8 m3/s निर्वहन 4 m चौड़े आयताकार चैनल से 2 m/s के वेग से बहता है। चैनल की द्रव-चालित माध्य त्रिज्या ___ है

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UKPSC JE Civil 2013 Official Paper II
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  1. 3/2 m
  2. 2/3 m
  3. 1 m
  4. 4 m

Answer (Detailed Solution Below)

Option 2 : 2/3 m
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संकल्पना:

चैनल का नम क्षेत्र,

A = \(\frac{Q}{V}\)

इसलिए, नम परिधि,

P = (B + 2d)

चैनल की द्रवीय माध्य गहराई निम्नवत है

\(R = \frac{{\left( {Wetted\;Area,\;A} \right)}}{{\left( {Wetted\;Perimeter,\;P} \right)}}\)

गणना:

दिया गया है,

Q = 8 m3/s

B = 4 m

V = 2 m/s

चैनल का नम क्षेत्र,

A = \(\frac{Q}{V}\)

\(A = \frac{8}{2} = 4\;{m^2}\)

A = B × d

⇒ B × d = 4 m2

⇒ 4 × d = 4

 d = 1 m

इसलिए, नम परिधि,

P = (B + 2d)

P = (4 + (2 × 1)) = 6 m

चैनल की द्रव-चालित माध्य गहराई निम्न है

\(R = \frac{{\left( {Wetted\;Area,\;A} \right)}}{{\left( {Wetted\;Perimeter,\;P} \right)}}\)

\(R = \frac{4}{6} = \frac{2}{3} \;m\)
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