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Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE) PDF Download

Q1: The expressions of fuel cost of two thermal generating units as a function of the respective power generation PG1 and  PG2 are given as
Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)where aa is a constant. For a given value of a, optimal dispatch requires the total load of 290 MW to be shared as  PG1 = 175MW and  PG2 = 115MW. With the load remaining unchanged, the value of a is increased by 10% and optimal dispatch is carried out. The changes in  PG1 and the total cost of generation, F(=F1 + F2) in Rs/hour will be as follows.      (2023)
(a) PG1PG1 will decrease and F will increase
(b) Both PG1 and F will increase
(c) PG1 will increase and F will decrease
(d) Both PG1 and F will decrease
Ans:
(a)
Sol: Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)For optimal dispatch,
IC1 = IC2
0.2aPG1 + 40 = 0.4PG2 + 30  
Given:
Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)Economic scheduling,
Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE)Now, if a increases by 10%, Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE) should be decreases and total cost of generation increases.

Q2: Base load power plants are
P: wind farms.
Q: run-of-river plants.
R: nuclear power plants.
S: diesel power plants.     (SET-1(2015))
(a) P, Q and S only
(b) P, R and S only
(c) P, Q and R only
(d) Q and R only
Ans: 
(d)

Q3: Out of the following plant categories
(i) Nuclear
(ii) Run-of-river
(iii) Pump Storage
(iv) Diesel
The base load power plant are     (2009)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (i), (iii) and (iv)
Ans
: (a)
Sol: Pumped storage plants and diesel stations supply power during peak loads.
NOTE: Base load-plant
(i) Low operating cost
(ii) Capability of working continuously long period.

Q4: For harnessing low variable waterheads, the suitable hydraulic turbine with high percentage of reaction and runner adjustable vanes is       (2004)
(a) Kaplan
(b) Francis
(c) Pelton
(d) Impeller
Ans: 
(a)
Sol: Kaplan is used for run-of-river and poundage stations with heads of upto 70 m (low head). This type has an axial-flow rotor with variable-pitch blades.

Q5: In the thermal power plants, the pressure in the working fluid cycle is developed by       (2004)
(a) condenser
(b) super heater
(c) feed water pump
(d) turbine
Ans:
(c)
Sol: NOTE:
Condenser : The function of condenser are
(i) To provide vaccum at outlet of steam turbine.
(ii) To condense the steam ams pass on the condensate to boiler feed.
Super heater is a device used to convert saturated steam or wet steam into dry steam used for power generation process. 

The document Previous Year Questions- Generating Power Stations | Power Systems - Electrical Engineering (EE) is a part of the Electrical Engineering (EE) Course Power Systems.
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FAQs on Previous Year Questions- Generating Power Stations - Power Systems - Electrical Engineering (EE)

1. What are the main types of power generation used in electrical engineering?
Ans. The main types of power generation include thermal power generation (using fossil fuels), hydroelectric power generation (using water flow), wind power generation (using wind turbines), solar power generation (using solar panels), and nuclear power generation (using nuclear reactions). Each type has its advantages and disadvantages in terms of efficiency, environmental impact, and cost.
2. How does a thermal power plant work?
Ans. A thermal power plant works by converting heat energy, usually from burning fossil fuels, into mechanical energy through steam turbines. The process begins with the combustion of fuel to produce heat, which is used to boil water and create steam. This steam drives the turbine connected to a generator, producing electricity. After passing through the turbine, the steam is cooled and condensed back into water, ready to be reheated in a continuous cycle.
3. What are the advantages of renewable energy sources in power generation?
Ans. Renewable energy sources, such as solar, wind, and hydro, have several advantages, including sustainability, reduced greenhouse gas emissions, and lower long-term operational costs. They also contribute to energy security by diversifying the energy supply and can lead to job creation in the renewable energy sector. Additionally, many renewable sources are abundant and inexhaustible.
4. What is the role of a power transformer in a power generation system?
Ans. A power transformer plays a crucial role in a power generation system by stepping up or stepping down the voltage levels for efficient transmission and distribution of electricity. When generated, electricity is often at a low voltage; transformers increase this voltage for transmission over long distances, reducing energy losses. At the distribution end, transformers reduce the voltage to safer levels for consumer use.
5. What are the major challenges faced in power generation today?
Ans. Major challenges in power generation today include the need for transitioning to cleaner energy sources to combat climate change, managing the intermittency of renewable energy, ensuring grid stability and reliability, and addressing the aging infrastructure of existing power plants. Additionally, there are economic factors, regulatory pressures, and the need for technological innovation to improve efficiency and reduce costs.
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