One Question per Day (September 16, 2011)
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This post was last edited by why1982 on 2011-9-16 at 16:52. I was on a business trip some time ago, and then the company has been extremely busy; as a result, I’ve had little chance to access the Internet lately. Before the business trip, I had planned to create a daily question in the hope of getting everyone’s participation. Since I finally finished work today, let’s start the first installment of the daily question series. Please hide your replies; editing after posting is ineffective! Those with different views 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. + N6 {) n7 U1 b0 j7 I. K0 T, o. h This is a single-choice question; 5 points are awarded for a correct answer and 3 points for an incorrect one. There is a reward for everyone who participates. Please hide your reply. The method for hiding it is: http://bbs.hcbbs.com/thread-492556-1-1.html4 }' Regarding the maximum allowable temperatures for electrical insulating materials of grades B, F, and H, which of the following options is correct? A 120°C ； 150°C ； 170°C ； B 120°C ； 150°C ； 180°C ； C 130°C ； 155°C ； 170°C ； D 130°C ； 155°C ； 180°C ； Answer D
For this question, I choose d. Class B: The maximum allowable temperature is 130°C, such as polyester films, mica products, glass fibers, asbestos, etc. : C& R9 E/ ~; |+ Grade: The maximum allowable temperature is 155°C, for products made of mica, asbestos, or glass fiber that are bonded or impregnated with heat-resistant organic resins or paints. 7 T’ _9 k% G7 b( k ^3 Y Grade H: The maximum allowable temperature is 180°C, such as reinforced Grade F materials, mica products, silicone, and mica composite products.
This post was last edited by Tianye 88 on 2011-9-16 18:05, choosing (d) B 130 F 155 H 180
D, 130℃； 155℃ ； 180℃ ； The big, chubby moderator’s ° symbol is really annoying to look at: lol
Reply 1# why1982 D
D 130°C； 155°C ； 180°C ；
B 120°C； 150°C ； 180°
D 130°C； 155°C ； 180°C ；