Duty and Delta

JKSSB Junior Engineer (Civil) · Irrigation Engineering · 9 practice questions with answers and explanations: 5 Easy, 4 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The duty of water is the:

  1. Area irrigated per unit discharge of water
  2. Time taken to irrigate a field
  3. Depth of water applied to a crop
  4. Volume of a reservoir
Show answer

Answer: A. Duty is expressed in hectares per cumec over the base period.

Sample Easy question 2

The delta of a crop is the:

  1. Area irrigated per cumec
  2. Discharge of the canal
  3. Total depth of water required by the crop during its base period
  4. Time between two watering
Show answer

Answer: C. It is the depth of water, measured over the whole field, needed by the crop.

Sample Easy question 3

The relation between delta, duty and base period is:

  1. Δ = 864 B × D
  2. Δ = 8.64 D ÷ B
  3. Δ = 8.64 B ÷ D
  4. Δ = B ÷ (8.64 D)
Show answer

Answer: C. Δ is in metres, B in days and D in hectares per cumec.

Sample Medium question 4

A crop with a base period of 90 days needs a delta of 0.9 m. The duty is:

  1. 8,640 hectares per cumec
  2. 864 hectares per cumec
  3. 100 hectares per cumec
  4. 86.4 hectares per cumec
Show answer

Answer: B. D = 8.64 × B ÷ Δ = 8.64 × 90 ÷ 0.9 = 864.

Sample Medium question 5

A canal commands 2,000 hectares at a duty of 1,000 hectares per cumec. The discharge needed at the field is:

  1. 0.2 cumec
  2. 20 cumec
  3. 2,000 cumec
  4. 2 cumec
Show answer

Answer: D. Q = area ÷ duty = 2,000 ÷ 1,000 = 2 cumec.

Sample Medium question 6

A crop with a base period of 110 days and a duty of 1,100 hectares per cumec has a delta of:

  1. 0.864 m
  2. 0.0864 m
  3. 86.4 m
  4. 8.64 m
Show answer

Answer: A. Δ = 8.64 × B ÷ D = 8.64 × 110 ÷ 1,100 = 0.864 m.

More Irrigation Engineering topics for JKSSB Junior Engineer (Civil)