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A circuit breaker differs from a fuse in that a circuit breaker ______.A.melts and must be

A circuit breaker differs from a fuse in that a circuit breaker ______.

A.melts and must be replaced

B.is enclosed in a tube of insulating material with metal ferrules(环) at each end

C.gives no visual indication of having opened the circuit

D.trips to break the circuit and may be reset

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更多“A circuit breaker differs from…”相关的问题

第1题

A circuit breaker and a fuse have a basic similarity（类似) in that they both ______.A.can

A circuit breaker and a fuse have a basic similarity(类似) in that they both ______.

A.can be reset to energize the circuit

B.should open the circuit when overloaded

C.will burn out when an over current flow develops

D.should short the circuit when overloaded

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第2题

术语Circuit breaker意为（）

A.电路板断路器

B.电路板控制器

C.电路板装置

D.电路板箱

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第3题

A circuit breaker and a fuse have a basic similarity in that they both______.A.can be rese

A circuit breaker and a fuse have a basic similarity in that they both______.

A.can be reset to energize the circuit

B.should open the circuit when overloaded

C.will burn out when an over current flow develops

D.should short the circuit when overloaded

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第4题

Fuses placed in series with a thermal trip-type circuit breaker are used for _____.A.time-

Fuses placed in series with a thermal trip-type circuit breaker are used for _____.

A.time-delay protection

B.short-circuit protection

C.short duration surge protection

D.sustained overload protection

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第5题

When securing an AC generator, you should FIRST _____.A.open the generator circuit breaker

When securing an AC generator, you should FIRST _____.

A.open the generator circuit breaker

B.switch the voltage regulator to "manual"

C.decrease the field excitation to minimum

D.reduce the load on the unit

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第6题

Before any work on electrical or electronic equipment is performed, which of the following

precautions should be carried out _____.

A.De-energize the applicable switchboard bus

B.Bypass the interlocks

C.Secure and tag the supply circuit breaker in the open position

D.Station a man at the circuit supply switch

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第7题

An alternator is being paralleled with one on the line At the instant the circuit breaker

is close, the frequency of the incoming alternator will normally

A.increase

B.not change

C.decrease

D.be exactly 60 hertz

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第8题

A ground in an electrical circuit outside the engine room _____.A.cannot be detected tinde

A ground in an electrical circuit outside the engine room _____.

A.cannot be detected tinder normal conditions

B.is of no consequence to engineering personnel

C.is indicated at the branch circuit breaker panel

D.is indicated by the ground detecting lamps on the main switchboard

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第9题

If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilg

es, you would check for all of the following EXCEPT _____.

A.the circuit breaker

B.for leaks in the suction piping

C.relief valve .is not properly seated

D.the suction strainer

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第10题

If the electric motor driving an air compressor fails to start, the cause may be a _____.A

If the electric motor driving an air compressor fails to start, the cause may be a _____.

A.leaking unloader

B.tripped circuit breaker

C.control line leak

D.defective pop valve

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