03] Compare between regeneration and intercooling methods used to inmprove the efficiency of hydro power station.
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- 1) what is the potential transformer used for in power substation? 2) what is process leads to lowering the number of free electrons? 3) what is The Townsend's Criterion 4) why Sulphur Hexafluorid has good insulation strength? 5) What is Intrinsic Breakdownb-Two aluminum and copper wire resistors consume 0.5 W when connected in parallel to 2 V DC supply. The aluminum wire is 40% length more than copper wire. Calculate the power consumed by the two resistors when connected in series to the same DC supply. Assume equal cross-section area and the resistivity of aluminum is to be 20% more than that of copper.Notes on the verification of ohm's law by voltage method?
- a) A coil consist of 2000 turns of copper wire having a cross sectional area of 0.8mm?. The mean length per turn is 80 cm and the resistivity of copper is 0.02µN-m. Find the resistance of the coil and power absorbed by the coil when connected across 110V D.C supply.3.12 A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conduct a current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush. 3.13 Early DC machines use brass brushes instead of carbon brushes. The com- mutator bars do not last very long since brass is a rather hard metal. If a brass brush of the dimensions determined in problem 3.12 is used instead to conduct the same current, determine the voltage drop.Eлample (1) For the series-parallel arrangement shown in Figure below, find: a) The supply current. I ?. b) The current flowing through each resistor. c) The p.d. across each resistor. R3 2.50 40 Ri R4 RE I ? 200V
- 30. A wooden board of 30cm X15cm X 2cm is to be heated from 30°C to 180°C in 10 minutes by dielectric heating using 40MHZ supply. Specific heat of wood is 0.35 and density 0.55gm/ccm, relative permeability = 5 and power factor = 0.05. Estimate the voltage across specimen and current during heating. Assume efficiency as 90%.A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conduct a current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush.Q3- When does the Zener-current IZ begin to flow ?
- 4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?ESSAY. Explain in your own words and discuss the significance One of the most important parameters for semiconductor components is the power rating. Explain why power rating is such a critical parameter, especially compared with other types of electronic components (resistors, inductors, capacitors, etc.).ciocle with 24mA OF Current Flowing through has a vortage chop of 0.75V. Determine the reverse Saturation Current Is In A. Assume M = 1. Present Using ^ Cxy to answer in scientific notation your For the exponent. A H