不定项选择题：车间C中5号笼型异步电动机额定电流39．2A，启动电流倍数为6．5。采用定时限继电器作为速断保护，电流互感器变比为50／

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题目内容：
车间C中5号笼型异步电动机额定电流39．2A，启动电流倍数为6．5。采用定时限继电器作为速断保护，电流互感器变比为50／5，可靠系数取1．5。计算速断保护动作整定值应为下列哪一项?（　　） A．6A
B．45A
C．70A
D．40A

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答案解析：

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