Basic Knowledge of Ammonia Synthesis – One Question per Day 66

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Single-choice question 1: The temperature of the hot water inside the hot water pump has not yet decreased; reducing the pressure in the conversion system at this time will cause the hot water pump to (). A、Cavitation, B、Binding, C、Overload, D、Overcurrent. 2. During the shutdown procedure of the heat pump, which option is incorrect? ( ) A. When the pump is shut down for maintenance, all fluids flowing into the pump must be stopped. B. After the pump is disconnected, the fluids remaining inside it should be removed through the pump’s drainage system. C. Before carrying out maintenance on the pump, it is necessary to ensure that the pressure inside the pump is at atmospheric level. D. When the pump is shut down for maintenance, only the inlet valve and outlet valve of the pump need to be closed. 3. During the maintenance of the equipment, what are the requirements regarding methanol emissions? A. Discharge into a sealed container, B. Discharge into a sewer and dilute with water, C. Discharge onto the ground and dilute with water, D. No special requirements. 4. The disadvantage of pearlescent sand as an insulating material is (). A、High density, B、High heat-insulation performance, C、Low cost, D、Good fluidity. 5. During the cyclic freezing phase, the liquid nitrogen washing device primarily uses the ( ) principle for cooling. A. Joule-Thomson effect, B. Ice-based refrigeration, C. Isentropic expansion, D. Direct supply of liquid nitrogen from an air separation unit. Correct answers: 1. (A), 2. (D), 3. (A), 4. (A), 5. (A).