Engine instrument system

54問 • 1年前

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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 6. Leaking at line B nut 7. Will not zero out 8. Fogged

Which statement is correct concerning a thermocouple-type temperature indicating instrument system?

It requires no external power source

The indication on a thermocouple-type cylinder head temperature indicator is produced by

A current generated by the temperature difference between dissimilar metal hot and cold junctions

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

Which of the following types of electric motors are commonly used in electric tachometers?

Synchronous motors

Engine pressure ratio is the total pressure ratio between the

Front of the compressor and the rear of the turbine

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

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 more fuel nozzles are clogged

The principal fault in the pressure type fuel flow meter indicating system, installed on a horizontally opposed continuous-flow fuel injected aircraft reciprocating engine, is that a plugged fuel injection nozzle will cause a

Higher than normal fuel flow indication

A manifold pressure gauge is designed to

Indicate absolute pressure in the intake manifold

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

Immediately aft of the last turbine stage

An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine is known as

Bootstrapping

(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 in the engine inlet air pressure, and indicates volumetric efficiency. Regarding the above statements,

Only No. 1 is true

A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering

Prevailing atmospheric pressure

Thermocouple leads

Are designed for a specific installation and may not be altered

The EGT gauge used with reciprocating engines is primarily used to furnish temperature readings in order to

Obtain the best mixture setting for fuel efficiency

Engine oil temperature gauges indicate the temperature of the oil

Entering the engine

Basically, the indicator of a tachometer system is responsive to change in

Frequency

The purpose of an exhaust gas analyzer is to indicate the

Fuel/air ratio being burned in the cylinders

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

Diaphragm or bellows

Engine pressure ratio is determined by

Dividing turbine outlet total pressure by engine inlet total pressure

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 6. Mounting screw loose 7. Leaking at line B nut 8. Fogged

2,4,5,8

The engine pressure ratio (ERP) indicator is a direct indication of

Engine thrust being produced

What unit in a tachometer system sends information to the indicator?

The three-phase ac generator

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

The fuel-flow indication data sent from motor driven impeller and turbine, and motor less type fuel flow transmitters is a measure of

Fuel mass-flow

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 damage or loss of turbine efficiency

Why do helicopters require a minimum of two synchronous tachometer systems?

One indicates engine RPM and the other main rotor RPM

(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 Regarding the above statements,

Both No. 1 and No.2 is true

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

Noticeable shift in EPR

The fuel-flow indicator rotor and needle for a motor- impeller and turbine indicating system is driven by

An electrical signal

. (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 makings are based are based on installed engine operating limits which may not exceed (but necessarily equal to) those limits shown on the engine Type Certificate Data Sheet. Regarding the above statements,

Both No. 1 & No. 2 are true

A red triangle, dot, or diamond mark on an engine instrument face or glass indicates

The maximum limit for high transients such as starting

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

Turbine inlet temperature

Which unit most accurately indicates fuel consumption of reciprocating engine?

Fuel flow meter

What basic meter is used to indicate cylinder head temperature in most aircraft?

Galvanometer

What instrument indicates the thrust of a gas turbine engine?

Engine pressure ratio indicator

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

Monitor engine RPM during starting and to indicate overspeed conditions

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 with

An increased fuel flow indication on the gauge

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

A common type of electrically operated oil temperature gauge utilizes

Either wheatstone bridge or ratio meter circuit

Jet engine thermocouples are usually constructed of

Chromel-alumel

Which of the following is a primary engine instrument?

Tachometer

The RPM indication of a synchronous ac motor- tachometer is governed by the generator

Frequency

A bourdon-tube instrument may be used to indicate 1. Pressure 2. Temperature 3. Position 4. Quantity

1 and 2

A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering

Prevailing atmospheric pressure

Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type? P

Bourdon tube

The fuel-flow indication system used with many fuel- injected opposed engine airplanes utilizes a measure of

Fuel pressure

The fuel flowmeter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engines measures the fuel pressure drop across the

fuel nozzles

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

Turbine inlet temperature

Where are the hot and cold junctions located in an engine cylinder cylinder temperature indicating system?

The hot junction is located at the cylinder and the cold junction is located at the instrument

Motor driven impeller and turbine fuel flow transmitters are designed to transmit data

Using aircraft electrical system power

In what units are turbine engine tachometers calibrated?

Percent of engine RPM

A change in engine manifold pressure has a direct effect on the

Mean effective cylinder pressure

airlaw

ユーザ名非公開 · 119問 · 1年前

airlaw