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Explain Thermosetting Plastic Materials.
Thermosetting Plastic Materials: They undergo huge changes while subjected to high temperatures for rather sometimes. They are called as baked and no longer can melt or be dissolved. They are more brittle, less elastic and lose their elasticity while subjected to prolonged heating. Therefore they cannot be remoulded in various shapes once they are hardened and set. They are used, while insulation is to withstand high temperatures without losing or melting its shape and also mechanical strength. Thermosetting plastic substances are space-polymers and the molecules branch off in different directions throughout polymerisation. Such structure makes them extremely rigid, fusible, poorly soluble, and enable of forming elastic films and threads. Examples are Phenol formaldehyde (i.e. Bakelite), Epoxy resins.
Q. A 25-kVA, 2200:220-V, 60-Hz, single-phase transformer has an equivalent series impedance of 3.5 + j4.0 referred to the primary high- voltage side. (a) Determine the highest
A three-phase transposed line is composed of one conductor per phase with flat horizontal spacing of 11 m as shown in Figure 1(a). The conductors have a diameter of 3.625 cm and a
Q. Consider the bridge circuit given in Figure with R 1 = 24 k, R 2 = 48 k, and R 3 = 10 k. Find R when the bridge is balanced with V = 0.
what is crossmagnetisation in dc generator
Applications of high resistivity materials
Q. Explain about Capital stock? Capital stock illustrates the amount of the owners' investment in the corporation.
For the circuit in figure, find the current through each resistor.
Test Schedule - Meter Testing The test schedule as per the Central Electricity Authority Regulations on Installation and Operation of Meters is given below. Table: Test S
Find the rms voltage of the given cardiac wave
It is needed to use a half-wave rectifier for a dc power supply that gives an average dc output voltage of 15 V and a maximum ±1V ripple is permitted. The rectifier feeds a load of
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