Mechanical Equipment [Daily Question] 2011.12.26 Monday

Thread Content

This post was last edited by zhiyuan1100 on 2011-12-27 at 12:42. Please hide your replies; editing after posting is ineffective! Those with different opinions on the provided answer keys can post discussions the next day. For responses from multiple accounts under the same IP, only the first one is considered valid. This is a multiple-choice question: 5 points are awarded for answering all questions correctly, 3 points for answering each question correctly, and 2 points for the rest. There is a reward for everyone who participates. Please hide your replies; the method for hiding them is: http://bbs.hcbbs.com/thread-492556-1-1.html Single-choice questions: 1. In the absence of specific recommendations from the equipment manufacturer, which of the following statements is correct regarding the selection of lubricant grades? A. For equipment with high speeds and low loads, high-viscosity lubricant should be used. B. For equipment with high speeds and high loads, high-viscosity lubricant should be used. C. For equipment with low speeds and low loads, low-viscosity lubricant should be used. D. For equipment with low speeds and high loads, high-viscosity lubricant should be used. 2. After a lubrication system was cleaned and its oil was replaced, it was tested in operation; after the oil pump started, the system exhibited abnormal vibration and noise. After observing for about 30 minutes, the vibration and noise gradually decreased. Which of the following explanations best fits this situation? ( ). A. The pump inlet filter has not been cleaned. B. The pump outlet filter has not been cleaned. C. There is a small amount of air in the pipes, which is expelled after the pump operates for some time. D. The oil level in the tank is insufficient. Answer: D C