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To extinguish an electrical fire, you should use ().
A . mechanical foam
B . chemical foam
C . carbon dioxide
D . soda acid
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Inductance is the property of an electric circuit that ()
A、opposes any change in the applied voltage
B、opposes any change in the current flow through the circuit
C、aids any changes in the applied voltage
D、aids any changes in the current through the circuit
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When would you ground an electric hand tool?()
A . When it is a DC machine
B . When it is an AC machine
C . Any machine that operates on over 100 volts
D . Only when working on wet steel plate
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Electric circuits are protected against overloads and short circuits by means of a/an ().
A . circuit breaker
B . amplifier
C . diode
D . capacitor
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Static electricity may be built up by the().
A . flow of petroleum through pipes
B . spraying or splashing of petroleum
C . settling of solids or water in petroleum
D . All of the above
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When is an IPSec SA built on the Teleworker Router?()
A . when the router is booted up
B . when the router administratively does a no shutdown" on the IPSec SA
C . when traffic matches a line of the access-list tied into the crypto-map in the router configuration, and that particular IPSec SA is not already up
D . when the ISAKMP SA completes negotiation of all IPSec SAs (one per access-list line in the crypto ACL), it will be brought up immediately
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The backup system on an electric start survival craft is a().
A . hydraulic system
B . pneumatic system
C . spare battery
D . hand crank
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A fire in an electrical generator is considered to be ().
A . Class "A"
B . Class "B"
C . Class "C"
D . Class "D"
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(),as the chemical extinguisher agent,should be used for an electric fire.
A . dry chemical or foam
B . foam or soda acid
C . carbon dioxide or foam
D . carbon dioxide or dry chemical
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Overspeed of the diesel engine driving an electric generator could cause().
A . low voltage trip
B . reverse power trip
C . damage to windings
D . excessive exhaust temperature
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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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A transformer in an electric circuit serves to ()
A . generate its own electrical power
B . transform electrical energy into mechanical energy
C . increase or decrease circuit voltage as required
D . convert AC current to DC current
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The primary function of an electric motor is to ()
A . develop torque
B . generate high voltages
C . produce a magnetic field
D . generate high electrical resistance
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The main purpose of an electric space heater installed in a large AC generator is to ()
A . prevent the windings from becoming brittle
B . prevent moisture from condensing in the windings during shutdown
C . prevent acidic pitting of the slip rings
D . keep the lube oil warm for quick starting
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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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When a rescuer finds an electrical burn victim in the vicinity of live electrical equipment or wiring,his first step is to().
A . flush water over any burned area of the patient
B . apply ointment to the burned areas on the patient
C . get assistance to shut down electrical power in the area
D . remove the patient from the vicinity of the live electrical equipment or wiring
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To assist separation of low viscosity oils steam coils or electric heaters are fitted () of the oily water separator.
A . in entrance
B . in exit
C . in the upper part
D . on the outside
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The overspeeding of the diesel engine driving an electric generator could cause ().
A . low voltage trip to trip
B . reverse power trip to trip
C . damage to windings
D . excessive exhaust temperature
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Australia was built from an overseas penal colony of the British Empire.
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听力原文:M: It's so cold today. I cannot work any longer. I really hope there's a heater in this room.
W: So do I. I think I will freeze if I stay longer.
What are they talking about?
A.The heater of this room.
B.The cold weather.
C.Long working hours.
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There is an electric fire. Get the ________ extinguisher.
A.foam
B.water
C.dry powder
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Engineering students are supposed to be examples of practicality and rationality, but when it comes to my college education I am an idealist and a fool. In high school I wanted to be an electrical engineer and, of Course, any sensible student with my aims would have chosen a college with a large engineering department, famous reputation and lots of good labs and research equipment. But that's not what I did.
I chose to study engineering at a small liberal-arts university that doesn't even offer a major in electrical engineering. Obviously, this was not a practical choice; I came here for more noble reasons. I wanted a broad education that would provide me with flexibility and a value system to guide me in my career. I wanted to open my eyes and expand my vision by interacting with people who weren't studying science or engineering. My parents, teachers and other adults praised me for such a sensible choice. They told me I was wise and mature beyond my 18 years, and I believed them.
I headed off to college, feeling sure I was going to have an advantage over those students who went to big engineering "factories" where they didn't care if you had values or were flexible. I was going to be a complete engineer: technical genius and sensitive humanist all in one.
Now I'm not so sure. Somewhere along the way my noble ideals crashed into reality, as all noble ideals eventually do. After three years of struggling to balance math, physics and engineering courses with liberal arts courses, I have learned there are reasons why few engineering students try to reconcile engineering with liberal-arts courses in college.
The reality that has blocked my path to become the typical successful student is that engineering and the liberal arts simply don't mix as easily as I assumed in high school. Individually they shape a person in very different ways; together they threaten to confuse. The struggle to reconcile the two fields of study is difficult.
The author chose to study engineering at a small liberal-arts university because he ______.
A.intended to be a sensible student with noble ideals
B.wanted to be an example of practicality and rationality
C.intended to be a combination of engineer and humanist
D.wanted to coordinate engineering with liberal-arts courses in college
此题为多项选择题。
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I have certainly seen lots of changes in my lifetime! I look around my home and see "mod cons" that I could never have dreamed of 50 or 60 years ago. I spent the early part of childhood in a cottage without running water or electricity and yet these days, I feel paralyzed if there is a power cut for even just an hour or two! So, I have changed too. Things that I couldn't even imagine in the past now seem quite normal.
Businessmen can travel from London to New York in three hours and lots of people exceed the seventy-mile-per-hour speed limit on motorways. A person of 75 is not old these days. A serious illness does not mean certain death because there have been so many advances in medical science. We no longer need to be afraid of contracting diseases like polio or smallpox. I can speak to my son in Australia from my own sitting room here in Manchester, watch athletes running a race on the other side of the world without moving from my own home and I can even do my shopping while I sit here in an armchair. I never need to worry about food going bad in the warm weather and, at the flick of a switch, I can have a hot meal in a couple of minutes. So, it seems, the quality of life has greatly improved since my own childhood.
I'm not convinced, however, that people are happier today than they were 50 years ago. We are certainly materially better off than we were but most people still seem to be weighed down by problems. My daughter and her family are a good illustration. They have a spacious, comfortable home with every labor-saving device you can think of. There's a washing machine, a clothes dryer, a food processor, a vacuum cleaner and all sorts of other household items which are designed to save time but it seems to me that my daughter and her husband just spend all that "saved" time working! They never relax and are always complaining of being tired and "stressed".
What is the passage mainly about?
A.How life has improved.
B.How life has become worse.
C.A comparison of life now and that in the past.
D.Memory of life in the past.
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If the guest wants to loan a electric heater what would you like to do ?