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Engine Instrument Systems

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tungchau0105's version from 2016-12-27 18:02

Section 1

Question Answer
Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type?
Dụng cụ đo lường áp lực chất lỏng tương đối cao, chẳng hạn như đồng hồ đo áp suất dầu, thường là loại gì?
Bourdon tube
The indication on a thermocouple-type cylinder head temperature indicator is produced by
Các dấu hiệu về một cặp nhiệt điện loại xi lanh chỉ số nhiệt độ đầu được sản xuất bởi
a current generated by the temperature difference between dissimilar metal hot and cold junctions
một dòng điện được tạo ra bởi sự khác biệt về nhiệt độ giữa chỗ nối kim loại khác nhau nóng và lạnh
If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate?Moves off-scale on the zero side of the meter
The EGT gauge used with reciprocating engines is primarily used to furnish temperature readings in order toobtain the best mixture setting for fuel efficiency
A common type of electrically operated oil temperature gauge utilizeseither a wheatstone bridge or ratiometer circuit
A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registeringprevailing atmospheric pressure
A red triangle, dot, or diamond mark on an engine instrument face or glass indicatesthe maximum limit for high transients such as starting
What basic meter is used to indicate cylinder head temperature in most aircraft?Galvanometer
Which of the following instrument discrepancies require replacement of the instrument?1. Red line missing from glass.2. Glass cracked.3. Case paint chipped.4. Will not zero out.5. Pointer loose on shaft.2, 4, 5, 8
Jet engine thermocouples are usually constructed ofchromel-alumel
Engine pressure ratio is determined bydividing turbine outlet total pressure by engine inlet total pressure
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Section 2

Question Answer
What instrument on a gas turbine engine should be monitored to minimize the possibility of a 'hot' start?Turbine inlet temperature
In what units are turbine engine tachometers calibrated?Percent of engine RPM
Which statement is correct concerning a thermocouple-type temperature indicating instrument system?It requires no external power source
Which unit most accurately indicates fuel consumption of a reciprocating engine?Fuel flowmeter
1) Generally, when a turbine engine indicates high EGT for a particular EPR (when there is no significant damage), it means that the engine is out of trim.(2) Some turbine-powered aircraft use RPM as the primary indicator of thrust produced, others use EPR as the primary indicator.both No. 1 and No. 2 are true
Thermocouple leadsare designed for a specific installation and may not be altered
The principal fault in the pressure type fuel flowmeter indicating system, installed on a horizontally opposed continuous-flow fuel injected aircraft reciprocating engine, is that a plugged fuel injection nozzle will cause ahigher than normal fuel flow indication
What is the primary purpose of the tachometer on an axial-compressor turbine engine?Monitor engine RPM during starting and to indicate overspeed conditions
Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?Diaphragm or bellows
The purpose of an exhaust gas analyzer is to indicate thefuel/air ratio being burned in the cylinders
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Section 3

Question Answer
Where are the hot and cold junctions located in an engine cylinder temperature indicating system?The hot junction is located at the cylinder and the cold junction is located at the instrument
What would be the possible cause if a gas turbine engine has high exhaust gas temperature, high fuel flow, and low RPM at all engine power settings?Turbine damge or loss of turbine efficiency
Motor driven impeller and turbine fuel flow transmitters are designed to transmit datausing aircraft electrical system power
In addition to fuel quantity, a computerized fuel system (CFS) with a totalizer-indicator provides indication of how many of the following?1. Fuel flow rate.2. Fuel used since reset or initial start-up.3. Fuel time remaining at current power setting.4. Fuel temperature.Three
The RPM indication of a synchronous ac motor-tachometer is governed by the generatorfrequency
Basically, the indicator of a tachometer system is responsive to change infrequency
Why do helicopters require a minimum of two synchronous tachometer systems?One indicates engine RPM and the other main rotor RPM
A Bourdon-tube instrument may be used to indicate.1. pressure.2. temperature.3. position.4. quantity.1 and 2
Which statement is true regarding a thermocouple-type cylinder head temperature measuring system?The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple
What instrument indicates the thrust of a gas turbine engine?Engine pressure ratio indicator
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Section 4

Question Answer
In regard to using a turbine engine oil analysis program, which of the following is NOT true?Generally, an accurate trend forecast may be made after an engine's first oil sample analysis
Engine pressure ratio is the total pressure ratio between thefront of the compressor and the rear of the turbine
The fuel flowmeter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engines measures the fuel pressure drop across thefuel nozzles
What unit in a tachometer system sends information to the indicator?The three-phase ac generator
The fuel-flow indication system used with many fuel-injected opposed engine airplanes utilizes a measure offuel pressure
The fuel-flow indicator rotor and needle for a motor-impeller and turbine indicating system is driven byan electrical signal
An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbosupercharged aircraft engine is known asBootstrapping
On a twin-engine aircraft with fuel-injected reciprocating engines, one fuel-flow indicator reads considerably higher than the other in all engine operating configurations. What is the probable cause of this indication?One or more fuel nozzles are clogged
In a turbine engine, where is the turbine discharge pressure indicator sensor located?Immediately aft of the last turbine stage
On an aircraft turbine engine, operating at a constant power, the application of engine anti-icing will result innoticeable shift in EPR
The fuel-flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure offuel mass-flow
(1) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates the thrust produced.(2) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates volumetric efficiency.only No. 1 is true
(1) Powerplant instrument range markings show whether the current state of powerplant operation is normal, acceptable for a limited time, or unauthorized.(2) Powerplant instrument range markings are based on installed engine operating limits which may not exceed (but are not necessarily equal to) those limits shown on the engine Type Certificate Data Sheet.both No. 1 and No. 2 are true
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Section 5

Question Answer
The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of theturbine inlet temperature
A change in engine manifold pressure has a direct effect on themean effective cylinder pressure
A manifold pressure gauge is designed toindicate absolute pressure in the intake manifold
The engine pressure ratio (EPR) indicator is a direct indication ofengine thrust being produced
Engine oil temperature gauges indicate the temperature of the oilentering the engine
Which of the following is a primary engine instrument?Tachometer
Which of the following instrument conditions is acceptable and does NOT require immediate correction?1. Red line missing.2. Pointer loose on shaft.3. Glass cracked.4. Mounting screws loose.5. Case paint chipped.5
In an aircraft equipped with a pressure-drop type fuel-flow indicating system, if one of the injector nozzles becomes restricted, this would cause a decrease in fuel flow withan increased fuel flow indication on the gauge
Which of the following types of electric motors are commonly used in electric tachometers?Synchronous motors
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