# Electrical Power Generation MCQs Part 39

Electrical Engineering MCQs on Power Generation MCQs Part 39

Contents

## For maximum efficiency Gas turbine power plants have

Gas turbine power plants for maximum efficiency may have

1. Heat exchangers
2. Multistage compression
3. Reheating
4. All of these

Correct answer: 4. All of these

Explanation: In order to achieve maximum efficiency, gas turbine power plants utilize heat exchangers, multistage compression and reheating. The reheating process utilizes the heat of exhaust gases to heat the compressed air before it is sent to the combustion chamber. It reduces the fuel consumption of the plant and improves the efficiency to maximum possible value. For multistage compression, the inlet temperature of turbine and pressure rate increases, the heat supplied as well as the heat rejected are reduced. However, the rate of change of heat supplied as well as the heat supplied is not same as the rate of change heat rejected. As a result, there exists an optimum pressure ratio producing maximum efficiency for a given turbine inlet temperature.

## In case of steam power plant, the efficiency of Rankine cycle is

In case of steam power plant, the efficiency of Rankine cycle is:

1. 60 – 80%
2. 45 – 80%
3. 30 – 45%
4. 20 – 30%

Correct answer: 3. 30 – 45%

Explanation: In case of steam power plant the efficiency of Rankine cycle is in the range of 30-45%. The efficiency of the Rankine cycle is limited by the high heat of vaporization of working steam.

See also: Coal power plant

## The function of reflector in nuclear power station is to

The function of reflector in nuclear power station is to

1. Bounce back most of the neutrons that escape from the fuel core
2. Reduce the speed of the neutrons
3. Stop the chain reaction
4. None of above

Correct answer: 1. Bounce back most of the neutrons that escape from the fuel core

Explanation: The reflector is nuclear power plant is a layer of material immediately surrounding a reactor core that scatters back (or reflects) into the core many neutrons that would otherwise escape. The presence of reflector in a plant results in returned neutrons that can then cause more fissions and improve the neutron economy of the reactor. This in turn conserves the nuclear fuel as the low speed neutrons thus returned are useful in continuing the chain reaction.

## Which of following is not a conventional energy source

Which of following is not a conventional energy source

1. Geothermal
2. Nuclear
3. Tidal
4. Wind

Correct answer: 4. Wind

## In order to have lower cost of electrical power generation

In order to have lower cost of electrical power generation:

1. Load factor and diversity factor should be high
2. Load factor should be high and diversity factor should be low
3. Load factor should be low and diversity factor should be high
4. Load factor and diversity factor should be low

Correct answer: 1. Load factor and diversity factor should be high

More MCQs in Electrical Engineering: