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單項選擇題

The part of a fuse that melts and opens the circuit is made of （）.

A.copper and antimony
B.steel and babbitt
C.aluminum or beryllium alloy
D.zinc or an alloy of tin and lead

單項選擇題

Time delayed or delayed action-type fuses are designed to （）.

A.prevent grounds in branch circuits
B.prevent opens in motor circuits
C.permit momentary overloads without melting
D.guard lighting and electronic circuits

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What will be the phase angle relationship of a six-pole, three-phase, rotating field generator （）.

你可能感興趣的試題

The part of a fuse that melts and opens the circuit is made of （）.

Time delayed or delayed action-type fuses are designed to （）.