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A&P - Powerplant > Turbine > Flashcards

Turbine Flashcards

1
Q

at what point on an axial-flow turbojet engine will the highest gas pressure occur…?

A

at the compressor outlet

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2
Q

the rotor blades of an axial-flow compressors are usually made from what type of material?

A

Stainless steel

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3
Q

one function of the nozzle diaphram in a turbine engine is to?

A

direct the flow of gasses to strike the turbine blades at the desired angle

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4
Q

what is the profile of a turbine engine compressor blade?

A

a reduced blade tip thickness

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5
Q

the fan rotational speed of a dual axial compressor forward fan engine is the same as the…?

A

low pressure (LP) compressor

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6
Q

the abbreviation Pt7 used in turbine engine terminology means?

A

the total pressure at station 7

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7
Q

the bending of blades and vanes in a turbine engine…?

A

should be performed parallel to the length of the blade using smooth contors to minimise stress points

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8
Q

what turbine engine section provides for proper mixing of the fuel /air mixture?

A

combustion section

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9
Q

in a gas turbine engine, combustion occurs at a constant…?

A

pressure

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10
Q

which statement is true regarding jet engines?

A

at the higher engine speeds, thrust increases rapidly with small increases in RPM

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11
Q

some high volume turbo-prop and turbo-jet engines are equipped with two spol or split compressors. when these engines are operated at high alitiudes, the…?

A

low-pressure rotor will increase in speed as the compressor load decreases in the lower density air.

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12
Q

turbine nozzle diaphrams located on the upstream side of each turbine wheel, are used in the gas turbine engine to…?

A

increase the velocity of the heated gases flowing past the point.

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13
Q

where is the highest gas pressure in a turbojet engine?

A

the entrance of the burner section

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14
Q

an exhaust cone place aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to…?

A

increase and the velocity to decrease

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15
Q

what is the function of the stator vane assembly at the dicharge end of a typical axial-flow compressor?

A

to straighten airflow to eliminate turbulence

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16
Q

the turbine section of a jet engine drives…?

A

drives the compressor section

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17
Q

when starting a turbine engine?

A

a hot start is indicated if the exhause gas temps exceed specified limits

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18
Q

in the dual axial-flow or twin spool compressor system, the first stage turbine drives the …?

A

N2 compressor

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19
Q

which of the following may be used to mark turbine engine components exposed to high temps?

A

layout die

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20
Q

when starting a turbine engine, a hung start is indicated if the engine?

A

fails to reach idle RPM

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21
Q

what are the two basic elements of the turbine section in a turbine engine?

A

stators and rotors

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22
Q

which of the following acts as a diffuser in a turbine engine and converts velocity to pressure?

A

Stators

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23
Q

The function of the exhaust cone assembly of a turbine engine is to?

A

Straighten and collect the exhaust gases into a solid exhaust jet

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24
Q

What are the two functional elements in a centrifugal compressor?

A

impeller and diffuser

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25
Q

The components of a centrifugal compressor section consist of the impeller, diffuser and?

A

Manifold

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26
Q

What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine?

A

Retrim the engine

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27
Q

If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism, but otherwise have no defects, they?

A

Must be degaussed before use

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28
Q

A turbine engine compressor which contains vanes on both sides of the propeller is a…?

A

double entry centrifugal compressor

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29
Q

What is the first engine instrument indication of a successful start of a turbine engine?

A

A rise in exhaust gas temperature

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30
Q

Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as…?

A

Pt7

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31
Q

Who establishes the recommended operating time between overhauls of a turbine engine used in general aviation?

A

the engine manafacture

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32
Q

Turbine engine components exposed to high temperatures generally may not be marked with?

A

Wax, grease pencil or a graphite lead pencil

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33
Q

Who establishes mandatory replacement times for critical components of a turbine engine?

A

The engine manufacturer

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34
Q

Main bearing oil seals used with turbine engines are usually what type?

A

Labyrinth and/or carbon rubbing

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35
Q

How does a dual axial-flow compressor improve the efficiency of a turbo jet engine?

A

Higher compression ratios can be obtained

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36
Q

Three types of turbine blades are?

A

Impulse, reaction, and impulse-reaction

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37
Q

Which statements are true regarding aircraft engine propulsion?

