【判断题】
(32175)发电机允许电压在额定值的±10%范围内长期运行。(1.0分)
A. 对
B. 错
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答案
B
解析
暂无解析
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(32176)在1FC5系列发电机中,短接F1和F2将造成发电机端电压降低至360V左右。(1.0分)
A. 对
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(32177)康明斯发电车中发电机的磁极对数为4,故额定转速为1500rpm。(1.0分)
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(32178)同一台发电机的三相绕组作星形联接时的相电压等于作三角形接法时的线电压。(1.0分)
A. 对
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【判断题】
(32179)对于同步发电机,电枢反应是指发电机在带负载运行时,励磁绕组所产生的磁场对定子绕组所产生的旋转磁场的影响。(1.0分)
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(32180)1FC5发电机当励磁分流电阻R断路时,可引起发电机端电压升高到450V以上。(1.0分)
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(32181)康明斯发电车1FC5356发电机中若T1、T2、T3中任何接线断路都将造成发电机空载电压偏低。(1.0分)
A. 对
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(32182)三相异步电动机的转速取决于电源频率和极对数,而与转差率无关。(1.0分)
A. 对
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(32183)三相异步电动机的额定温升是指电动机额定运行时的额定温度。(1.0分)
A. 对
B. 错
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(32184)异步电动机的电磁转矩与电动机的输出功率成正比。(1.0分)
A. 对
B. 错
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(32185)为了提高三相异步电动机的启动转矩,可使电源电压高于电机的额定电压,从而获得较好的启动性能。(1.0分)
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(32186)康明斯发电车冷却风机的高低速切换是利用电机双绕组切换原理来达到的。(1.0分)
A. 对
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(32187)运用客车质量鉴定条件中,发电车48V蓄电池电解液面高度、密度、电压不符合规定属B类故障。(1.0分)
A. 对
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(32188)备用客车无须定期的对蓄电池进行补充电。(1.0分)
A. 对
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(32189)柴油机中控制冷却水大小循环的部件是节温器。(1.0分)
A. 对
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(32190)发电车的冷却装置是采用自然风利用列车的运行形成的风流进行热量交换。(1.0分)
A. 对
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(32191)各种车辆要保持消防器材齐全,作用良好;灭火器须使用电器、油料专用灭火器。(1.0分)
A. 对
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(32192)通过发电车电气控制,可以避免一切人为地误操作。(1.0分)
A. 对
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(32193)在康明斯电子调速器调速板中,SPEED ADJUST旋钮可调整的转速范围是±100转/分。(1.0分)
A. 对
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【判断题】
(32194)在康明斯电子调速器调速板中,RUN SPD旋钮可以在对外供电时来适当调整柴油机的转速。(1.0分)
A. 对
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A. 对
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(32196)当康明斯发电车需单机同时往Ⅰ、Ⅱ路供电时,只需在单机单路供电的基础上,再合4QF开关即可。(1.0分)
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(32197)康明斯发电车中,当柴油机转速高于1725r/min时,将发生超速停机报警保护。(1.0分)
A. 对
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(32198)康明斯发电车中,当机油压力低于83kPa时,将发生低油压停机报警保护。(1.0分)
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(32199)正常情况下柴油机是不消耗机油的。(1.0分)
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(32200)发电车冷却滤网不能用水冲洗。(1.0分)
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(32201)运用客车质量鉴定条件中,发电车膨胀水箱水位低于1/2,水质不符合规定属C类故障。(1.0分)
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(32204)柴油机在调整气门间隙时,必须在所要调整的气门处于完全关闭时进行。(1.0分)
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(32207)KTA-19G2柴油机中LF777脏堵将造成柴油机低油压。(1.0分)
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(32208)中间继电器也是电流继电器,只是触头较多。(1.0分)
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(32209)时间继电器的触点是延时断开的。(1.0分)
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(32213)KTA-19G2柴油机喷油摇臂折断将造成油底壳进柴油。(1.0分)
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(32214)带极高油位报警的康明斯发电车中,当手动位出现极高油位报警时,电路也将自动停止泵油,并同时发出声光双报警。(1.0分)
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(32215)带极低油位报警的康明斯发电车中,当手动位出现极低油位报警时,电路也将自动开始泵油,并同时发出声光双报警。(1.0分)
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