更多"A re-heater in an air conditioning "的相关试题:
[单项选择]In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.
A. superheated
B. saturated
C. condensed
D. convected
[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]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]A re-heater, as used in an air conditioning system, is designed to control the （）
A. chilled water temperature
B. dew point temperature
C. primary air temperature
D. dry bulb temperature
[单项选择]Air conditioning is the process of treating air to control （） its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.
A. instantaneous
B. instantaneously
C. simultaneous
D. simultaneously
[单项选择]The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）
A. manifold
B. condenser
C. chamber
D. plenum
[单项选择]With ducted air conditioning systems, the modern tendency is to use（）
A. central air conditioning system
B. high velocity system
C. low velocity system
D. single duct system
[单项选择]Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
A. catch plates
B. dampers
C. regulating valves
D. fans
[单项选择]In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A. increasing refrigerant pressure in the coil
B. increasing chilled water flow through the cooler
C. sub-cooling the refrigerant in the condenser
D. superheating the refrigerant in the compressor
[单项选择]Air entering an air-cooled refrigeration system is indicated by （）.
A. frosting of the liquid line
B. higher than normal head pressure
C. a clear sight glass
D. abnormally cold reefer boxes
[单项选择]What is the function of an air receiver in the compressed air system on a ship? （）
A. Condenses moisture
B. Provides overpressure protection
C. Purifies the air
D. Acts as an accumulator
[单项选择]What is NOT a function of the air supply of a covered lifeboat?（）
A. Provides air for engine combustion
B. Pressurizes water spray system
C. Provides air for passenger respiration
D. Prevents smoke and other noxious fumes from entering craft
[单项选择]Air compressors are equipped with unloading systems for the purpose of（）.
A. removing all but the frictional load during starting
B. relieving intercoolers of high temperature buildups
C. providing high starting torque in the drive motor
D. seating valve plates during compressor shutdown
[单项选择]The unloading system on an air compressor will （）.
A. increase compressor discharge pressure on demand
B. increase compressor operating speed as necessary
C. allow the motor to turn the compressor opposed only by friction
D. reduce the compressor frictional load when starting
[单项选择]When operating the air supply system in a covered lifeboat the（）.
A. fuel supply valve should be closed
B. hatches，doors，and oar ports should be closed
C. air cylinder shut-off valve should be closed
D. engine should be shut off
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
[单项选择]Purging air from a hydraulic system is necessary when（）
A. adding small amounts of oil to the system
B. the system has been overheated
C. the system has been drained and then filled with new oil
D. the system has been idle for a long period of time
[单项选择]The main function of the lubrication system in to enable （） of a film of oil between the moving parts.
A. the information
B. the formation
C. the scatter
D. the friction