A

An engine driven propeller imparts a relatively small amount of acceleration to a large mass of air

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38
Q

The basic gas turbine engine is divided into two main sections. the cold section and the hot section.
1. The cold section includes the engine inlet, compressor, and the turbine sections
2. The hot section includes the combuster, diffuser, and exhaust sections

A

NEITHER 1 NOR 2 is true

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39
Q
  1. Welding and straightening of turbine engine rotating airfoils does not require special equipment
  2. Welding and straightening of turbine engine rotating airfoils is commonly recommended by the manafacture
A

NEITHER 1 NOR 2 are true

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40
Q

The advantage of the axio flow compressor is its?

A

High peak efficiency

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41
Q

What is one purpose of the stator blades in the compression section of the turbine engine?

A

To control direction of the air flow

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42
Q

What is the purpose of the diffuser section in a turbine engine?

A

To increase pressure and reduce velocity

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43
Q

Where do stress rupture cracks usually appear on turbine blades?

A

Across the leading edge or trailing edge at right angles to the edge length

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44
Q

In which type of turbine engine combustion chamber is the case and liner are removed and installed as one unit during routine maintenance?

A

Can

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45
Q

The diffuser of a jet engine is located between?

A

The compressor section and the burner section

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46
Q

When the leading edge of a first stage, turbine blade is found to have stress rupture cracks, which of the following should be suspected?

A

Overtemp condition

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47
Q

Turbine blades are generally more susceptible to operating damage than compressor blades because of?

A

The exposure to high temps

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48
Q

Which of the following is the ultimate limiting factor of a turbine engine operation?

A

Turbine inlet temperature

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49
Q

The recurrent ingestion of dust or other fine airborne particles into a turbine engine can result in?

A

Erosion damage to the compressor and turbine sections

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50
Q

Which of the following engine variables is the most CRITICAL during turbine engine operation?

A

Turbine inlet temperature

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51
Q

Reduced blade vibration and improved airflow characteristics in gas turbine engines are brought about by?

A

Shrouded turbine rotor blades

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52
Q

Which turbine engine compressor offers the greatest advantages for both starting flexibly and improved high altitude performance?

A

Split-spool, axial-flow

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53
Q

Jet engine turbine blades removed for detailed inspection must be installed in?

A

in the same spot

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54
Q

An advantage of the centrifugal-flow compressor is its high?

A

pressure rise per stage

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55
Q

the highest heat-to-metal contact in the jet engine is the …?

A

turbine inlet guide vanes

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56
Q

Which two elements make up the axial-flow compressor assembly?

A

Rotor and stator

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57
Q

The two types of centrifugal compressor impellers are?

A

Single entry and double entry

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58
Q

Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to defuse the air. These stationary blades are called?

A

Stators

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59
Q

standard sea level pressure is…?

A

29.92” Hg

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60
Q

Using standard atmospheric conditions, the standard sea level temperature is?

A

59°F

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61
Q

When aircraft turbine blades are subjected to excessive heat stress, What type of failures would you expect?

A

Stress rupture

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62
Q

In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to?

A

Straighten the air flow and eliminate turbulence

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63
Q

Compressor field cleaning on a turbine engine is performed primarily in order to?

A

Prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surface

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64
Q

Hot section inspections for many modern turbine engines are required?

A

On a time or cycle basis

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65
Q

The purpose of the shrouds on the turbine blades of an axial-flow compressor engine is to?

A

reduce vibration

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66
Q

In a dual axial-flow compressor, the first stage turbine drives?

A

N2 compressor

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67
Q

What should be done initially if a turbine engine catches fire when starting?

A

Turn off the fuel and continue engine rotation with the starter

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68
Q

What is the proper starting sequence for a turbo jet engine?

A

Starter, ignition, fuel

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69
Q

A weak fuel to air mixture along with normal airflow through a turbon engine may result in?

A

A lean die-out

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70
Q

Turbine engine flame out may be caused by improper….?

A

Fuel/air mixture

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71
Q

Turbine engine after flame is caused by?

A

Excess fuel in the combustion section, turbine or exhaust nozles

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72
Q

What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation

A

Variable guide vanes and/or compressor bleed valves

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73
Q

Name the working fluid that provides pressure to the variable inlet guide vane actuators used on some turbine engine compressors…?

