# DC Distribution Calculations of Electrical Power - MCQs with Answers

## DC Distribution Calculations of Electrical Power - MCQs with Answers

Q1. What will be the pd at point B if a pd of 300 V is maintained at a point A, for a 2 wire dc distributor cable AB if 2 km long and supplies loads of 100A, 150A, 200A, and 50A suited at 500m, 1000m, 1600m, and 2000m from the feeding point A. Each conductor has a resistance of 0.01 Ω per 1000 m. a. 288 V
b. 287.6 V
c. 295.36 V
d. 291.2 V

Q2. What is the loss factor in a distribution system?

Q3. A 2 wire dc street mains AB, 600 m long is fed from both ends at 220 V. Loads of 20 A, 40 A, 50 A and 30 A are tapped at distances 100m, 250m, 400m and 500m from the end A. If the area of cross section of distributor is 1 cm2, what will be the minimum consumer voltage? If ? = 1.7 * 10-6 Ω cm. a. 220 V
b. 215.69 V
c. 218.36 V
d. 222.58 V

Q4. A distribution system is shown in figure with load currents as marked. The two ends of the feeder are fed by voltage sources such that Vp = Vq = 3 V, the value of the voltage Vp for a minimum voltage of 220 V at any point along the feeder is a. 225.89 V
b. 222.89 V
c. 220.0 V
d. 228.58 V

Q5. A uniformly loaded dc distributor is fed at both ends with equal voltages. In comparison to a similar distributor fed at one end only, what will be the maximum voltage drop?

a. One fourth
b. Half
c. One third
d. One sixth

Q6. A uniformly loaded dc distributor is fed at both ends with equal voltages. In comparison to a similar distributor fed at one end only, what will be the drop at the midpoint be?

a. One fourth
b. Half
c. One third
d. One sixth

Q7. Installation of capacitors at suitable locations and of optimum size in a distribution system results in

i. Improved voltage regulation.
ii. Reduction in distribution power losses.
iii. Reduction of kVA rating of distribution transformers.

Which among the following is/are the correct codes?

a. i only
b. i and ii only
c. all of these
d. iii only