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Consider the following statements for an induction furnace: 1. High-frequency current is generally used for the furnace working. 2. There is less loss of alloying elements due to oxidation. 3. Pronounced stirring action of molten metal occurs inside the furnace. 4. Slag cover is essential for the efficient working of the furnace. Which of the above statements are correct?
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.
Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
Which of the following is not a directly fired furnace?
Which of the following facts is/are correct about the blast furnace in Iron metallurgy? Limestone is added to the blast furnace to reduce the iron oxide in the ore to iron. Coke is added to the blast furnace to physically separate iron from other impurities. Carbon dioxide reduces to carbon monoxide.
A cylindrical stainless steel (k = 25 W/m K) ingot, 10 cm in diameter and 25 cm long, passes through a heat treatment furnace which is 5 meter in length. The initial ingot temperature is 90 degree Celsius, the furnace gas is at 1260 degree Celsius and the combined radiant and convective surface coefficient is 100 W/m2 K. Determine the maximum speed with which the ingot moves through the furnace if it must attain 830 degree Celsius temperature. Take thermal diffusivity as 0.45 * 10 -5 m2/s
Two long rods A and B of the same diameter have thermal conductivities k and 4k and have one of their end inserted into a furnace at 400 K. At 9.5 m away section from the furnace, the temperature of rod B is120 degree Celsius. So find out at what end from the furnace end, the same temperature would be reached in the rod A?
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
Which of the following statements about the first act of the Revolt of 1857 is/are true? It occurred in Meerut when two sepoys stole a superior officer's rifle. It began when the Rani of Jhansi declared war on the British. It began when Mangal Pandey fired at a European officer in Meerut. It began when Mangal Pandey fired at a European officer in Barrackpore. Select the correct answer using the code given below:
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value