Some large A-Cmotors are equipped with heatersThese could be （）
(1)resistance heaters bolted directly to the frame
(2)low voltage windings embedded in the motor windings
A.(1) only
B.(2) only
C.either (1) or (2)
D.neither (1) or (2)
您可能感興趣的試卷
你可能感興趣的試題
In order to change the direction of rotation of a D-Cmotor （）
(1) the field leads must be changed
(2) the input leads must be changed
A.（1）only
B.（2）only
C.either（1）or（2）
D.neither（1）or（2）
If a small electric motor is immersed in salt water it should be （）
(1) washed in fresh water
(2) dried in an oven
A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) or (2)
A.ampere
B.kilovolt
C.watt
D.farad
A.wasted energy
B.efficient operation
C.a short in the exciter field windings
D.an excessive number of minor system grounds
A.increase
B.not change
C.decrease
D.be exactly 60 hertz
最新試題
Using a file without a handle may result in （）
The shipboard oil pollution emergency plan will be invalid after （）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
Under MARPOL Code the ship to which it applies has to carry （）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
If separating effect is not good, which measure should be taken （）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The main purpose of port State control is not to（）