If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

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• Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

  A . reciprocating B . rotating C . running D . removing

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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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• The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）

  A . Cross B . Parallel C . Counter D . Circular

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• If the temperature drops low enough, oil will not flow, （） just tell us the temperature.

  A . Hash point B . Viscosity C . Pour point D . Cetane number

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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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• Ambient temperature is the （）.

  A . amount of temperature rise with no load B . temperature of the compartment where the motor is located C . normal operating temperature, less the room temperature D . amount of temperature developed by an operating motor

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• Engine coolant accumulating in the diesel engine lubricating oil can result from a （）

  A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

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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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• Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.

  A . the more B . the higher C . the lower D . the highest

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• The (auto)ignition temperature is that temperature atwhich（）.

  A . no spark or flame is required to ignite gas or vapor B . a fuel begins to give off explosive vapors C . a fuel if ignited will continue to burn D . a 1% mixture of the fuel with air will explode

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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 temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.

  A . 8-10℃ B . 10-12℃ C . 10-15℃ D . 10-20℃

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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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• 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 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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• 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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• 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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• When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be （）.

  A . dry B . wet C . super-cooled D . superheated

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• . The temperature today is about 68 degrees. That's the temperature in ______________.

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• （In) warm-blooded animals, their body temperature, regardless of the temperature of the an

  (In) warm-blooded animals, their body temperature, regardless of the temperature of the animals' (surroundings), (are) maintained within narrow (limits). A．In B．surroundings C．are D．limits

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• – What’s the temperature today –（) .

  A.Nice and cool B.The weather forecast says it’s fine C.About 18 degrees D. Sure, it’s sunny

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• What will you say if the guest tells you the temperature in the private roomis too low？

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• The （） the temperature, the greater the retardation of food degradation

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