更多"Advection fog may be formed by cold"的相关试题:
[单项选择]Fog forms when the air（）.
A. Is 50% water saturated
B. Is 90% water saturated
C. Temperature is greater than the dew point temperature
D. Temperature is equal to，or below the dew point temperature
[单项选择]The fog produced by warm moist air passing over a cold surface is called（）.
A. conduction fog
B. radiation fog
C. frontal fog
D. advection fog
[单项选择]Water fog from an all-purpose nozzle may be used to（）.
A. fight an electrical fire
B. fight a magnesium fire
C. eliminate smoke from a compartment
D. All of the above
[单项选择]Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）
A. refrigerant bubbles in the lube oil
B. refrigerant reducing the lube oil viscosity
C. oxidation of the lube oil from overheating
D. reducing the floc or cloud point of the oil
[单项选择]Cold weather starting of a diesel engine may be made easier by（）
A. decreasing the compression ratio
B. using a special fuel having a high ignition temperature
C. increasing the starting air supply
D. heating the jacket water
[单项选择]A person may operate an air compressor in which of the following areas on board a tank barge?（）
A. Pumproom
B. Generator room
C. A space adjacent to a cargo tank
D. A space two meters from a cargo valve
[单项选择]Sludge may form in the crankcase of an air conditioning compressor as a result of （）.
A. bubbling refrigerant
B. overheating and oxidation
C. lowered operating temperatures
D. reducing the cloud or flash point
[单项选择]As for a diesel engine, lack of combustion air may be due to （）.
A. fouling turbine
B. fuel pump faults
C. lubrication failure
D. excessive cooling
[单项选择]Air that may enter a refrigeration plant tends to collect in the （）.
A. upper part of the receiver
B. upper part of the condenser
C. down stream end of the cooling coil
D. outlet end of the condenser
[单项选择]Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.
A. an auxiliary reservoir
B. a controlling air bottle
C. an emergency air compressor
D. a main air compressor
[单项选择]If the engine does not start on air, it may be due to （）
A. low compression of the fuel pumps
B. incorrect timing of fuel pumps
C. the starting air valves stuck
D. air-locks in fuel oil pipeline
[单项选择]A restricted air intake to a diesel engine may result in the engine （）.
A. failing to reach rated speed
B. knocking under maximum load
C. hunting or surging under light load
D. overspeeding and running away
[单项选择]Which kind of fog is also named as ground fog?（）
A. Advection
B. Radiation fog
C. frontal fog
D. Steam fog
[单项选择]Radiation fog（）.
A. always forms over water
B. is formed by a temperature inversion
C. is thinnest at the surface
D. dissipates during the evening
[单项选择]High-velocity fog（）.
A. is a finer，more diffuse water spray than low-velocity fog
B. requires that the water pressure be no greater than 60 psi
C. produces an effective fog pattern no more than 6 feet beyond the nozzle
D. extinguishes a fire by absorbing heat and reducing the supply of oxygen
[单项选择]Advection fog holds longest over which portions of the lakes? （）
A. Northwest
B. Southeast
C. Northeast
D. Southwest
[单项选择]Which instrument is most useful in forecasting fog（）.
A. A barometer
B. An anemometer
C. A sling psychrometer
D. A pyrometer
