If you are an electrical engineering student studying at SPPU, then you know how important it is to prepare for your exams. Power System 1 is a crucial course in your curriculum, covering the principles of power systems, and it is an essential subject for anyone looking to pursue a career in electrical engineering.
As the Insem exams approach, it is crucial to have a clear idea of what kind of questions to expect and how to prepare for them. To help you with that, Mypractically is providing a comprehensive guide to Power System 1 SPPU Insem Exam Important Questions and Solutions.
Here are some of the critical topics that you should focus on while preparing for the Power System 1 Insem Exam:
(i) Utilization factor of plant can be greater than or less than 1
(Ii) Higher the load factor, lower is the cost of generation
(iii) In two part tariff, consumer with low power factor will be charged more on account of demand charges
2. A generating station has a maximum demand of 500 MW. The annual load factor is 50% and capacity factor is 40%. Find reserve capacity of plant.
3. Explain in brief the necessity and working of the following equipments used in substation: A. Busbar B. Reactor
4. Define cable State various parts of cable and give brief classification of underground cables.
5. Derive the expression for capacitance of single core cable.
6. Prove that gmax/gmin in a single core cable is equal to D/d
7. Explain XLPE cable along with its advantages over other type of cable.
8. A 3 core 3 phase Metal Sheathed cable gave the following results on testing for cables:
(i) capacitance between all conductors shorted and sheathed =0.90 µF
(ii) Capacitance between two conductors shorted with sheath and third conductor 0.40 m
9. Draw neat circuit diagrams in each case and find:
(i) capacitance between each conductor and sheath,Cs (ii) capacitance between two cores.
10. A generating station supplies the following loads: 15,000 kW, 12,000 kW, 8,500kW, 6,000 kW and 450 kW. The maximum demand is 22,000 kW. The annual load factor of the station is 48% Calculate:
(i) Number of units supplied annually
(i) Diversity factor
(ii)Demand factor
Part B.
1.Explain in brief, function and working of the following equipments used in
substation:
(i) Relays
(1) PLCC equipment
2. Write short notes on the following types of tariffs:
(1) Time of the day tariff
(ii) Interruptible tariff.
3. The tariff is Rs. 120 per kVA of maximum demand and 10 paisa per unit consumed. If the load factor is 30%, find the overall cost per unit at:
(i) Unity p.f. and
(ii) 0.8 p.f.
4. Explain what are base loads and peak loads hence explain various features of base load and peak load power stations.
5. Derive an expression for insulation resistance of single core cable hence determine insulation resistance of single core cable of length 3 km long having conductor diameter 25 mm, insulation thickness 10 mm and specific resistance of 5x10`-12 ohm meter
6. A consumer has following connected load: 10 lamps of 60 W each and two [6] heaters of 1000 W each. His maximum demand is 1500 W. On the average he uses 8 lamps 5 hours a day and each heater for 3 hours a day. Find his average load, monthly energy consumption and load factor
7. State necessity of excitation system in power plant hence explain any one
type of excitation system with suitable diagram
8. Calculate annual bill of a consumer whose maximum demand is 100 kW. [6] p.f. 0.8 lagging and load factor of 0.6. the tariff used is Rs. 75/kVA of MD +15 Paise/kWh consumed
9. The maximum demand of consumer is 20 A at 230 V and his total energy consumption is 8760 kWh. If the energy is charged at 3 Rs per unit for 400 Hrs of maximum demand per annum plus 6.5 Rs
per unit for additional units, calculate annual bill
10. Explain in brief, what are base load and peak load plants hence explain advantages of interconnected grid system.
11. A single core, 5 km long cable having core diameter of 0.9 cm and insulation of relative permittivity of 4.2 and 1.1 cm thickness, is connected to 33 kV, 50 Hz supply. Find capacitance of cable also find maximum and minimum stress in insulation.
12.Explain various objectives and characteristics of tariff.
13.Explain function, and operation of the following power plant equipments in brief
(i) Isolators
(ii) PLCC Equipment
14. The test results for 1 km of 3-phase metal sheathed cable gave a measured capacitance of 0.7 pF between one conductor and the other two conductors bunched together with sheath and 1.2 pF measured between the three bunched conductors and the sheath. Find capacitance between two conductors and charging current when cable is connected to 11 kV, 50 Hz supply.
In conclusion, Power System 1 is a crucial course in the electrical engineering curriculum, and it is essential to prepare thoroughly for the Insem Exam. By focusing on the critical topics mentioned above and mastering the underlying concepts, you'll be able to solve numerical problems and answer theoretical questions with ease.
Mypractically's comprehensive guide to Power System 1 SPPU Insem Exam Important Questions and Solutions is an excellent resource that can help you prepare effectively for the exam. By using this guide, you'll have access to a wide range of important questions, along with detailed solutions that can help you understand the underlying concepts and principles.
Remember to stay focused and disciplined in your studies, and practice solving numerical problems regularly to build your confidence and proficiency. With the right preparation and mindset, you can ace the Power System 1 Insem Exam and move closer to your goal of becoming a successful electrical engineer.
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