If the suction pressure for an operating refrigeration compressor is below normal, the cause may be ______.
A.an excess of liquid refrigerant
B.the expansion valve overfeeding
C.a fouled compressor suction strainer
D.the compressor short cycling
第1题:
Sweating of the refrigeration system compressor crankcase is caused by_______ .
A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor
第2题:
An increase in the heat load to a refrigeration system will cause ______.
A.the suction pressure to decrease
B.the suction temperature to increase
C.increased ice formation on the evaporator coil
D.excessive short cycling of the compressor
第3题:
flooding back
superheating
overflowing
recycling
第4题:
Closing of the solenoid valve
Closing of the expansion valve
An increase in the suction pressure
Decreasing the suction pressure
第5题:
passing it through the expansion valve
condensing refrigerant in the system condenser
passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor
maintaining a high pressure on the systems receiver
第6题:
the relief valve should open before the high pressure cutout
the relief valve should open and allow the excess refrigerant to flow to the receiver
the high pressure cutout switch should operate before the relief valve opens
you should close in on the suction valve
第7题:
refrigerant overcharge
overfeeding by the expansion valve
a restricted suction strainer
due to short cycling of the compressor
第8题:
protect the compressor from liquid flood back
protect the compressor from low discharge pressure
start and stop the compressor upon system demand
start the compressor after a drop in the evaporator pressure
第9题:
liquid
dry saturated gas
wet saturated gas
superheated vapor
第10题:
too much superheat
insufficient superheat
suction pressure too low
excessive refrigerant returning to the compressor
第11题:
has continuously for a long period
suction pressure is below normal
oil level is below normal
starts after a long idle period
第12题:
carbon deposits on the compressor suction valves
the evaporator temperature to increase
rapid corrosion of the thermal expansion valve
no operating problems
第13题:
The sensing line for the low pressure cutout switch to a refrigeration system is located ______.
A.in the chill box(冰箱)
B.before the receiver
C.on the suction side of the compressor
D.on the discharge side of the compressor
第14题:
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
第15题:
the compressor suction pressure is not too high
all air is purged from the pump and charging fittings
the high pressure cutout switch is held open to prevent accidental starting
the condenser is completely shutdown first
第16题:
high discharge pressure
frosting of the crankcase
high temperature of the overboard water
low suction pressure of compressor
第17题:
the compressor short cycling on high pressure cut out switch
high suction pressure
high head pressure
bubbles in the sight glass
第18题:
refrigerant boiling out of solution from the lube oil
liquid refrigerant flooding the compressor and system
lube oil viscosity being reduced by refrigerant dilution
compressor suction pressure suddenly increasing
第19题:
oil foaming in the compressor
higher than normal suction and discharge pressures with a higher box temperature
higher than normal discharge pressure with a normal box temperature
the compressor to run continuously
第20题:
the suction pressure to decrease
the suction temperature to increase
increased ice formation on the evaporator coil
excessive short cycling of the compressor
第21题:
in the chill box
before the receiver
on the suction side of the compressor
on the discharge side of the compressor
第22题:
maintain liquid refrigerant at the suction of the compressor
maintain a preset suction pressure to the compressor
start and stop the compressor at preset operating pressures
operate at minimum efficiency
第23题:
loose expansion valve control bulb
low differential setting on the H-Pcutout
blown fuse in the motor circuit
faulty suction pressure regulator