Chemical Engineering Archives

5961. In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is

The velocity of sound

Dependent on its cross-sectional area

Dependent on fluid viscosity

Dependent on fluid density

✅ The correct answer is option A.

5962. Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will

Increase

Decrease

Remain same

Data insufficient to predict pressure drop

✅ The correct answer is option A.

5963. Drag is the force component exerted on an immersed object,

Passing the centroid of the body at 60°to the direction of motion

The component being parallel to theflow direction

The component being normal to the flow direction

None of these

✅ The correct answer is option B.

5964. Volute of a centrifugal pump should be designed in a fashion, such that the

Kinetic head gets converted into static head

Moving stream gradually reduces velocity

Mean velocity remains constant

None of these

✅ The correct answer is option A.

5965. Manometers measure the __________ pressure.

Vacuum as well as the atmospheric

Difference in

Absolute

Gage

✅ The correct answer is option B.

5966. Pick out the wrong statement about cavitation.

Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation

Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities

Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise

Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades

✅ The correct answer is option D.

5967. Which of the following factors does not contribute to the pressure drop in a pipeline ?

Velocity of fluid

Size of pipe

Length of pipe and number of bends

None of these

✅ The correct answer is option D.

5968. One horsepower is equal to

550 lbf.ft/second

550 kgf.m/second

Both A and B

550 lbf.ft./hr

✅ The correct answer is option A.

5969. Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)

√d

d1/3

d2/3

✅ The correct answer is option A.

5970. Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter

Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter

Venturimeter occupies less space than an orificemeter

Venturimeter incurs less power loss compared to an equivalent orificemeter

✅ The correct answer is option C.