更多"Which of the conditions listed woul"的相关试题:
[单项选择]Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）
A. Gravity siphon effect
B. Higher vacuum in the second-stage
C. Difference in brine density between first and second stages
D. lower pressure in first-stage
[单项选择]Which of the listed conditions can cause a diesel engine to use too much lube oil?（）
A. Dirty lube oil filter
B. Too much piston ring wear
C. High lube oil viscosity
D. Low lube oil temperature
[单项选择]Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）
A. High sulphur content fuel
B. High lube oil temperatures
C. High vanadium content fuel
D. Excessive piston slap
[单项选择]Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）
A. Closing of the solenoid valve
B. Closing of the expansion valve
C. An increase in the suction pressure
D. Decreasing the suction pressure
[单项选择]Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）
A. faulty combustion
B. excessive ring temperature
C. over lubrication
D. all of the above
[单项选择]Which of the following would cause a diesel to have black smoke?（）
A. leaky injector
B. water in the gas
C. too heavy oil
D. water in the oil
[单项选择]Which of the listed devices would be installed at a control system air pressure reducing station?（）
A. Moisture separator
B. Vacuum breaker
C. Lubricator
D. Non-return valve
[单项选择]Which of the listed materials would be considered as a bunting class "C" fire?（）
A. Fuel oil
B. Wood
C. Celluloid
D. Electrical insulation
[单项选择]Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）
A. Excessive cylinder liner
B. water in the fuel system
C. Cracked cylinder liner
D. Leaking lube oil cooler
[单项选择]If ignited, which of the listed materials would be a class "B" fire?（）
A. Magnesium
B. Paper
C. Wood
D. Diesel Oil
[单项选择]Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）
A. Plugged injector nozzles
B. Excessive fuel injection
C. Very late injection timing
D. Incorrect crankshaft clearance
[单项选择]Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）
A. Shortage of refrigerant oil
B. Slight shortage of refrigerant
C. Excessive condenser cooling water flow
D. Faulty expansion valve
[单项选择]Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A. Thermal expansion valve frozen open
B. Suction gas heat exchanger bypassed
C. Condenser clogged or fouled
D. High pressure cutout switch inoperative
[单项选择]Which of the following would not cause high suction pressure?（）
A. insufficient refrigeration
B. leaky suction valves
C. expansion valve stuck open
D. suction valve not adjusted properly
[单项选择]Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）
A. The density of the air entering the compressor
B. The temperature of the air entering the compressor
C. The designed rotating speed of the compressor
D. A leaking head gasket
[单项选择]Which of the listed burning materials would be described as a class "B" fire?（）
A. Acetylene
B. Lube oil
C. Grease
D. All of the above
[单项选择]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 point
B. Heating the air to a point at which moisture will boil off ,then re-cooling it
C. Cooling the air to a point below dew point, then reheating it
D. Heating the air and then cooling it to a point below dew point
[单项选择]In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?（）
A. Distiller air ejector cooling medium
B. Saltwater heater discharge
C. First-stage internal feed box
D. Second-stage internal feed box
[单项选择]Moisture in a D-Cmotor would cause （）.
A. short circuit
B. speed up
C. slow down
D. hunting
