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Which of the following statement(s) is/are true regarding butt welding? 1. Flash butt welding is a combination of resistance, arc and pressure welding 2. Upset butt welding is used for welding rods 3. Percussion Welding is a self timing spot welding method 4. Aluminium alloys are flash welded
For gas welding, the pressure desired at the welding torch for acetylene is
Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.
Consider the following statements: In metal arc welding 1. Utilizes a consumable electrode 2. A welding torch used is connected to acetylene gas supply 3. The electrode and work-piece are connected to the welding power supply. Which of these statements are correct?
The highest pressure gas of a mixture has partial pressure p, the partial pressure of other gases decreases by factor of 2n-1, the partial pressure of second gases decreases by a factor of 2, partial pressure of third gas increases by 4, and so on, if the total pressure of gas mixture is 31p/16, how many gases are present in the mixture?
In forehand welding, the angle between the welding torch and the work is ________ as compared to backhand welding.
If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?
The pressure of acetylene in welding torch for oxy-acetylene welding is maintained at _________
A mixture of oxygen and ethyne is burnt for welding. Which of the following statements is correct about NOT using a mixture of ethyne and air? 1. Ethyne may not burn completely with air as with pure oxygen. 2. Without mixing oxygen, it is difficult to reach the high temperatures needed for welding. Select the correct answer using the code given below.
4 g of hydrogen gas reacts with ‘x’ grams of oxygen gas to form 36 g of water. How many atoms of oxygen will be present in ‘x’ grams of oxygen gas?