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单选题
364.发动机正常自动起动控制逻辑( )During normal auto starting,the control logic is :
A
25%N2供油+点火,50%N2关起动活门并停止点火. 25%N2 fueling and ignition,50%N2 close the start valve and cut off the ignition.
B
25%N3供油+点火,50%N3关起动活门并停止点火. 25%N3 fueling and ignition,50%N3 close the start valve and cut off the ignition.
C
冷转30秒后供油+点火,50%N3关起动活门并停止点火. after cranking 30 seconds, fueling and ignition,50%N3 close the start valve and cut off the ignition.
答案解析
正确答案：B
解析：
题目解析
答案: B
解析: 发动机起动过程中，正常的控制逻辑是在达到一定的N3（高压转速）时进行燃油供给和点火，然后在N3达到另一个阈值时关闭起动活门并停止点火。选项B中描述的是正确的逻辑，即在25%N3供油和点火，50%N3时关闭起动活门并停止点火。
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