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【单选题】
Why won't the car start?A.
It has no gas.
B.
The door won't open.
C.
The battery is broken.
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举一反三
【单选题】If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed the _____.
A.
contacts are carrying excessive current
B.
contacts have become welded together
C.
shading coil is broken
D.
shading coil is loose
【单选题】Motor controller or starter contacts may become welded together if the contacts _____.
A.
open too quickly and arc
B.
close under excessive pressure
C.
open or close too quickly
D.
close under excessive starting current
【单选题】Motor controller or starter contacts may become pitted and welded together if the contacts _____.
A.
open under loaded conditions
B.
close slowly with light pressure
C.
open too quickly and arc
D.
close quickly with proportionate pressure
【单选题】Motor starter or controller contacts may become welded together if the contacts ( )
A.
open too quickly and arc
B.
close under excessive pressure
C.
open or close too quickly
D.
close under excessive starting current
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