Refining Knowledge (Technology) – One Question per Day 110217 (Happy Lantern Festival)
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We welcome everyone to actively participate in the learning and discussion of professional basic knowledge in the refining technology exchange area! In accordance with the forum’s uniform requirements, the maximum score for this activity is 5 Wealth points, and rating charm is prohibited. At the same time, friendship requests and repeated ratings are declined. Be cautious when posting; editing is ineffective. Those who have different opinions on the provided answer keys can post discussions the next day; those who provide solutions or their own opinions regarding the answer key for the daily question will receive appropriate rewards! The key is participation; there are prizes for participating. 1. The steps to start the reciprocating pump are ＿＿＿＿. A. First open the inlet valve and outlet valve (or bypass valve), then supply power.B. First open the inlet valve, close the outlet valve (or bypass valve), then supply power.
C. Close the inlet valve, open the outlet valve (or bypass valve), then supply power.
2. The vapor load between 1 and 2 tray sections at the top of an atmospheric distillation column is ( ).
A. Maximum
B. Minimum
3. Compared to vortex pumps, centrifugal pumps have __:
A. Low head, high flow rate, poor self-priming ability
B. High head, low flow rate, strong self-priming ability
C. Low head, low flow rate, strong self-priming ability
D. High head, low flow rate, poor self-priming ability
4. For centrifugal pumps with significant variations in flow rate, in order to save energy, the following method can be used to alter the pump’s characteristics:
A. Use a variable-speed motor
B. Trim the impeller
C. Reduce the number of impeller stages
D. Block part of the impeller’s inlet
5. The total power of pumps connected in series is equal to __. A. The sum of the powers of all pumps B. The difference between the powers of the pumps C. The power of one of the pumps A ； A ； A ； A ； A
1. The steps to start the reciprocating pump are ＿a＿＿＿. A. First open the inlet valve and the outlet valve (or bypass valve), then supply power. B. First open the inlet valve, close the outlet valve (or bypass valve), then supply power. C. Close the inlet valve, open the outlet valve (or bypass valve), then supply power. 2. The vapor load between 1.2 trays at the top of a atmospheric pressure tower is (b). A. Maximum 8 M; S(g9x) E B. Minimum 3. Compared to vortex pumps, centrifugal pumps have a____: A. Lower head, higher flow rate, poor self-priming ability B. Higher head, lower flow rate, strong self-priming ability C. Lower head, lower flow rate, strong self-priming ability D. Higher head, lower flow rate, poor self-priming ability 4. For centrifugal pumps with large fluctuations in flow rate, to save energy, the ____ method can be used to modify the pump’s characteristics: A. Using a variable-speed motor B. Modifying the impeller C. Reducing the number of impeller stages D. Blocking part of the impeller’s inlet 5. The total power of pumps connected in series equals __c. A. The sum of the powers of all pumps B. The difference between the powers of the pumps C. The power of one of the pumps
I laughed when I saw the answer: five A’s, that’s amazing!
Answer: 1、A 2、A 3、A 4、A 5、A
This post was last edited by dongliangsir on 2011-2-17 22:18. A A A A C