If a compressor runs continuously, the cause might be a（）

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• If the head pressure of a reciprocating refrigeration compressor is excessive, （）.

  A . the relief valve should open before the high pressure cutout B . the relief valve should open and allow the excess refrigerant to flow to the receiver C . the high pressure cutout switch should operate before the relief valve opens D . you should close in on the suction valve

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• A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.

  A、compressor is overloaded B、motor is overloaded C、foundation bolts are loose D、belts are too tight

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• How can the system administrator determine if a system is running in 32-bit or 64-bit mode？（）

  A . Use ’prtconf -c’ to see if the system is 64-bit enabled B . Check the /etc/inittab to see if /etc/method/cfg64 is enabled C . Use the ls -al to see if /unix is linked to /usr/lib/boot/unix_64 D . Use the lslpp command to see if the bos.mp64 fileset is installed

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• If the electric motor driving an air compressor fails to start, the cause may be a （）.

  A . leaking unloader B . tripped circuit breaker C . control line leak D . defective pop valve

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• If a refrigeration compressor will not start, the reason may be （）.

  A . the pressure regulating valve is not closing B . an excessive lack of refrigerant in the system C . badly leaking discharge valves D . worn piston ring

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• If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.

  A . system was overcharged with refrigerant B . high pressure switch was improperly adjusted C . expansion valve strainers were fouled D . suction valves were leaking slightly

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• Companycom has a system running AIX 5.2 and wants to upgrade to AIX 5.3. What method would provide the quickest recovery if the upgrade failed?（）

  A . Use alt_disk_install B . Backup image to NIM server C . Backup using mksysb to DVD-RAM D . Apply the upgrade and do not commit

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• How can a system administrator determine if a system is running in 32-bit or 64-bit mode（）

  A . Use the Is -al to see if/unix is linked to /usr/lib/boot/unix_64 B . Check the /etc/inittab to see if there is a load64bit entry C . Use ’prtconf -c1 to see if the system is 64-bit enabled D . Use the Islpp command to see if the bos.mp64 fileset is installed

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• If a refrigeration compressor is short cycling on high head pressure, you should （）.

  A . purge the condenser if the waterside is dirty B . check for proper water flow through the condenser C . increase the high pressure cutout setting D . reduce the cooling water flow

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• If you are going to run a TSPITR recovery， which view will help you to determine which objects will be lost during the TSPITR？（）

  A .  TS_OBJECTS_TO_BE_DROPPED B .  TS_PTTR_OBJECT_DROPPED C .  TS_PITR_OBJECTS_TO_BE_DROPPED D .  TS_OBJECTS_DROPPED E .  TS_DROPPED_OBJECTS

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• If the refrigeration compressor crankcase is sweating, the cause may be due to （）.

  A . a shortage of refrigerant B . the compressor running continuously C . liquid refrigerant returning to the compressor D . the compressor short cycling on the high pressure cutout

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• If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.

  A、combustion control air system B、supply air system C、ships service air system D、low pressure deck air system

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• If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

  A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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• If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）

  A . Fuel B . Lubricating C . Cooling D . Ignitio

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• If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

  A . 525 RPM B . 775 RPM C . 1550 RPM D . 1800 RPM

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• If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.

  A . increase the flow of the cooling water through the condenser B . adjust the high pressure cutout to maintain the desired pressure C . open the hot gas bypass temporarily to reduce capacity D . purge non-condensable gases to reduce the excess pressure

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• You are running parallel to the coast and take a running fix using bearings of the same object.If you are making less speed than used for the running fix，in relation to the position indicated by the fix，you will be（）.

  A . Closer to the coast B . Farther from the coast C . On the track line ahead of the fix D . On the track line behind the fix

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• Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）

  A . Excessive compression in the cylinder B . A broken intake valve C . A dirty inlet filter element D . An improperly adjusted discharge valve

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• If a system administrator wants to show only a disk report for disk2, at two second intervals, what is the correct command to run?（）

  A .  iostat disk1 1  B .  iostat -d disk1 2  C .  iostat disk2 1  D .  iostat -d disk2 2

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• If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be （）.

  A . excessive condenser cooling water B . warm food in the refrigerator C . a shortage of refrigerant D . s shortage of compressor oil

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• If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.

  A . system was overcharged with refrigerant B . system was low on refrigerant C . suction valves were leaking slightly D . relief valve was leaking slightly

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• If the compressor-discharge temperature is higher than the receiver temperature（）

  A . increase the amount of cooling water to the condenser B . decrease the amount of cooling water to the condenser C . add more refrigerant to the system D . remove some of the refrigerant from the system

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• If a diesel engine were running at 20% overload with a smoky exhaust, you should_____.

  A.stop the engine immediately to prevent damage B.increase lube oil pressure C.slow the engine allowing it to gradually cool D.decrease the cooling water it temperature to the water jacket

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• If you intend to melt the snow for drinking water, you can__extra purity by running it through a coffee filter.

  Aassure Binsure Creassure Densure

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