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单选题
The piston cooling system may employ similar components, except that a drain tank is used instead of a head tank That means this system （）.
A
doesnt use a drain tank but a head tank
B
uses a drain tank not head tank
C
uses a drain tank and a head tank
D
uses neither a drain tank nor a head tank
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更多 “单选题The piston cooling system may employ similar components, except that a drain tank is used instead of a head tank That means this system （）.A doesnt use a drain tank but a head tankB uses a drain tank not head tankC uses a drain tank and a head tankD uses neither a drain tank nor a head tank” 相关考题
考题
Which two statements are true about the use of the procedures listed in the vsysaux_occupants.move_procedure column?()
A. The procedure may be used for some components to relocate component data to the SYSAUX tablespace from its current tablespace.B. The procedure may be used for some components to relocate component data from the SYSAUX tablespace to another tablespace.C. All the components may be moved into SYSAUX tablespace.D. All the components may be moved from the SYSAUX tablespace.
考题
High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).A.decreased piston to cylinder head clearanceB.increased exhaust system back pressureC.early fuel injection timingD.low scavenge air temperature
考题
Piston cooling fins are locatedA.atop the piston crownB.beneath the piston crownC.at the base of the piston skirtD.inside the cylinder liner cooling water jacket
考题
Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system
考题
Why is it necessary to have routine testing of the cooling water?A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all timeB.To trace leakage in the cooling water systemC.It is not necessaryD.To detect the presence of contaminants in the water that may be injurious to the cooling system
考题
Which of the following components provides for the BEST hardware cooling features？（）A、 Epoxy pasteB、 Chip fanC、 Heat sinkD、 Virtualization
考题
A customer wants to install a pSeries system into an OEM rack. What critical information is provided in the Site and Hardware Planning Information manual？（）A、System dimensions and weight， system power and cooling requirements， and list of supported OEM racksB、System dimensions and weight， list of supported OEM racks， and requirements for installing IBM systems into OEM racksC、System performance specs， system power and cooling requirements， and requirements for installing IBM systems into OEM racksD、System dimensions and weight， system power and cooling requirements， and requirements for installingIBM systems into OEM racks
考题
Which of the following accurately describes the meaning of redundant cooling？（）A、The source of cooling to a RAID systemB、The cooling system in a redundant power supplyC、A cooling system that can be installed in case of failureD、A second cooling system in case of a failure
考题
单选题Low compressor head pressure in a refrigeration system can be caused by（）.A
insufficient condenser cooling waterB
excessive condenser cooling waterC
air in the refrigeration systemD
excessive refrigerant in the system
考题
单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）A
a low level in the engine expansion tankB
excessively high coolant pressureC
improper temperaturesD
malfunctioning of the jacket water heater
考题
单选题Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A
low compression pressureB
increased piston wearC
increased cylinder lube oil consumptionD
poor contact between compression rings and liner
考题
单选题The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）A
water coolingB
oil coolingC
air coolingD
combined cooling
考题
单选题Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.A
cylinder liners and piston ringsB
main bearingsC
crankpin bearingsD
turboblower
考题
单选题There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.A
recirculatingB
total lossC
coolingD
refrigeration
考题
单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
improper venting of the cooling systemB
carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
an incorrectly set cooling system temperature control
考题
单选题（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.A
Diesel oilB
Hydraulic oilC
Lube oilD
Mineral oil
考题
单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
low scavenge air temperature
考题
单选题Which of the following accurately describes the meaning of redundant cooling？（）A
The source of cooling to a RAID systemB
The cooling system in a redundant power supplyC
A cooling system that can be installed in case of failureD
A second cooling system in case of a failure
考题
单选题As to the piston cooling, of the following, which statement is not true?（）A
Because the piston is exposed to very high temperature, it must be cooledB
The lower the piston cooling temperature is, the better it isC
Both water and lube oil can be used as coolantD
One of the piston cooling methods is vibration cooling, with better effect
考题
单选题A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.A
between；toB
either；orC
from；toD
neither；nor
考题
单选题As an alternative to the conventional seawater cooling system, is based on principles about cooler locations, （）flow control and preheating, but with a central cooler and one additional set of pumps（）.A
the central cooling system, differentB
the central cooling system, the sameC
the open cooling system, differentD
the open cooling system, the same
考题
单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
excessive piston cooling
考题
单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.A
loss of suction in the circulating pumpB
leak in the primary cooling systemC
broken raw water pump shaftD
burned or cracked piston in one cylinder
考题
单选题Lube oil in the fresh water cooling system of a diesel engine may result from a （）A
camshaft seizureB
lube oil pump failureC
lube oil cooler failureD
lube oil pump overflow
考题
单选题The piston cooling system may employ similar components, except that （） is used instead of a head tank.A
a sump tankB
a feed wellC
a double bottom tankD
a drain tank
考题
单选题Diesel engine piston seizure can be caused by （）A
poor cooling of cylinder wallsB
improper cooling of the pistonC
insufficient piston lubricationD
all of the above
考题
单选题Piston cooling fins are located（）A
atop the piston crownB
beneath the piston crownC
at the base of the piston skirtD
inside the cylinder liner cooling water jacket
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