solenoid valve
low pressure cutout switch
king valve
thermal expansion valve
第1题：
______is a precaution which contributes to avoiding trouble under normal operating conditions.
A.Constant inspection
B.Keeping constant load
C.Remaining constant temperature
D.Varying speed
第2题：
出口横径(transverse outlet，TO)
第3题：
The expansion valve used in a refrigeration system regulates the
A.superheat of the gas leaving the compressor
B.back pressure in the evaporator
C.temperature in the refrigerated space
D.degree of superheat of the gas leaving the evaporator
第4题：
evaporator
compressor
condenser
none of the above
第5题：
refrigerant must be bled off the sensing line before adjustments are made
all refrigerant must be pumped into the receiver before adjustments are made
time must be allowed for conditions to stabilize in the evaporator before further adjustments are made
all refrigerant must be routed through the dehydrator while changing the superheat setting
第6题：
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.
A.entirely constant pressure
B.entirely constant temperature
C.a combination of constant volume and constant pressure
D.a combination of constant temperature and constant pressure
第7题：
Overflow valve
Reducing valve
Balancing valve
Reducing valve or balancing valve
第8题：
A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/an
A.evaporator pressure decrease
B.evaporator coil over-feed
C.evaporator capacity increase
D.expansion valve diaphragm rupture
第9题：
a separate air ejector unit
a direct unimpeded connection between second stage and salt water feed heater
either by vacuum drag or an external line from the first stage via a fixed orifice
the fixed orifice provided in the steam supply line
第10题：
lower condensing
higher cooling
lower cooling
higher condensing