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Electric Power Generation MCQs

Electric Power Generation MCQs

Energy is the fundamental requirement for our economic development. In our surroundings, energy exists in different forms, however, the most important form of energy is electrical energy. Electrical energy is superior is all other forms of energy since it is convenient, can be easily controlled, has greater flexibility, is a clear source of energy, and can be efficiently transmitted to large distances. The energy around us is available in various forms in nature. The list of energy sources includes sun, wind, water, fuels, and nuclear energy. The conversion of energy available in different forms to electrical energy is known as Electric Power Generation. In this article, MCQs.net provides the Top 10 Electric power generation MCQs.

Electrical Energy is superior to all forms of energy since

Electrical Energy is superior to all forms of energy since:

  1. It is a convenient form of energy
  2. It provides easy control
  3. It has high transmission efficiency
  4. All of these

Correct answer: 4. All of these

Explanation: Electrical energy is superior to all forms of energy due to following reasons:

  1. Electrical energy is most Convenient: It is most convenient form of energy that can be conveniently converted to other forms. It can be converted into heat, light and mechanical forms of energy.
  2. Easy control operations: It provides easy control and operations. As an example, we can easily switch on and off the fan very easily.
  3. High transmission efficiency: Electrical power consumers are located away from power generation stations. Compared to other power sources, the transmission of electrical energy is most efficient and electric energy can be transmitted to large distances with high efficiency.
  4. Clean energy source: Electrical energy is not linked to smoke, gases, or fumes and it ensures cleanliness of operations.
  5. Flexibility: Electrical energy is given preference since it is greatly flexible. It can be transported from one place to another very easily using conductors and is most flexible option when it comes to transmission, distribution, operations, and control.

Unit of mechanical energy is

Unit of mechanical energy is:

  1. newton-meter
  2. watt
  3. calorie
  4. C.H.U

Correct answer: 1. newton-meter

Explanation: The unit of mechanical energy is newton meter or joule. Work done on body is one-newton meter if a force of one newton moves it through distance of one meter.

Watt-sec is a unit of electrical energy.

Calorie is defined as the heat required to raise the temperature of 1 gm of water by 1 degree.

C.H.U is an abbreviation for centigrade heat units. 1 C.H.U is the amount of heat energy required to raise the temperature of 1 lb of water by 1ºC.

Mathematically: 1 C.H.U. = 1 lb × 1ºC

The primary source of energy around us is

The primary source of energy around us is:

  1. Water
  2. Wind
  3. Sun
  4. Nuclear power

Correct answer: 3. Sun

Explanation: The sun is the primary source of energy around us.

The wind itself is caused due to sun. The sun heats earth’s surface and the earth heats the air above it causing wind.

Water evaporated by the sun forms clouds and rain thus giving us flowing streams and rivers.

The commercial unit of electrical energy is

The commercial unit of electrical energy is:

  1. joule
  2. kWh
  3. B.Th.U
  4. calorie

Correct answer: 2.kWh

Explanation: The commercial unit of electrical energy is the kilowatt-hour (kWh). This is the unit used for commercial purposes. The electricity bill at our homes is charged in kWh. 1 kW h = 3.6 × 106 J

The power station which converts heat energy of coal to electrical energy is

The power station which converts heat energy of coal to electrical energy is:

  1. Nuclear power station
  2. Steam power station
  3. Diesel power station
  4. Hydro power station

Correct answer: 2. Steam power station

Explanation: The steam power station is a power generating station that converts heat energy from coal combustion into electrical energy. The working of a steam power station is based on the Rankine cycle. In this power station, steam is produced in boiler by utilizing heat of coal combustion. The produced steam is expanded in the prime mover and is condensed using condenser in order to fed again to boiler. The steam turbine then drives alternator which converts mechanical energy into electrical energy.

The least efficient power station is

The least efficient power station is:

  1. Nuclear power station
  2. Steam power station
  3. Nuclear power station
  4. Hydro power station

Correct answer: 2. Steam power station

Explanation:

Of all power plants, steam power plant is the least efficient power plant. Overall efficiency of steam power plant is about 25%

A nuclear power plant is more efficient than steam power station

Diesel power plant is more efficient than steam power station. Its Efficiency is about 35%

Of all mentioned plants above hydropower plant is most efficient. It’s overall efficiency is about 85%.

The power station with highest standby losses is

The power station with highest standby losses is:

  1. Nuclear power plant
  2. Steam power plant
  3. Diesel power plant
  4. Hydropower plant

Correct answer: 2. Steam power plant

Explanation: The steam power plant is the power plant that has the highest standby losses. Since its boiler remains in operation even when the turbine is not working.

Compared to steam power station nuclear and diesel power plants have fewer losses. While hydroelectric power plant has no standby losses.

The term reactor is associated to which of following power plants

The term reactor is associated to which of following power plants

  1. Diesel power plant
  2. Steam power plant
  3. Nuclear power plant
  4. Hydropower plant

Correct answer: 3. Nuclear power plant
Explanation: The nuclear power plant is a type of power plant in which energy is converted into electrical energy. In a nuclear power station, Uranium is subject to nuclear fission. The term nuclear fission refers to the breaking of nuclei of heavy atoms into two nearly equal parts releasing a huge amount of energy. The reactor is a special type of apparatus in which nuclear fission is carried out.

Thermal efficiency of steam power plant is around

Thermal efficiency of steam power plant is around:

  1. 13.5%
  2. 28%
  3. 33.9%
  4. 52%

Correct answer: 2. 28%

The basic unit of energy is

The basic unit of energy is

  1. joule
  2. watt
  3. joule/s
  4. watt/s

Correct answer: 1. Joule

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