Exhaust pyrometer readings provide an indication of the （）

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• The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.

  A . water B . oil C . heat D . steam

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• The color of the exhaust from a diesel engine should be （）

  A . clear B . hazy light brown C . hazy light blue D . hazy light grey

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• For an ordinary four-stroke engine the exhaust valves open （）.

  A . after TDC B . before TDC C . after BDC D . before BDC

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• In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

  A . downwards；upwards B . upwards；downwards C . downwards；downwards D . upwards；upward

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• （）is a caing used for exhaust pipe from the engines.

  A . The funnel B . The messroom C . The galley D . The satellite antenna

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• （） is the removal of exhaust gases by blowing in fresh air.

  A . Gas exchange B . Charging C . Scavenging D . Supercharging

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• A pyrometer is an instrument commonly used to measure（）

  A . cylinder pressure B . flame intensity C . exhaust gas temperature D . crankshaft axial alignment

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• High exhaust back pressure will result in an increase in （）

  A . turbocharger efficiency B . engine power output C . carbon deposits on fuel injectors D . cylinder scavenging

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• The satisfactory operation of diesel engine exhaust valves usually depends on（）

  A . the proper back pressure B . the cooling water temperature C . correct timing and proper seating D . accurate metering and the exhaust temperature

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• Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）

  A . When heated, it will move proportional to the amount the metal has lengthened or expanded B . The pointer associated with the pyrometer scale can be made to also measure engine RPM C . It can be utilized in exhaust manifolds and heat exchangers interchangeably D . It can indicate temperature at a distant point from the source heat

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• How would the exhaust of a properly operating diesel engine appear?（）.

  A . Light blue haze B . Light brown haze C . Light gray haze D . Perfectly clear

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• In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）

  A . increased engine back pressure B . sulfuric acid corrosion C . surface pitting of the turbocharger D . moisture impingement on the turbocharger compressor blade

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• A diesel engine emits blue exhaust smoke as a result of（）

  A . cold intake air B . excessive compression pressure C . excessive cylinder lubrication D . a light load

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• Four strokes consist of suction, compression, （） and exhaust stroke.

  A . combustion B . condensation C . charging D . evaporatio

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• Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.

  A . (1) and (2) B . (1) only C . (2) only D . (1),(2) and (3)

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• Exhaust gas pyrometers are useful for（）

  A . detecting faulty combustion in individual cylinders B . adjusting fuel racks to maintain equal loading between cylinders C . adjusting the load limit setting of the governor at idle conditions D . calculating engine horsepower

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• Pyrometers commonly found on diesel engine exhaust systems, consist of（）

  A . pyrostats and a voltmeter B . a gas-filled bellows, a tube and a pressure gauge C . thermocouples and a voltmeter D . ammeters and thermocouple

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• A dry-type exhaust muffler clogged with soot, will cause（）

  A . low exhaust temperature B . loss of engine power C . burned intake valves D . engine racing

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• Diesel engine exhaust noise can be reduced in an exhaust muffler by （）

  A . changing the direction of exhaust gas flow B . increasing the exhaust gas velocity C . changing the exhaust gas weight D . increasing the exhaust gas static pressure

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• A built-up exhaust valve is one in which （）.

  A . the stem and heads are made of different material B . low-alloy steel is used throughout C . a replaceable valve disk is welded to the head D . the self-centering action comes from motion of the valve stem in the guide

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• In an ordinary four-stroke engine the exhaust valves open （）

  A . after TDC B . before TDC C . after BDC D . before BDC

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• Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）

  A . cooling water leaving each cylinder B . fuel oil entering the injector C . exhaust gases at various locations D . lube oil at the bearing supplie

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• exhaust（）

  A．布料，织物 B．使筋疲力尽；耗尽 C．打破，破碎；缝隙 D．求婚

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