Questions about the answers to issue 105
Thread Content
This post was last edited by jsnjhu on 2009-12-30 at 13:12. Quiz No. 105: 6. A multimeter can be used to measure resistance while the circuit is still powered. 7. When calibrating a pressure gauge, you can gently tap the gauge case with your hand. The answer given by Banzhu is TT. Personally, I think the answer should be FF, because using a multimeter to measure the resistance of a circuit while it’s under voltage can damage the multimeter and even lead to accidents. When calibrating a pressure gauge, tapping the gauge body with your hand can result in inaccurate readings.
This post was last edited by a985658 on 2009-12-30 at 13:25. I agree with the original poster’s view; this should be common sense, and the answer is likely incorrect. You are a careful person who dares to question things. On the other hand, the prerequisite for daring to engage in critical reflection is a substantial accumulation of knowledge.
7. When calibrating a pressure gauge, you can gently tap the gauge case with your hand. This is correct; it’s not only possible to tap it gently with the hand, but I feel it’s necessary to do so. The pressure gauge needs to be adjusted accurately, and it’s also important to ensure that it doesn’t get damaged due to being too sensitive during use. It’s also an effective way to check whether there are any loose screws in the internal mechanical parts!
This post was last edited by jsnjhu on 2009-12-30 at 13:57. Calibration procedures for diaphragm pressure gauges: Tap displacement: For each calibration point, when increasing (or decreasing) the pressure, or decreasing (or increasing) it again, the change in the reading caused by tapping the gauge case shall not exceed 1/2 of its allowable error. Light tapping is acceptable once the calibration process has stabilized; however, it is not permitted during the process of increasing (or decreasing) the pressure in the gauge. The exam questions do not specify that the pressure is under steady-state conditions. Following the logic of the third floor, there should be no vibration in areas where pressure is applied; obviously, this is not the case.
The first is correct, the second is wrong.
All the answers given by the question setter are correct. TT!