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NTPC (Technical Ability)
Turbomachinery
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Turbomachinery
question_answer
A vertical sluice gate, 2.5 m wide and weighing 500 kg is held in position due to horizontal force of water on one side and associated friction force. When the water level drops down to 2 m above the bottom of the gate, the gate just starts sliding down. The coefficient of friction between the gate and the supporting structure is:
A)0.20
B)0.10
C)0.05
D)0.02
Correct Answer:
B
Solution :
Area of gate at sliding, Force, on upstream of gate, Frictional force,