Hydroelectric Power Plants

Q. On what factors does the power output of a hydropower plant depend? Ans. The power developed by a hydro plant depends upon the discharge and head and is directly proportional to their (discharge and head) product. Q. What is meant by catchment area? Ans. The catchment area is the…


Steam Power Plants

Q. Why the thermal efficiency of a steam power plant is quite low? Ans. In a steam power station, more than 50% of the total heat of combustion is lost as heat rejected to the condenser and this loss is unavoidable as heat energy cannot be converted into mechanical energy…


Nuclear Power Plants

Q. Name three important factors in choosing a site for an atomic power plant.   Ans. Three important factors in choosing a site for atomic power plants are: (i) availability of water supply (ii) distance from a populated area (iii) transportation facilities. Q. Name three different types of fuels used…


Tariff for Electrical Energy

Q. What type of tariff is employed for domestic consumers? Ans. Block rate tariff Q. What is two-part tariff? Ans. In the two-part tariff, the total charge to be made to the consumer is divided into two components namely fixed charge (proportional to connected load or maximum demand) and the…


Gas Turbine Power Plants

Q. How does a gas turbine differ from a diesel engine?   Ans. The gas turbine is different from the diesel engine in the respect that the combustion region is external to the prime mover. Q. Why are the majority of gas turbine power plants employed as peak load plants?…


Power Factor Improvement

Q. What is the necessity of power factor improvement? Ans. Low power factor causes the ratings of generators and transformers, the cross-sectional area of the bus-bars and the contact surface of the switchgear, the size of the feeders and distributors, energy losses, voltage drops in generators, transformers, transmission lines and…


Diesel Electric Power Plants

Q. What is the basic difference between a diesel engine and a steam turbine? Ans. The main difference between a diesel engine and a steam turbine is that in the diesel engine the chemical energy of combustion is released inside the cylinder whereas in case of steam turbine the energy…


Earthing or Grounding

Earthing or Grounding Grounding is the process of creating an alternative(different) path for the flow of fault(excessive) currents safely into the ground in the presence of minimal resistance or impedance. It connects non-current carrying parts of an equipment to the general mass of earth in such a manner as to ensure,…


Insulating Materials for Cables & Electronic Equipments

Insulating Materials for Cables The insulating materials (dielectrics) used for cables must have low discharge current, low dissipation factor (low loss tangent), and should be chemically stable. The materials generally used are impregnated paper, bituminous compounds, rubber, compressed air, mineral oil etc. In the present days, cross-linked polyethylene cables (XLPE)…


Components of A Substation

The main components of a substation are Busbars Surge or Lightning Arresters Isolators or disconnecting switches Earth Switch Circuit Breaker Power Transformer Wave Trap Current Transformer Potential Transformer 1. Busbars It is a strip or bar of copper, brass or aluminium that conducts electricity within a switchboard of a substation.…


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