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Power-Plant
ENGINE INSTRUMENT SYSTEMS
| Question | Answer |
|---|---|
| In what units is the tachometer for a reciprocating engine calibrated? | In hundreds of RPM. |
| In what units is the tachometer for a turbine engine calibrated? | In percent of the engine's rated takeoff RPM. |
| Where does the manifold pressure gage used on an aircraft reciprocating engine pick up the pressure it measures? | From the intake manifold of the engine. |
| What are two types of pickups used for measuring the cylinder head temperature of a reciprocating engine? | The thermocouple can be embedded in a gasket that is installed under the spark plug of the hottest running cylinder, or it can be in a bayonet that is held against the cylinder head by a spring. |
| Why do most engine oil pressure gages have a restrictor in the line between the engine and the instrument? | The restrictor damps out pressure pulsations in the oil to keep the needle from oscillating. |
| What is used to measure the fuel flow of a horizontally opposed, fuel-injected reciprocating engine? | A pressure gage that measures the pressure drop across injector nozzles. |
| What is indicated if the needle of a ratiometer-type oil temperature indicator pegs to the high side of the dial as soon as the aircraft master switch is turned on? | There is an open in the bulb circuit that causes the instrument to see an infinite resistance. The higher the resistance in the bulb circuit, the higher the temperature indication. |
| What type of indicating system is used to measure the exhaust gas temperature of a turbine engine? | A set of thermocouples arranged in an averaging circuit. These thermocouples are installed in the tail pipe of the engine. |
| What should a thermocouple-type cylinder head temperature indicator read when the engine is not operating? | The temperature of the outside air. |
| How does a torquemeter actually measure the torque produced by an engine? | A torquemeter is actually an oil pressure gage. The pressure it measures is produced in a torque sensor and is proportional to the amount of strain in the torsional shaft that drives the reduction gears of the turboprop engine. |
| What two pressures are measured to get the Engine Pressure Ratio of a turbojet engine? | The turbine discharge total pressure and the compressor inlet total pressure. |
| Of what two materials are the thermocouples made that are used in a turbine engine exhaust gas temperature system? | Chromel and alumel. |
| What kind of mechanism is normally used to measure oil pressure in a reciprocating engine? | A bourdon tube mechanism. |
| What is measured by the tachometers used on a two-spool gas turbine engine? | The N1 tachometer shows the RPM of the low-pressure compressor, and the N2 tachometer shows the RPM of the high-pressure compressor. |
| Does the tachometer of a geared reciprocating engine indicate the speed of the crank shaft or of the propeller shaft? | The speed of the crankshaft. |
Created by:
Aima2019
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