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Question

In mountainous regions, streams can be found almost everywhere. Energy of such streams to move small turbines generates electricity. They are called ______.

The correct answer is

Mini hydel plants

Understanding Mini Hydel Plants from Mountain Streams

The question asks for the correct term used to describe small electricity generation units that utilize the energy of streams in mountainous regions to move small turbines. This process involves converting the kinetic energy of flowing water into electrical energy.

Let's examine the process and the options provided:

  • In mountainous areas, there are many streams with flowing water.
  • This flowing water possesses energy.
  • Small turbines are placed in the path of the flowing water.
  • The energy of the water causes the turbines to rotate.
  • These rotating turbines are connected to generators.
  • The generators convert the mechanical energy of the turbine into electrical energy.

This method of generating electricity using water is known as hydroelectric power generation. When done on a small scale, especially using streams, it is referred to as 'mini' or 'micro' hydroelectric power.

Now let's look at the given options:

  1. Mini Mountain Electricity: This is a very general term. It describes electricity generated in mountains on a small scale, but doesn't specify the source of energy (like water, wind, solar).
  2. Mini hydel plants: The word "hydel" is derived from "hydro," which means water. So, "hydel plants" are power plants that use water to generate electricity (hydroelectric plants). "Mini hydel plants" specifically refers to small-scale hydroelectric power plants. This aligns perfectly with the description in the question: using stream energy (water) in mountainous regions (where streams are common) with small turbines to generate electricity.
  3. Mini Electricity plants: Similar to option 1, this is a general term for small electricity generation facilities. It doesn't specify the energy source.
  4. Mini dynamo plants: A dynamo is a type of electrical generator, specifically one that produces direct current (DC). While a generator (which could be a type of dynamo) is a component of a hydroelectric plant, "dynamo plants" is not the standard term for a power generation facility, especially one based on water energy.

Based on the analysis, the term that accurately describes small electricity generation units using the energy of streams in mountainous regions is "Mini hydel plants".

Revision Table: Key Terms

Term Definition Relevance to Question
Hydroelectric Power Electricity generated from the energy of moving water. The process described in the question is a type of hydroelectric power generation.
Hydel Plant A power plant that generates electricity using water power. Synonym for hydroelectric plant.
Mini Hydel Plant A small-scale hydroelectric power plant, often using energy from streams or small rivers. Matches the description of using streams and small turbines for electricity in mountainous regions.
Turbine A machine that converts the kinetic energy of a fluid (like water or air) or gas into mechanical energy. A key component in a hydel plant that captures the energy of the flowing water.

Additional Information: Types of Hydroelectric Power

Hydroelectric power plants are categorized based on their generating capacity:

  • Large Hydro: Projects with a capacity of more than 30 MW (Megawatts).
  • Small Hydro: Projects with a capacity between 1 MW and 30 MW.
  • Mini Hydro: Projects with a capacity between 100 kW (Kilowatts) and 1 MW. The question likely refers to this scale or even smaller.
  • Micro Hydro: Projects with a capacity of less than 100 kW. These are often used for individual homes or small communities, fitting the description of using small streams.
  • Pico Hydro: Projects with a capacity of just a few kilowatts or even watts.

Mini and micro hydel plants are particularly suitable for remote mountainous areas where grid connectivity is difficult, as they can utilize local water resources like streams and small waterfalls.

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