單項選擇題Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()

A.Sub-cooled liquid
B.Sub-cooled vapor
C.Superheated vapor
D.Liquid


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1.單項選擇題Flame failure in an automatically fired auxiliary boiler can from a/an ()

A.incorrect electrode setting
B.incorrect nozzle position
C.clogged fuel nozzle
D.broken high tension lead

2.單項選擇題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

3.單項選擇題Diesel engine air start system check valves are opened by ()

A.an air start cam
B.cylinder compression pressure
C.starting air pressure
D.valve springs

4.單項選擇題The cetane rating of diesel fuel is an indication of the ()

A.ignition quality of the fuel
B.calorific value of the fuel
C.flash point of the fuel
D.rate of fuel consumption

5.單項選擇題The condensers located in various stages of a flash evaporator are cooled by()

A.distillate
B.seawater
C.brine
D.air