Electrical Power Generation MCQs

Electrical Power Generation MCQs let you test your knowledge of various conventional and non-conventional electric generation units. The multiple-choice questions are targetted on Hydroelectric, steam, coal, nuclear, gas, wind, solar, and other renewable as well as non-renewable sources of electrical power. Various MCQs on components, machines, devices, and structures let you evaluate your own knowledge before appearing in Entry tests, competitive exams, university, and college tests as well as for job interviews.

The primary source of energy in the universe is

The primary source of energy in the universe is:

  1. Fuels
  2. Wind
  3. Water
  4. Sun

Correct answer: 4. Sun

Explanation: The most important & primary source of energy is the sun. Sun is responsible for heating the earth’s surface and the Earth heats the air above it, thus resulting in the wind. Water evaporated by the sun forms clouds. The rain results in flowing streams and rivers that in turn provide hydropower.

The largest source of power generation at present

The largest source of power generation at present:

  1. Coal
  2. Nuclear
  3. Water
  4. Oil

Correct answer: 1. Coal


2019 world electricity generation by source (total generation was 27 PWh)

  1. Coal (37%)
  2. Natural gas (24%)
  3. Hydro (16%)
  4. Nuclear (10%)
  5. Wind (5%)
  6. Solar (3%)
  7. Other (5%)

Source: https://www.iea.org/data-and-statistics/charts/world-gross-electricity-production-by-source-2019

Alternator converts ____________ to __________

Alternator converts ____________ to __________:

  1. Mechanical, Electrical (AC)
  2. Electrical (AC), Mechanical
  3. Mechanical, Electrical (DC)
  4. Electrical (DC), Mechanical

Correct answer: 1. Mechanical, Electrical (AC)

Explanation: An alternator is an electrical generator or an electrical machine that converts mechanical energy to electrical energy in the form of an alternating current. The alternator is also known as a synchronous generator. Continue Reading: Synchronous generator MCQs.

The term pulverized features the fuel of

The term pulverized features the fuel of:

  1. Gas power station
  2. DAM
  3. Steam power station
  4. Wind turbine

Correct answer: Steam power station

Explanation: Pulverization also known as crushing or grinding is defined as the process of applying an external force to coal in order to reduce it into pieces that are smaller than the original size. Pulverization of coal is the favored method since it prepares the coal for burning purposes.

The mechanical pulverization of coal into a fine powder enables it to be burned like a gas, thus leading to its efficient combustion. The term pulverization features the fuel of a steam power station. In steam power station pulverization of coal is carried out before combustion.

Low heads employ

Low heads employ:

  1. Impulse turbine
  2. Francis turbine
  3. Propeller turbine
  4. Pelton turbine

Correct answer: 3. Propeller turbine

Explanation: Propeller turbine belongs to the class of reaction turbines. Such turbines are generally used for sites with lower head and higher flows. The propeller turbine generally has a runner with three to six blades.

Impulse turbines are generally suitable for high-head, low-flow applications. Francis turbines are usually recommended for medium- to high-head (130- to 2,000-foot) and their use for low heads is rare. Pelton turbine is actually a type of impulse turbine and is generally recommended for high head power plants.

Spillway belongs to which structure

Spillway belongs to which structure:

  1. Hydroelectric power plant
  2. Steam power station
  3. Nuclear power station
  4. Wind turbine

Correct answer: 1. Hydroelectric power plant

Explanation: Spillway belongs to the hydroelectric power plant and it is a structure constructed in a hydroelectric dam in order to provide a safe path for floodwaters to escape to some downstream area.

Read more EEMCQs here

The condenser in which there is no direct contact between steam and water

The condenser in which there is no direct contact between steam and cooling water:

  1. Jet condenser
  2. Surface condenser
  3. Both of these
  4. None of these

Correct answer: 2. Surface condenser

Explanation: A surface condenser is a heat exchanger that converts steam from gaseous to its liquid state at a pressure below atmospheric pressure. A surface condenser is a water-cooled shell and tube heat exchanger that is installed to condense exhaust steam from a steam turbine in thermal power stations.

In a jet condenser, the cooling water and steam are mixed up, however in a surface condenser steam and cooling water are not mixed up.

The analysis which provides the complete chemical analysis of coal

The analysis which provides the complete chemical analysis of coal:

  1. Ultimate analysis
  2. Proximate analysis
  3. Breath analysis
  4. Life cycle analysis

Correct answer: 1. Ultimate analysis

Explanation: The ultimate analysis of coal involves the determination of the weight percent of carbon as well as sulfur, nitrogen, and oxygen. Trace elements that occur in coal are typically included as a part of the ultimate analysis. The ultimate analysis of coal provides a convenient method for reporting the major organic elemental composition of coal.

Which of the following doesn’t belong to full admission turbine

Which of the following doesn’t belong to full admission turbine:

  1. Propeller
  2. Francis
  3. Kaplan
  4. Pelton

Correct answer: 4. Pelton

The direction of turbines is reversed in

The direction of turbines is reversed in:

  1. Run-of-the-river plants
  2. Pumped storage plants
  3. Storage plants
  4. None of these

Correct answer: 2. Pumped storage plants

Explanation: Pumped-storage power plants are reversible hydroelectric facilities wherein water is pumped uphill into a reservoir.

During times when there is very high electricity consumption on the grid, the water from the upper reservoir, carried downhill by a penstock, drives a turbine and a generator in order to generate electric power is used for meeting the increased demand.

However, when demand is low the electricity is taken from the grid to power a pump. The pump sends water from the lower reservoir back up to the upper reservoir. Once in the upper reservoir, water can be discharged again to drive the turbine. In this manner water in the upper reservoir constitutes a stock of gravitational potential energy that can be used when needed.

The turbines in the pumped storage plant could operate as both turbine-generators and in reverse as electric motor-driven pumps.

Watch the working of pumped storage plants in below video:

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