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
The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.
A
suction
B
compression
C
expansion
D
exhaust
参考答案
参考解析
解析：
暂无解析
更多 “单选题The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.A suctionB compressionC expansionD exhaust” 相关考题
考题
If the suction pressure at the refrigeration compressor is below normal, the cause can beA.refrigerant overchargeB.overfeeding by the expansion valveC.a restricted suction strainerD.due to short cycling of the compress
考题
If the suction pressure for an operating refrigeration compressor is below normal, the cause may be ______.A.an excess of liquid refrigerantB.the expansion valve overfeedingC.a fouled compressor suction strainerD.the compressor short cycling
考题
All diesel engines are classified as ______．A.Four cycleB.Compression ignitionC.Vacuum ignitionD.External combustion
考题
Which of the following uses compression/decompression to increase the memory available for client workloads?（）A、PowerVMB、VMControlC、Active Memory SharingD、Active Memory Expansion
考题
单选题（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）A
Inefficient scavenging；twiceB
Inefficient scavenging；1~8 timesC
Fewer strokes in a circle；twiceD
Fewer strokes in a circle；1~8 times
考题
单选题When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.A
flooding backB
superheatingC
overflowingD
recycling
考题
单选题Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）A
increaseB
decreaseC
remain the sameD
increase on compression decrease on expansion
考题
单选题The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.A
the beginning of the compression strokeB
the beginning of the suction strokeC
the end of the working strokeD
the end of the exhaust stroke
考题
单选题Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）A
Closing of the solenoid valveB
Closing of the expansion valveC
An increase in the suction pressureD
Decreasing the suction pressure
考题
单选题What is the function of thermostatic expansion valve in a compression refrigeration system?（）A
nonexistentB
for controlling pressureC
for controlling superheatD
for controlling the solenoid valve
考题
单选题Thermostatic expansion valve are （）.A
either all the way open or all the way closedB
normally openC
throttled depending on loadD
controlled by suction pressure
考题
单选题In four strokes engine, the cycle of events is completed in four strokes of （）.A
the cylinderB
the crankshaftC
the pistonD
the cross-head
考题
单选题In a four stroke engine, which process lasts the longest period?（）A
exhaust and suction processB
suction and compression processC
combustion and exhaust processD
working and exhaust process
考题
单选题Low compression pressure in a diesel engine is caused by（）A
low water in the expansion tankB
improperly seated valvesC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
考题
单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.A
two crankshaft revolutions in a two-stroke/cycle engineB
two power strokes in a two-stroke/cycle engineC
one power stroke in a two-stroke/cycle engineD
two piston strokes in a two-stroke/cycle engine
考题
单选题If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.A
refrigerant overchargeB
overfeeding by the expansion valveC
a restricted suction strainerD
due to short cycling of the compressor
考题
单选题The working cycle of a four-stroke diesel engine consists of four events:（） (1) compression (2) expansion (3) exhaust (4) suctionThe correct sequence isA
(4)-(2)-(3)-(1)B
(4)-(3)-(1)-(2)C
(4)-(3)-(2)-(1)D
(4)-(1)-(2)-(3)
考题
单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
has a lower effective compression ratioC
operates with scavenge air under a positive pressureD
operates without energy absorbing intake and exhaust strokes
考题
单选题（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.A
At the beginning of the compression strokeB
At the beginning of the suction strokeC
At the end of the working strokeD
At the end of the exhaust stroke
考题
单选题The four-stroke cycle is so called because it takes （） to complete the processes needed to convert the energy in the fuel into work.A
two strokes of the pistonB
four strokes of the pistonC
one revolution of the crankshaftD
four revolutions of the crankshaft
考题
单选题It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.A
the suction strokeB
the compression strokeC
the expansion strokeD
the exhaust stroke
考题
单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）A
a two-stroke engine works without exhaust operationB
a two-stroke engine works without compression strokeC
a two-stroke engine works without expansion strokeD
a two-stroke engine works without suction operation
考题
单选题In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.A
by an fuel valveB
through an inlet valveC
with an exhaust valveD
from an outlet valve
考题
单选题Four strokes consist of suction, compression, （） and exhaust stroke.A
combustionB
condensationC
chargingD
evaporation
考题
单选题A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.A
condition of the expansion valveB
moisture in the systemC
condition of the compressor suction valvesD
condenser temperature
考题
单选题Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.A
carbon deposits on the compressor suction valvesB
the evaporator temperature to increaseC
rapid corrosion of the thermal expansion valveD
no operating problems
考题
单选题A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.A
crankshaft revolutionB
mechanical cycle of operationC
period of two combustion cyclesD
cycle of two events
热门标签
最新试卷
