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While on watch,you notice that the air temperature is dropping and is approaching the dew point.Which type of weather should be forecasted().
A . Hail
B . Heavy rain
C . Sleet
D . Fog
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If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST ()
A . place standby cooler in operation
B . reduce engine load
C . check thermostatic valve
D . clean sea water strainer
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If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be ()
A . a dirty lube oil strainer
B . internal water leaks
C . an oil suction line restriction
D . excessive wears of the cooling water pum
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If a diesel engines exhaust temperature is abnormally high, the cause could be()
A . too light of a load
B . injection timing is too early
C . overloading of the engine
D . too low of a compression ratio
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For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has().
A、Drum.
B、Salient pole.
C、Squirrel-cage.
D、Wound-rotor.
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In the Northern Hemisphere,gusty winds shifting clockwise,a rapid drop in temperature,thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies,indicate the passage of a(n)() .
A . warm front
B . tropical cyclone
C . anticyclone
D . cold front
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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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The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the ().
A . turbocharger stalls
B . exhaust pressure increases
C . air charge density decreases
D . scavenge effect increase
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If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an ()
A . cavitation erosion in the water jackets
B . excess corrosion inhibitor in the coolant
C . dirty jacket water cooler
D . defective turbocharger
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How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has not yetcompleted?()
A . Issue the ALTER DISKGROUP ... ADD DISK command.
B . Issue the ALTER DISKGROUP ... UNDROP DISKS command.
C . Issue the ALTER DISKGROUP ... DROP DISK CANCEL command.
D . Retrieve the disk from the Recycle Bin after the operation completes.
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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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During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should ()
A . notify the duty officer, reduce the engine speed, take some measures to remove failures
B . notify the duty officer and stop the engine immediately, find the cause and remove failures
C . notify the C/E
D . notify the captai
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If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is ()
A . a broken shaft on the freshwater pump
B . an excessive accumulation of scale exchanger
C . an incorrect thermostatic element operating range
D . lube oil in the cooling water
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If the temperature in the icebox is too high, the trouble could be()
A . a clogged scale trap
B . air in the system
C . automatic controls not functioning properly
D . insufficient cooling water to the condenser
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How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has already completed?()
A . Issue the ALTER DISKGROUP ... ADD DISK command.
B . Issue the ALTER DISKGROUP ... UNDROP DISKS command.P.... DROP DISK CANCEL command.
C . Issue the ALTER DISKGROU
D . Retrieve the disk from the Recycle Bin after the operation completes.
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If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the ().
A . compression pressures are below normal
B . lube oil is diluted with fuel oil
C . cranking speed is too low
D . exhaust system is partially restricted
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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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How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has alreadycompleted?()
A . Issue the ALTER DISKGROUP ... ADD DISK command.
B . Issue the ALTER DISKGROUP ... UNDROP DISKS command.
C . Issue the ALTER DISKGROUP ... DROP DISK CANCEL command.
D . Retrieve the disk from the Recycle Bin after the operation complete
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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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The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the _____.
A.turbocharger stalls
B.exhaust pressure increases
C.air charge density decreases
D.scavenge effect increases
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The temperature of the world in the past ten years has dropped a little______.
A.because wind and rain changed the weather
B.the drop in the temperature would have effects on wind and rain
C.because wind and rain did not change the weather
D.the drop in the temperature would not have effects on wind and rain
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At night the desert floor radiates heat back into the atmosphere and the temperature may be drop to near freezing.
此题为多项选择题。
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Some doctors are worried about the danger of a condition ______ the bodys temperature drops so low that finally the heart stops.
A.in that
B.so that
C.except that
D.in which
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What will you say if the guest tells you the temperature in the private roomis too low?