Air entering an air-cooled refrigeration system is indicated by （）.

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• Open the （）before starting an air compressor.

  A . unload valve B . cooling water C . oil cup D . sum

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• An indication of a diesel engine air intake being partially clogged, is （）.

  A . low firing pressure and low exhaust temperatures B . low firing pressure and normal exhaust temperatures C . high firing pressure and low exhaust temperatures D . high firing pressure and high exhaust temperature

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• Before entering an ice area，the ship should be（）.

  A . either trimmed by the head or the stern B . on an even keel C . trimmed down by the head D . trimmed down by the ster

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• In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

  A . downwards；upwards B . upwards；downwards C . downwards；downwards D . upwards；upward

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• An air mass is termed warm if（）.

  A . it is above 70°F B . the ground over which it moves is cooler than the air C . it originated in a high pressure area D . it originated in a low pressure area

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• Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.

  A . Orsat apparatus B . flame safety lamp C . Halide torch D . combustible gas indicator

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• The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）

  A . system is overcharged with refrigerant B . system is low on refrigerant C . discharge valves are leaking excessively D . discharge valves are leaking slightly

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• The purpose of an air compressor unloading device is to （）

  A . drain water from the air receiver B . drain water from the cylinders C . delay the compression process until the motor is up to speed D . check pump alignment

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• When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）

  A . suction stroke B . compression stroke C . power stroke D . exhaust stroke

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• As the temperature of an air mass decreases，the（）.

  A . absolute humidity decreases B . relative humidity increases C . specific humidity decreases D . dew point rise

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• Before starting an air compressor, It should be （）.

  A . unloaded B . primed C . filled with water D . greased

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• Before starting an engine by air, the engine must（）

  A . be turned by a turning gear for at least one minute B . be turned by a turning gear for at least two minutes C . be turned at least one complete turn D . be turned at least two complete tur

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• In an air conditioning system, moisture is removed from the air by（）

  A . filers B . separators C . ducted traps D . dehumidifier

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• The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.

  A、superheated B、super-cooled C、at or below the dew point D、All of the above

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• The unloading system on an air compressor will （）.

  A . increase compressor discharge pressure on demand B . increase compressor operating speed as necessary C . allow the motor to turn the compressor opposed only by friction D . reduce the compressor frictional load when starting

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• Air blowing from the intake air filter of an operating air compressor indicates （）.

  A、broken inlet valves B、broken discharge valves C、pulsations in the air distribution system D、overloading of the air distribution system

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• How does combustion air enter the cylinder of a two-cycle diesel engine?（）

  A . Cylinder head valves B . Ports C . Turbo chargers D . Bleeder valve

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• The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.

  A、lubricating oil B、compressed air C、cooling water D、sealing ring

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• The starting air entering the cylinder begins when the piston（）

  A . has nearly come to the TDC B . has just past the TDC C . has nearly come to the BDC D . has just past the BDC

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• What information should we offer when we reserve an air ticket?

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• Without a competitive assessment, sales estimate can be misleadingly optimistic, especially where an organization is entering an established competitive market.

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• You are in a tropical port．The refrigeration machinery on a container loaded with air-cooled fruit fails．It cannot be repaired for 18 to 24 hours．Which step should you take to reduce the temperature rise and spoilage of the fruit ________．

  A.Discharge a cylinder of nitrogen into the container B.Shade the container and periodically hose it down C.Seal any ventilation openings and add dry ice D.Spread ice over the top layer and in any voids within the container

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• If an aircraft dispatcher cannot communicate with the pilot of an air carrier flight during an emergency, the aircraft dispatcher should

  A、Take any action considered necessary under the circumstances. B、Comply with the company’s lost aircraft plan. C、Phone the ARTCC where the flight is located and ask for a phone patch with the flight.

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• An outside air pressure decreases, thrust output will

  A、Increase due to greater efficiency of jet aircraft in thin air B、Remain the same since compression of inlet air will compensate for any decrease in air pressure C、Decrease due to higher density altitude

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