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15 Cards in this Set
- Front
- Back
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In what units is a tachometer for reciprocating engine calibrated? |
100th of RPM |
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In what units is the tachometer for turbine engine calibrated? |
The percentage of engines rated take off RPM |
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Where does the manifold pressure gauge used on aircraft reciprocating engines pick up the pressure it measures? |
From the intake manifold of the engine |
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What are two types of pickups used for measuring the cylinder head temperature of a reciprocating engine? |
Thermocouple installed under the gasket of the spark plug on the hottest running cylinder or a bayonet held against the cylinder head by a spring |
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Why do most engine oil pressure gauges have a restrictor in the line between the engine and the instrument? |
To dampen out pressure pulsation in the oil to keep the needle from oscillating |
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What is used to measure the fuel flow of a horizontally opposed fuel injected reciprocating engine? |
Pressure gauge that measures the drop in pressure across the injector nozzels |
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What is indicated if the needle of Ratiometer-type oil temperature indicator pegs to the high side of the dial as soon as the aircraft Master switch is turned on? |
It indicates an open in the bulb circuit that causes it to read an infinite resistance, hence the higher indication on the dial |
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What type of indicating system is used to measure the exhaust gas temperature of a turbine engine? |
Thermocouples arranged in an averaging circuit, installed on the tailpipe of the engine |
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What should a thermocouple type cylinder head temperature indicator read when the engine is not operating? |
The outside air temperature |
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How does a torquemeter actually measure the torque produced by an engine? |
It's actually a pressure gauge which measures the pressure produced with a sensor proportional to the amount of strain in the torsional shaft that drives the reduction gears of the turbprop engine |
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What two precious are measured to get the engine pressure ratio of a turbojet engine? |
The turbine discharge total pressure, and the compressor inlet total pressure |
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Of what two materials are the thermocouples made that are used in a turbine engine exhaust gas temperature system? |
Chromel and alumel |
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What kind of mechanism is normally used to measure oil pressure in a reciprocating engine? |
Bourdon tube |
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What is measured by the tachometer used in a two spool gas turbine engine? |
The low-pressure compressor RPM at N1, and the high-pressure compressor RPM at N2 |
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Does the tachometer of a geared reciprocating engine indicate the speed of the crankshaft or the propeller shaft? |
Speed of the crankshaft |
