海船船员适任证书三管轮模拟试题2(轮机英语)
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Complete maintenance of electrical motors should include periodic checks for machine _____.
- A.vibration
- B.watertight integrity
- C.speed droop
- D.reactive power
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A propeller of 5.65m in diameter, having a mean pitch of 4.88m, turning at 72 rpm, at a speed of 11 knots (339.79m/min), will give _____ of apparent slip.
- A.0.967
- B.0.033
- C.0.031
- D.0.969
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When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent _____.
- A.air from contacting the oil vapors
- B.permitting re-ignition boiling of the heated oil
- C.spontaneous combustion below the oil surface
- D.toxic fumes from escaping to the surface
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Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to _____.
- A.temperature
- B.pressure
- C.engine speed
- D.all of the above
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A feeler or thermal bulb is used for the expansion valve to _____.
- A.detect the temperature
- B.detect the pressure
- C.heat the refrigerant
- D.accelerate the refrigerant
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The data to be recorded on this sheet _____ the performance of the engine.
- A.makes the experts to judge
- B.enables the experts to judge
- C.make the experts judging
- D.enable the experts to judge
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The fuel is supplied to the pump through ports or openings in the _____ or cylinder of the pump.
- A.bottle
- B.injector
- C.piston
- D.barrel
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We should apply for annual spare parts according to____Ithe need of annual overhaul IIthe storage of spare parts IIIthe storage capacity of spare parts room
- A.I
- B.II
- C.I + II
- D.III
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The sub-multiple prefix “nano” (n) 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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Excessive vibration of an automatically fired auxiliary boiler can be caused by _____.
- A.air or water in the furnace
- B.combustion pulses
- C.fuel oil pump failure
- D.flame failure
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