6291. Foot valves provided in pumps are __________ valves.
Relief
Three/four way
Pressure reducing
Directional control
✅ The correct answer is option D.
Chemical Engineering
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6292. The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.
Inlet tip of a blade curves in a direction opposite to that
Outlet tip of a blade curves in a direction opposite to that
Inlet tip of a blade is towards the direction
Outlet tip of a blade is towards the direction
✅ The correct answer is option D.
6293. Normal depth in open channel flow is the depth of flow in the channel
Corresponding to uniform flow
Measured normal to the channel bed
Corresponding to steady flow
None of these
✅ The correct answer is option A.
6294. While starting an axial flow pump, its delivery valve should be kept
Open
Closed
Either open or closed
None of these
✅ The correct answer is option A.
6295. A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.
Sump
Volute
Vacuum
Submerged
✅ The correct answer is option C.
6296. The schedule number of a pipe is an indication of its
Size
Roughness
Material density
Wall thickness
✅ The correct answer is option D.
6297. Buoyant force
For non-symmetrical bodies is not vertical
Depends on the depth of the submergence of the floating body
Depends on the weight of the floating body
None of these
✅ The correct answer is option C.
6298. The kinetic energy correction factor for velocity distribution of laminar flow is
0.5
1.66
1
2
✅ The correct answer is option B.
6299. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.
NPSH required
BHP required by the pump
Head of the liquid pumped
All of the above
✅ The correct answer is option D.
6300. The capillary rise of mercury is maximum in glass tube of dia __________ mm.
0.5
1
2
5
✅ The correct answer is option A.