**A. f1/4**

B. 4f2

C. 2f1

D. f1/2

# Fluid Mechanics for Chemical

## Which of the following may be termed as a variable orifice flow-meter ?

**A. Rotameter**

B. Pitot tube

C. V-notch

D. All A., B. and C.

## A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?

**A. 17**

B. 42

C. 84

D. 1.8

## The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?

**A. Barometric pressure**

B. Speed of the impeller

C. Diameter of the impeller

D. Both B. and C.

## The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the _____________ equation?

**A. Nikuradse**

B. Von-Karman

C. Blasius

D. Colebrook

## The ratio of inertial forces to gravity forces is called the ______________ number?

A. Mach

**B. Froude**

C. Euler

D. Weber

## A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to_________________?

**A. Lρv2/D**

B. LμV/D2

C. Dρv2/L

D. μV/L

## A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) ?

A. 0.01

**B. 0.1**

C. 1

D. 10

## The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is__________________?

**A. < 1**

B. 1

C. > 1

D. 2

## In case of end to end connection of two or more pipes in series, the ______________ each pipe?

**A. Same rate of flow passes through**

B. Head loss is same through

C. Rate of flow in each pipe is proportional to the length of

D. Total flow rate is the sum of flow rate in