Let’s take a look at some questions on chemical engineering machinery

1.B 2.A 3.B (I’m not sure about this; first, water and foam extinguishers can be ruled out. As for sand and carbon tetrachloride, I’m not certain, but carbon tetrachloride is more effective.) 4.A 5.B (When the interference amount is small, A/C/D can be used; if it’s large, a press is necessary to force it in.) 6.A. No further explanation needed for the others.

1.B 2.C 3.B 4.B 5.C 6.A True/False Question: False

1 C 2 C 3 B 4 B 5 C 6 C Determine X

1、 C 2、C 3、B 4、B 5、C 6、A Judgment: Wrong

My own answers: 1.BC 2A 3BD 4B 5C 6AC X What do you all think?

1. I checked that; either of the two is fine. Deep groove ball bearings can only withstand a small amount of axial force, but they are still capable of withstanding it. Needless to say, self-aligning bearings can definitely handle it. I also checked, and it is indeed sticking. I also thought it was abrasive wear at first, but that was indeed wrong. 3. I have no experience with this, but sand can be used; however, the appliance will stop working after the sand is used up. It’s estimated that even if the fire is extinguished using carbon tetrachloride, the equipment will no longer be usable. 4. Fatigue pitting is the main cause of failure in rolling bearings. The other options represent forms of gear failure; 5. For a large interference amount, heating is used. . I was skeptical about this, but the experienced master told me so. 6. I’m not quite sure about this – what does a general-purpose centrifugal pump mean? It’s common to find pumps that use packing or mechanical seals. There’s no need to explain multiple-choice questions; I can only say that everyone is right, and I’m right too: lol The answer given was wrong. . . . .

Everyone, take a look – am I right? I’m looking for an authoritative answer :lol

Multiple-choice questions: 1. When bearing radial forces as well as a certain amount of axial force, which type of bearing should be chosen? (B) A. Thrust ball bearing B. Self-aligning ball bearing C. Deep groove ball bearing D. Cylindrical roller bearing 2. Which type of wear is caused by dry friction, leading to the loss of material from the surfaces of moving parts? (B) A. Adhesion wear B. Surface fatigue wear C. Abrasive wear D. Chemical wear 3. When an electrical device catches fire, what should be used to extinguish it? (D) A. Water B. Carbon tetrachloride C. Foam extinguisher D. Sand 4. The main mode of failure for rolling bearings is (D). A. Adhesion B. Fatigue pitting C. Permanent deformation D. Wear 5. When the interference fit is very large, which method can be used to assemble the bearing? (C) A. Inserting it using a sleeve B. Pressing it in with mechanical force C. Using temperature differences D. Inserting it using a copper rod 6. The shaft seal used in general-purpose centrifugal pumps is (A). A. Packing seal B. Labyrinth seal C. Mechanical seal D. Static seal

True or False questions: The piston ring sealing in piston compressors is a combination of plug sealing and throttling sealing. Yes

A A D B C A

These questions are good; I’d like to see more of them, with a broader range of topics. Are there any more?