railway RRB JE (CBT I + CBT II) Mock Test 2024 Fluid Mechanics Dimensional and Model Analysis

A turbine works at 20 m head and 500 rpm speed. Its 1 ∶ 2 scale model to be tested at a head of 20 m should have a rotational speed of nearly 

1
250 rpm
2
1000 rpm
3
500 rpm
4
700 rpm
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