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Lightening conductors are used to protect building from lightning strikes. Which of the following statements is/are true about lightening conductors? 1) Lightening conductors create an electric field at its top that lightning strikes it preferentially 2) Lightning conductors reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building 3) Lightning conductors take all the charge (current) to deep down in the earth 4) Lightning conductors must be installed at a place taller than the building Select the correct answer using the code given below
Consider the following losses for short circuit test on a transformer: 1. Copper loss 2. Copper and iron losses 3. Eddy current and hysteresis losses 4. Friction and windage losses Which of the above is/are correct?
The pie chart given below shows the amount spent by a boy on the purchase of six different items. The total amount spent on all these six items is Rs. 54000. The amount spent on a specific item is represented as a degree with reference to the total amount spent on all these six items. Which of the following statement(s) is/are correct? I. The amount spent on article A is Rs.900 less than the amount spent on article B. II. The amount spent on article C is Rs 2400 more than the amount spent on article D. III. The ratio of the amount spent on article B to the amount spent on article E is 4 : 1.
Consider the following statements about Sun Corona - 1. The Sun’s corona is the outermost part of the Sun’s atmosphere. 2. Corona can be viewed during a total solar eclipse Which of the above statements is/are correct?
In the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then divided which of the given conclusion logically follows the given statements. Statements: I. All virus are corona. II. Some virus are dangerous. Conclusions: I. Some dangerous are corona. II. Some virus are corona.
What is the function of steel wire in ACSR conductors?
An alloy A contains two elements, copper and tin in the ratio of 2 : 3, whereas an alloy B contains the same elements in the ratio of 3 : 4. If 20 kg of alloy A, 28 kg of alloy B and some more pure copper are mixed to form a third alloy C which now contains copper and tin in the ratio of 6 : 7, then what is the quantity of the pure copper mixed in the alloy C?
Two alloys used to manufacture the third alloy. The first alloy contains Copper and Zinc only, and the second alloy contains Aluminium and Copper only. The Copper content in the two alloys is 40% and 60% respectively. The Zinc content in the new alloy should be between 30 to 40%. How much will be the minimum and maximum Copper content in the new alloy?
An alloy of copper and tin weights 400 grams. It contains 75% of copper. How much percentage of copper with respect to the initial mixture should be added to the alloy so that percentage of copper increased to 80%?
Alloys A and B contain copper and zinc. In alloy A percentage of copper is 25% and in alloy B ratio of copper and zinc is 3 ∶ 5. In what ratio of A and B to be mixed to get a new alloy containing copper and zinc in the ratio 1 ∶ 2?