Question

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I	List-II
A. Flow development	1. Surge tank
B. Pipe network	2. Entrance length
C. Water hammer	3. Darcy-Weisbach equation
D. Friction loss	4. Hardy-Cross method

• A. $A-2,B-4,C-1,D-3$
• B. $A-4,B-2,C-3,D-1$
• C. $A-2,B-4,C-3,D-1$
• D. $A-4,B-2,C-1,D-3$

Answer 1

The correct option is A $A-2,B-4,C-1,D-3$

Surge tanks are used to absorb the increase in pressure due to water hammer phenomenon.
$\text{Entrance length in a pipe is the length where boundary layer increases and the flow is established or developed fully.}$ $Entrancelength\left(L_e\right)$
$\frac{L_e}{D}=0.07Re\left(0.06Re\right)\text{For laminar flow given by}Rouse$
$\frac{L_e}{D}=50\text{For turbulent flow}$
where D is the diameter of the pipe.

Entrance length for turbulent flow is much smaller than laminar flow.