【单选题】
配煤过程中___是反映各种煤混合程度的指标,也是控制单位时间内入炉煤煤质波动范围的指标。
A. 混煤的挥发分;
B. 混煤的比例;
C. 混煤的粒度;
D. 混煤的发热量。
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相关试题
【单选题】
推煤机如需放机油并且使悬浮在表面的杂质随机油一起排除时,应在发动机熄灭后___。
A. 立即进行;
B. 冷却一段时间后进行;
C. 温度与环境温度相同时再进行;D、低于环境温度时进行。
【单选题】
燃煤应按品种或___分类,分堆存放。
A. 水分;
B. 挥发分;
C. 煤质;
D. 含碳量。
【单选题】
非矿区火力发电厂煤炭储备量不低于___天耗用量。
A. 6~12;
B. 3~5;
C. 15~20;
D. 20天以上。
【单选题】
库存煤盘点一般___,盘点前需将煤场、煤沟等库存煤整理成一定形状,然后丈量计算出体积,并根据煤的密度计算出库存煤量。
A. 每月进行三次;
B. 每月进行一次;
C. 三个月进行一次;
D. 半年进行一次。
【单选题】
运煤过程中常说的“三大块”不包括___。
A. 大石块;
B. 大木块;
C. 大铁块;
D. 大冻块。
【单选题】
单路输煤系统设计出力1000t/h,双路同时运行,系统最大输送量为___t/h。
A. 2000;
B. 1500;
C. l000;
D. 500。
【单选题】
运行中煤的挥发分和硫分增大时,输煤系统应注意做好___和煤自燃的措施。
A. 防自流;
B. 防事故停机;
C. 防尘;
D. 防爆。
【单选题】
一般煤的自然堆积角为___。
A. 5°~10°;
B. 10°~20°;
C. 30°~45°;
D. 50°~60°。
【单选题】
红外线解冻库里采用煤气红外线辐射器作热源,以___进行解冻。
A. 对流热;
B. 辐射热;
C. 传导热;
D. 蒸汽。
【单选题】
装煤气红外线原煤解冻库时,必须制订有关___的安全措施。
A. 防止触电;
B. 防止盗窃;
C. 防火防爆;
D. 防粉尘超标。
【单选题】
TD75型皮带机型号中“TD”意为___。
A. 通用带式;
B. 统一型皮带机;
C. 皮带机;
D. 输送设备。
【单选题】
带式输送机在通常情况下,倾斜向上运输的倾角不超过___。
A. 35°;
B. 28°;
C. 20°;
D. 18°。
【单选题】
高倾角花纹带式输送机主要用于提升角度要求较大的输送,其倾角一般为___。
A. 18°;
B. 20°;
C. 28°~35°;
D. 40°。
【单选题】
带式输送机布置倾斜角超过4°时,一般都要设置___装置。
A. 制动;
B. 清扫;
C. 调偏;
D. 除尘。
【单选题】
钢丝绳芯胶带机的槽角一般为___。
A. 20°;
B. 30°;
C. 45°;
D. 60°。
【单选题】
普通皮带机的带速不超过___m∕s。
A. 1.5;
B. 2.5;
C. 3.15;
D. 4.5
【单选题】
配煤段带速一般不超过___。
A. 4m/s;
B. 5m/s;
C. 3.5m/s;
D. 2.5m/s;
【单选题】
检测带式输送机横向水平度用___。
A. 观察法;
B. 钢尺测量;
C. 深度游标卡尺测量;
D. 玻璃水平管测量。
【单选题】
在带式运输机中,成本最大是___。
A. 托辊;
B. 胶带;
C. 滚筒;
D. 驱动装置。
【单选题】
输煤胶带在带式输送机成本中约占___的比重。
A. 30%;
B. 40%;
C. 50%;
D. 60%。
【单选题】
如果天气较寒冷,有结冰的可能性时,推煤机停车后应待冷却水的温度降低些再将水全部放出,降低后的水温度在___℃左右。
A. 80;
B. 60;
C. 50;
D. 40。
【单选题】
装有犁煤式卸料器的带式输送机,为减少胶带磨损,带速一般不宜超过___。
A. 3.5m/s;
B. 2.5m/s;
C. 2m/s;
D. 1.8m/s。
【单选题】
皮带跑偏是因为皮带受到了一个指向跑偏侧的___的作用。
A. 弹力;
B. 摩擦力;
C. 压力;
D. 拉力。
【单选题】
皮带跑偏开关一般设置___级警示或保护信号。
【单选题】
皮带输送机的跑偏导致立辊倾斜角达到___时,集控室能收到事故停机信号。
A. 20°;
B. 25°;
C. 30°;
D. 35°。
【单选题】
输煤皮带运行中应注意监视、调整,使得皮带跑偏位移不超过___mm。
A. 50;
B. 100;
C. 200;
D. 250。
【单选题】
用硫化热胶接输送带接头时,其硫化温度是___℃。
A. 120;
B. 130;
C. 145;
D. 180。
【单选题】
用冷粘剂胶接输送带接头时,固化时间不低于___ min。
A. 20;
B. 40;
C. 50;
D. 60。
【单选题】
带式输送机的胶带接头不正,运行中胶带跑偏现象是___。
A. 整条胶带向一侧跑偏,最大跑偏在接头处;
B. 接头跑偏,其余不跑偏;
C. 两头跑偏,其余不跑偏;
D. 在滚筒处跑偏,其余不严重。
【单选题】
带式输送机胶带跑偏的原因之一是落煤点不正,处理方法是___。
A. 调整导料槽;
B. 调整落煤点.
C. 调整落煤管;
D. 调整落煤点托辊。
【单选题】
造成输煤系统皮带打滑的主要原因是___。
A. 落煤偏斜;
B. 传动滚筒偏斜;
C. 初张力太小;
D. 没有调偏辊。
【单选题】
以下不会导致输煤胶带打滑的原因是___。
A. 拉紧重锤配重轻;
B. 带负荷启动;
C. 非工作面有水;
D. 滚筒黏煤。
【单选题】
___会造成带式输送机的胶带打滑。
A. 头、尾滚筒中心线不平行;
B. 落煤点不正;
C. 皮带机过载;
D. 皮带接口不正。
【单选题】
胶带无载时发生跑偏,加上物料就能正,原因是___。
A. 初张力太大;
B. 滚筒粘煤;
C. 落煤点不正;
D. 滚筒缺油。
【单选题】
胶带在运行中从某点开始局部跑偏,调整方法是___。
A. 检修或更换滚筒;
B. 调整脱辊位置;
C. 矫正机架;
D. 加固机架。
【单选题】
胶带只在滚筒处跑偏,应该调整___。
A. 驱动装置;
B. 拉紧装置;
C. 滚筒位置;
D. 托辊。
【单选题】
落煤筒严重堵塞会使上级皮带机电机的电流___。
A. 上升;
B. 下降;
C. 不变;
D. 不确定。
【单选题】
跨越皮带时必须是___。
A. 皮带已停止运行;
B. 经过通行桥;
C. 没有看见,快速跨越;
D. 皮带运行。
【单选题】
胶带输送机的驱动装置是带式输送机动力的来源,电动机通过联轴器和减速器带动传动滚筒转动,借助于滚筒与胶带之间的___使胶带运转。
A. 离心力;
B. 摩擦力;
C. 重力;
D. 惯性力。
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A. It's my pleasure.