A

hydraylic fluid

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74
Q

In a turbo engine with a dual spool compressor, the low speed compressor…?

A

seeks its own best operating speed

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75
Q

What is the function of the inlet guide vane assembly on an axial-flow compressor?

A

Direct the air flow into the first stage rotor blades at the proper angle

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76
Q

Which of the following is a good indication of a malfunctional fuel nozzle when inspecting the exhaustion of an aircraft turbine engine?

A

Hot spots on the tail cone

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77
Q

The stator vanes on an axial-flow compressor…?

A

convert velocity energy into pressure energy

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78
Q

The velocity of SUBSONIC air as it flows through a convergent nozzle?

A

Increases

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79
Q

The velocity of SUPERSONIC air as it flows through a diversion nozzle…?

A

Increases

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80
Q

The velocity of supersonic air as it flows through a diversion puzle.

A

Decreases

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81
Q

The pressure of SUBSONIC air as it flows through a convergant nozzle..?

A

Decreases

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82
Q

Anti icing of jet engine air inlets is commonly accomplished by?

A

Engine bleed air ducted through the critical areas

83
Q

Generally, when starting a turbo engine, the starter should be disengaged?

A

When the engine has reached self accelerating speed

84
Q

What is the primary advantage of an axial-flow compressor over a centrifugal compressor?

A

Greater pressure ratio

85
Q

The purpose of bleed valves, located in the beginning stages of the compressor, in an aircraft gas turbine engine is to?

A

Vent some of the air overboard to prevent a compressor stall

86
Q

What is meant by a double entry centrifugal compressor?

A

a compressor with vanes on both sides of the impeller

87
Q

What is the major function of the turbine assembly in a turbo jet engine?

A

Supplies the power to turn the compressor

88
Q

Stator blades in the compressor section of an axial-flow turbine engine?

A

Decrease the air velocity and prevent swirling

89
Q

Gas turbine engine comprises of which three main sections?

A

Turbine, compressor, combustion

90
Q

What type of turbine blade is most commonly used in aircraft jet engine…?

A

Impluse-reaction

91
Q

What is the primary factor which controls the pressure ratio of an axial-flow compressor?

A

Number of stages in the compressor

92
Q

The non rotating axial-flow compressor airfoils in an aircraft gas turbine engine are called?

A

Stator vanes

93
Q
  1. in a turbine engine axial-flow compressor, each consecutive pair of roter and stator blades constitutes a pressure stage.
  2. in a turbine engine axial-flow compressor, the number of rows of stages is determined by the amount of air and total pressure rise required.
A

BOTH 1 and 2 are true

94
Q

The air passing through the combustion chamber of a turbine engine is?

A

Used to support combustion and to cool the engine

95
Q

The stators in a turbine engine section of a gas turbine engine?

A

Increase velocity of the gas flow

96
Q

The compressor stators in a gas turbine engine act as diffusers to?

A

Decrease the velocity of the gas flow

97
Q

The procedure for removing the accumulation of dirt deposits on compressor blades is called?

A

Field cleaning

98
Q

Which of the following may be used to accomplish an internal inspection of an assembled turbine engine?

A

A boroscope

99
Q

What is the possible cause when a turbine engine indicates no change in power setting parameters, but the oil temperature is high…?

A

Enigne main bearing distress

100
Q

Newton’s first law of motion generally termed as the law of inertia states?

A

Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force

101
Q

Newton’s second law of motion generally termed as law of momentum states:
Acceleration is produced when a force acts on a mass.

A

The greater the mass, the greater amount of force needed

102
Q

A turbine engine hot section is particularly susceptible to which kind of damage?

A

Cracking

103
Q

Dirt particles in the air being introduced into the compressor of a turbine engine will form coating on all but which of the following?

A

Turbine blades

104
Q

Severe rubbing of turbine engine compressor blades will usually cause?

A

Galling

105
Q

Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?

A

Burner pressure

106
Q

If a turbine engine is unable to reach, take off EPR before its EGT limit is reached, this is an indication that the?

A

compressor may be damaged or contaminated

107
Q

The Brayton Cycle is known as the constant …?

