WorksheetsDay 33_Diploma_ orifice, mouthpiece
Total questions: 15
Worksheet time: 14mins
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
Ratio of area of jet to area of orifice
Coefficient of contraction
Ratio of actual velocity to theoretical velocity
Coeff. of velocity
Coeff. of contraction * coeff of velocity
Coeff. of discharge
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)
Water at 20∘C flows with velocity 0.4 m/s through a 50 mm pipe.
Find the Reynolds number. What type of flow is it?
(ν=1.0×10−6 m2/s)
(a)
Assertion (A): In laminar flow, head loss varies directly with velocity.
Reason (R): Shear stress in laminar flow is proportional to velocity gradient.
(a)
Assertion (A): In turbulent flow, the friction factor decreases with increase in Reynolds number for smooth pipes.
Reason (R): At higher Reynolds numbers, viscous effects are less significant.
(a)
Assertion (A): The Chezy’s equation can be derived from the Darcy–Weisbach equation.
Reason (R): Both express velocity as a function of slope and hydraulic radius with different empirical constants.
(a)
A tank has a sharp-edged orifice of area a=0.002 m2 at the bottom.
Head over the orifice drops from 2.25 m to 1.25 m in 40 s.
Find the coefficient of discharge Cd
(a)
