Fluid Mechanics mcqs

<12

> 12.5

< 10

4

F1 < F2

F1 > F2

Data Not Sufficient To Relate F1 & F2

F1 = F2

Head Of The Liquid Pumped

All A., And C.

Bhp Required By The Pump

Npsh Required

0

0.5

∞

1

Not Related To

More Than

Equal To

Less Than

0.42

0.62

0.98

0.82

Any Liquid

None Of These

Water

Solids

4.33 Psi, 10 Ft. Of Water, 20.7 Inches Of Hg

4.33 Psi, 10 Ft. Of Water, 8.83 Inches Of Hg

10 Psi, 19.7 Ft. Of Water, 5.3 Inches Of Hg

10 Psi, 19.7 Ft. Of Water, 23.3 Inches Of Hg

Flt, Ml-1t-1

Fl-2t, Ml-1t-1

Ml-1t-3, F-1l2t

F-1l2t-1, Mlt-3

Specified Mass Flow Rate Cannot Be Achieved

Restriction In Flow Cross-Section Area Occurs

None Of These

Valve Is Closed In The Line

For Controlling Water Flow

At High Pressure

For Unidirectional Flow

In Bends

Discharge Pressure

Flow Of Liquid During Operation Of The Pump

Back Flow Of Fluid In The Event Of Stoppage Of Pump

All A., And C.

Very Precise Control Of

Unidirectional

None Of These

Multidirectional

Generally A Globe Valve

All A., And C.

Provided To Prevent Liquid From Backing Up Through The Pump When The Pump Is Turned Off Or

Provided In The Discharge Line

B.H.P., Efficiency And Head

Efficiency, B.H.P. And Head

Efficiency, Head And B.H.P.

Head, Efficiency And B.H.P.

Run At A Lower Speed For The Same Discharge

Can Be Run With Discharge Line Valve Closed For A Short Interval

Do Not Need Priming

Deliver Fluid With Pulsating/Fluctuating Discharge

Type Of Casing

Number Of Blades In Impeller

Rpm

Impeller Blade Angle

Molten Sodium (Used As A Coolant In Fast Breeder Reactor)

Thick Molten Soap At 80°C

Moderately Viscous Vegetable Oil Used In Soap Industry

None Of The Above

Have Lower Operating Costs

Require Less Space

Have Quieter Operation

All A., And C.

Is At The Centroid Of The Plane Surface

Is Independent Of The Specific Weight Of The Fluid

Is Different For Different Fluids

Lies Above The Centroid Of The Plane Surface

Above

At

Below

Either Above Or Below; Depends On The Liquid Density

Either More Or Less Than

Less Than

Equal To

Greater Than

0.58 To 0.8

0.02 To 0.03

0.2 To 0.3

0.93 To 0.98

Less Than The Vapour Pressure Of The Liquid At That Temperature

Equal To The Developed Head

Equal To The Vapour Pressure

Greater Than The Vapour Pressure Of The Liquid At That Temperature

Decrease In Effect

Develops High Pressure

Develops Noise

Increase In Thrust