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Browse complete papersThe classification of hydraulic turbines according to the type of energy at the inlet of the turbine includes _______.
mixed-flow turbines
medium-head turbines
reaction turbines
tangential-flow turbines
Correct answer
mixed-flow turbines
The formula for the maximum efficiency (\( \eta_{max} \)) of a Pelton wheel turbine is _______, where Ø is vane angle at the outlet.
\( \eta_{max} = \frac{\sin \emptyset}{2} \)
\( \eta_{max} = \frac{1 + \sin \emptyset}{2} \)
\( \eta_{max} = \frac{1 + \cos \emptyset}{2} \)
\( \eta_{max} = \frac{\cos \emptyset}{2} \)
Correct answer
\( \eta_{max} = \frac{\sin \emptyset}{2} \)
Which of the following factors influence the magnitude of hydrostatic pressure on the unit length of a dam?
Shape of the dam face towards the downstream side
Overall length of the dam
Shape of the dam face towards the upstream side
Density of the material used in the dam
Correct answer
Shape of the dam face towards the downstream side
Which of the following compositions of compounds bears the maximum portion of Bogue’s compounds present in ordinary Portland cement?
\( C_{3}S \) (Tricalcium silicate) and \( C_{3}A \) (Tricalcium aluminate)
\( C_{3}A \) (Tricalcium aluminate) and \( C_{4}AF \) (Tetracalcium aluminoferrite)
\( C_{3}A \) (Tricalcium aluminate) and \( C_{2}S \) (Dicalcium silicate)
\( C_{3}S \) (Tricalcium silicate) and \( C_{2}S \) (Dicalcium silicate)
Correct answer
\( C_{3}S \) (Tricalcium silicate) and \( C_{3}A \) (Tricalcium aluminate)
The duty of water is 1420 ha/cumec for a crop whose base period is 60 days. Calculate the delta for the given details.
0.611 m
0.542 m
0.423 m
0.365 m
Correct answer
0.611 m
_______ are the devices which are used for measuring the pressure by balancing the fluid column by a spring or dead weight.
Differential manometers
Piezometers
Mechanical gauges
Simple manometers
Correct answer
Differential manometers
To avoid the segregation in concrete, it should not be dropped from a height of more than _______ while placing.
1.5 m
1 m
2.5 m
2 m
Correct answer
1.5 m
Identify the INCORRECT statement about shotcrete.
Shotcrete is the name given to mortar or concrete conveyed through a hose and pneumatically projected at a low velocity onto a backup surface.
Shotcrete is used in stabilising rock slopes.
Shotcrete is used for thin, lightly reinforced sections.
Shotcrete is more formally called pneumatically applied mortar or concrete.
Correct answer
Shotcrete is the name given to mortar or concrete conveyed through a hose and pneumatically projected at a low velocity onto a backup surface.
Lining of an irrigation canal is required to _______.
retard the growth of weeds
minimise the seepage losses in the canal
reduce maintenance of the canal
decrease the discharge in the canal section by decreasing the velocity of flow
Correct answer
retard the growth of weeds
The specific yield value of an aquifer is always _______, as some water is retained in the aquifer by molecular and surface tension forces.
greater than its porosity
less than its porosity
the inverse of its porosity
equal to its porosity
Correct answer
greater than its porosity