Engine instrument systems Flashcards
Where would a carburetor air temperature bulb be located?
In the ram air intake duct
Name the basic components of a fuel indicator system:
Transmitter and an indicator
What does the manifold gauge indicate and how is it calibrated?
It measures absolute pressure in the engine manifold and is calibrated in inches of mercury
What does a tachometer indicate on a reciprocating engine?
Engine RPM
Where should the thermocouple be installed on a reciprocating engine using a single probe cylinder head temperature system?
On the hottest cylinder
What is the electrical source for a cylinder head temperature system?
A thermocouple
During engine operation where should the propeller control be set when checking the manifold pressure?
Low pitch, high RPM
What directly controls manifold pressure?
Throttle opening and engine RPM
On an engine equipped with a fixed pitch propeller what controls both manifold pressure and engine RPM?
The throttle control
How are gas turbine tachometers calibrated?
In percent of RPM
What are turbine tachometer gauges designed to indicate?
Percentage of compressor RPM
What does turbine engine EGT indicate?
The average temperature of turbine discharge gases
On a turbine engine, what does exhaust gas temperature indicate and how is it obtained?
EGT is the average temperature of the turbine discharge gases and is obtained by thermal couples placed near the turbine exit
On a turbine engine, what is the engine pressure ratio and what does it indicate?
It’s the ratio between total inlet pressure and total turbine exhaust pressure. It’s used to indicate thrust developed by the engine.
What does turbine engine pressure ratio indicate?
Thrust being developed by the engine
What pressures are measured to obtain engine pressure ratio?
Total inlet pressure and total turbine exhaust pressure
Why is fuel flow monitored?
To determine fuel consumption and engine performance
What is a shaft horsepower?
The torque developed by a turboprop or turboshaft engine
What is the possible cause when turboprop engine oil pressure drops off severely and the oil supply remains full?
Oil pressure transmitter, or indicator malfunction
Can the EGT system on a turbine engine be checked without running the engine?
Yes. By checking resistance of the thermocouple and its circuits.
What unit of measure is generally used to indicate fuel flow?
Pounds or gallons per pound
