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Electric HeatingThe process in which electrical energy is converted into heat by resisting the free flow of electric current is known as electric heating. Therefore, the heat is produced due to circulation of electric current through a resistance. This electric current may be circulating directly due to the application of potential difference or it may be due to induced eddy currents.Different Methods of Electric HeatingThe classification of methods used for electric heating is shown in the figure.Direct Resistance HeatingIn this method of electric heating, the electric current is passed through the substance to be heated. This method of electric heating ... Read More
Electric Arc WeldingThe electric arc welding is the welding process which uses electric arc to create heat to melt and join the metals. In the electric arc welding, the electric power supply creates an electric arc between the electrode and the base material.Depending upon the type of power supply used, the electric arc welding equipment is classified into two sections as −Direct Current (DC) Arc WeldingAlternating Current (AC) Arc WeldingEquipment Required for Electric Arc WeldingThe various equipment required for the electric arc welding (AC and DC) are shown in the figure and described below.Welding MachineThe welding machine used for electric ... Read More
Heat TransferThe heat transfer is defined as the transmission of heat energy from one region to another region as a result of temperature gradient. In actual practice, the heat transfer always takes place from the region of high temperature to the region of low temperature.Modes of Heat TransferThe transfer of heat energy from one region to another region takes place by the following three modes −ConductionConvectionRadiationIn a majority of real situations, heat transfer occurs as a result of a combination of these modes of heat transfer.ConductionWhen the heat transfers from one part of the substance to another part without the ... Read More
Resistance WeldingResistance welding is the welding process of joining of metals by applying mechanical pressure and passing a heavy current for a length of time through the metal parts which are to be joined. The chief advantage of the resistance welding is that it does not require any other material for creating the bond which makes it cost effective.Arc WeldingArc welding is the process in which the metals are joined by using electricity to create enough heat to melt metals, and the melted metals, when cool, result in the joining of the metals. The arc welding uses a welding power ... Read More
There are two types of electric currents used for welding process viz. AC and DC. There are many differences between the AC welding machine and the DC welding machine.AC Welding Machine Vs DC Welding MachineThe following table compares and contrasts the different features of AC and DC welding machines −AspectAC Welding MachineDC Welding MachineCostAC welding machine is less expansive.DC welding machine is 2 to 3 times costlier than AC welding machine.Size & WeightAC welding machine is smaller in size and light in weight.DC welding machine is larger in size and heavier in weight.OperationThe AC welding machine is simple to operate.The ... Read More
The atomic hydrogen arc welding is an arc welding process which uses an arc between two tungsten electrodes in a shielding atmosphere of hydrogen. The atomic hydrogen arc welding was invented by Irving Langmuir.The essentials of the atomic hydrogen arc welding are as follows −The electrical energy is supplied to create an arc between two tungsten electrodes where it is transformed into heat.The source of electrical energy could be either DC or AC, but in practice, AC supply should be chosen as it is commonly available.Molecular hydrogen is blown through the arc and transformed catalytically into the atomic form which ... Read More
Suppose, we are making a cleaning robot that works on a grid. The grid is of dimensions h x w. There are m dirty cells that need to be cleaned that are given in an array of integer pairs 'dirt'. The cleaning robot, if placed in a particular cell; can clean every cell in that particular row and column. So, our task is to clean the maximum number of dirty cells. We have to find out the count and display it as output.So, if the input is like h = 3, w = 3, m = 3, dirt = {{0, ... Read More
In this article, we will understand how to print pyramid star pattern. The pattern is formed by using multiple for-loops and print statements.Below is a demonstration of the same −InputSuppose our input is −Enter the number of rows : 8OutputThe desired output would be −The pyramid star pattern : * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *AlgorithmStep 1 - ... Read More
To return True if all entries of two arrays are equal, use the ma.allequal() method in Python Numpy. Returns True if the two arrays are equal within the given tolerance, False otherwise. If either array contains NaN, then False is returned.The fill_value sets whether masked values in a or b are considered equal (True) or not (False). A masked array is the combination of a standard numpy.ndarray and a mask. A mask is either nomask, indicating that no value of the associated array is invalid, or an array of booleans that determines for each element of the associated array whether ... Read More
In this article, we will understand how to call one constructor from another. The keyword 'this()' is used to invoke a constructor.Below is a demonstration of the same. We will displaying sum and product of two numbers while using this() −InputSuppose our input is −The numbers are defined as 12 and 30OutputThe desired output would be −The sum is: 42 The product is: 360AlgorithmStep 1 - START Step 2 - Declare an integer value namely my_sum Step 3 - In the main class, we define a ‘this’ reference to the numbers which would be used as input. Step 4 - This ... Read More