500 Best Hydraulics MCQ
Q65). For most economical rectangular section of a channel, the depth is kept
a).one-fourth of the width
b).three times the hydraulic radius
c).half the width
d).hydraulic mean depth
Correct Answer:
half the width
Explanation:
Q66). In a centrifugual pump casing, the flow of water leaving the impeller, is
a).rectilinear flow
b).radial flow
c).free vortex motion
d).forced vertex.
Correct Answer:
free vortex motion
Explanation:
Q67). In fluids, steady flow occurs when
a).conditions of flow change steadily with time
b).conditions of flow do not change with time at a point
c).conditions of flow remain the same at adjacent point
d).velocity vector remains constant at a point.
Correct Answer:
conditions of flow do not change with time at a point
Explanation:
Q68). From a nozzle exposed to atmosphere, the liquid jet traverses
a).a straight line
b).a circular path
c).an elliptical path
d).a parabolic path.
Correct Answer:
a parabolic path.
Explanation:
Q69). To avoid the force of surface tension in an inclined manometer, the minimum angle of inclination is
a).2°
b).3°
c).4°
d).5°
Correct Answer:
4°
Explanation:
Q70). A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m3) when rotated about its vertical axis at 100 r.p.m. The total pressure on its lid, is
a).459 kg
b).549 kg
c).945 kg
d).954 kg
Correct Answer:
954 kg
Explanation:
Q71). For exerting a pressure of 4.8 kg/cm^2, the depth of oil (specific gravity 0.8), should be
a).40 cm
b).41 cm
c).56 cm
d).60 cm
Correct Answer:
60 cm
Explanation:
Q72). A cylindrical vessel 40 cm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5^(1/2) cm, the angular velocity of rotation, is
a).2 rad/sec
b).3 rad/sec
c).4 rad/sec
d).5 rad/sec
Correct Answer:
2 rad/sec
Explanation: