Chemical Engineering - Fluid Mechanics

11. 

In case of a __________ the energy of flow is considerably decreased downstream of the machine.

A. blower
B. turbine
C. centrifugal pump
D. centrifugal fan

Answer: Option B

Explanation:

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12. 

With increase in the shear rate, the apparent viscosity of pseudoplastic fluids

A. increases
B. decreases
C. remains same
D. may increase or decrease; depends on the magnitude of shear rate

Answer: Option B

Explanation:

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13. 

Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about

A. 0.42
B. 0.62
C. 0.82
D. 0.98

Answer: Option B

Explanation:

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14. 

Purpose of hydraulic accumulator is to

A. ensure intermittant supply of hydraulic pressure.
B. increase the pressure and store/ accumulate it.
C. accumulate pressure to increase force.
D. generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

Answer: Option D

Explanation:

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15. 

Pick out the wrong statement.

A. Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces.
B. A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces.
C. In case of unsteady fluid flow, the velocity at any given point does not change with time.
D. Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point.

Answer: Option C

Explanation:

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