PTU Punjab Technical University B-Tech May 2019 Question Papers 5th Semester Electrical and Electronics Engineering (EEE)-EE-Electrical Engineering
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EE)(2011 Onwards)/(EE)PT
B.Tech.(Electrical & Electronics)(2011 & 2012 Batch) (Sem.?5)
ELECTRIC GENERATION & ECONOMICS
Subject Code : BTEE-502
M.Code : 70555
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1)
Answer briefly :
a) What is Mass curve?
b) What is the significance of Lagrange's multiplier in economic operation of steam
plants?
c) What is a reservoir?
d) Draw the single line diagram of hydro power station.
e) Differentiate between : Power and Power factor.
f) List the objectives of tariff making.
g) What is the need of load forecasting?
h) Differentiate between: Base load and Peak load plants.
i) Define `Run-off'. How is it measured?
j) What are co-ordination equations?
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SECTION-B
2)
Hydro-electric plant costs Rs. 300 per kW of installed capacity. The total annual charges
consist of 5% interest; depreciation at 2%; operation and maintenance at 2%; and
insurance, rent, etc. 1.5%. Determine a suitable two-part tariff if the losses in
transmission and distribution are 12.5% and diversity of load is 1.25. Assume that
maximum demand on the station is 80% of the capacity annual load factor is 40%. What
is the overall cost of generation per kWh?
3)
What are the factors that affect the site selection for the steam plants?
4)
Explain the heat rate curve and incremental production cost curve with reference to
Steam units.
5)
A load having maximum peak of 150MW can be supplied by either a hydro electric plant
or a steam power plant. The costs are as follows :
Capital cost of steam plant = Rs. 700 per kW installed
Capital cost of hydro-electric plant = Rs. 1600 per kW installed
Operating cost of steam plant = Rs. 0.03 per kWh
Operating cost of hydro-electric plant = Rs. 0.006 per kWh
Interest on capital costs 8%. Calculate the minimum load factor above which the
hydro-electric plant will be more economical.
6)
What are the commonly used types of tariffs? Discuss these clearly specifying the
applicability or suitability of each tariff.
SECTION-C
7)
a) It is desired to correct the power factor to 0.96 by means of static capacitors
connected across each phase of a 3-phase, 440V, 50Hz motor installation having a
maximum load of 50kVA at a power factor of 0.78. What must be the capacity of
each delta connected condenser?
b) What are the environmental problems associated with nuclear power plants?
8)
a) Explain in detail, the thermal dispatch problem with network losses. Also, discuss the
applicability of lambda iteration method to solve this problem. What is the
significance of penalty factor?
b) Discuss the Topping and Bottoming cycles related to cogeneration.
9)
An electric supply undertaking has a maximum demand of 85 MW with an annual load
factor of 52%. The capital cost of distribution is Rs. 1800000 with a diversity factor of
1.4. The capital cost of transmission is Rs. 2000000 with a diversity factor of 1.28. The
efficiency of transmission system is 88% and that of distribution is 90%. The generating
cost inclusive of capital cost is Rs. 78 per kW of maximum demand plus 2.5 Paise per
kWh. Calculate the annual cost per kW of maximum demand and the cost per kWh
supplied (i) at the substation, (ii) at the consumer's premises.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 04 November 2019