When replacing a thermostatic expansion valve sensing bulb, it is necessary to

A．apply a light film of oil to increase heat transfer

B．apply a light film of oil to prevent oxidation

C．apply a heavy coating of grease to function as a heat sink

D．carefully coat the device with silicone sealant to reduce the effects of convective cooling

[单选题]A． thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA．evaporator pressure decreaseB．evaporator coil over-feedC．evaporator capacity increaseD．expansion valve diap

[单选题]If the superheat value of a thermostatic expansion valve is set too low, the _.A．the suction line will be abnormally cold and liquid may slug back to the compressorB．the suction line will be hot due to a reduced amount of refrigerant returning to the

[单选题]The author thinks that replacing gas with corn ethanol is.A． impracticalB. acceptable C. admirable D. useless

[单选题]Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.A . deflectionB . discrepancyC . errorD . tolerance

[单选题]A company is planning a $50 million expansion. The expansion is to be finan

[单选题]A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.A . around the engineB . around the coolerC . to the expansion tankD . overboard

[单选题]The expansion valve used in a refrigeration system regulates theA．superheat of the gas leaving the compressorB．back pressure in the evaporatorC．temperature in the refrigerated spaceD．degree of superheat of the gas leaving the evaporator

[单选题]_____ allows for expansion and water make up in the water cooling system.A．A top tankB．A head tankC．A head valveD．A drain tank

[单选题]A．llowances may be made for the expansion and contraction in piping by the use of expansion joints or ().A．UnionsB．Retractable flangesC．Union bulkhead fittingsD．Bends or loops in the line

[名词解释] 扩张路径（Expansion path）