Questions and answers for exam Preparation

MCQs

Total Questions : 140 | Page 7 of 14 pages

Question 61. Determine the pan evaporation from the following data using the Christiansen method.
Extra-terrestrial radiation in cm = 47.3 cm
Coefficient of temperature(Cₜ) = 1.403
Coefficient for wind velocity (Cw)= 1.2
Coefficient for relative humidity (Cₕ) = 1
Coefficient for percent of possible sunshine(Cₛ) = 1.073
Coefficient of elevation(Cₑ) = 1.014

40 cm
30.44 cm
39.8 cm
37.98 cm

Discuss Question

Answer: Option C. -> 39.8 cm
Answer: (c).39.8 cm

Question 62. Penman’s equation for the estimation of PET has been derived by using ___________

energy balance approach
mass transfer approach
combination of energy balance approach and mass transfer approach
combination of energy balance approach and energy transfer approach

Discuss Question

Answer: Option C. -> combination of energy balance approach and mass transfer approach
Answer: (c).combination of energy balance approach and mass transfer approach

Question 63. Albedo or reflection coefficient factor is used in which method?

Blaney- Criddle equation
Christiansen equation
Penman equation
Tank and Lysimeter method

Discuss Question

Answer: Option C. -> Penman equation
Answer: (c).Penman equation

Question 64. Which method involves the use of crop factor?

Penman’s equation
Hargreaves method
Blaney-Criddle Formula
Tanks and Lysimeter

Discuss Question

Answer: Option C. -> Blaney-Criddle Formula
Answer: (c).Blaney-Criddle Formula

Question 65. What are the dimensions of the standard class-A pan?

Diameter-1.2 m, Depth – 25 cm
Diameter-2 m, Depth – 25 cm
Diameter-2 m, Depth – 30 cm
Diameter-1.2 m, Depth – 30 cm

Discuss Question

Answer: Option A. -> Diameter-1.2 m, Depth – 25 cm
Answer: (a).Diameter-1.2 m, Depth – 25 cm

Question 66. Penman’s equation can also be used to compute evaporation from a water surface like a lake if _________

reflection coefficient = 0.05
reflection coefficient > 0.05
reflection coefficient < 0.05
reflection coefficient = 0.45- 0.90

Discuss Question

Answer: Option A. -> reflection coefficient = 0.05
Answer: (a).reflection coefficient = 0.05

Question 67. What is the consumptive use for a crop in the month of April having a consumptive use coefficient equal to 0.80 and pan evaporation is 35 cm?

28 cm
43.75 cm
35.80 cm
40.80 cm

Discuss Question

Answer: Option A. -> 28 cm
Answer: (a).28 cm

Question 68. What is the correct expression of parameter Eₐ in Penman’s equation?

Ea = 0.35 (1 + V2/160) (es – ea)
Ea = 0.35 (1 + V2/160) (es + ea)
Ea = 0.35 (1 – V2/160) (es – ea)
Ea = 0.35 (1 – V2/160) (es + ea)

Discuss Question

Answer: Option A. -> Ea = 0.35 (1 + V2/160) (es – ea)
Answer: (a).Ea = 0.35 (1 + V2/160) (es – ea)

Question 69. The pan evaporation can also be determined by Christiansen formula.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 70. Compute the total consumptive use for a drainage basin by Penman’s formula. The slope of saturation vapour pressure V/s chart at 40°C is 2.95 mm of Hg/°C and the net incoming solar radiation is 5.705 mm of evaporative water/day. Assume, Eₐ = 18.07 mm/day and Psychrometric constant = 0.49 mm of Hg/°C.