A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.

A、annular blowout preventer

B、annulus

C、accumulator

D、automatic choke

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更多“A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.”相关的问题

第1题

[单选题] The valve on the discharge side of a cargo pump on a tanker will usually be a（）.

A、butterfly valve B、spectacle valve C、check valve D、globe valve

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第2题

[] The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.

A、A.butterfly valve B、B.spectacle valve C、C.check valve D、D.globe valve

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第3题

[单选题] Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.

A、globe valves B、butterfly valves C、gate valves D、reducing valves

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第4题

[单选题] The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.

A、main stem stop valve B、auxiliary steam stop valve C、feed check or control valve D、blow down valve

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第5题

[单选题] The（）is fitted in the main steam supply line and is usually of the non-return type.

A、main steam stop valve B、auxiliary steam stop valve C、feed check or control valve D、blow down valve

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第6题

[单选题] Valve cages are used on some large diesel engines to （）

A、reduce wear on the valve stem B、permit the use of alloy valve seat materials C、reduce heat transfer from the valve seat D、facilitate valve removal for servicing