500 Best Hydraulics MCQ
Q137). Centre of buoyancy is
a).centroid of the floating body
b).centroid of the fluid displaced
c).centre of pressure of the displaced liquid
d).none of these.
Correct Answer:
centroid of the fluid displaced
Explanation:
Q138). The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity , is directly proportional to :
a).square root of the bulk modulus of elasticity of water
b).bulk modulus of elasticity of water
c).specific weight of water
d).none of these.
Correct Answer:
square root of the bulk modulus of elasticity of water
Explanation:
Q139). Total energy line is
a).pressure head
b).datum head
c).kinetic head
d).All the above.
Correct Answer:
All the above.
Explanation:
Q140). For critical flow, the Froude number is :
a).1
b).less than 1.0
c).more than 1.0
d).2
Correct Answer:
1
Explanation:
Q141). A stepped notch is a combination of
a).rectangular notches of different sizes
b).triangular notches of different sizes
c).rectangular and triangular notches
d).all of the above.
Correct Answer:
rectangular notches of different sizes
Explanation:
Q142). The centre of pressure of a vertical plane immersed in a liquid is at
a).centre of higher edge
b).centre of lower edge
c).centroid of the area
d).none of these.
Correct Answer:
none of these.
Explanation:
Q143). The ratio of the hydraulic radius of a pipe running full to the hydraulic radius of a square section of a channel whose side is equal to the diameter of the pipe, is
a).1
b). 1/2
c). 1/3
d). 3/4
Correct Answer:
3/4
Explanation:
Q144). A body of dimensions 1.5 m x 1.0 m x 2 m weighs 3000 kg in water. Its specific gravity is
a).0.8
b).0.9
c).1
d).1.1
Correct Answer:
1.1
Explanation: