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power plant 1 Flashcards

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1
Q

In a gas turbine engine, combustion occurs at a _______.

A

Pressure

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2
Q

At higher subsonic speed, the type of engine which affords the most efficient propulsive power is the _______.

A

turbofan

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3
Q

A typical cool-down period for an APU is _______.

A

3 Minutes

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4
Q

When a gas or fluid is supplied through a divergent duct, if pressure increases, _______.

A

Velocity will increase

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5
Q

Engine manufacturers’ calculations of static thrust are based on a temperature of _______.

A

15°C

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6
Q

What is meant by ‘shrouded turbine blades’?

A

The turbine wheel is enclosed in a protective shroud to contain the blades in case of failure

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7
Q

In a turbine engine, the highest pressure is found _______.

A

at the entrance of the turbine section

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8
Q

High EGT, high fuel flow and low RPM at all engine power settings is most likely caused by _______.

A

FCU out of adjustment

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9
Q

Compressor blades which have a reduced thickness at the tips are referred to as _______.

A

squeeler blades

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10
Q

The primary airflow through a combustor is approximately _______ of the total airflow.

A

75%

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11
Q

In a reverse flow annular combustor, the main airflow enters the combustor from _______.

A

the front of the engine

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12
Q

The most common method of attaching turbine blades to a turbine wheel is with _______.

A

the dove tail design

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13
Q

On turbine engines, the type of bearing better equipped to support radial loads rather than thrust loads is the _______.

A

roller bearing

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14
Q

If a minute crack is found on a turbine disk, it must be _______.

A

further inspected with dye penetrant

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15
Q

Turbine blade replacements are identified by code letters indicating the _______.

A

moment weight in inch-ounces

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16
Q

Variable inlet guide vanes are actuated by means of cylinders which receive operating pressure from _______.

A

the IGV controller

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17
Q

A permanent elongation which occurs on turbine blades due to centrifugal force is known as _______.

A

deformation

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18
Q

The type of fuel pump designed to deliver a continuous supply of high pressure fuel to the fuel control unit is the _______.

A

engine driven pump

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19
Q

The two types of turbine engine fuel nozzles generally used are _______.

A

flow divider and duplex

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20
Q

With no change in power setting parameters, high oil temperatures indicate _______.

A

engine main bearing distress

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21
Q

The type of oil system usually found on most turbojet engines is _______.

A

dry sump, pressure and spray

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22
Q

In a gas turbine engine, oil picks up most heat from the _______.

A

exhaust turbine bearing

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23
Q

What will happen to the return line if the oil line between the scavenge pump and the oil cooler separates? The oil will _______.

A

accumulate in the engine

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24
Q

The capacity of the oil scavenge system must be _______ the capacity of the pressure system.

A

at least double

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25
The normal starting sequence for a turbojet engine is _______.
starter, ignition, fuel
26
In-flight, turbine engine flameouts are usually caused by _______.
interruption of the inlet airflow
27
The two common classifications of capacitor ignition systems are _______.
low voltage and high voltage
28
On a turbine engine, a starter-generator requires a _______.
shunt motor for both starter and generator
29
The air source supplied to an air-turbine starter is _______.
high pressure, low volume
30
A carbon seal found on turbine engines normally rides on _______.
a highly polished surface
31
Temperature taken aft of the turbine wheel(s) is known as _______.
EGT
32
Which of the following are the most common types of thrust reversers used on turbine engine powered aircraft?
cascade vane and blocker door
33
Turbine engines utilize a capacitor-discharge ignition system that has a high voltage and _______.
very low amperage
34
Air enters the centrifugal flow compressor impeller at the _______.
center
35
Which of the following could cause flameout?
turbulence
36
Cracks in turbine blades are _______.
not acceptable
37
What is 'creep' in relation to a turbine blade?
tendency to elongate due rotation
38
What is considered a standard day?
temperature 59°F, pressure 29.92
39
Which of the following engine fire detection systems measures temperature rise compared to a reference temperature?
All of the above
40
An engine reduction gear is designed to _______.
provide an engine RPM lower than that of the propeller or transmission shaft
41
The brake horsepower (BHP) of an engine is _______.
the total power developed, disregarding friction losses
42
Manifold pressure is defined as _______.
the absolute pressure in the intake manifold
43
Which of the following results in a decrease in volumetric efficiency?
carburetor air temperature too low
44
Piston rings are usually made of _______.
gray cast iron
45
The reason why choke-type cylinders are used is to _______.
compensate for normal cylinder barrel wear
46
To allow surplus oil to return to the crankcase, holes are drilled in _______.
the oil scraper ring grooves
47
Excessive valve clearance will cause the duration of valve opening to _______.
increase for both intake and exhaust valves
48
Cam-ground pistons are installed in some aircraft engines to _______.
provide a better fit at operating temperatures
49
Knuckle pins form the hinge between _______.
the pistons and the connecting rods
50
At what speed range is a fixed pitch propeller designed to be most efficient?
cruise
51
What happens to the blade angle of a constant speed propeller in flight if the throttle is advanced?
it will be increased
52
What is the flat side of the propeller blade called?
the face
53
The thrust reverser accounts for how much percentage of braking?
30%
54
The following could be a significant factor in the failure of an engine to develop full power at take-off: _______.
improper adjustment of the carburetor heat valve control
55
Why should a carburetor be 'soaked' before its installation is considered complete?
It conditions the diaphragm to the operability with which they were calibrated
56
Correct idle mixture adjustment is indicated if movement of the mixture control to the cut-off position results in _______.
slight RPM increase (50 RPM) and then it drops off
57
The difference between a 'cold' and a 'hot' spark plug is the variation in _______.
length of the insulator core nose
58
An aircraft magneto is shut off by _______.
grounding the primary circuit
59
The fourth electrode in the magneto sparking order of a nine-cylinder radial engine serves cylinder _______.
4
60
The magneto timing should ensure that the E-gap position occurs when the breaker points are _______.
just opening
61
At what speed must a crankshaft turn if each cylinder of a four-stroke cylinder engine is to be fired 200 times a minute?
400 RPM
62
A magneto impulse coupling is used to _______.
provide a high voltage advanced spark during start
63
During routine inspection of a magneto, the breaker points are found to be badly pitted and burned. A likely cause would be _______.
a faulty primary capacitor
64
A manifold pressure gauge indicates _______.
the differential pressure between the intake manifold and atmosphere
65
A hissing sound from the exhaust stacks when the propeller is being pulled manually indicates _______.
a cracked exhaust stack
66
How should the exhaust system be inspected on an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat?
X-ray the exchanger to detect cracks
67
By use of a differential pressure tester, it is determined that cylinder #1 of a nine-cylinder radial engine will not hold pressure after the crankshaft has been rotated from top dead center compression stroke. How can this indication usually be interpreted?
a normal indication
68
What is exhaust valve blow-by?
A condition where exhaust gases escape past the exhaust valve into the engine crankcase. ## Footnote This can indicate issues such as valve damage or insufficient clearance.
69
How should the exhaust system be inspected on an aircraft with an exhaust heat exchanger?
Inspect by: * Hydrostatically testing * X-raying the exchanger to detect cracks * Removing the outer air shroud * Using an exhaust gas analyzer
70
What does a pressure test indicate if cylinder 113 of a nine-cylinder radial engine will not hold pressure after rotating the crankshaft?
Indications may include: * Exhaust valve blow-by * Badly worn or damaged piston rings * A damaged exhaust valve or insufficient exhaust valve clearance
71
What is a likely reason for excessive blow-by after installing a new set of piston rings?
Possible reasons include: * Improper valve seating * Insufficient end gap * Worn valve guides * Failure to shim the ring gaps
72
What could cause one fuel flow indicator to read higher than another on a twin-engine aircraft with fuel-injected engines?
Probable causes include: * Carburetor icing * Alternate air door stuck open * Excessive intake valve clearance * One or more fuel nozzles are clogged
73
What type of connecting rod is normally used on a horizontal opposed engine?
Master and articulated type
74
What is the term for the piston ring installed below the compression rings?
Oil scraper ring
75
How can cylinders that have been chrome plated be identified?
By the color of the paint: * Green paint * White paint * Blue paint * Orange paint
76
If a 0.003 oversize stud is identified by the prefix P003 after the part number, what will be the color painted on the stud?
Orange
77
What is the piston displacement for a six-cylinder engine with a bore of 4.375 inches and a stroke of 5.125 inches?
462.25 cubic inches
78
What is the cambered side of a propeller blade known as?
The blade face
79
What is a blade datum point on a propeller?
A specified distance from the center of the hub
80
What is the term for the actual distance a propeller moves through the air in one revolution?
The effective pitch
81
What is the difference between the propeller pitch and the dynamic pitch called?
The effective pitch
82
In cruising flight, where is a propeller typically operating?
In the alpha range
83
Where are tractor propellers mounted?
On the front of an engine and push the aircraft through the air
84
What is the most efficient angle of attack for a propeller blade?
In the range of +2° to +4°
85
What does a propeller blade cuff do?
Strengthens the propeller blade
86
What causes front cone bottoming during propeller installation?
The front cone becomes bottomed in the front propeller hub cone seat before the rear cone has engaged
87
For light aircraft with metal propellers of up to approximately 6 feet in diameter, how much can the propellers be out of track?
No more than ¼ inch
88
What is a probable cause of trouble if a hydraulic propeller does not feather?
The governor is not cutting out in high pitch
89
How can proper operation of the electric deicing boots on individual propeller blades be best determined?
By observing the ammeter or loadmeter for current flow
90
What connects the piston to the connecting rod?
Piston pin
91
What should be done if a turbine engine catches fire during a start?
Turn off fuel (pull fire handle) and continue cranking
92
What is turbocharger speed control achieved from?
Wastegate position
93
Which types of bearings are ideal because they resist high temperatures?
Ball and roller bearings
94
What is the cowl position during ground run?
Open

Powerplant (1 decks)

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