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提问人：网友huangchuyan 发布时间：2022-01-06

[主观题]

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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更多“A circuit breaker and a fuse have a basic similarity in that they both______.A.can be rese”相关的问题

第1题

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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第2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3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4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5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6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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第7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8题

You are attempting to parallel two AC generators and the synchroscope pointer is revolving

in the slow direction. This indicates that the frequency of the incoming machine is

A.higher than the bus frequency

B.lower than the bus frequency

C.file same as file bus frequency but out of phase with it

D.the same as the bus frequency, and the circuit breaker may be closed at nay pointer position

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第9题

If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an ov

erload safety device causes a circuit breaker to cut off the current to the winch motor ______．

A.when the line pull reaches the rated winch capacity

B.after the line pull exceeds the rated winch capacity

C.after a short build-up of torque

D.immediately

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第10题

如果在线路图上知道了部件的设备号,在WDM上如何查找其件号？

A、在Equipment list中可找到

B、在Wire list中可找到

C、在Circuit breaker list中可找到

D、以上都不对

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