更多"Which of the listed problems would "的相关试题:
[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 problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）
A. Proper refrigerant charge
B. Faulty expansion valve
C. Insufficient refrigerant
D. Solenoid valve stuck open
[单项选择]Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）
A. Lube oil passing through the system
B. Moisture or foreign matter collecting at the valve seat and orifice
C. Variable spring tension caused by the changing temperature
D. Frost on the liquid line
[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 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]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 would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）
A. Improper fuel rack positioning
B. Lengthy opening of the exhaust valve
C. Excessively early injection timing
D. Extended light load operation
[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]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
A. Pressure-reducing valve
B. Unloading valve
C. Counterbalance valve
D. Pressure-relief valve
[单项选择]Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）
A. Carbon build up in the piston ring belt
B. Faulty operation of a cylinder un-loader
C. Compressor operation in an area of high relative humidity
D. Lifting of intercooler rebel valve
[单项选择]Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）
A. Production of high salinity distillate
B. Seawater feed temperature below 165℃
C. A leak in the first stage demister
D. A cracked distillate pump vent line
[单项选择]Which of the listed classes of fire would most likely occur in the engine room of a vessel?（）
A. Classes A and B
B. Classes B and C
C. Classes C and D
D. Classes A and D
[单项选择]Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）
A. clogged air filter
B. compression stroke
C. burned exhaust valves
D. all of the above
[单项选择]Which would influence a magnetic compass（）.
A. Electrical wiring
B. Iron pipe
C. Radio
D. All of the above
[单项选择]Which would you NOT use to report the amount of anchor chain out? Three shots（）.
A. at the water's edge
B. on deck
C. on the bottom
D. well in the water
[单项选择]Based on your 2209 fix，which would be a warning that you are being set down on Block Island Sound South Entrance Obstruction Lighted BIS Buoy? （）
A. Decreasing loran readings on 9960-W
B. Visual bearings of Montauk Point Lt. changing to the left
C. Increasing bearings of Southeast Point Light
D. Decreasing soundings
