with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve
upright, sensing temperature of the box, and upstream of the thermal expansion valve
upright, sensing temperature of the box, and downstream of the thermal expansion valve
upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
第1题:
The refrigeration system low pressure cutout switch is actuated by______.
A.an electric system manager
B.a sensing bulb at the tail coil of the evaporator
C.pressure changes in the suction line
D.failure of the king solenoid valve
第2题:
an electric system manager
a sensing bulb at the tail coil of the evaporator
pressure changes in the suction line
failure of the king solenoid valve
第3题:
If the head pressure of a reciprocating refrigeration compressor is excessive
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 the discharging valve
第4题:
Special tools are required for lapping or grinding
It is impossible to throttle flow with a butterfly valve
To close the valve, it is only necessary to turn the handle a quarter of a turn
The butterfly valve should never be used in a freshwater system
第5题:
add refrigerant to the system
adjust the thermal expansion valve to the proper setting
adjust the float valve to the proper holding pressure
open the hand expansion valve
第6题:
材料:
At 1800,the hydraulic steering system failed once again.The master realized he would require shore assistance to rectify the problem,and diverted towards Portland using the thruster to steer by.The weather at this time was south-south-west force 5.At about three hours later,the thruster drive unit failed due to a leaking fuel injector pipe on the power unit.This was replaced using the spare carried on board.Immediately following the engine restart,an adjacent fuel line failed causing shut down of the unit.With no fuel line spares available,the thruster power unit could not be used.The failure of this unit,and that of the main hydraulic steering system,left the vessel without any steering capability.
At 2155,with the weather deteriorating and no steering,the master contacted the Portland Coastguard and a“Pan pan”message was broadcast.A tow to Portland Harbor was arranged and she arrived alongside at 0240 the following morning.The subsequent investigation found that the main hydraulic steering system failure was due to a seized shuttle valve in the main hydraulic solenoid valve block.The solenoid valve had been recently overhauled.It was thought that the“O”rings fitted to the shuttle valve were of either the wrong type or a defective one.The valve had seized in such a position that hydraulic pressure by-passed the system preventing use of the hand steering.
问题:
The vessel was steered by thruster because ________ failed.
A.the hydraulic steering system
B.the solenoid valve
C.the thruster driving unit
D.the hand steering
The time that the thruster drive unit failed was ________ hrs.A.1800
B.2100
C.2155
D.0240
When the hydraulic steering system failed,________.A.the hand steering system could still be used
B.the auto steering system could still be used
C.both hand and auto steering system were out of use
D.neither and steering system nor auto steering system was out of use
The real reason that caused the hydraulic steering system to fail was that ________.A.no fuel line spare were available
B.the weather was deteriorating
C.the“O”rings fitted to the shuttle valve were of either the wrong type or a defective one
D.the thruster power unit failed
请帮忙给出每个问题的正确答案和分析,谢谢!
第7题:
fuel supply valve should be closed
hatches,doors,and oar ports should be closed
air cylinder shut-off valve should be closed
engine should be shut off
第8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9题:
dehydrated
purged
plugged
evacuated
第10题:
separating chamber
system of baffles
purge valve
vacuum reducing valve