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
Overspeed of the diesel engine driving an electric generator could cause().
A
low voltage trip
B
reverse power trip
C
damage to windings
D
excessive exhaust temperatures
参考答案
参考解析
解析:
暂无解析
更多 “单选题Overspeed of the diesel engine driving an electric generator could cause().A low voltage tripB reverse power tripC damage to windingsD excessive exhaust temperatures” 相关考题
考题
Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to _____________.A.higher speed requiredB.flywheel-effectC.lower starting temperaturesD.higher compression pressures
考题
Overspeed of the diesel engine driving an electric generator could cause ______.A.low voltage tripB.reverse power tripC.damage to windingsD.excessive exhaust temperatures
考题
For most diesel propulsion and generator engines, the over-speed trip device will stop the engine byA.moving the governor control to stopB.shutting off the lubricating oil supplyC.tripping the governor emergency stop leverD.shutting off the fuel supply
考题
Sudden unloading of a diesel engine can cause ______.A.Decreased fuel efficiencyB.Increased exhaust temperatureC.Black smokeD.Overspeed trip
考题
单选题The marine diesel engine is a type of diesel engine used on ships The () of its operation is not very difficult to understand.A
principleB
principalC
causeD
case
考题
单选题A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPMWhat is the speed reduction ratio?()A
030 to 1B
300 to 1C
333 to 1D
330 to 1
考题
单选题If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be ()A
excessive compression pressureB
air in the fuel linesC
high fuel pressureD
excessive load
考题
单选题The purpose of DC generator brushes is to ().A
neutralize armature reactionB
conduct electric current to an outside circuitC
convert DC current to AC currentD
provide excitation to a DC generator
考题
单选题For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by ()A
moving the governor control to stopB
shutting off the lubricating oil supplyC
tripping the governor emergency stop leverD
shutting off the fuel supply
考题
单选题Excessive vibration in an operating diesel generator may be caused by ()A
electrical overloadB
surging at governed RPMC
loose engine mounting boltsD
coolant leaking into the cylinder
考题
单选题A probable cause for a turbo generator tripping out on overspeed is a sudden()A
loss of field excitationB
total loss of loadC
large increase in loadD
loss of steam pressure
考题
单选题To check the setting of the overspeed trip on a diesel powered generator, you would use a ().A
tachometerB
torsion meterC
dynamometerD
pony brake
考题
单选题The size of the exhaust valve opening is ()A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
考题
单选题Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to()A
higher speed requiredB
flywheel-effectC
lower starting temperaturesD
higher compression pressures
考题
单选题An overspeed safety device is usually fitted to a generator engine for () in the event of overspeed.A
cutting power off the engineB
increasing the fuel pump settingC
braking the crankshaftD
stabilizing the ship speed
考题
单选题Most often () is attached to the engine-propeller shaft for efficient electric power generation.A
a variable-speed AC generatorB
a fixed-speed AC generatorC
an air blowerD
a DC generator
考题
单选题“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft()A
a centrifugeB
an electric motorC
a bowl assemblyD
a driving motor
考题
单选题The load limitation of governor should be reduced when ship navigating at sea, the main reason is to()A
prevent the diesel engine surgingB
prevent governor from being damaged because of swingC
reduce the probability of the crank shaft being torsional vibrated and resonatedD
prevent the main engine being overload or overspeed
考题
单选题The purpose of the flywheel of a diesel engine is to ().A
counterbalance the crank throws on the crankshaftB
keep the engine running smoothly between power strokeC
provide a belt-driving surface for the operation of auxiliary machineryD
prevent the engine from overspeeding
考题
单选题The booster pump, which supplies diesel oil to() , should have a possibility of being powered by compressed air or by emergency power.A
the main enginesB
the auxiliary enginesC
the emergency generator engineD
the auxiliary engines and the main engine(s)
考题
单选题The speed of the turbocharger for a four-stroke/cycle diesel engine driving a generator at constant speed depends on the ()A
engine speedB
kilowatt loadC
fuel injection pressureD
air intake manifold temperature
考题
单选题A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided.This could be caused by()A
an incorrect diesel generator governor speed droop adjustmentB
a faulty reverse power relay within the main circuit breaker assemblyC
unsynchronized isochronous load distribution adjustmentsD
a different speed setting on each unit
考题
单选题In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs ()A
once every crankshaft revolutionB
once every two crankshaft revolutionsC
once every piston strokeD
twice every piston stoke
考题
单选题The overspeeding of the diesel engine driving an electric generator could cause ().A
low voltage trip to tripB
reverse power trip to tripC
damage to windingsD
excessive exhaust temperatures
考题
单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?()A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
The pressure cap must be removed while the engine is securedD
Electrical power to the heater must be secured before the cooling system is drained
考题
单选题On a diesel engine, fuel is delivered into the combustion space by ().A
a cooling systemB
a lubrication oil systemC
an electric systemD
an injection system
考题
单选题Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?()A
Low cooling water outlet temperatureB
High lube oil pressureC
Low lube oil temperatureD
Low starting air pressure
热门标签
最新试卷