更多"The refrigerating agent can （） at l"的相关试题:
[单项选择]Which fire extinguishing agent can NOT be used on an ethylenediamine?（）
A. Water foam
B. Dry chemical powder
C. Water fog
D. Alcohol foam
[单项选择]If the temperature drops low enough, oil will not flow, （） just tell us the temperature.
A. Hash point
B. Viscosity
C. Pour point
D. Cetane number
[单项选择]处于休眠模式的舒适CAN的CAN-Low的电压是多少？（）
A. 0V
B. 5V
C. 10V
D. 12V
[单项选择]Low compression pressure in a diesel engine can be caused by（）
A. improperly seating intake valves
B. leaking cylinder liner seal rings
C. late fuel injection timing
D. carbon deposits on the piston
[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]The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the （）.
A. condenser
B. vapor generator
C. accumulator
D. evaporator
[单项选择]The certificate for the refrigerating plant will（）soonI’d like to extend its validation now.
A. update
B. finish
C. outdated
D. expire
[单项选择]The passing of a low pressure system can be determined by periodically checking the（）.
A. Thermometer
B. Hygrometer
C. Barometer
D. Anemometer
[单项选择]Low compression in a diesel engine can be caused by （）
A. clogged coolant passages
B. a leaking cylinder head gasket
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[单项选择]The (auto)ignition temperature is that temperature atwhich（）.
A. no spark or flame is required to ignite gas or vapor
B. a fuel begins to give off explosive vapors
C. a fuel if ignited will continue to burn
D. a 1% mixture of the fuel with air will explode
[单项选择]The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A. Cross
B. Parallel
C. Counter
D. Circular
[单项选择]Ambient temperature is the （）.
A. amount of temperature rise with no load
B. temperature of the compartment where the motor is located
C. normal operating temperature, less the room temperature
D. amount of temperature developed by an operating motor
[单项选择]High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.
A. engine overload
B. low combustion temperature
C. plugged fuel nozzle holes
D. excessive compression pressure
[单项选择]To determine the pressure and temperature limitations under which LFG is required to be transported on a barge，you should look at the（）.
A. Certificate of Inspection
B. loading order
C. rules and regulations for tankers
D. tankerman's document
[单项选择]In the refrigeration compressor the temperature of the vapor is （） by compression.
A. raised
B. risen
C. reduced
D. maintained constant
[单项选择]The dew point temperature is（）.
A. always higher than the air temperature
B. always lower than the air temperature
C. equal to the difference between the wet and dry bulb temperatures
D. the temperature at which the air is saturated with water vapor
[单项选择]The rising of the exhaust temperature in manifold pipe may NOT result from （）.
A. too great a loading
B. fouled turbocharger
C. bad combustion
D. excessive air
[单项选择]
The effective temperature of air is dependent upon（）
Ⅰ.relative humidity
Ⅱ.air velocity
A. Ⅰonly
B. Ⅱonly
C. Both Ⅰand Ⅱ
D. NeitherⅠnor Ⅱ
[单项选择]If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）
A. cavitation erosion in the water jackets
B. excess corrosion inhibitor in the coolant
C. dirty jacket water cooler
D. defective turbocharger
