Day 33_Diploma_ orifice, mouthpiece

The mouthpiece gives higher discharge than orifice of same diameter because of

• (a) Lesser contraction
  

• (b) Greater head loss
  

• (c) More turbulence
  

• (d) Smaller coefficient of discharge

The Chezy’s constant CCC depends on

• (a) Only roughness
  

• (b) Only slope
  

• (c) Both roughness and hydraulic radius
  

• (d) Only hydraulic radius

For a fully developed turbulent flow in smooth pipes, friction factor f varies approximately as

• (a) Re^-1
  

• (b) Re−^1/4
  

• (c) Re−^1/2
  

• (d) Re−^1/3

A sharp-edged orifice of diameter 40 mm discharges water under a head of 2.5 m.
If Cd=0.62, find the discharge.

(a)  

Water flows through a 200 mm diameter, 500 m long pipe with velocity 3 m/s.
Find head loss due to friction if f=0.02

(a)  

A rectangular channel has hydraulic radius R=1.5 m, slope S=0.0008 and Chezy’s constant C=55
Find velocity of flow.

(a)  

Match

• Coeff. of velocity

• Ratio of area of jet to area of orifice

• Coeff. of discharge

• Ratio of actual velocity to theoretical velocity

• Coefficient of contraction

• Coeff. of contraction * coeff of velocity

Assertion (A): The coefficient of velocity for a mouthpiece is nearly unity.
Reason (R): The flow through a mouthpiece is more streamlined with reduced energy losses.


(a)  

A 50-mm diameter sharp-edged orifice discharges water under a head of 2.5 m.
If Cd=0.61, find Q

(a)  

Find head loss in a 250 mm diameter, 400 m long pipe carrying water at 2.5 m/s.
Take f=0.022

(a)