Q.1
Which method involves the use of crop factor?
  • a) Penman’s equation
  • b) Hargreaves method
  • c) Blaney-Criddle Formula
  • d) Tanks and Lysimeter
Q.2
What are the dimensions of the standard class-A pan?
  • a) Diameter-1.2 m, Depth – 25 cm
  • b) Diameter-2 m, Depth – 25 cm
  • c) Diameter-2 m, Depth – 30 cm
  • d) Diameter-1.2 m, Depth – 30 cm
Q.3
Penman’s equation for the estimation of PET has been derived by using ___________
  • a) energy balance approach
  • b) mass transfer approach
  • c) combination of energy balance approach and mass transfer approach
  • d) combination of energy balance approach and energy transfer approach
Q.4
Albedo or reflection coefficient factor is used in which method?
  • a) Blaney- Criddle equation
  • b) Christiansen equation
  • c) Penman equation
  • d) Tank and Lysimeter method
Q.5
Penman’s equation can also be used to compute evaporation from a water surface like a lake if _________
  • a) reflection coefficient = 0.05
  • b) reflection coefficient > 0.05
  • c) reflection coefficient < 0.05
  • d) reflection coefficient = 0.45- 0.90
Q.6
The pan evaporation can also be determined by Christiansen formula.
  • a) True
  • b) False
Q.7
What is the consumptive use for a crop in the month of April having a consumptive use coefficient equal to 0.and pan evaporation iscm?
  • a) 28 cm
  • b) 43.75 cm
  • c) 35.80 cm
  • d) 40.80 cm
Q.8
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.mm of Hg/°C and the net incoming solar radiation is 5.mm of evaporative water/day. Assume, Ea = 18.mm/day and Psychrometric constant = 0.mm of Hg/°C.
  • a) 17.01 mm/day
  • b) 18 mm/day
  • c) 11.07 mm/day
  • d) 20.45 mm/day
Q.9
What is the correct expression of parameter Ea in Penman’s equation?
  • a) Ea = 0.35 (1 + V2/160) (es – ea)
  • b) Ea = 0.35 (1 + V2/160) (es + ea)
  • c) Ea = 0.35 (1 – V2/160) (es – ea)
  • d) Ea = 0.35 (1 – V2/160) (es + ea)
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