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Heating Chamber temperature low加热室温度低
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考题
Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A.Cooling the air to a temperature just above dew pointB.Heating the air to a point at which moisture will boil off ,then re-cooling itC.Cooling the air to a point below dew point, then reheating itD.Heating the air and then cooling it to a point below dew point
考题
( )is monitored on the drain tank and header tank by magnetic switches with a 20seconds delay to prevent false alarms due to surging
A.Low pressure of the lubricating oilB.Low level of the lubricating oilC.High temperature of the lubricating oilD.High temperature of the cooling water
考题
If the exhaust gas temperature of the incinerator is too high, or if sparks are developed, What should you do?
A.Close the inlet and outletvalves for diesel oilB.Open the air nozzles in the secondary combustion chamber until it stopsC.Open the air nozzles in the primary combustion chamber until it stopsD.Close inlet valve for pressurized air
考题
High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).A.decreased piston to cylinder head clearanceB.increased exhaust system back pressureC.early fuel injection timingD.low scavenge air temperature
考题
The desirable properties of a marine fuel oil should include .A.high flash point and high viscosityB.low flash point and high viscosityC.low heating value and high sulphur contentD.high heating value and low sulphur content
考题
单选题Around the combustion chamber, all the main components are to give low thermal strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）A
drill cooledB
hole cooledC
tube cooledD
bore cooled
考题
单选题The desirable properties of a marine fuel oil should include（）A
high flash point and high viscosityB
low flash point and high viscosityC
low heating value and high sulphur contentD
high heating value and low sulphur content
考题
单选题In modern installations, the main engine and the standby auxiliary engines（）A
can be started at low temperature and are free from preheatingB
usually are preheated by steam before being startedC
are kept at a constant temperature and free from preheatingD
are kept at a low temperature to save energy
考题
单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）A
reduce lube oil temperatureB
raise exhaust temperature reduceC
excessive heating of engine roomD
reduce load on cooling water pump
考题
单选题Early injection timing is indicated by （）.A
high exhaust temperature and low firing pressureB
high exhaust temperature and high firing pressureC
low exhaust temperature and low firing pressureD
low exhaust temperature and high firing pressure
考题
单选题The heated feed-water entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamberC
vaporize, with the remaining water a t a temperature greater than it entered the flash chamberD
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
考题
单选题In the combustion chamber, the part whose surface is exposed to the highest temperature is the （）.A
cylinder linerB
cylinder coverC
pistonD
exhaust valve
考题
单选题In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）A
avoid false alarms as a result of condensing water vaporB
avoid danger of frost under very cold weatherC
reduce the viscosity of the crankcase atmosphere in order to improve the fluidityD
keep the temperature of the oil mist detectors in an appropriate range
考题
单选题If the temperature drops low enough, oil will not flow, （） just tell us the temperature.A
Hash pointB
ViscosityC
Pour pointD
Cetane number
考题
单选题If found oil when we open low oil level plug of separator, it indicates （）A
the separator is overloadB
the monitor equipment of separator failsC
the discharge pump of separator can not workD
the temperature of oil water is low
考题
单选题Low cylinder compression pressure and a high exhaust temperature may indicate （）A
early fuel injection timingB
leaking valvesC
a continuously open scavenge air portD
low cooling water temperature
考题
单选题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) onlyC
(2) onlyD
(1),(2) and (3)
考题
单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
low scavenge air temperature
考题
单选题The heated feedwater entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberC
vaporize, with the remaining water at the temperature greater than it entered the flash chamberD
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
考题
单选题The greater the pressure difference between a high and a low pressure center，the（）.A
dryer the air mass will beB
cooler the temperature will beC
greater the force of the wind will beD
warmer the temperature will be
考题
单选题The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.A
sub-cooled liquidB
high temperature liquidC
oil saturated liquidD
superheated vapor
考题
单选题Oily water separator mis-alarms, the most possible reason is （）A
separating oil too fastB
the sensor flushed badlyC
the discharge solenoid value out of orderD
too low heating temperature
考题
单选题The refrigerating agent can （） at low temperature in the evaporator.A
expandB
evaporateC
condenseD
distil
考题
单选题Bad valves operation of the reciprocating air compressors can be detected by observation of （）.A
the discharge temperature lowB
the discharge temperature highC
the discharge pressure riseD
the inter-stage pressure low
考题
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.A
increased pump speedB
excessive pump discharge pressureC
too low of a tilting box angleD
low pump speed
考题
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
考题
单选题Around the combustion chamber, all the main components are bore cooled to give low strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）A
thermalB
mechanicalC
plasticD
elastic
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