The thermal expansion valve responds to the（）

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• Thermostatic expansion valves can be adjusted for （）.

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

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• The expansion valve on a Freon system controls the （）.

  A . superheat of the gas leaving the compressor B . back pressure in the evaporator C . temperature of the icebox D . superheat of the gas leaving the evaporator

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• If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.

  A . increase the capacity of the coil B . increase the superheat at the bulb C . deliver more refrigerant to the coil D . decrease the capacity of the coil

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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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• Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）

  A . Lube oil passing through the system B . Moisture or foreign matter collecting at the valve seat and orifice C . Variable spring tension caused by the changing temperature D . Frost on the liquid line

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• A feeler or thermal bulb is used for the expansion valve to （）.

  A . detect the temperature B . detect the pressure C . heat the refrigerant D . accelerate the refrigerant

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• The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

  A . be jammed B . be opened C . be seated D . be broke

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• Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

  A . closing later B . opening sooner C . staying open for a shorter period of time D . staying open for a longer period of time

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• The rate of expansion of heated fuel oil varies with the （）.

  A . conductivity B . viscosity C . volume D . specific gravity

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• （） allows for expansion and water make up in the water cooling system.

  A . A top tank B . A head tank C . A head valve D . A drain tank

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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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• The bulb for the thermal expansion valve is located（）

  A . in the middle of evaporator coils B . near the evaporator coil outlet C . near the evaporator coil inlet D . on the bottom row of evaporator coil

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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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• 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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• When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will（）.

  A . always be wide open when the compressor restarts B . continue to operate as if the system were in operation C . remain open until evaporator pressure equalizes, then close until the compressor restarts D . always be completely closed until the compressor restart

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• The movement of heat within a fluid, caused by the application of thermal energy, is called （）.

  A . radiation B . conduction C . convection D . condo-radiatio

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• The purpose of treating the cooling water of the diesel engine is to（） Ⅰ. resist the scale formation in the cooling chamber Ⅱ.lubricate the engine part Ⅲ.increase thermal capacity Ⅳ.resist corrosion

  A . Ⅰ+Ⅱ B . Ⅱ+Ⅲ C . Ⅲ+Ⅳ D . Ⅰ+Ⅳ

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• An interlock in the remote operating valve line stops the valve （） when the engine turning gear is engaged.

  A . to open B . opening C . open D . opened

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• The organizational structure may be changed with the growth and expansion of business operations.

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• What is the reason for the possible expansion of the PC market?

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• Expansion work is the work of expansion （）.

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• What happened during the agricultural expansion in the southern Great Plains？

  A．People improved the soil by planting wheat. B．Raising cattle and other livestock became less common. C．Most of the landowners became farmers. D．Much of the grassland was destroyed. 此题为多项选择题。

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• When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will .

  A.always be wide open when the compressor restarts B.continue to operate as if the system were in operation C.remain open until evaporator pressure equalizes, then close until the compressor restarts D.always be completely closed until the compressor restarts

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• 21)the global expansion

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