Department of
Electrical
Engineering
Q 1:
Date:29th
April. 2022
Due Date: 8th
May. 2022
Marks: 60
Power Distribution & Utilization
Section-A
Assignment – 1
(CLO-2)
A 2-wire d.c. distributor AB having 530 metres in length is fed from point A and is loaded as under :
Distance from feeding point A (in metres)
Load (amperes)
150
20
340
40
420
40
530
50
The specific resistance of copper is 1·7 × 10−8 Ωm,
Analyze the above Distribution scheme for the correct estimate of the cross-section of each wire in order that
the voltage drop in the distributor shall not exceed 10 volts ?
Q 2:
(CLO-2)
A 250 m, 2-wire d.c. distributor fed from one end is loaded uniformly at the rate of 0·8 A per metre. The
resistance of each conductor is 0·0002 Ω per metre.
Analyze the distribution scheme for the necessary voltage at the feeding point to be maintained as 250 V at
the far end of the distributor.
Q 3:
(CLO-2)
A d.c. distributor AB is fed at both ends. At feeding point A, the voltage is maintained at 235 V and at B
at 236 V. The total length of the distributor is 200 metres and loads are tapped off as under :
20 A at 50 m from A
40 A at 75 m from A
25 A at 100 m from A
30 A at 150 m from A
The resistance per kilometre of one conductor is 0·4 Ω.
Analyze the above DC Distribution Scheme for the minimum voltage and the point at which it occurs.
Q 4:
(CLO-2)
A two conductor main AB, 500 m in length is fed from both ends at 250 volts. Loads of 50 A, 60 A, 40
A and 30 A are tapped at distance of 100 m, 250 m, 350 m and 400 m from end A respectively.
The X-section of conductor be 1 cm^2 and specific resistance of the material of the conductor is 1·7 μ Ω cm.
Analyze the above distribution scheme for the minimum consumer voltage and the Maximum Voltage drop
ove the distributor.
Q 5:
(CLO-2)
A 2-wire d.c. distributor AB is 300 metres long. The end A is fed at 205 V and end B at 200 V. The
distributor is uniformly loaded at 0·15 A/metre length and has concentrated loads of 50 A, 60 A and
40 A at points distant 75, 175, 225 m respectively from the end A. The resistance of each conductor
is 0·15 Ω per kilometre.
Analyze the above distribution scheme for following parameters;
(i) The point of minimum potential
(ii) The Value of minimum potential
(iii) The currents fed at ends A and B
Q 6:
(CLO-2)
A d.c. 2-wire distributor AB is 450 m long and is fed at both ends at 250 V. The distributor is loaded as
shown in Fig. No.1. The resistance of each conductor is 0·05 per km.
Analyze the above distribution scheme for following parameters;
(i) The point of minimum potential
(ii) The Value of minimum potential
(iii) The currents fed at ends A and B
Fig. No. 1