搜题

【单选题】

Air chambers are usually fitted to reciprocating pumps in order to （）.

A、increase discharge pressure

B、increase suction vacuum

C、develop pulsation flow

D、keep a steady rate of flow

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更多“Air chambers are usually fitted to reciprocating pumps in order to （）.”相关的问题

第1题

[] In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the （）.

A、A.first stage flash chamber B、B.second stage flash chamber C、C.first stage after condenser D、D.second stage distilling condenser

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第2题

[单选题] The air compressor pumps air to the （）.

A、expansion tank B、combustion chamber C、air receiver D、evaporator

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第3题

[单选题] The air compressor pumps air to the （）.

A、air cylinder B、combustion chamber C、steam drum D、expansion tank

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第4题

[单选题] The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.

A、air bottle B、air compressor C、crank case D、combustion chamber

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第5题

[单选题] Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

A、positive displacement B、ejector C、centrifugal D、air compressor

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第6题

[单选题] Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

A、positive displacement B、ejector C、centrifugal D、air compressor

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第7题

[单选题] When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.

A、air chamber B、head lank C、primer D、prime mover

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第8题

[单选题] On opposite ends of a single shaft of a turboblower are a gas driven （）and a air compressor, which are sealed each other.

A、charge air receiver B、scavenging air belt C、turbine D、air cooler

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第9题

[单选题] In many areas “atoll” clouds (clouds of vertical development) are produced over small islands. These are the result of（）.

A、rising air currents produced by the warm islands B、warm air from the sea rising over higher land areas C、cool land air mixing with warm sea air D、descending air over the islands

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