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额定转速（rated speed）
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更多 “额定转速（rated speed）” 相关考题
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There is a close link between a rising_____of unemployment and a rising suicide_____.
A.ratio; ratioB.speed;speedC.rate;rateD.tendency;tendency
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Compared to a constant pitch propeller, a controllable pitch propellerA.more efficiently uses available engine powerB.operates at a lower efficiency at a fixed speedC.produces the same torque at lower engine powerD.develops its rated power at a lower speed
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离心泵转速振动关系：额定转速3000r/min，振动值（），额定转速1500r/min，振动值（），额定转速1000r/min，振动值（），额定转速1000r/min及以下，振动值（）。
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单选题If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.A
a little lowerB
a little higherC
too lowD
exactly the same
考题
单选题A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.A
slow-speed dieselB
medium-speed dieselC
high-speed dieselD
constant-speed diesel
考题
单选题异步电动机在电动状态时，额定转速、额定转差率分别为（）A
额定转速高于同步转速，额定转差率大于1%B
额定转速低于同步转速，额定转差率大于1%C
额定转速高于同步转速，额定转差率小于1%D
额定转速低于同步转速，额定转差率小于1%
考题
单选题If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）A
too lowB
a little lowerC
a little higherD
exactly the same
考题
单选题Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）A
Loss of suctionB
Increased clearancesC
Decreased clearanceD
Decreased slippage
考题
单选题Compared to a constant pitch propeller, a controllable pitch propeller（）.A
more efficiently uses available engine powerB
operates at a lower efficiency at a fixed speedC
produces the same torque at lower engine powerD
develops its rated power at a lower speed
考题
单选题在主机遥控系统中加速速率限制是指（）。A
主机从起动成功到30%额定转速的加速过程B
主机从起动成功到70%额定转速的加速过程C
主机从30%额定转速到70%额定转速的加速过程D
主机从70%额定转速到100%额定转速的加速过程
考题
单选题在主机遥控系统中，程序负荷限制的起点大约是（）。A
30%额定转速B
50%额定转速C
70%额定转速D
90%额定转速
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