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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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If a person is unconscious from electric shock，you should first remove him from the electrical source and then（）.
A . administer ammonia smelling salts
B . check for serious burns on the body
C . determine if he is breathing
D . massage vigorously to restore circulatio
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An electric heater built into some smaller diesel engines is used to （）.
A . raise lube oil viscosity for easier starting in cold weather
B . increase air inlet temperature
C . increase compression ratio
D . increase jacket water temperature for easier starting in cold weather
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The （） is a crystal which, under pressure, produces an electric current which varies with the pressure.
A . alternator
B . glass thermometer
C . burdon tube
D . piezoelectric pressure transducer
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Insulation light is located on.（） of main switchboard.
A . Paralleling panel
B . Load panel
C . Emergency generator control pane
D . Main generator control pane
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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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The old lady is quarrelling with others as if she（）mad.
A . was
B . is
C . are
D . were
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Most often （） is attached to the engine-propeller shaft for efficient electric power generation.
A、An alternator
B、An electric motor
C、A diesel engine
D、A main switchboard
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Which of the following materials is a good insulator?（）
A . steel
B . aluminum
C . glass
D . copper
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When there is a fire in a large electric motor, normally the very FIRST step is to （）
A . secure the electric supply
B . ventilate area to remove smoke
C . start the fire pump and lead out hose
D . apply foam
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（） is used to produce electric power.
A、The generator and bus transfer section.
B、The 450 volt, 60 cycle, 3 phase bus.
C、The 120 volt, 3 phase, 60-cycle bus.
D、The 24 volt DC bus.
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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 terrible noise is（）me mad.
A . turning
B . setting
C . driving
D . putting
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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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What type of electric motor is most commonly used on board ship?（）
A . non-synchronous electric motor
B . synchronous electric motor
C . fully enclosed electric motor
D . watertight electric motor
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In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）
A . Hard rubber
B . Canvas
C . Leather
D . Sponge rubber
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If we want to buy furniture or electric appliances, which one is the reasonable choice?
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It is Aristotle who called Diogenes “a Socrates gone mad”.
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The electric wires in a house____with some kind of insulation.
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The room’s insulation is too bad. 这句话的 的意思是 _____ 。
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What are we told is the best way to avoid hubris-fueled merger madness？
A．Draw lessons from past merger decisions.
B．Trust those who share opinions with you.
C．Stay far away from merger activities.
D．Try to accept opposing views.
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There is an electric fire. Get the ________ extinguisher.
A.foam
B.water
C.dry powder
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It is well known tht Toms Edison ______ the electric lmp.discoveredB．foundC．developedIt is well known tht Toms Edison ______ the electric lmp.discovered B．found C．developed D．invented
A．discovered
B．found
C．develope
D．invented
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Johnson Electric（强生电器公司) is located in Hong ...
Johnson Electric(强生电器公司) is located in Hong Kong and is a multinational enterprise(跨国企业) and world leader in the design, development and delivery of micro-motors and integrated motor(集成电机) systems. Listed in Hong Kong Stock Exchange, we have principal subsidiaries(分公司) in 14 countries and over 30,000 employees worldwide. Currently with the rapid growth of the company and continuous improvement in technology, we are striving to become the world-class provider in this industry.
