COMSATS university Islamabad, Abbottabad Campus
Department of Electrical Engineering
Mid Term Paper / Fall 2022
Class: EPE 7 (A&B) Date: 17 /11/ 2022
Subject: Power generation
Instructor: Engr. Sifat Ali Shah
Time Allowed: 1. 5 hours Max Marks: 50
Name:___________________ Reg. No#________________
Course Learning Program Learning Domain / Level
Question Objective Objective Justification
(CLO) (PLO)
1 CLO-0 PLO-0 - MCQs
2 CLO-1 PLO-1 Cognitive/ Fundamentals and explanation of term in
C2 electrical power generation
Cognitive/ Analysis and design of power generation plant
3 CLO-2 PLO-2 C4
Section -A ( 25 marks )
Q1. Select and choose the correct answer of the following
1. The connected load is generally ---------- than maximum demand
2. Load factor is the ratio of – (a) average load to maximum load (b) maximum load to
demand factor (c) average load to minimum load
3. The plot, time in hours against discharge in m2/sec. the obtain curve is known as
(a) daily load curve (b) hydrograph curve (c) monthly load curve
4. To let the water into conduit pipe is called
(a) Spill way gate (b) forebay (c) intake gate (d) penstock
5. The area under the daily load curve gives ...... (i) Average load, (ii) maximum demand,
(iii) units generated per day
6 . The function of a moderator is to----- (a) absorb the part of the Kinetic energy of the neutrons
(b) extract the heat (c) reflect back some of the neutrons (d) start the reactor
7. Moderator is not required in ------------
(a) Pressurized water reactor (b) Gas cooled reactor (c) Boiling water reactor (d) Breeder reactor
8. 1 amu is equal to -----------MeV
9. In PWR ---------- is use as moderator (a) graphite (b) CO2 (c) H2O
10. In all modern power station the generator used is of ------------poles
(a) 4 poles (b) 2poles (c) 6poles
11. The steam is supplied to the turbine, where it is ------------------
(a) Condense (b) expand (c) contract
12. Generally ----------- tube boiler are used for producing electric power station
13. The coal size of ----------- mm and below are allowed to pass through it.
14. The water treatment plant mainly comprises------ system
15. Economizers’ are used to heat ........ (a) air (b) feed water (c) steam
16. UGC, where we convert coal in to gas called----------.
17. In a steam power plant ,the water treatment plant the maximum silica content---------
18. A steam condenser is basically a (a) Boiler (b) Condenser (c) Heat exchanger
19. Deuterium oxide is used in nuclear reactors as--
(a) fuel (b) moderator (c) shield (d) regulator
20. A sodium graphite reactor uses
(a) sodium as moderator and graphite as coolant (b) sodium as coolant and graphite as moderator
(c) a mixture of sodium and graphite as coolant (d) a mixture of sodium and graphite as
moderator.
21. A fast breeder reactor
(a) operates with fast neutrons and produces less fissionable material than it consumes
(b) operates with fast neutrons and produces more fissionable material than it consumes
(c) operates with slow neutrons and produces less fissionable material than it consumes
(d) operates with slow neutrons and produces more fissionable material than it consumes
22. In a fast breeder reactor , neutron shielding is provided by the use of ----
(a) boron (b) light water (c) graphite (d) all of them
23.The equipment installed in power plants to reduce air pollution due to smoke is----
(a) Induced draft fans (b) De-super heaters (c) Electrostatic precipitators (d) Re-heaters.
24. Steam pressures usually used in thermal power plants are-------
(a) 5 kg/cm2 to 10 kg / cm2 (b) 17 kg/cm2 to 167.5 kg / cm2
(c) 17 kg/cm2 to 170 kg / cm2 (d) 70 kg/cm2 to 215 kg / cm2
25. water treatment in a steam power station, the maximum iron and copper content----------------
Section B (12+12 = 24 marks )
Q2 (A) A steam power station spends Rs. 30 lakhs per annum for coal used in the station.
The coal has a calorific value of 5000 kcal/kg and costs Rs. 300 per ton.
If the station has thermal efficiency of 33% and electrical efficiency of 90%,
find the average load on the station
(B) Explain with a neat sketch the various (main) parts of a nuclear reactor
Section -C (12+14 = 26 marks )
Q3 (A) The weekly discharge of a typical hydroelectric plant is as under :
Day Sun Mon Tues Wed Thurs Fri Sat
Discharge(m3/sec) 500 520 850 800 875 900 546
The plant has an effective head of 15 m and an overall efficiency of 85%. If the plant
operates on 40% load factor,
estimate
(i) the average daily discharge
(ii) pondage required and
(iii) installed capacity of proposed plant.
(B) A power station has to meet the following demand :
Group A : 200 kW between 8 A.M. and 6 P.M.
Group B : 100 kW between 6 A.M. and 10 A.M.
Group C : 50 kW between 6 A.M. and 10 A.M.
Group D : 100 kW between 10 A.M. and 6 P.M.
and then between 6 P.M. and 6 A.M.
(i) Plot the daily load curve and determine
(ii) diversity factor
(iii) units generated per day
(vi) load factor.
