19.離心泵與往復泵相比，下列何者是離心泵主要的特點？ (A)不能抽送含雜質的污水 (B)自吸能力差 (C)流量不均勻 (D)管理維修較麻煩

19.離心泵與往復泵相比，下列何者是離心泵主要的特點？
(A)不能抽送含雜質的污水
(B)自吸能力差
(C)流量不均勻
(D)管理維修較麻煩

答案：登入後查看
統計： A(58), B(236), C(60), D(8), E(0) #787844

詳解 (共 1 筆)

蔡捷仁

B1 · 2016/07/10

#1412865

離心泵一定要經過預先注入所需輸送的液體或經由真空泵抽除泵殼內的氣體

否則泵殼內為氣室無法壓力不足以將液體吸入.

9.Blowers are used with many diesel engines to supply the air necessary for combustion to the engine’s cylinders. When the pressure of this air is increased above atmospheric pressure, referred to as supercharging, the power output of engine is increased. In addition, in a two-stroke engine the air supplied by the blower helps to purge the engine’s cylinders of exhaust gas. This is referred to as scavenging. Based on these descriptions, please specify the correct statement. (A)The scavenging and supercharging processes share identical purpose of increasing the static pressure in the intake pipes. (B)The use of blow for scavenging and supercharging is due to its characteristics of high-pressure and low volumetric flow rate. (C)The blower for marine application is always the centrifugal type as it offers the high speed characteristic. (D)The scavenging in a two-stroke engine assists to purge the engine’s exhaust gas which has beneficial effect for combustion.

19.離心泵與往復泵相比，下列何者是離心泵主要的特點？
(A)不能抽送含雜質的污水
(B)自吸能力差
(C)流量不均勻
(D)管理維修較麻煩

詳解 (共 1 筆)

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