If a refrigeration compressor will not start, the reason may be （）.

A . the relief valve should open before the high pressure cutout B . the relief valve should open and allow the excess refrigerant to flow to the receiver C . the high pressure cutout switch should operate before the relief valve opens D . you should close in on the suction valve

A . box temperature solenoid valve will close B . expansion valve will close C . compressor will shutdown D . king valve will ope

A . increase the amount of cooling water to the condenser B . decrease the amount of cooling water to the condenser C . add more refrigerant to the system D . remove some refrigerant from the system

A . the compressor short cycling on high pressure cut out switch B . high suction pressure C . high head pressure D . bubbles in the sight gla

A . higher boiling temperature for a given pressure than does a pure refrigerant B . lower boiling temperature for a given pressure than does a pure refrigerant C . boiling pressure equal to that of a pure refrigerant at a given pressure D . boiling point will not be affected by entrained oil

A . flushed with clean refrigerant oil B . purged with the refrigerant C . washed with an ammonia and alcohol solution D . grounded to compressor

A . compressor B . condenser C . receiver D . evaporator

A . system was overcharged with refrigerant B . high pressure switch was improperly adjusted C . expansion valve strainers were fouled D . suction valves were leaking slightly

A . purge the condenser if the waterside is dirty B . check for proper water flow through the condenser C . increase the high pressure cutout setting D . reduce the cooling water flow

A . high discharge pressure B . frosting of the crankcase C . high temperature of the overboard water D . low suction pressure of compressor

A . a shortage of refrigerant B . the compressor running continuously C . liquid refrigerant returning to the compressor D . the compressor short cycling on the high pressure cutout

A . Sub-cooled liquid B . Sub-cooled vapor C . Superheated vapor D . Liquid

A . increase the flow of the cooling water through the condenser B . adjust the high pressure cutout to maintain the desired pressure C . open the hot gas bypass temporarily to reduce capacity D . purge non-condensable gases to reduce the excess pressure

A . Proper refrigerant charge B . Faulty expansion valve C . Insufficient refrigerant D . Solenoid valve stuck ope

A . refrigerant overcharge B . overfeeding by the expansion valve C . a restricted suction strainer D . due to short cycling of the compressor

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

A . excessive condenser cooling water B . warm food in the refrigerator C . a shortage of refrigerant D . s shortage of compressor oil

A . be clear B . be blue C . be light green D . show bubble

A . rub the eyes B . irritate the eyes C . wash the eyes with a heavy boric acid solution D . obtain medical hel

A . too much refrigerant in the system B . oil entrained in the refrigerant C . less than a full charge of refrigerant in the system D . ice crystals forming in the refrigerant

A . system was overcharged with refrigerant B . system was low on refrigerant C . suction valves were leaking slightly D . relief valve was leaking slightly

A . stored at temperatures below 60 degrees Fahrenheit B . charged into a system having copper fittings C . allowed to mix with compressor oil D . exposed to an open flame or hot surface

A . high pressure liquid B . low pressure vapor C . high pressure vapor D . low pressure liquid

A.go by B.go off C.go on D.go back