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

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• In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）

  A . noise coming from that air starting valve B . continuous operation of the starting air compressor C . zero air pressure in the air starting system D . overheated starting air pipe to the cylinder head

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• The purpose of the deck seal in an inert gas system is to prevent（）.

  A . flammable vapors from entering machinery space B . flue gas escaping to atmosphere C . inert gas escaping to atmosphere D . air entering inert gas system

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• The purpose of the stripping bar on an anchor windlass is to（）.

  A . clean off any mud that may have accumulated on the chain B . engage or disengage the wildcat C . fairlead the chain from the hawse pipe to the wildcat D . prevent the chain from fouling the wildcat

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• Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）

  A . Cooling the air to a temperature just above dew point B . Heating the air to a point at which moisture will boil off ,then re-cooling it C . Cooling the air to a point below dew point, then reheating it D . Heating the air and then cooling it to a point below dew point

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• The air spaces in the floor of an inflatable liferaft will provide protection against（）.

  A . asphyxiation from CO B . loss of air in the sides of the raft C . rough seas D . cold water temperature

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• The purpose of compressing the air within the cylinder of a diesel engine is to （）

  A . produce the heat for ignition B . decrease injection lag C . increase ignition delay D . aid in exhausting burnt gase

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• What is the purpose of an explicit "deny any" statement at the end of an ACL？（）

  A . none，since it is implicit B . to enable Cisco IOS IPS to work properly；however，it is the deny all traffic entry that is actually required C . to enable Cisco IOS Firewall to work properly；however，it is the deny all traffic entry that is actually required D . to allow the log option to be used to log any matches E . to prevent sync flood attacks F . to prevent half-opened TCP connectio

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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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• Which of the following statements describes the function of an air compressor intake filter?（）

  A . Protects against suction valve float B . Provides a positive pressure on the air inlet valves C . Prevents lubricating oil contamination of the compressed air supply D . Protects against the damaging effects of airborne solid particle

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• The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.

  A . balance B . not balance C . be more than D . be less tha

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• For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）

  A . Chilled water system supply temperature B . Chilled water system return temperature C . Compressor discharge temperature D . Compressor suction pressure

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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 purpose of the safety relief valves installed on an auxiliary boiler is to （）.

  A . relieve excess fuel oil pressure during the “off” fire cycle B . admit water to the dry pipe C . throttle the forced draft fan output for proper combustion D . reduce excess steam pressure in the boiler

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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 main purpose of starting the diesel engine on air briefly is（）

  A . to inspect if the cylinder has the water leakage B . to expel out the residual water/gas/oil from the cylinder C . to check if fuel supply is normal D . A and B

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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 purpose of the “set” hand on an aneroid barometer is to（）.

  A . adjust the barometer B . indicate any change in the reading of the barometer C . provide a correction for height above sea level D . provide a correction for temperature change

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• What is the purpose of assigning an IP address to a switch?（）

  A . Provides local hosts with a default gateway address B . Allows remote management of the switch. C . Allows the switch to respond to ARP requests between two hosts D . Ensures that hosts on the same LAN can communicate with each other.

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• Which of the following best describes the purpose of using lifecycle services for deploying an advanced wireless solution？（）

  A . create a more effective sales strategy for partners. B . reinforce customer confidence in partners selling products. C . provide a consistent， repeatable， and proven method to ensure the network solution that is deployed delivers upon the customer’s goals for reliability and availability. D . maximize the number of services required to support advanced technologies. E . more clearly define the roles of account managers， systems engineers， and field engineers.

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• The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）

  A . cool the furnace to prevent pre-ignition B . remove explosive vapors from the furnace C . evaporate accumulated unburned fuel oil D . provide sufficient air in the furnace to allow ignition of the fuel

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• Which one of the following items is NOT a main purpose of an analogy?

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• What is the purpose of an argumentative essay? ( )

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• The purpose of writing an argumentative essay is to determine the degree of ______ of a conclusion.

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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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