DC Distribution

Question 30

A DC 2 wire Distributor ab is 500 m along and is fed at both ends at 240 volt .  the distributor is loaded as diagram . the resistance of distribute ( go and return )  is 0.001 Ohm per metre. calculate (1) the point of minimum voltage and (2) the value of this voltage .

Question 47

A 3 wire DC distribution 250 m long is supplied at end P at 500/ 250 volt and is loaded as under . 

 positive side : 20 ampere 150 m from P ,  30 ampere 250 m from p , 

negative side 24 ampere from P ,  36 ampere 220 m from p , 

 the resistance of each outer wire is 0.02 Ohm per 100 meter and the cross- section of the middle wire is one half that of the outer . find the voltage across each load point .

Question 39

 In DC network A is the feeding point and is maintained at 250 volt . the resistance of the various branches (go and return) are indicate in the figure . determine the current in each point per branch ?

Question 31

A 2 wire DC distributor AB is 300 meters long . the end A is fed at 205 volt and end B at 200 volt . the distributor is uniformly loaded at 0.15 ampere per metre length and has connected load of 50 ampere , 60 ampere ,  and 40 ampere at points distance 75 , 175 ,  225 meter respectively from the end A .the resistance of each conductor is 0.15 ohm per  kilometre . calculate (1) the point of minimum potential , (2) currents fed at end A and B .

Question 32

A DC 2 wire distributor AB is 450 meter long and is fed at both ends at 250 volt . The distributor is loaded as diagram. The resistance of each conductor is 0.05 ohm per kilometre. Find the point of minimum potential and its potential .

Question 14

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