更多"As a high pressure system approache"的相关试题:
[单项选择]When a high pressure system is centered north of your vessel in the Northern Hemisphere（）.
A. You should experience hot，moist，clear weather
B. The wind direction is generally easterly
C. The winds should be from the southwest at your location
D. The winds should be brisk
[单项选择]A barometer showing falling pressure indicates the approach of a（）.
A. high pressure system
B. low pressure system
C. high dew point
D. low dew point
[单项选择]Compared to a low pressure system，generally the air in a high is（）.
A. warmer，less dense，and less stable
B. cool，more dense，and drier
C. muggy and cloudy
D. extremely moist with high relative humidity
[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]The high pressure in fuel injection system of the diesel engine is produced by the （）.
A. injector pump
B. fuel injector
C. governor
D. turbocharger
[单项选择]Low cylinder compression pressure and a high exhaust temperature may indicate （）
A. early fuel injection timing
B. leaking valves
C. a continuously open scavenge air port
D. low cooling water temperature
[单项选择]High pressure and low pressure alarms must be tested（）.
A. no earlier than 24 hours prior to loading
B. no later than 24 hours prior to loading
C. anytime prior to loading
D. weekly
[单项选择]If the head pressure is too high,（）
A. the relief valve should open before the high-pressure cutout
B. the relief valve should open and let excess refrigerant go to receiver
C. the high-pressure cutout switch should operate before the relief valve opens
D. close in on the suction valve
[单项选择]In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.
A. constant
B. pulse
C. high
D. none of the above
[单项选择]The device used for low-pressure control and high-pressure cutout on a compressor is called a（）
A. cutout
B. pressure controller
C. controller switch
D. cutout switch
[单项选择]The greater the pressure difference between a high and a low pressure center，the（）.
A. dryer the air mass will be
B. cooler the temperature will be
C. greater the force of the wind will be
D. warmer the temperature will be
[单项选择]Flexible hose under pressure in a hydraulic system will （）.
A. tend to twist about its long axis
B. expand in length and in diameter
C. contract in length and expand in diameter
D. flex at right angles to the applied pressure
[单项选择]The refrigeration system low pressure cutout switch is actuated by （）.
A. an electric system manager
B. a sensing bulb at the tail coil of the evaporator
C. pressure changes in the suction line
D. failure of the king solenoid valve
[单项选择]Pressure in an operating hydraulic system is developed （）.
A. only by the pump as its primary function
B. by resistance to the fluid flow through the system
C. by the thermal input to the systems fluid
D. solely by the charge applied by the accumulators
[单项选择]The low pressure side of a refrigeration system is considered to exist from the （）.
A. expansion valve to the compressor
B. receiver to the expansion coil
C. expansion valve to the evaporator
D. condenser to the expansion valve
[单项选择]High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）
A. improper fuel rack positing
B. lengthy exhaust valve duration
C. extend operation at light load
D. excessively early injection timing
[单项选择]The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）
A. opposing operational drag
B. pressure distribution
C. differential
D. system purge
[单项选择]Which will cause the high pressure cutout to stop the compressor in a R-22 system?（）
A. Condenser leakage
B. A shortage of liquid refrigerant
C. Excessive frost on the evaporator
D. Not enough condenser cooling water
