21. The expansion valve is the regulator through which the refrigerant flows from _______________________ of the system . (A) the high pressure side to the low pressure side (B) the low pressure side to the high pressure side (C) the liquid status to the vapor status (D) the low temperature side to the high temperature side

21. The expansion valve is the regulator through which the refrigerant flows from _______________________ of the system .
(A) the high pressure side to the low pressure side
(B) the low pressure side to the high pressure side
(C) the liquid status to the vapor status
(D) the low temperature side to the high temperature side

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統計： A(244), B(72), C(65), D(39), E(0) #1512183

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Willie

2021/10/11

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39. Check valves must be provided on pump suctions to prevent pumping through the standby pump to the sump. Pump isolating valves should be provided to permit underway repair of either pump. Based on these descriptions, which is the correct statement？ (A) The isolating valves must be non-return valves. (B) The check valve also needs to be positioned at the pump exit in order to improve the pumping efficiency. (C) The check valve allocated on pump suctions permits no flow from the idle pump into the sump. (D) The check valve allocated on pump suctions permits the isolation of the running and standby pumps so that the isolating valves could be ignored for the emergency operation.

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