Unit 6
Instrumentation and Economics of Power Plant
- A distribution transformer costing Rs 50,000 has a useful life of 15 years. Determine the annual depreciation charge using straight line method. Assume the salvage value of the equipment to be Rs 5,000.
- The power generation equipment of a power station cost Rs 15,75,000 and has a useful life of 25 years. If the salvage value of the equipment is Rs 75,000 and annual interest rate is 5%, determine annual amount to be saved by sinking fund method.
- A generating station has a maximum demand of 10 MW. Calculate the cost per unit generated from the following data :
Annual load factor = 35% Capital cost = Rs 12,50,000 Annual cost of fuel and oil = Rs 8,00,000 Taxes, wages and salaries = Rs 7,00,000 Interest and depreciation = 10%.
4. A transformer costing Rs 90,000 has a useful life of 20 years. Determine the annual depreciation charge using straight line method. Assume the salvage value of the equipment to be Rs 10,000.
5. A distribution transformer costs Rs 2,00,000 and has a useful life of 20 years. If the salvage value is Rs 10,000 and rate of annual compound interest is 8%, calculate the amount to be saved annually for replacement of the transformer after the end of 20 years by sinking fund method.
6. What is a generator? Explain parts to a generator.
7. Explain types of generator cooling systems in detail.
8. Write and describe types and causes of short circuit.
9. Write short note on:
- Switch gear
- Circuit Breaker
10. Explain protective devices & control system used in power plants.
11. Explain the total cost of electrical energy generated.
12. Explain selection and type of generation.
13. A plant has a connected load of 40 MW and a maximum demand of 20 MW. 73.8 × 106 kWh energy is generated in a year. Calculate: [i] demand factor, [ii] average load, [iii] load factor.
14. Explain Load curve or chronological curve.
