gr11d5104ii b. tech ii semester supplementary examinations ... · gr11d5104ii b. tech ii semester...
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SET - 4 CODE: GR11A2024
GR11D5104 GR11D5104
GR11D5104
GR11D5104
GR11D5104
GR 11
II B. Tech II Semester Supplementary Examinations, Nov, 2013
Power Systems - I
(Electrical and Electronics Engineering) Time: 3 hours Max Marks: 75
Answer any FIVE questions
All questions carry equal marks
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1). a Discuss the types of Nuclear reactors and also give the brief description of PWR,
BWR and FBR.
[8]
b Draw the neat general layout of Thermal Power Station.
[7]
2). a Give the classification of different types of Turbine used in power systems.
[8]
b A Pelton wheel is to be designed for the following specifications:
Shaft power = 11,772 kW; Head = 380 meters; Speed = 750 r.p.m. ; Overall
efficiency = 86%; Jet diameter is not to exceed one-sixth of the wheel diameter.
Determine:
The wheel diameter
The number of jets required, and
Diameter of the jet
[7]
3). a How do you solve the single phase AC distribution system in which the power
factors of the load currents are referred to receiving end voltage?
[8]
b In a 3-phase, 4-wire distribution system with 240 volts between lines and neutral
there is a balanced motor load of 250 kW at 0.8 power factor. Lamp loads connected
between respective lines and neutral absorb 25, 75 and 100 kW. Calculate the
current in each line and in the neutral wire of the feeder cable.
[7]
4). a Draw the single line layout of Outdoor substation.
[7]
b List out various bus-bar schemes and explain.
[8]
5). a What is the effect of low power factor on the generating stations?
[8]
b Why is the unity power factor not the most economical power factor?
[7]
6). A residential consumer has a connected load of 15 lamps of 100 W at his premises.
His demand is as follows.
From midnight to 6 AM – 300W
From 6 AM to 6 PM -- No load
From 6 PM to 7 PM -- 600 W
From 7 PM to 10 PM -- 1300 W
From 10 PM to Midnight -- 500 W
[15]
SET - 4 CODE: GR11A2024
GR11D5104 GR11D5104
GR11D5104
GR11D5104
GR11D5104
GR 11
From the above data
a) Plot the load curve
b) Find the energy consumption during 24 hours
c) Calculate the demand factor, average load, maximum load and load factor.
7). Write short notes on:
Advantages and Disadvantages of thermal power station
Air preheater
Condenser
Cooling Towers
Automatic Combustion control systems
Thermal power station control
[15]
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