單項(xiàng)選擇題Electrical circuits are protected against overheating by means of a/an （）.

A.circuit breaker
B.amplifier
C.diode
D.capacitor


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1.單項(xiàng)選擇題Routine maintenance of lead acid batteries should include （）.

A.keeping the terminals clean
B.coating cable connections with petroleum jelly
C.maintaining a trickle charge
D.All of the above

2.單項(xiàng)選擇題Under which of the listed conditions can the engine room retake the throttle control from the bridge（）.

A.Any time it is deemed necessary
B.Only with the masters permission
C.After a 10 minute delay to the input command
D.Only after the throttle has been placed in stop

3.單項(xiàng)選擇題Copper is often used as an electrical conductor because it （）.

A.has high resistance at low temperatures
B.has a highly polished surface
C.is able to pass current with little opposition
D.holds insulation together well

4.單項(xiàng)選擇題A device which prints out a permanent record of the plant operating conditions is known as the （）.

A.analogger
B.bell logger
C.alarm logger
D.data logger

5.單項(xiàng)選擇題Which of the following types of motors is often designed for use in correcting power factor?（）

A.Polyphase
B.Wound-rotor
C.Induction
D.Synchronous