搜题

【单选题】

The gear and screw pumps are classified as （）.

A、variable stroke pumps

B、multistage pumps

C、positive displacement pumps

D、triple-ported pumps

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更多“The gear and screw pumps are classified as （）.”相关的问题

第1题

[单选题] The majority of automatic mooring winches are spur geared to improve the backward efficiency of the gear train for rendering（）

A、spur geared  B、screw geared  C、worm geared  D、belt driven  

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第2题

[单选题] Under rotary pumps are the gear, （）, cam-and-piston and screw types.

A、reciprocating  B、diffuser  C、turbine  D、vane  

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第3题

[单选题] One of the main differences between the various types of screw pumps is in the （）.

A、stuffing box diameter  B、direction of rotation of the screws  C、pitch of the screws  D、type of driving gears  

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第4题

[单选题] Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screw

A、（1）and（2）  B、（1），（2）and（3）  C、（1）and（3）  D、（2）and（3）  

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第5题

[单选题] The gear, screw, and vane pumps are all classified as （）.

A、variable stroke pumps  B、multistage pumps  C、positive displacement pumps  D、triple-ported pumps  

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第6题

[单选题] The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.

A、screwing into  B、being screw on  C、to screw on  D、screwed into  

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第7题

[] In a （） the center screw is driven and the outer screws idle.

A、A.single screw pump  B、B.double-screw pump  C、C.triple screw pump  D、D.centripetal pump  

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第8题

[单选题] A technician is trying to retrieve a screw that fell inside a case and is just out of reach. Which of the following is the BEST procedure to retrieve the screw?（）

A、Turn the case upside down, shake gently and let the screw fall out.  B、Use a shop vacuum to retrieve the screw.  C、Use the hardware abstraction layer (HAL).  D、Use an extension magnet.  

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第9题

[单选题] （） connected to the moving tiller will bring the floating lever pivot and the lever into line at right angles to the screw shaft axis.

A、A cut-off lever  B、A swivel block  C、A cross-head  D、A driving gear  

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