Question

Match List-I with List-II and select the most appropriate answer using the codes given below the list:

List-I	List-II
A. Hourly peak demand is	1. 180% of average demand
B. Daily peak demand is	2. 270% of average demand
C. Monthly peak demand is	3. 100% of average demand
D. Yearly peak demand is	4. 128% of average demand

1. A-1, B-2, C-4, D-3
2. A-4, B-3, C-2, D-3
3. A-2, B-1, C-4, D-3
4. A-1, B-3, C-2, D-4

Answer 1

Correct Answer - Option 3 : A-2, B-1, C-4, D-3

Concept:

(i) Average Daily Demand (q)

Average daily demand = (per capita average consumption in litre/person/day) × population

(ii) Maximum Daily Demand

Maximum daily demand = 1.8 × Avg. daily demand = 1.8 × q

(iii) Maximum Hourly Demand:

Maximum hourly demand of the maximum day i.e. Peak demand

= 1.5 × Avg hourly demand of the maximum day \(= 1.5 × \left[ {1.8 × \frac{q}{{24}}} \right] = 2.7\left[ {\frac{q}{{24}}} \right]\)= 2.7 × annual avg hourly demand

(iv) Monthly peak demand = 1.28 × monthly average demand

(v) Yearly peak = 1.0 × yearly average demand

 The percentage ratio of maximum demand to the average demand can be computed using Good Rich equation;

p = 180 × t-0.10

where

t = time(days)

Demand	Fluctuation
Hourly	2.7
Daily	1.8
Weekly	1.48
Monthly	1.28
Yearly	1

Fluctuation in hourly demand is also termed as Peak factor which depends upon the population as follows;

Population	Peak factor
< 50000	3
50000 - 200000	2.5
> 200000	2