更多"Exhaust gases are generally removed"的相关试题:
[单项选择]In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.
A. water-tube
B. fire-tube
C. exhaust gas
D. None of the above is true
[单项选择]Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.
A. air cooler
B. economizer
C. injector
D. air blower
[单项选择]Moisture is removed from a refrigeration system by（）.
A. bleeding refrigerant from the condenser
B. opening a drain petcock on the oil separator
C. condensing the water in the heat exchanger
D. using a dehydrator cartridge
[单项选择]The heat removed from the refrigerant in the condenser of a refrigeration plant is the （）
A. latent heat of expansion
B. sensible heat of condensation
C. heat of compression
D. all of the above
[单项选择]Air or noncondensable gas is removed from a refrigeration system by a （）
A. separating chamber
B. system of baffles
C. purge valve
D. vacuum reducing valve
[单项选择]Which of the following statements concerning cylinder liner wear is true?（）
A. Liner wear is distributed equally between the upper and lower portions of the cylinder
B. Excessive liner wear causes wear between piston ring and groove
C. Excessive, but uniform liner wear will not cause wear between piston ring and groove
D. Liner wear is normally greatest in the middle of the cylinder
[单项选择]A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A. a leaking fuel injector nozzle
B. a clogged air filter
C. excessively early fuel injection
D. malfunctioning valves
[单项选择]Before a marine diesel engine is started the cylinders and pistons must be （）.
A. cooled to appropriate temperature
B. warmed up gradually to appropriate temperature
C. opened up and renewed
D. ground and polished
[单项选择]Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）
A. injection pressure
B. shape of combustion space
C. turbulence in combustion space
D. all of the above
[单项选择]What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
A. Spark plug
B. Heat of compression
C. Carburetor
D. Glow plug
[单项选择]Blow-off of the relief valves of the engines cylinders may be caused by （）.
A. too low lead
B. water in fuel
C. too tight spring
D. leakage
[单项选择]On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.
A. splash method
B. mechanical force feed lubricators
C. detached sump method
D. internal cooling passages in the crankshafts and connecting rods
[单项选择]A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases? （）
A. In the lower level of the pumproom
B. In the middle level of the pumproom
C. In the upper level of the pumproom
D. On the deck outside the pumproom
[单项选择]Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）
A. Carbon dioxide
B. Carbon monoxide
C. Carbon trioxide
D. Hydrogen sulfide
[单项选择]The two most common gases used in pneumatic system are （）
A. compressed air and nitrogen
B. helium and nitrogen
C. oxygen and hydrogen
D. oxygen and acetylene
[单项选择]The process to remove exhaust gases by blowing in fresh air is called （）.
A. charging
B. supercharging
C. starting
D. scavenging
