更多"Some refrigeration systems have che"的相关试题:
[单项选择]All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.
A. angled
B. rounded
C. being angled
D. being rounded
[单项选择]Before the final examination, some students have shown（）of tension. They even have trouble in sleeping.
A. anxiety
B. marks
C. signs
D. remarks
[单项选择]（）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.
A. Large crosshead type；crossheads
B. High speed；the cylinders
C. Large crosshead type；the cylinders
D. Four-stroke；pistons and cylinders
[单项选择]Some of these shoals have been disproved and are not charted. Nevertheless mariners should （）with particular caution in this area.
A. go
B. proceed
C. move
D. remove
[单项选择]Will you have some dessert, Judy?（）
A. No, thank you. I‘m on a diet.
B. Yes, I‘ve had enough.
C. You are so good at making it.
D. Oh, I don‘t mind.
[单项选择]Some of the citizens have been（）medals for bravery.
A. given
B. offered
C. awarded
D. paid
[单项选择]Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）
A. Geographical positions outlining the area of the sector
B. True bearings as observed from the ship toward the light
C. An outline of the area of the sector
D. True bearings as observed from the light toward the ship
[单项选择]Excuse me for breaking in,（）I have some news for you
A. so
B. and
C. but
D. yet
[单项选择] You have some compressed bitmap files in a directory of your Windows 2000 Professional computer. The file compression has reduced their size from 2 MB to 1 MB. You attempt to copy them to a floppy disk, but an error reports that the destination drive is full. How can you copy the bitmap files to a 1.44 MB floppy disk? （）
A. Use a third-party file compression utility to create a compressed archive containing the bitmap files. Copy the compressed archive to the floppy disk.
B. Create an empty compressed folder on the floppy disk， and copy the files to the new folder.
C. Format the floppy disk as NTFS， and restart the copy operation.
D. Confirm that the cluster size on the NTFS volume is greater than 32k.
[单项选择]Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.
A. pressure changes in the air mass
B. movement of the air mass
C. the heterogeneous nature of the air mass
D. upper level atmospheric changes
[单项选择]A refrigeration system contaminated with moisture can be affected by （）.
A. acid formation
B. sludge formation
C. ice in the expansion valve
D. All of the above
[单项选择]Increasing the moisture content of conditioned air is known as （）.
A. moisturizing
B. dehumidification
C. dampening
D. humidification
[单项选择]Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation （）
A. is good for long term preserving since most insulation is organic and contains some amount
B. lowers the insulation value and is a common cause of fault grounds in idle machines
C. will enhance insulation resistance only if it is fresh water and contains no salt
D. reduces the amount of current supplied or drawn by the machine so horsepower is limited
[单项选择]Moisture in the refrigerant may （）.
A. freeze on the expansion valve seat and reduce the flow of liquid refrigerant
B. emulsify the oil in the condenser
C. freeze in the king valve
D. clog the oil trap
[单项选择]Moisture is removed from a refrigeration system by（）.
A. bleeding refrigerant from the condenser
B. opening a drain petcock on the oil separator
C. condensing the water in the heat exchanger
D. using a dehydrator cartridge
[单项选择]The moisture equilibrium chart can be used to determine the（）.
A. Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium exists
B. Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodity
C. Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargo
D. Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo
[单项选择]The process of removing moisture from air is known as（）.
A. humidification
B. dehumidification
C. vaporization
D. evaporation
[单项选择]In an air conditioning system, moisture is removed from the air by（）
A. filers
B. separators
C. ducted traps
D. dehumidifiers
[单项选择]The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the（）.
A. absolute humidity
B. relative humidity
C. specific humidity
D. total humidity
