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When operating with a negative suction head, which of the fo

题目
单选题
When operating with a negative suction head, which of the following types of pumps will require priming?（）
A

Reciprocating

B

Centrifugal

C

Rotary

D

Gear

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相似问题和答案

第1题：

EXCEPT when suffering from a head or chest injury a patient in shock should be placed in which position? ______.

A.Head up and feet down

B.Head down and feet up

C.Flat on back with head and feet elevated

D.Arms above the head


正确答案：B

第2题：

When configuring the messaging system， which of the following are valid parameters for the file transport？ （）

  • A、File Name
  • B、Operating System
  • C、Location
  • D、Host
  • E、Mode

正确答案:A,C,E

第3题：

Which of the following terms is used to identify the pressure of the liquid entering a pump?

A.Suction head

B.Pump head

C.Discharge head

D.Total head


正确答案：A

第4题：

单选题
A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.
A

have a greater head capacity

B

operate with increased impeller efficiency

C

discharge through the suction side of the pump casing

D

require more power to run the shaft


正确答案： A
解析： 暂无解析

第5题：

单选题
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
A

from sunset to sunrise and during restricted visibility

B

only when other vessels are in the area

C

only when operating in a traffic separation scheme

D

only when under tow


正确答案： D
解析： 暂无解析

第6题：

tommy has created a sales view in his sales.nsf database. Tommy wants negative numbers in the sales number column in the view parenthesis. which one of the following should tommy do?（）

  • A、select the parenthesis when negative value in the view properties box 
  • B、select the parenthesis when negative value in the column properties box 
  • C、use the @function @negative to set this in the column formula in the view 
  • D、use a formula to format the value in the field on the form that will be displaying in the view

正确答案:B

第7题：

单选题
The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）
A

re-evaporator

B

receiver

C

dehydrator

D

solenoid


正确答案： C
解析： 暂无解析

第8题：

The pressure of a liquid leaving the pump can be referred to as the ______.

A.total head

B.discharge head

C.net positive suction head

D.suction head


正确答案：B

第9题：

单选题
EXCEPT when suffering from a head or chest injury a patient in shock should be placed in which position?（）.
A

Head up and feet down

B

Head down and feet up

C

Flat on back with head and feet elevated

D

Arms above the head


正确答案： D
解析： 暂无解析

第10题：

单选题
The static suction lift of a pump is the difference in elevation between the （）.
A

centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump

B

centerline of the pump and the suction liquid level when the source of liquid is above the pump

C

centerline of the pump and the level of the discharge liquid

D

liquid levels of the suction and discharge


正确答案： C
解析： 暂无解析

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