500 Best Hydraulics MCQ
Q49). Flow in pipes is laminar if Reynold number is
a).less than 2100
b).more than 3000
c).between 2100 and 3000
d).none of these.
Correct Answer:
less than 2100
Explanation:
Q50). In flow, the liquid particles may possess
a).potential energy
b).kinetic energy
c).pressure energy
d).all the above.
Correct Answer:
all the above.
Explanation:
Q51). Euler’s equation for the motion of liquids assumes that
a).fluid is viscous
b).fluid is homogeneous and incompressible
c).velocity of flow is non-uniform over the section
d).flow is unsteady along the stream line.
Correct Answer:
fluid is homogeneous and incompressible
Explanation:
Q52). The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter is 50 m. The velocity of water flowing through the hole, is
a).31.1 m/sec
b).31.2 m/sec
c).31.3 m/sec
d).31.4 m/sec.
Correct Answer:
31.3 m/sec
Explanation:
Q53). A steady uniform flow is through
a).a long pipe at decreasing rate
b).a long pipe at constant rate
c).an expanding tube at constant rate
d).an expanding tube at increasing rate
Correct Answer:
a long pipe at constant rate
Explanation:
Q54). Cavitation is caused by
a).Low pressure
b).High pressure
c).Low velocity
d).High velocity
Correct Answer:
Low pressure
Explanation:
Q55). Mach number is the ratio of inertia force to
a).viscosity
b).surface tension
c).gravitational force
d).elasticity.
Correct Answer:
elasticity.
Explanation:
Q56). The main assumption of Bernoulli’s equation is :
a).The velocity of energy of liquid particle, across any cross-section of a pipe is uniform
b).No external force except the gravity acts on the liquid
c).There is no loss of energy of the liquid while flowing
d).All the above.
Correct Answer:
All the above.
Explanation: