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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
Two similar bars of Steel and Aluminium are heated to a same temperature. Forces are applied at the ends of the bars to maintain their lengths unaltered. If the ratio of Young’s moduli of Steel and Aluminium is 3, and the ratio of the coefficients of thermal expansion of Steel to that of Aluminium is 0.5, what is the stress on the Aluminium bar if the stress on the Steel bar is 100 MPa?
Each question comprises of a statement and two conclusions I) and II). Assuming that the statement is true, which of the conclusions follow logically from the statement? Statement: Because of growth in production of Aluminium by National Aluminium Company, India has become self-sufficient in Aluminium. Conclusion: I) Previously India had to import Aluminium. II) At this rate, India may start exporting Aluminium.
Which one of the following is NOT correctly matched? Aluminium Plants Location (a) Madras Aluminium Company Limited (MALCO) Chennai (b) Bharat Aluminium Company Limited (BALCO) Korba (c) Hindustan Aluminium Corporation Limited (HINDALCO) Renukoot (d) Indian Aluminium Company Limited (INDAL) Hirakud
An aluminium bar of 8 m length and a steel bar of 5 mm longer in length are kept at 30°C. If the ambient temperature is raised gradually, at what temperature the aluminium bar will elongate 5 mm longer than the steel bar (the linear expansion coefficients for steel and aluminium are 12 × 10-6/°C and 23 × 10-6/°C respectively)?
There are two alloys of copper and aluminium, alloy A has 40% aluminium and alloy B has 10% copper. In what ratio should these alloys be mixed so that the cost of total copper becomes equal to the cost of total aluminium in the mixture? (The cost price of aluminium is Rs. 200 per kg and cost price of copper is Rs. 500 per kg)
Consider the given statement/s to be true and decide which of the given conclusions/assumptions can definitely be drawn from the given statement. Statement: I: All windows are aluminium. II: Some windows are wooden. Conclusion: I: Some wooden are not aluminium. II: Some wooden are aluminium. III: Some aluminium are window.
In AC.S.R. Conductors, the insulation between aluminium and steel conductors is
Assertion: Good conductors of heat are also good conductors of electricity and vice-versa. Reasons: Mainly electrons are responsible for these conductors.
What is the total ampere conductors/pole (in SI) if 600 lap wound conductors carry 120A current through conductors (P=4)?