While deriving an expression for loss of head due to a sudden expansion in a pip

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Question
While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made :
Options
A. Head loss due to friction is equal to the head loss in eddying motion
B. The mean pressure in eddying fluid is equal to the downstream pressure
C. The mean pressure in eddying fluid is equal to the upstream pressure
D. Head lost in eddies is neglected

Correct Answer

The mean pressure in eddying fluid is equal to the upstream pressure

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1. Biochemical oxygen demand (BOD) of waste water is a measure of
Options
A. total concentration of a biochemicals
B. total concentration of organic matter
C. concentration of biodegradable organic matter
D. concentration of chemically oxidisable matter

2. A stable channel is to be designed for a discharge of Q m³ /s with silt factor f as per Lacey's method. The mean flow velocity (m/s) in the channel is obtained by
Options
A. (Qf²/140)^1/6
B. (Qf/140)^1/3
C. (Q²f²/140)^1/6
D. 0.48 (Q/f)^1/3

4. A pre-tensioned concrete member of section 200 mm x 250 mm contains tendons of area 500 mm² at centre of gravity of the section. The prestress in the tendons is 1000 N/mm². Assuming modular ratio as 10, the stress (N/mm²) in concrete is
Options
A. 11
B. 9
C. 7
D. 5

6. A light house of 120 m height is just visible above the horizon from a ship. The correct distance (m) between the ship and the light house considering combined correction for curvature and refraction, is
Options
A. 39.098
B. 42.226
C. 39098
D. 42226

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