單項(xiàng)選擇題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 chamber
B.vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber
C.vaporize, with the remaining water at the temperature greater than it entered the flash chamber
D.boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber


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1.單項(xiàng)選擇題In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）

A.The solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloaded
B.The solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be opened
C.When the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unload
D.The solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder

2.單項(xiàng)選擇題The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell （）

A.pressure does not fluctuate rapidly
B.pressure remains steady and unchanged
C.brine density does not exceed 1~5
D.brine density is too low

3.單項(xiàng)選擇題In most pumps and pump motors overpacking the ball bearings full of grease will result in （）

A.moisture emulsification of the bearing grease
B.insufficient circulation and overheating of the bearing
C.proper grease circulation to cool the bearing
D.sliding friction between balls and races

4.單項(xiàng)選擇題Aqueous Film Forming Foam (AFFF), commonly known as ‘light water’, is especially suitable for fighting （）

A.oil fires in the engine room bilges
B.class B fires in paint lockers
C.any class D fire
D.all of the above

5.單項(xiàng)選擇題Which of the following statements concerning the water tube and fire tube boilers is not true?（）

A.natural circulation of the water in the water tube boiler is better than that in the fire tube boiler
B.for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler
C.the water tube boiler will cost shorter time for steam raising
D.the water tube boiler require lower skill in operating and maintaining