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[主观题]

As a general rule, the first troubleshooting action to be taken in checking faulty electri

c control devices is to _____.

A.draw a one line diagram of the circuitry

B.test all fuses and measure the line voltage

C.take megger readings

D.insulate the apparatus from ground

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第1题

The sub-multiple prefix “micro” means _____.

A.thousandth ( 10 to the - 3rd power)

B.millionth (10 to the -6th power)

C.billionth ( 10 to the - 9th power)

D.trillionth (10 to the - 12th power)

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第2题

If you must make an electricity connection in a poorly accessible spot, solder it and seal it against ____.

A.metal

B.wood

C.water

D.plastic

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第3题

In a diesel engine, a cylinder liner should be replaced if it is ___________ⅠScuffed ⅡScored

A.I only is correct

B.Ⅱ only is correct

C.both I and Ⅱ are correct

D.neither I or Ⅱ are correct

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第4题

If the head pressure is too high, .

A.the relief valve should open before the high-pressure cutout

B.the relief valve should open and let excess refrigerant go to receiver

C.the high-pressure cutout switch should operate before the relief valve opens

D.close in on the suction valve

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