gas metering system, expands and contracts with changes in pressure and
temperature, adjusting the combination for that reason.
How does induction icing affect engine performance? - ANS-It reasons a reduction in power
and possible erratic operation.
How does relative humidity affect turbine engines? - ANS-Negligible impact.
How does the voltage regulator control the voltage of an alternator? - ANS-By regulating the
voltage output of the DC exciter.
How is a regular speed feathering propeller feathered? - ANS-Be releasing oil stress in the
governor, the counterweights and feathering spring flow the propeller into feather. This
happens mechanically if the governor oil stress drops to 0 (following an engine failure in
most turboprops), or may be manually controlled through the pilot with the aid of transferring
the propeller manage into the feathering detent.
How is a fire extinguisher system with a excessive price of discharge classified? - ANS-As
an HRD hearth extinguisher system.
How is an APU normally started out? - ANS-With its own electrical starter and battery power.
How is an APU close down and why is this technique used? - ANS-After the APU is
unloaded by way of final the bleed air valve, it's far run for a targeted quantity of time to
permit the EGT to chill and stabilize. This settle down period is usually 3 mins. If a closely
A bloodless cylinder is located when troubleshooting a going for walks engine. What does
this indicate? - ANS-No combustion in that cylinder.
A reciprocating engine is determined to have immoderate oil intake without proof of any oil
leaks. What is the probable cause? - ANS-The piston jewelry are worn or damaged.
A susceptible cylinder is found throughout a compression test. What need to be inspected? -
ANS-The internal of the cylinder.
Are the connecting rods used in each cylinder of a radial engine the same? Explain. -
ANS-No. Radial engines use master and articulating rod assemblies.
At what velocity does a gasoline turbine APU perform and how is this speed maintained? -
ANS-At or near its rated speed regardless of electrical or pneumatic masses imposed. The
APU gasoline manipulate mechanically adjusts the gasoline go with the flow to preserve the
rated pace.
Between subject and armature windings in starter-generators, which usually acquire
contemporary for operation within the begin mode? - ANS-Generally, both field and armature
acquire cutting-edge for operation within the start mode.
Can the EGT gadget on a turbine engine be checked with out running the engine? -
ANS-Yes, with the aid of checking the resistance of the thermocouples and circuits.
Describe how a Kidde and Fenwal continuous loop fire protection device capabilities. -
ANS-A Kidde machine has a sensing detail including a sealed Inconel tube containing two
conductors that are embedded in a thermistor fabric. One twine is electrically grounded to
the outer tube at each stop and acts as an inner floor, and the other is a advantageous lead.
When a fireplace or overheat occurs, the resistance of the thermistor fabric drops, allowing
current to glide between the two wires to set off an alarm. A Fenwal machine makes use of a
sensing element such as a small diameter bendy Inconel tube containing a unmarried twine
electrode surrounded via ceramic beads. These ceramic beads prevent the electrode and
tube from touching each different. Current is applied to the electrode at the same time as the
outer tube is grounded to the plane shape. When a fire or overheat happens, the center
resistance of the ceramic beads drops, allowing present day to go with the flow among the
middle electrode and ground, energizing the alarm system.
During engine operation, wherein have to the propeller manipulate be set when checking the
manifold stress? - ANS-Low pitch, high r.P.M.
,Explain the principle distinction and advantage a turbofan over turbojet engines. - ANS-A
turbofan engine uses a fan to bypass some air around the engine middle and to offer thrust.
The benefit is that this affords additional thrust without increasing fuel drift.
How and at what factor does an internally driven supercharger increase air strain? - ANS-An
(engine-driven) impeller compresses the fuel/air aggregate after it leaves the carburetor.
How are fire extinguishing marketers allotted? - ANS-Through perforated tubing and/or
discharge nozzles.
How are gasoline turbine engine tachometers calibrated? - ANS-They are calibrated in
percent rpm.
How are a few timber propeller blades blanketed from put on and damage? - ANS-By metal
tipping fastened to the leading edge and tip.
How are turbine engines cooled? - ANS-They are cooled with the aid of air passing thru the
engine. About seventy five% of the air passing via the engine is used for cooling which
leaves most effective about 25% for combustion. This air is used to chill the combustion
chamber and turbine.
How are twine sizes represented? - ANS-By a numbered gauge size. The smaller wires are
represented via larger numbers. The smallest size wire generally utilized in aircraft is
22-gauge.
How are wood propellers commonly wiped clean? - ANS-With a brush or material and heat
water with slight cleaning soap.
How can a free stud in an engine crankcase be repaired? - ANS-Remove the unfastened
stud and look into the hole for size and thread circumstance. It may be vital to apply an
oversize stud or Heli-Coil.
How can repair document marks be eliminated from an aluminum propeller? - ANS-With
very best sandpaper.
How can the final provider life of starter-generator brushes be determined? - ANS-By visually
inspecting the amount of wear groove last at the brushes.
How are you able to tell if a turbofan or turbojet engine is out of trim? - ANS-There might be
a excessive exhaust gas temperature at the goal engine strain ratio for takeoff power.
How do venturi-type particle separators, observed on many turbine powered helicopters,
function? - ANS-A venturi is used to accelerate the float of incoming air and particles via a
curved consumption. The particles gains an excessive amount of inertia to permit it to follow
the curved consumption in the direction of the engine, and is channeled faraway from the
compressor.
How do you pick out the engine serial wide variety? - ANS-It is on the engine records plate.
, How do you check out the inner baffles and diffusers of an exhaust device? - ANS-By
disassembling the exhaust machine as essential and visually examining the additives.
How does a magneto produce the high voltage required to fire a spark plug? - ANS-In the
rotation cycle, while the magnetic rotor is inside the E-hole function, the primary factors
open, which interrupts the present day flow within the number one circuit causing a
excessive price of flux trade in the middle, and inducing a pulse of high voltage within the
secondary coil.
How does a noise suppressor discovered on older turbojet engines paintings? - ANS-It
converts low frequency sound, which is audible over notable distance, into excessive
frequency sound, hence reducing the sound footprint.
How does a thermal transfer hearth protection gadget operate? - ANS-When heated past a
predetermined temperature, the transfer closes causing the warning gadgets within the
cockpit to prompt.
How does an augmenter cooling system work? - ANS-An outer tube located over the exiting
exhaust gasoline creates a venturi impact that attracts greater airflow over the engine,
accordingly supplying extra cooling.
How does an automatic combination control (AMC) function? - ANS-A sealed brass bellows
connected to the gas metering system, expands and contracts with changes in pressure and
temperature, adjusting the combination for that reason.
How does induction icing affect engine performance? - ANS-It reasons a reduction in power
and possible erratic operation.
How does relative humidity affect turbine engines? - ANS-Negligible impact.
How does the voltage regulator control the voltage of an alternator? - ANS-By regulating the
voltage output of the DC exciter.
How is a regular speed feathering propeller feathered? - ANS-Be releasing oil stress in the
governor, the counterweights and feathering spring flow the propeller into feather. This
happens mechanically if the governor oil stress drops to 0 (following an engine failure in
most turboprops), or may be manually controlled through the pilot with the aid of transferring
the propeller manage into the feathering detent.
How is a fire extinguisher system with a excessive price of discharge classified? - ANS-As
an HRD hearth extinguisher system.
How is an APU normally started out? - ANS-With its own electrical starter and battery power.
How is an APU close down and why is this technique used? - ANS-After the APU is
unloaded by way of final the bleed air valve, it's far run for a targeted quantity of time to
permit the EGT to chill and stabilize. This settle down period is usually 3 mins. If a closely
