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
- Heat exchangers
- Multistage compression
- Reheating
- 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:
- 60 – 80%
- 45 – 80%
- 30 – 45%
- 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
- Bounce back most of the neutrons that escape from the fuel core
- Reduce the speed of the neutrons
- Stop the chain reaction
- 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
- Geothermal
- Nuclear
- Tidal
- 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:
- Load factor and diversity factor should be high
- Load factor should be high and diversity factor should be low
- Load factor should be low and diversity factor should be high
- Load factor and diversity factor should be low
Correct answer: 1. Load factor and diversity factor should be high
More MCQs in Electrical Engineering:
- Basic Electrical Laws and Theorems
- Basic Voltage and Current MCQs
- High Voltage Engineering MCQs
- Induction Motor MCQs
- Power Electronics
- Power Distribution MCQs
- Power Generation MCQs
- Power System Protection MCQs
- Power Transmission and Distribution MCQs
- Synchronous Generator MCQs
- Synchronous motor MCQs
- Transformer MCQs