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【单选题】
机组正常运行时,密封油冷却器出口油温应保持在___℃之间。
A. 40~49
B. 35~40
C. 40~55
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答案
A
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相关试题
【单选题】
机组正常运行时,空侧密封油回油温度≤___℃。
A. 58.6
B. 55
C. 56
【单选题】
机组正常运行时,氢侧密封油回油温度≤___℃。
A. 54.6
B. 65
C. 69
【单选题】
密封油系统中的刮片式滤油器每___小时应转动一次手柄,清理污垢。
A. 8
B. 12
C. 24
【单选题】
密封油第一备用油源是汽机主油泵来的2.1MPa高压油,当主工作油源发生故障、氢油压差降到___MPa时,该油源由备用压差调节器控制调节,维持氢油压差(A)MPa。
A. 0.056
B. 0.084
C. 0.065
【单选题】
密封油第二备用油源是由汽机主油箱上的备用交流密封油泵提供,当汽机转速低于2800r/min或发生故障且氢油压差降到___MPa时,则由备用交流密封油泵提供密封油。该油源由备用压差调节器控制调节,维持油氢压差(A)MPa。
A. 0.056
B. 0.084
C. 0.065
【单选题】
密封油第三备用油源是由直流密封油泵提供,当氢油压差降到0.035MPa时,启动直流密封油泵,使密封油压恢复并保证氢油压差___MPa。
A. 0.056
B. 0.084
C. 0.065
【单选题】
密封油第四备用油源是由主机润滑油系统供给,提供的油压较低,要求该油源在密封油装置入口处的油压不低于0.2MPa。该油源投入运行后,维持发电机内氢压___MPa。
A. 0.056
B. 0.084
C. 0.014
【单选题】
氢侧密封油正常工作油源由氢侧交流密封油泵供给,在交流密封油泵故障或交流油泵出入口压差降到___MPa时,氢侧备用交流密封油泵自动联动提供氢侧密封用油。
A. 0.056
B. 0.084
C. 0.035
【单选题】
运行中真空泵电流不应该超过___
A. 237A
B. 248A
C. 307A
【单选题】
运行中汽动给水泵前置泵电流不应超过___。
A. 59安培
B. 67安培
C. 76安培
【单选题】
正常运行中开式水泵电流不应超过___。
A. 289安培
B. 39安培
C. 350安培
【单选题】
正常运行中EH油泵电流不应超过___。
A. 81安培
B. 78安培
C. 85.5安培
【单选题】
当发电机定子绕组进出水压差值降低到50%额定水流量时,由3个模拟量(按“3取2”)的逻辑原则作为发电机断水保护的信号。延时___秒保护动作机组跳机.
A. 60
B. 120
C. 30
D. 15
【单选题】
除氧器水位低于___mm保护未动作,应紧急停止给水泵运行。
A. 900
B. 1000
C. 1500
D. 700
【单选题】
电动给水泵润滑油压力下降至___MPa,电泵跳闸。
A. 0.08
B. 0.18
C. 0.20
D. 0.12
【单选题】
电动给水泵油滤网压差大于___MPa,应切换备用滤网运行。
A. 0.1
B. 0.06
C. 0.12
【单选题】
汽动给水泵升速过程中机械密封水回水温度不大于___℃。
A. 85
B. 75
C. 65
【单选题】
凝汽器水位正常水位___mm。
A. 480-700
B. 350-600
C. 400-700
【单选题】
凝汽器水位高Ⅰ水位是___mm。
A. 810
B. 750
C. 710
【单选题】
凝汽器水位高Ⅱ值是___ mm。
A. 1000
B. 1120
C. 1180
【单选题】
凝汽器水位低Ⅰ水位是 ___ mm。
A. 400
B. 250
C. 300
【单选题】
凝汽器低Ⅱ水位___ mm。
A. 150
B. 200
C. 100
【单选题】
我厂凝补水箱正常水位___mm。
A. 2800mm~3100
B. 300mm~760
C. 400mm~860
【单选题】
我厂凝补水箱低至___mm跳凝上水泵。
A. 300
B. 600
C. 200
【单选题】
凝结水泵轴承冷却水取自___。
A. 闭式水
B. 开式水
C. 工业水
【单选题】
我厂凝结水泵密封水压力在___Mpa范围内。
A. 0.5~07
B. 0.25~0.60
C. 1.0~1.2
【单选题】
凝结水泵电动机推力轴承温度___℃报警。
A. 80
B. 70
C. 75
D. 85
【单选题】
凝结水泵电动机线圈温度___℃报警。
A. 115
B. 120
C. 130
D. 100
【单选题】
凝结水泵电动机轴承温度___℃报警,
A. 80
B. 85
C. 90
D. 95.
【单选题】
凝结水泵电动机推力轴承温度___℃时保护停泵。
A. 90
B. 70
C. 75
D. 85
【单选题】
开式水泵运行时,轴承温度不应高于___℃。
A. 70
B. 90
C. 80
【单选题】
开式水泵运行时,出口压力应大于___。
A. 0.5MPa
B. 0.35MPa
C. 0.3MPa
【单选题】
循环水系统正常运行时,应维持循环水母管压力>___MPa。
A. 0.2
B. 0.12
C. 0.15
【单选题】
循环泵的运行时电机电流≤___A。
A. 239
B. 368
C. 348
【单选题】
循环泵的运行时电机定子绕组温度<___℃。
A. 140
B. 110
C. 125
【单选题】
循环泵的运行时电机推力轴瓦及导向轴瓦温度<___℃。
A. 70
B. 90
C. 85
【单选题】
凝结器真空上升到一定值时,因真空提高多发的电与循环水泵耗电之差最大时的真空称为___。
A. 绝对真空;
B. 极限真空;
C. 最佳真空;
D. 相对真空。
【单选题】
凝汽器内真空升高,汽轮机排汽压力___。
A. 升高;
B. 降低;
C. 不变;
D. 不能判断。
【单选题】
闭式冷却水系统是由二台100%容量的闭式冷却水泵,一个___ m3闭式稳压水箱和二台100%容量的闭式冷却水热交换器设备组成的。
A. 30
B. 25
C. 10
【单选题】
闭式水箱水位维持在___mm。
A. 1600~1800
B. 1200~1400
C. 1000~1400
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( ) 32. What does the expression “to touch all bases” mean? A. To try your best to set a new record. B. To get a chance to be the greatest hitter. C. To do what is needed to finish an activity. D. To solve the problems successfully.
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