单选题 Common faults with centrifugal pumps, such as no discharge, may be a result of（）

A、 ①vales in the system being shut

B、 ②suction strainers blocked

C、 either ①or ②

D、 neither ①nor ②

查看答案

由4l***8i提供分享举报纠错

相关试题

单选题 The gear and screw pumps are classified as ( )

A、variable stroke pumps

B、multistage pumps

C、positive displacement pumps

D、triple - potted pumps

查看答案

单选题 Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid ( ) pressure,

A、depending on

B、in relative to

C、regardless of

D、because of

查看答案

单选题 Which of the following statements is TRUE concerning centrifugal pumps?

A、They are particularly suited for pumping high viscosity fluids.

B、hey are started with the discharge valve opened.

C、The flow of liquid is developed by imparting energy due to the rotation of an impeller.

D、They are always mounted in a horizontal position.

查看答案

单选题 A gear pump belongs to ( ) according to its working principle.

A、reciprocating pumps

B、positive displacement pumps

C、centrifugal pumps

D、centripetal pumps

查看答案

单选题 The discharge flow of a reciprocating pump is ( )

A、steady

B、in pulsation

C、continuous

D、large

查看答案

单选题 Some pumps use packing as sealing gland. The gland should be ( )

A、slack enough to allow slight leakage of fluid

B、slightly blocked

C、brought up tight so as not to allow any leakage

D、fitted with a relief valve

查看答案

单选题 A mono - pump is a single - screw pump. That means it consists of ( ) rotor( s).

A、one

B、two

C、three

D、four

查看答案

单选题 A screw pump belongs to ( ) according to its working principle.

A、reciprocating pumps

B、positive displacement pumps

C、centrifugal pumps

D、centripetal pumps

查看答案

单选题 Common faults with centrifugal pumps, such as no discharge, may be a result of（ ）

单选题 Common faults with centrifugal pumps, such as no discharge, may be a result of（）