【Daily Question: Pump Equipment】Fill-in-the-blank question, 3.1.2019
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bk14.jpg Rules for fill-in-the-blank questions: 1. If both blanks are answered incorrectly, +2 wealth is awarded for active participation; if one blank is answered incorrectly and the other correctly, +5 wealth is given; if both blanks are answered correctly, +8 wealth is awarded. 2. If only one answer is provided, unless it is clear which question’s answer it is, a correct answer earns +5 wealth points, while an incorrect answer earns +2 wealth points; in all other cases, it is counted as active participation and grants +2 wealth points. 3. Rewards for answers are available once per person only. 4. Each reply allows scoring for only one person. 5. The answer and its explanation will be visible after responding. 6. The reward for responding is valid within 48 hours; no reward will be given if the deadline is missed. Studying* and winning awards again; come by here every day. 1. Under normal circumstances, when the frequency of an inverter-driven motor is reduced to 40 hertz, ignoring any changes in the load, the output torque ( ) ； 2. The spark-free coupling shield achieves the requirement of no sparks through the form of ( ). Answer: 1. Remain basically unchanged; 2. Use materials that are less likely to generate sparks when in frictional contact at locations within the coupling where such contact is likely to occur, such as aluminum plates
1. Remain basically unchanged; 2. Use materials that are less likely to generate sparks when in frictional contact at locations within the coupling where such contact is likely to occur, such as aluminum plates and copper
I’ve never seen copper-lined ones; it’s probably because of the high cost
1. Increase. 2. Achieved using non-sparking materials, such as aluminum or copper
Basically unchanged/Flame-retardant materials such as aluminum are used in areas where frictional collisions may occur
Materials that remain essentially unchanged, and that do not generate sparks when subjected to frictional impacts in locations where contact is likely inside the coupling, such as aluminum sheets
Decrease; collisions do not produce sparks.
1. Remain basically unchanged; 2. Use materials that are less likely to generate sparks when in frictional contact at locations within the coupling where such contact is likely to occur, such as aluminum plates