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WorksheetsDAY 41 WORKSHEET LSGD (Hydroelectric and Irrigation)
Total questions: 15
Worksheet time: 10mins
When the gross head of a hydroelectric project is 80 m and total head loss due to friction and turbulence is 5 m, the net head available at the turbine equals —
75 m
80 m
85 m
70 m
If the penstock length increases while diameter remains constant, the water-hammer pressure will —
Increase linearly
Decrease
Remain same
First increase then drop
In a reservoir, water stored below the invert level of the lowest outlet cannot be used for power generation. This portion is called —
Live storage
Dead storage
Surcharge storage
Valley storage
When a canal and a natural drain meet approximately at the same level, the suitable cross-drainage work adopted is —
Super passage
Aqueduct
Level crossing
Siphon aqueduct
The type of turbine used where the head is more than 250 m and discharge is comparatively low is —
Francis turbine
Pelton wheel
Kaplan turbine
Propeller turbine
A gravity dam resists the water pressure mainly by its self-weight.
True
False
A forebay tank in a hydroelectric plant is mainly provided to store surplus energy of the generator during low load.
True
False
Assertion (A): A surge tank is provided between penstock and turbine. Reason (R): It absorbs sudden excess pressure caused by rapid valve closure.
Both A and R true; R is correct explanation of A
Both A and R true; R not correct explanation
A true but R false
Both A and R false
The irrigation method adopted when the water level of the source is lower than the command area is called (a) .
The time interval between the first watering before sowing and last watering before harvest is known as (a) .
In a hydro-electric project, the difference between headrace level and tailrace level is termed (a) .
The property of soil that allows it to transmit water through its pores is called (a) .
The crops that cannot normally be grown without irrigation water are called (a) crops.
MATCH THE FOLLOWING: SET 1 – Hydropower Components
A. Forebay
Acts as regulating reservoir before pens
B. Penstock
Carries water under pressure to turbine
C. Surge tank
Balances water-hammer pressure
D. Draft tube
Connects tailrace to turbine outlet
MATCH THE FOLLOWING: SET 2 – Irrigation & Reservoir Concepts
A. Delta
Depth of water required to mature a cro
B. Duty
Area irrigated per unit volume of water
C. Freeboard
Vertical distance between top of dam an
D. Dead storage
Water below minimum drawdown level
