更多"In low latitudes，a first quarter Mo"的相关试题:
[简答题]离线LOW-E与在线LOW-E的优缺点？
[单项选择]low flow sensor位于（）
A. 主电子设备舱
B. 驾驶舱
C. 前电子设备舱
D. 空调舱
[简答题]中空LOW-E玻璃可否做弯钢？如果能够做有没有限制？双片夹胶玻璃可否做LOW-E？
[单项选择]Other than the Sun and Moon，the brightest object in the sky is（）.
A. Sirius
B. Canopus
C. Venus
D. Jupiter
[单项选择]The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.
A. evaporation is accomplished in a vacuum
B. due to the higher temperature of the incoming feed
C. due to the latent heat of evaporation principle
D. evaporation in a submerged medium produces more distillate
[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]Low compression results from （）.
A. a worn cylinder
B. broken piston rings
C. either A or B
D. none of the above
[单项选择]Current measuring instruments must always be connected in （）
A. series with a circuit
B. parallel with a circuit
C. series-parallel with a circuit
D. delta with the shunt
[单项选择]Which of the following statements regarding low expansion foam and its application is INCORRECT?（）.
A. Foam should not be used on electrical fires
B. One kilo of low expansion foam solution produces much more foam
C. Foam is only efficient when it covers the top of burning combustibles
D. A stream of foam should be deflected off the deck in order to best agitate the fire
[单项选择]Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.
A. the power stroke
B. the compression stroke
C. low load operation only
D. periods of standby
[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]Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.
A. leaky discharge valves on the LP cylinder
B. leaky discharge valves on the HP cylinder
C. insufficient intercooler cooling
D. low ambient air pressure
[单项选择]High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature
[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]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 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]Low compressor head pressure in a refrigeration system can be caused by（）.
A. insufficient condenser cooling water
B. excessive condenser cooling water
C. air in the refrigeration system
D. excessive refrigerant in the system
