题目内容

反流割断继电器的用途是()。

A. 消除发电机反向输出电流的可能性
B. 防止发电机过载或电压波动
C. 防止发电机电压波动或反流
D. 无论何时,当发电机的电压降到低于蓄电瓶的电压时,它断开发电机供电电路

查看答案
更多问题

直流发电机发生端电压偏低根本原因是:①电枢绕组发生短路;②负载压降;③空载运行;④电枢绕组发生断路;⑤由于电枢反应()。

A. ②或⑤
B. ①或③或④或⑤
C. ⑤
D. ①或②或③

定期维护镍镉碱性蓄电池时,深度放电的目的是消除()。

A. 抑制自放电,内部短路,“热击穿”
B. 防止硬化,单体不平衡
C. 容量失效,记忆性,内部短路
D. 单体不平衡,容量失效

Who may serve as the person in charge of loading and discharge operations aboard a tanker

A licensed officer who holds a tankerman-PIC endorsement
B. The pumpman who has a tankerman assistant endorsement
C. The Master
D. The bosun

While discharging a tanker,list can be controlled by ______.

A. Shoreside personnel
B. Using a center tank near the bow,discharging as necessary
C. Using wing tanks near the longitudinal center,discharging as necessary
D. Using the after peak tank,loading as necessary

答案查题题库