Power Systems-1 assignment 2015-16

CVR COLLEGE OF ENGINEERING

Assignment no 1

Date of Isuue: 23-02-16                                  Date of submission 01-03-16

1.  1    a) Draw a general layout of modern thermal power plant and explain the working of different    components?

b)      Explain the classification of Hydroelectric power plants according to the head and specify which type of turbines is used

2.      a)  List out the differences between overhead and underground distribution systems

b)      What are the main components of distribution system and explain the design criterion for feeder and distributor

3.     a) With neat sketch explain the operation of Pressurized boiling water Reactor? Explain its merits and demerits? 

b)      With neat diagram explain  Various Components of Nuclear Reactor 

4.     A 2 wire DC distributor AB is fed from both ends. At feeding point A the voltage is   Maintained at 230V and at B 235V.The total length of the distributor is 200 meters and the loads are tapped off as under  25 A at 50m from A    50A at 75m from A  30A at 100m from A 40A at 150m from A. The resistance per kilometre of one conductor is 0.3Ω.Calculate Currents at Various sections of the distributor, Minimum voltage and the point at which it occurs

5.     A single phase Distributer one km long has a resistance and reactance per conductor of 0.1Ω and 0.15Ω respectively. At the far end ,the voltage V_B=200V and the current is 100A at a power factor of 0.8 lagging. At the midpoint M of the distributor a current of 100A is tapped at a p.f of 0.6 lagging with reference to the voltage V_M at the midpoint. Calculate

( i )  Voltage at Mid Point

( ii ) Sending end Voltage V_A

( iii ) Phase angle between V_A and V_B

6.       A single phase ring distributor ABC is fed at A. The loads B and Care 20A at 0.8 p.f lagging and 15A at 0.6p.f lagging respectively; both are expressed with reference to the voltage at A. The load impedance of the three sections AB,BC and CA are (1+j1) ,(1+j2) and (1+j3) ohms respectively. Find the total current fed at A and the current in each section. Use thevenin’s theorem to obtain the result.