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
There is a danger of the starting current that the windings are burnt out()
A
to increase
B
to be so increased
C
increased
D
being so increased
参考答案
参考解析
解析:
暂无解析
更多 “单选题There is a danger of the starting current that the windings are burnt out()A to increaseB to be so increasedC increasedD being so increased” 相关考题
考题
Copper losses are _____ losses in the primary and secondary windings of the transformer core.
A、inductiveB、capacitiveC、resistiveD、reactive
考题
The disadvantage of the non-synchronous motor is that it requiresoand it produces a low starting-torque
A.much initial currentB.direct currentC.little initial currentD.constant current
考题
In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .A.The generator need not excitation.B.The winding on the rotor is for inputting excitation current.C.There are three phase windings on the rotor.D.The generator has no brushes.
考题
In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A.Noise coming from that air starting valveB.Continuous operation of the starting air compressorC.Zero air pressure in the air starting systemD.Overheated starting air pipe to the cylinder head
考题
Which of the following components are used to convert alternating current produced in the generator windings to direct current?A.Armature and equalizerB.Commutator and brushesC.Rotor and interpolesD.Field and exciter
考题
All the following is true except that ______.A.in many places a counter current flows in opposition to the main current close to the bankB.current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the windC.as speed is reduced,the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructionsD.when close to the berth in a head current,there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces
考题
The lifeboat releasing gear lever should be marked with the words ______.A.DANGER,DO NOT TOUCHB.DANGER,BOAT MAY DROPC.DANGER,LEVER RELEASES BOATD.DANGER,LEVER DROPS BOAT
考题
把路由器当前配置文件存储到NVRAM中的命令是(57) 。A.Router(confg)#copy current to starting
B.Router#copy start to running
C.Router(config)#copy running-config starting-config
D. Router#copy run startup
考题
把路由器当前配置文件存储到NVRAM中的命令是( ) 。A.Router(confg)#copy current to starting
B.Router#copy start to running
C.Router(config)#copy running-config starting-config
D.Router#copy run startup
考题
把路由器当前配置文件存储到NVRAM中的命令是(57) 。A.Router(confg)#copy current to startlng
B.Router#copy startmg to running
C.Router(config)#copy running-config starting-config
D.Router#copy run startup
考题
单选题Vessels having main engines arranged for air starting are to be provided with at least ()A
one automatic drain serving both containersB
two air starting containers of approximately equal sizeC
one control air container and one starting air containerD
one additional means of starting the main engine
考题
单选题All the following is true except that().A
in many places a counter current flows in opposition to the main current close to the bankB
current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the windC
as speed is reduced,the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructionsD
when close to the berth in a head current,there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces
考题
单选题The starting current of an a-cmotor is () the rated current.A
the same asB
much larger thanC
less thanD
equals
考题
单选题FLOATING,CAUSED BY WINDS AND CURRENT WITH A DETERMINABLE DIRECTION defines().A
FloatingB
SailingC
DriftingD
Running into danger
考题
单选题The main purpose of an electric space heater installed in a large AC generator is to ()A
prevent the windings from becoming brittleB
prevent moisture from condensing in the windings during shutdownC
prevent acidic pitting of the slip ringsD
keep the lube oil warm for quick starting
考题
单选题Which of the following may cause that an engine doesnt turn on starting air?()A
too low starting air pressureB
main starting valve closedC
neither A nor BD
A and B
考题
单选题A fire, occurring in the windings, of an overloaded electrical motor, is considered a ().A
class A fireB
class B fireC
class C fireD
class D fire
考题
单选题Which statement is TRUE concerning the danger signal?().A
When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signalB
Only the stand-on vessel can sound the danger signalC
Distress signals may be used in place of the danger signalD
The danger signal consists of 4 or more short blasts of the whistle
考题
单选题Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation ()A
is good for long term preserving since most insulation is organic and contains some amountB
lowers the insulation value and is a common cause of fault grounds in idle machinesC
will enhance insulation resistance only if it is fresh water and contains no saltD
reduces the amount of current supplied or drawn by the machine so horsepower is limited
考题
单选题The function of damper windings in a synchronous motor is to ().A
eliminate slippageB
provide excitationC
provide starting torqueD
increase efficiency
考题
单选题Reduced voltage applied to a motor during the starting period will ().A
result in decreased acceleration time onlyB
lower the starting current and increase accelerating timeC
cause a greater starting torqueD
increase the starting current and pump capacity
考题
单选题Which of the following components are used to convert alternating current produced in the generator windings to direct current?()A
Armature and equalizerB
Commutator and brushesC
Rotor and interpolesD
Field and exciter
考题
单选题The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the().A
loss of residual magnetismB
absorption of moisture in the insulationC
insulation varnish flakingD
dirt collecting on the windings
考题
单选题DC generators are classified according to the manner in which()A
they are usedB
the field windings are connected to the loadC
the armature circuit is connected to the loadD
the field windings are connected to the armature circuit
考题
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?()A
noise coming from that air starting valveB
continuous operation of the starting air compressorC
zero air pressure in the air starting systemD
overheated starting air pipe to the cylinder head
考题
单选题The diesel engine must be started before it can run by it self For this purpose () has to be used.A
a starting systemB
the starting airC
a starting operationD
A, B and C
热门标签
最新试卷