Fluid Mechanics mcqs

> 12.5

< 10

4

<12

Data Not Sufficient To Relate F1 & F2

F1 = F2

F1 < F2

F1 > F2

Head Of The Liquid Pumped

All A., And C.

Bhp Required By The Pump

Npsh Required

0.5

0

∞

1

More Than

Less Than

Equal To

Not Related To

0.98

0.82

0.42

0.62

Water

Any Liquid

None Of These

Solids

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

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

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

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

F-1l2t-1, Mlt-3

Ml-1t-3, F-1l2t

Flt, Ml-1t-1

Fl-2t, Ml-1t-1

Specified Mass Flow Rate Cannot Be Achieved

Restriction In Flow Cross-Section Area Occurs

Valve Is Closed In The Line

None Of These

For Controlling Water Flow

In Bends

For Unidirectional Flow

At High Pressure

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.

Unidirectional

None Of These

Very Precise Control Of

Multidirectional

Generally A Globe Valve

Provided In The Discharge Line

All A., And C.

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

B.H.P., Efficiency And Head

Efficiency, B.H.P. And Head

Head, Efficiency And B.H.P.

Efficiency, Head And B.H.P.

Run At A Lower Speed For The Same Discharge

Do Not Need Priming

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

Deliver Fluid With Pulsating/Fluctuating Discharge

Type Of Casing

Rpm

Impeller Blade Angle

Number Of Blades In Impeller

Thick Molten Soap At 80°C

Moderately Viscous Vegetable Oil Used In Soap Industry

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

None Of The Above

Require Less Space

All A., And C.

Have Quieter Operation

Have Lower Operating Costs

Lies Above The Centroid Of The Plane Surface

Is Independent Of The Specific Weight Of The Fluid

Is At The Centroid Of The Plane Surface

Is Different For Different Fluids

Below

Above

At

Either Above Or Below; Depends On The Liquid Density

Either More Or Less Than

Less Than

Greater Than

Equal To

0.2 To 0.3

0.02 To 0.03

0.58 To 0.8

0.93 To 0.98

Equal To The Vapour Pressure

Less Than The Vapour Pressure Of The Liquid At That Temperature

Greater Than The Vapour Pressure Of The Liquid At That Temperature

Equal To The Developed Head

Increase In Thrust

Develops Noise

Develops High Pressure

Decrease In Effect