网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
A compressor should never be stopped （）.
A
without first cooling it
B
without first heating it
C
without first unloading it
D
without first loading it
参考答案
参考解析
解析：
暂无解析
更多 “单选题A compressor should never be stopped （）.A without first cooling itB without first heating itC without first unloading itD without first loading it” 相关考题
考题
As for food, experts suggest that______.A. we should eat lessB. we should never eat meatC. we should have meals with less salt and sugarD. we should have meals without salt or sugar
考题
Teresa's car stopped on the highway.It ( ) out of gas.
A、should runB、should have runC、may runD、may have run
考题
Never______stowed like this．A.optional cargo should beB.should optional cargo beC.should be optional cargoD.optional cargo must be
考题
If the head pressure of a reciprocating refrigeration compressor is excessiveA.the relief valve should open before the high pressure cutoutB.the relief valve should open and allow the excess refrigerant to flow to the receiverC.the high pressure cutout switch should operate before the relief valve opensD.you should close the discharging valve
考题
Manila lines in which the strands are right-hand laid ______.A.should be coiled in a clockwise directionB.should be coiled in a counterclockwise directionC.may be coiled either clockwise or counterclockwiseD.should never be coiled
考题
单选题During working of an air compressor, （） should be drained.A
oil sumpB
oil separatorC
outlet pipeD
inlet pipe
考题
单选题If a refrigeration system compressor crankcase is sweating, you should （）.A
add refrigerant to the systemB
adjust the thermal expansion valve to the proper settingC
adjust the float valve to the proper holding pressureD
open the hand expansion valve
考题
单选题If a refrigeration compressor is short cycling on high head pressure, you should （）.A
purge the condenser if the waterside is dirtyB
check for proper water flow through the condenserC
increase the high pressure cutout settingD
reduce the cooling water flow
考题
单选题The refrigerant gas returning to the compressor should be （）.A
superheatedB
saturatedC
denseD
flooded
考题
单选题If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.A
run continuouslyB
not startC
have high discharge pressureD
short cycle on the high pressure switch
考题
单选题The example of an egg on a skateboard is used to show that _____.A
eggs break easily on a moving skateboardB
cars should not be stopped suddenlyC
seat belts are important to safetyD
driving is a dangerous act
考题
单选题Before charging a refrigeration unit, the refrigerant charging lines should be（）A
flushed with clean refrigerant oilB
purged with the refrigerantC
washed with an ammonia and alcohol solutionD
grounded to compressor
考题
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
考题
单选题Before starting an air compressor, It should be （）.A
turnedB
oil level checkedC
filled with waterD
A and B
考题
单选题Before starting an air compressor, It should be （）.A
unloadedB
primedC
filled with waterD
greased
考题
单选题During working of an air compressor, （） should be drained.A
inter coolerB
cylinderC
outlet pipeD
inlet pipe
考题
单选题It should be ensured that only （） vapor is handled by the refrigeration compressor.A
humidityB
dryC
steamD
oil
考题
单选题If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）A
inspection covers should not be opened until the engine has cooledB
ventilation system should be continued in operation for one hour for coolingC
scavenge pump should be immediately secured to prevent loss of lube oilD
explosion covers should be opened slightly to provide extra ventilation
考题
单选题（）, the following possible causes should be investigated.A
Should the engine stop without apparent reasonB
The engine should stop without apparent reasonC
The engine stops without apparent reasonD
The engine is stopped without apparent reason
考题
单选题Puncture leaks in the lower tubes or bottom of an inflatable liferaft should FIRST be stopped by using（）.A
sealing clampsB
repair tapeC
a tube patchD
sail twine and vulcanizing kit
考题
单选题Air compressor receivers should be “blown down” at least （）.A
yearlyB
quarterlyC
monthlyD
daily
考题
单选题Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）A
changing the air filterB
recharging the systemC
changing compressor lubricantD
renewing container vacuum
热门标签
最新试卷