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【单选题】
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A. I think you don't like it.
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【单选题】
___ I'd like to place an order please.
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B. I can help you.
C. What are you doing?
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【单选题】
- Do you know the girl over there?___
A. How can I know?
B. Yes, I remember it now.
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- Shall we go out for dinner tonight?____
A. No, you can't.
B. Yes, please.
C. Thank you, I don't want to.
D. Sorry, I have a report to finish.
【单选题】
- I think the reference book(参考书)is very helpful.____
A. Good idea.
B. So do I.
C. With pleasure.
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【单选题】
- I wish you success in your career.____
A. You are welcome.
B. I think so.
C. Yes, please.
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【单选题】
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A. Yes, last night.
B. Yes, over there.
C. Sure, I'd love to.
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A. I hope you enjoy it
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【单选题】
- Thanks for the lovely party and the delicious food. ____
A. No, thanks.
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A. What do you mean?
B. I don't think so.
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D. Yes, I do. Do you?
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A. I'll take it.
B. It's a good idea.
C. You bet!
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【单选题】
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A. Cheers
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【单选题】
- You have won the football game. Congratulations! ____
A. We are really lucky.
B. No one else could do it.
C. Oh, not really.
D. It's nice of you to say so.
【单选题】
- Excuse me, when will the 17:15 train arrive____
A. I don't tell you.
B. It's been delayed one hour.
C. You have to be patient.
D. Don't ask me.
【单选题】
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B. I'm not Mary.
C. Who are you?
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A. Don't ask me.
B. Parking is very difficult.
C. Sorry, I'm a stranger here.
D. Sorry, you can't park here.
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- Sorry, ___
A. here you are.
B. take it.
C. it's taken.
D. never mind.
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A. It's a map.
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- I hear you got through your exam. Congratulations!____
A. No. I didn't do well enough.
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B. I won't.
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A. Excuse me
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A. No thanks
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