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【单选题】

An electrical device which prevents an action from occurring until all other required conditions are met is called a/an （）.

A、limit

B、monitor

C、modulator

D、interlock

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更多“An electrical device which prevents an action from occurring until all other required conditions are met is called a/an （）.”相关的问题
第1题
[单选题] An electrical device which prevents an action from occurring until all other required conditions are met is called a/an （）.

A、limit  B、monitor  C、modulator  D、interlock  

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第2题
[单选题] Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）

A、Transducer  B、Reducer  C、Transformer  D、Rectifier  

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第3题
[单选题] Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）

A、Transducer  B、Reducer  C、Transformer  D、Rectifier  

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第4题
[单选题] A switchboard for an AC electrical system requires the use of which of the following devices（）.

A、Frequency meter  B、Ohmmeter  C、Induction voltage regulator  D、Current transformer governor  

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第5题
[单选题] Which device is designed to automatically hold the load if power should fail to an electric winch?（）

A、Pneumatic brake  B、Electromagnetic brake  C、Hand brake  D、Motor controller  

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第6题
[单选题] Combustible gas indicators operate by drawing an air sample into the instrument（）.

A、over an electrically heated platinum filament  B、where it is mixed with nitrogen  C、where it is ignited by a sparking device  D、where its specific gravity is measured  

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第7题
[单选题] （） is a machine by which electrical energy is transformed into mechanical energy.

A、An alternator  B、An electric motor  C、A diesel engine  D、A main switchboard  

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第8题
[单选题] An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.

A、magnetic amplifier  B、ship’s service alternator  C、three-wire DC generator  D、saturable core reactor  

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第9题
[] Which of the following devices can route electrical signals only when activated by an external control signal？（）

A、A.Solenoid  B、B.Relay  C、C.Clutch  D、D.Capacitor  

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