更多"In reference to air conditioning, w"的相关试题:
[单项选择]You（）buy some reference books when you go to college.
A. could
B. will have to
C. must to
D. might
[单项选择]When air becomes trapped in the hydraulic fluid of a steering system, the （）.
A. rudder will respond sluggishly
B. hydraulic rams will over-speed
C. sight glass will show bubbles
D. ram relief valves will lift
[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]When air is at its dew point it（）.
A. will contain no additional moisture
B. has the lowest relative humidity
C. cannot keep up its moisture
D. has a low absolute humidity
[单项选择]When air is at its dew point it is at its（）
A. lowest absolute humidity
B. lowest relative humidity
C. highest absolute humidity
D. highest relative humidity
[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]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]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]Fog forms when the air（）.
A. Is 50% water saturated
B. Is 90% water saturated
C. Temperature is greater than the dew point temperature
D. Temperature is equal to，or below the dew point temperature
[单项选择]When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will（）
A. increase in temperature
B. lose its energy partly
C. expand and do work
D. begin to be compressed
[单项选择]A re-heater in an air conditioning system functions to （）.
A. control inlet air temperature
B. control inlet air volume
C. maintain relative humidity at 15%
D. restore conditioned air temperature to a comfortable level
[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]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]When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）
A. an obstruction in an cylinder
B. water accumulation in some engine cylinders
C. low starting air pressure
D. low scavenge air pressure
[单项选择]
When starting air-conditioner in the winter, we should open（）in sequence.
Ⅰ.alve of warming
Ⅱ.alve of humidifier
Ⅲ.an
A. Ⅲ-Ⅱ-Ⅰ
B. Ⅲ-Ⅰ-Ⅱ
C. Ⅰ-Ⅲ-Ⅱ
D. Ⅱ-Ⅲ-Ⅰ
[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
