An outside air pressure decreases, thrust output will

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  A . scavenging B . starting C . cooling D . blowing

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• By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.

  A、rotary compressors B、reciprocating compressors C、centrifugal compressors D、screw compressors

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• In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

  A . Differential B . Trunk C . Barrel D . Valve-in-head

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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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• Compared to a low pressure system，generally the air in a high is（）.

  A . warmer，less dense，and less stable B . cool，more dense，and drier C . muggy and cloudy D . extremely moist with high relative humidity

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• On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.

  A . splash method B . mechanical force feed lubricators C . detached sump method D . internal cooling passages in the crankshafts and connecting rod

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• The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）

  A . inlet nozzle ring B . turbine wheel blade C . diffuser passages D . inlet vol

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• The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

  A、one valve seats upwards, while the other seats downwards B、the reed valves used on the discharge are made substantially thicker and heavier than thesuction valves C、the suction valve springs exert a greater tension than the discharge valve springs D、the discharge valve springs exert a greater tension than the suction valve springs

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• Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

  A . nuts and bolts B . new joints C . spring force D . sealing ring

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• When the dew point of the outside air is lower than or equal to the dew point of the air in the cargo hold，you should（）.

  A . secure all ventilation B . shut down the exhaust blowers C . shut down the intake blowers D . ventilate the cargo hold

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• The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

  A . the cylinder head B . the cross-head C . the moving piston D . the stationary pisto

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• The pressure of pilot air is usually （） than that of starting air.

  A . higher B . lower C . low D . high

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• A ground in an electrical circuit outside the engine room （）.

  A . cannot be detected tinder normal conditions B . is of no consequence to engineering personnel C . is indicated at the branch circuit breaker panel D . is indicated by the ground detecting lamps on the main switchboard

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• Charging-air pressure increases if there is incorrect combustion and drop in the （） of the diesel engine.

  A . machine efficiency B . machinery efficiency C . mechanical efficiency D . mechanics efficiency

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• The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

  A . has begun B . takes place C . occurs D . happe

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• Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）

  A . Excessive piston blow-by to the manifold B . Insufficient cooling water flow C . Accumulated water in the air boxes D . Clogged air intake filter

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• Which of the listed devices would be installed at a control system air pressure reducing station?（）

  A . Moisture separator B . Vacuum breaker C . Lubricator D . Non-return valve

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• Broken valve strips in an operating low pressure, air compressor will cause （）.

  A、an immediate crankcase explosion B、oil contamination in the compressed air C、a decrease in compressor capacity D、no immediate loss of the compressed air capacity

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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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• 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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• 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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• Most of us require an environment________outside distraction.

  A、free of B、free from C、free away D、free without

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• The outside air's temperature determines the amount of extra heating needed in the ripening room.

  A．Y B．N C．NG

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• Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outside.

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