单项选择题

Fuses placed in series with a thermal trip-type circuit breaker are used for （）.

A.time-delay protection
B.short-circuit protection
C.short duration surge protection
D.sustained overload protection

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单项选择题
The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains （）.

A.a magnetic operating coil
B.normally open line contacts
C.thermal-overload protection
D.a momentary-contact start button
单项选择题
What will be the phase angle relationship of a six-pole, three-phase, rotating field generator （）.

A.60
B.120
C.180
D.360
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