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271.

Laminar flow

takes

does not take

272.

Turbulent flow takes place at high velocities.

Agree

Disagree

273.

The velocity at which the flow changes from laminar flow to turbulent flow is called

A.	critical velocity	B.	velocity of approach
C.	sub-sonic velocity	D.	super-sonic velocity

274.

Which of the following is an example of maninar flow?

A.	Under ground flow	B.	Flow past tiny bodies
C.	Flow of oil in measuring insturments	D.	all of these

275.

The velocity at which the laminar flow stops, is known as

A.	velocity of approach	B.	lower critical velocity
C.	higher critical velocity	D.	none of these

276.

The velocity at which the turbulent flow starts is known as higher critical velocity.

Yes

277.

Reyold's number is the ratio of the inertia force to the

A.	surface tension force	B.	viscous force
C.	gravity force	D.	elastic force

278.

The flow in a pipe is laminar, when Reynold number is less than 2000.

True

False

279.

The flow in a pipe is turbulent when Reynold number is

A.	less than 2000	B.	between 2000 and 2800
C.	more than 2800	D.	none of these

280.

The vlow in a pipe is neither laminar nor turbulent when Reynold number is

A.	less than 2000	B.	between 2000 and 2800
C.	more than 2800	D.	none of these