Fluid Mechanics for Chemical MCQs

724 MCQs  — Chemical Engineering MCQs  (Page 59 of 73)

While starting a centrifugal pump, its delivery valve should be kept___________________?
A. Opened
B. Closed
C. Either opened or closed; it does not make any difference
D. Either opened or closed; depending on the fluid viscosity
Buoyant force__________________?
A. For non-symmetrical bodies is not vertical
B. Depends on the depth of the submergence of the floating body
C. Depends on the weight of the floating body
D. None of these
Boundary layer separation occurs when the____________________?
A. Pressure reaches a minimum
B. Cross-section of the channel is reduced
C. Valve is closed in a pipeline
D. Velocity of sound is reached
Boiler feed water pump is usually a ______________ pump?
A. Reciprocating
B. Gear
C. Multistage centrifugal
D. Diaphragm
Interstage coolers are provided in a multistage compressor to____________________?
A. Save power in compressing a given volume to a given pressure
B. Cool the delivered air
C. Achieve the exact delivery pressure
D. None of these
When a fluid flows over a solid surface, the___________________?
A. Velocity is uniform at any cross-section
B. Velocity gradient is zero at the solid surface
C. Resistance between the surface & the fluid is lesser as compared to that between the fluid
LayErs themselves