A

Constant pressure cycle

108
Q

Continued and/or excessive heat and centrifugal force on a turbine engine rotor blade is likely to cause?

A

Creep

109
Q

If the RPM of an axial-flow compressor remains constant, the angle of the attack of the rotor blade can be changed by?

A

Changing the velocity of the airflow

110
Q

The compression ratio of an axial-flow compressor is the function of the?

A

Number of compressor stages

111
Q

Which of the following variables affect the inlet air density of a turbine engine?

A

Speed of the aircraft, altitude of the aircraft, and ambient temperature

112
Q

Which of the following factors affect a thermal efficiency of a turbine engine?

A

Turbine inlet temp, compressor ratio, turbine and compressor efficiency

113
Q

Why do some turbine engines have more than one turbo wheel attached to a single shaft??

A

to extract more power from the exhaust gasses than a single wheel can absorb

114
Q

The exhaust section of a turbine engine is designed to?

A

Impart high exit velocities to the exhaust gases

115
Q

Which Of the following types of combustion sections are used in turbine engines?

A

Multiple can, annular, can-annular

116
Q

A cool-off period prior to shutdown of a turbine engine is accomplished in order to?

A

too allow the turbine wheel to cool down before the case contracts around it

117
Q

What type of igniter plug is used in the low tension ignition system of an aircraft turbofan engine?

A

self-ionizing or shunted-gap plug type

118
Q

What is meant by a shrouded turbine?

A

the turbine blades are shaped so their ends form a band or shroud.

119
Q

What time is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet engine?

A

creep

120
Q

What is the purpose of the dump valve used on aircraft gas turbine engines?

A

The fuel is quickly cut off to the nozzles and the manifold are drained, preventing fuel boiling as a result of residual engine heat

121
Q

At what stage in a turbine engine are gas pressures the greatest?

A

Compressor outlet

122
Q

In what section of a turbojet engine is the jet nozzle located?

A

EXHAUST

123
Q
  1. Accumulation of contaminants in the compressor of a turbojet engine reduces aerodynamic efficiency of the blades.
  2. Two common methods for removing dirt deposits from turbojet engine compressor blades are a fluid wash and an abrasive grit blast.
A

BOTH 1 and 2 are true

124
Q

Hotspots in the combustion section of turbojet engine are possible indicators of?

A

Malfunctioning fuel nozzles

125
Q

Which of the following can cause fan blade shingling in the turbo fan engine?

A

Engine overspeed and/or FOD

126
Q

Compressor stall is caused by

A

A High angle of attack airflow through the first stages of compression

127
Q

The condition known as “hot streaking” in turbine engines is caused by?

A

A partially clogged fuel nozzle

128
Q

Refer to figure 1…
Determine which portion of the AD is applicable for Model O-690 series engines, serial No. 5863-40 with 283 hours time in service?

A

B, 1.

129
Q

A Cessna 180 aircraft has a McCauley propeller Modle No. 2A34C50/90A. The propeller is severely damaged in a ground accident, and this model propeller is not available for replacement. Which of the
following should be used to find an approved alternate replacement?

A

Aircraft Specifications/Type Certificate Data Sheets

130
Q

A Maule M-7-235 has a Lycoming 0-540-J1A5P and a Hartzell HC-C2YR-1BF/F8468A-6R. Where can you
find if this is an approved engine/propeller combination?

A

Aircraft Specifications/Type Certificate Data Sheet.

131
Q

Which of the following is used to monitor the mechanical integrity of the turbo engines, as well as to check the engine operation conditions of a turbine engine?

A

Exhaust gas Temp EGT

132
Q

What instrument on a gas turbine engine should be monitored to minimize the possibility of a hot start?

A

Turbine inlet temp

133
Q

In regard to using a turbine engine oil analysis program, which of the following is NOT true?

A

Generally, accurate trend forecast may be made after an engines first oil sample analysis

134
Q

In an aircraft turbine engine operating at a constant power, the application of the engine anti icing will result in?

A

a noticeable shift in engine EPR

135
Q

Engine pressure ratio EPR is the total pressure ratio between?

A

The front of the compressor and the rear of the turbine.

136
Q

What would be the possible cause if the gas turbine engine has high exhaust gas temperatures, high fuel flow, and low rpm at all engine power settings?

A

Turbine damage or loss of turbine efficiency

137
Q

What is the primary purpose of a tachometer on an axial-compressor turbine engine?

A

To monitor RPM during starting and to indicate overspeed conditions

138
Q

Engine pressure ration EPR indicator is a direct indication of?

A

Engine thrust being produced

139
Q

The exhaust gas temperature EGT indicator on a gas turbine engine provides a relative indication of the?

A

turbine inlet temp

140
Q

what instrument indicates the thrust of a gas turbine engine?

A

Engine pressure ratio EPR

141
Q

in a turbine engine, where is the turbine discharge pressure indicator sensor located?

A

Immediatley aft of the last turbine stage

142
Q

in what units are the turbine engine tachometers calibrated?

A

Percentage of engine RPM

143
Q

Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?

A

Diaphragm or bellows

144
Q

Instruments that measure relatively high fluid pressure, such as oil presure gauges, are uaually what type?

A

Bourdon tube

145
Q

The RPM indication of a synchronous AC motor-tachometer is governed by the generator…?

A

Frequency

146
Q

How are most turbine engine fire extinguishing systems activated?

A

Electrically discharged cartridges

147
Q

One way that the automatic ignition relight systems are activated on gas turbine engines is by a?

A

A drop in compressor discharge pressure

148
Q

When the starter switch to an aircraft gas turbine engine starter-generator is energized and the engine fails to rotate, one of the probable causes would be the?

A

The starter solenoid is defective

149
Q

Which of these characteristics is desirable in turbine engine oil?

A

High Flash Point

150
Q

The viscosity of a liquid is a measure of its?

A

Resistance to flow

151
Q

What type of oil system is usually found on a turbine engine?

A

Dry sump, Pressure, Spray

152
Q

Which of the following helps determine the proper grade of oil to be used in a particular engine?

A

Operating speed of the bearings

153
Q

The type of oil pumps most commonly used on turbulent engines are classified as?

A

Positive displacement pumps

154
Q

In a jet engine which uses a fuel oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulates the flow of the?

A

Oil through the heat exchanger

155
Q
  1. Fuel may be used to cool oil in gas turbine engines.
  2. Ram air may be used to cool oil and gas turbine engines
A

BOTH 1 and 2 are True

156
Q

In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the?

A

Turbine, Vanes, Blades and Bearings

157
Q

Oil picks up the most heat from which of the following turbine engine components?

A

Turbine bearing

158
Q

Which of the following is a function of the fuel/oil heat exhanger on a turbojet engine?

A

Increase fuel temp

159
Q

After making it welded repair to a pressurised type turbine oil tank, the tank should be pressure checked to?

A

not less than 5 PSI plus the MAXIMUM operating pressure of the tank

160
Q

Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?

A

To provide a relatively constant oil flow to the main tank bearing at all engine speeds

161
Q

Possible failure related ferrous metas particals in turbine engine oil cause an (electrical) indicating type magnetic chip detector to indicate their presence by?

A

Bridging the gap between the detector center (positive) electrode and the ground electrode (negative)

162
Q

What would be the probable result if the oil system pressure relief fail should stick in the OPEN position?

A

Insufficient lubrication

163
Q

According the the Federal Aviation Regulations (FARs), oil tank fillers on turbine engines must be marked with the word…?

A

OIL

164
Q

What is the primary purpose of the oil breather pressurisation system that is used on turbine engines?

A

Provide a proper oil spray pattern from the main bearing oil jets

165
Q

The purpose of directing bleed air to the outer turbine case on some engines is to…?

A

Provide optimum turbine blade tip clearance by controlling thermal expansion

166
Q

In order to relieve excessive pump pressure in an engine’s internal oil system, most engines are equipped with a?

A

Relief Valve

167
Q

What is the purpose of the check valve generally used in a dry sump lubrication system?

A

To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods

168
Q

Which of the following factors has the least effect on oil consumption of a specific engine?

A

Mechanical efficiency

169
Q

How is the oil collected by the piston oil ring returned to the crankcase?

A

through holes drilled in the piston oil ring groove

170
Q

Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?

A

fuel line for oil dilution system

171
Q

As an aid to cold weather starting, the oil dilution systems thins the oil with…?

A

Gasoline

172
Q

The basic oil pressure relief valve setting for a newly overhauled engine is made in?

A

In the overhaul shop

173
Q

Where is the oil temp bulb located on a dry sump reciprocating engine ?

A

Oil Inlet Line

174
Q

Cylinder walls are usually lubricated by…?

A

Splashed or sprayed oil

175
Q

if an oil filter element becomes completely clogged, the bypass…?

A

The bypass valve will open, and the oil pump will supply unfiltered oil

176
Q

Oil accumulating in the cylinders of an inverted in line engine and in the low cylinders of a radial engine is normally reduced or prevented by?

A

Extended cylinder skirts

177
Q

What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?

A

The oil becomes contaminated with moisture, acids, and finely divided suspended solid particals

178
Q

What determines the minimum particle size, which will be excluded or filtered by a cuno type (stacked disc edge filtration) filter?

A

The spacer thickness

179
Q

What is the primary purpose of the hopper located in the oil supply tank of some dry sump engine installations?

A

To reduce the time required to warm the oil to operating temps

180
Q

The purpose of the flow control valve in a reciprocating engine oil system is to?

A

Direct the oil through or around the oil cooler

181
Q

Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?

A

in the crankshaft throws

182
Q

Why is an aircraft reciprocating engine oil tank on a dry sump lubrication system equipped with a vent line?

A

To prevent pressure build up in the oil tank

183
Q

Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by?

A

oil control rings on the piston

184
Q
  1. Wet sump oil systems are most commonly used in gas turbine engines ❌️
  2. In most turbine engine oil tanks, a slight pressurization of the tank is designed to ensure a positive flow of oil.✔️
A

ONLY 2 is true

185
Q

The pumping capacity of the scavenger pump in a dry sump aircraft engines lubrication system is?

A

Is greater than the capacity of the oil supply pump

186
Q

In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?

A

Engine below normal operating temps

187
Q

A turbine engine dry sump lubrication system of the self contained, high pressure design consists of?

A

consists of pressure, breather, and scavenger subsystems

188
Q

Lube system last chance filters in turbine engines are usually cleaned?

A

during overhaul

189
Q

The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to?

A

Prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet

190
Q

As a general rule, a small amount of fuzy particles or gray metallic paste on the turbine engine magnetic chip detector is considered?

A

Is considered to be the result of normal wear

191
Q

The purpose of a dwell chamber in a turbine engine oil tank is to provide?

A

Seperation of entrained air from scavenged oil

192
Q

Which of the following bearing types must be continuously lubricated by pressure oil?

A

Plain

193
Q

A capacity type ignition system is used almost universally on turbine engines, primarily because of its high voltage and…?

A

High Heat Intensity

194
Q

How does the ignition system of a gas turbine engine differ from that of a reciprocating engine?

A

A high energy spark is required for ignition.

195
Q

In a turbine engine DC capacitor discharge ignition system, where are the high voltage pulses formed?

A

at the triggering transformer

196
Q

Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plugs?

A

The high intensity spark cleans the ignitor.

197
Q

To prevent seizing of the igniter plug the threads in many cases are?

A

Lubricated with an anti seize compound

198
Q

To prevent seizing of the ignitor plugs the threads in many cases are?

A

silver plated

199
Q

igniter plugs have nickel chromium plating for?

A

High heat and corrosion resistance

200
Q

The constrained gap igniter plug used in some gas turbine engines operates at a cooler temp because of?

A

The construction is such that the spark occurs beyond the face of the combustion chamber liner

201
Q

Generally, when removing a turbine engine ignited plug in order to eliminate the possibility of the technician receiving a lethal shock, the ignition switches is turned off and?

A

The ignitor lead is disconnected from the plug and the center electrode grounded to the engine after disconnecting the transformer-exciter input lead and waiting the prescribed time.

202
Q

Great caution should be exercised in handling damaged hermetically sealed turbine engine ignitor transformer units because?

A

Some contain ratioactive material

203
Q

Igniter plug used in turbine engines have a long service life because they?

A

They do not require continuous operation

A&P - Powerplant (4 decks)

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