Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

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  A . Ball float B . Thermostatic C . Bimetallic D . Impulse

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  A . suction pressure only B . head pressure only C . superheat only D . suction pressure and box temperature

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• A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.

  A . open B . close C . remain in its position D . flood the evaporator with refrigerant

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• Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）

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• Steam的中文是（）。

  A . 蒸 B . 温煮 C . 沸煮 D . 焖

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• A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

  A . around the engine B . around the cooler C . to the expansion tank D . overboard

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• In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

  A . steam stop valve B . dry pipe C . feedwater system D . generating tube

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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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• （）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.

  A . An economizer B . An attemperator C . A water dram D . A down-comer tube

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• The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.

  A . the former B . the first C . the latter D . the last

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• A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.

  A . evaporator pressure decrease B . evaporator coil over-feed C . evaporator capacity increase D . expansion valve diaphragm rupture

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• A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.

  A . return to a neutral position B . flood the evaporator C . open D . close

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• Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.

  A . cast iron has weakness B . cast iron can stand up shock loading C . cast iron fittings are only suitable in low pressure situation D . east iron fittings are not suitable in low pressure situatio

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• Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）

  A . At the designed operating temperature, the liquid refrigerant charge has changed to a vapor B . The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity C . The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature D . The sensing bulb is never emptied of liquid refrigerant under normal operating conditio

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• As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure

  A . （1） B . （1）and（2） C . （2） D . neither（1）nor（2）

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• As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: (1) secure oil to fires; (2) increase feed pump pressure.

  A.(1) B.(1) and (2) C.(2) D.neither (1) nor (2)

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• 9、STEAM教育所包含的学科有（）。

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