A.90~0 kw
B.127~27 kw
C.155~70 kw
D.194~85 kw
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A.normal operation
B.a dirty commutator
C.increased brush capacity
D.water vapor absorption
A.high mica condition
B.low ambient temperature
C.clogged ventilation ducts
D.an open in the shunt field
A.ampere
B.volt
C.watt
D.ohm
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)
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）
最新試題
The main purpose of port State control is not to（）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
Flame failure in an automatically fired auxiliary boiler can from a/an （）
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
Cold weather starting of a diesel engine may be made easier by（）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
If separating effect is not good, which measure should be taken （）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
To proceed to the assistance of a ship in distress is（）