更多"The passing of a low pressure syste"的相关试题:
[单项选择]In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
A. broken valve springs
B. tight drive belts
C. high line voltage
D. air in the system
[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]The purpose of the refrigeration system low pressure cutout switch is to （）
A. protect the compressor from liquid flood back
B. protect the compressor from low discharge pressure
C. start and stop the compressor upon system demand
D. start the compressor after a drop in the evaporator pressure
[单项选择]In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）
A. be clear
B. be blue
C. be light green
D. show bubbles
[单项选择]By using（）system a ship can send a distress message and know with certainty it will be received.
A. COSPAS-SARSAT
B. SATELLITE
C. terrestrial radio
D. INMARSAT
[单项选择]In an alternating current electrical system, a low system power factor is a direct sign of （）
A. wasted energy
B. efficient operation
C. a short in the exciter field windings
D. an excessive number of minor system grounds
[单项选择]Which of the following is more important in determining the amount of free surface that will be produced?（）.
A. Outside temperature
B. Dewpoint of the outside air
C. Dewpoint of the air in the cargo hold
D. Temperature of the cargp
[单项选择]Floating, not controlled, without a clearly determinable direction means（）.
A. grounding
B. sailing
C. adrift
D. running into danger
[单项选择]A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.
A. high pressure liquid line
B. low pressure liquid line
C. high pressure vapor line
D. low pressure vapor line
[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]The interaction of these seven elements is（）determines the outcome in any instance of speech communication.
A. what
B. that
C. how
D. which
[单项选择]（）process the distress signal from EPIRB to determine its position and identity.
A. COSPAS-SARSAT
B. Ground receiving stations
C. storing distress signal
D. Near-polar orbiting satellites
[单项选择]FLOATING，CAUSED BY WINDS AND CURRENT WITH A DETERMINABLE DIRECTION defines（）.
A. Floating
B. Sailing
C. Drifting
D. Running into danger
[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]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]You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
A. Your speed must be reduced to bare steerageway
B. A look-out is not required if the radar is on
C. Fog signals are only required when a vessel is detected by radar
D. The radar should always be kept on a short-range scale
