GATE ME 2017 Set 1 | Laminar Flow Question 1 | Fluid Mechanics

GATE ME 2017 Set 1

MCQ (Single Correct Answer)

-0.3

For steady flow of a viscous incompressible fluid through a circular pipe of constant diameter, the average velocity in the fully developed region is constant. Which one of the following statements about the average velocity in the developing region is TRUE?

It increases until the flow is fully developed.

It is constant and is equal to the average velocity in the fully developed region.

It decreases until the flow is fully developed.

It is constant but always lower than the average velocity in the fully developed region.

GATE ME 2017 Set 2

MCQ (Single Correct Answer)

-0.3

Consider a laminar flow at zero over a flat plate . The shear stress at the wall is denoted by $${\tau _w}.$$ The axial positions $${x_1}$$ and $${x_2}$$ on the plate are measured from the leading edge in the direction of flow. If $${x_2} > {x_1},$$ then

$${\tau _w}\left| {_{{x_1}} = {\tau _w}} \right|{}_{{x_2}} = 0$$

$${\tau _w}\left| {_{{x_1}} = {\tau _w}} \right|{}_{{x_2}} \ne 0$$

$${\tau _w}\left| {_{{x_1}} > {\tau _w}} \right|{}_{{x_2}}$$

$${\tau _w}\left| {_{{x_1}} < {\tau _w}} \right|{}_{{x_2}}$$

GATE ME 2015 Set 1

MCQ (Single Correct Answer)

-0.3

Consider fully developed flow in a circular pipe with negligible entrance length effects. Assuming the mass flow rate, density and friction factor to be constant, if the length of the pipe is doubled and the diameter is halved, the head loss due to friction will increase by a factor of

$$4$$

$$16$$

$$32$$

$$64$$

GATE ME 2015 Set 3

MCQ (Single Correct Answer)

-0.3

Couette flow is characterized by

Steady, incompressible, laminar flow through a straight circular pipe

Fully developed turbulent flow through a straight circular pipe

Steady, incompressible, laminar flow between two fixed parallel plates

Steady, incompressible, laminar flow between one fixed plate and the other moving with a constant velocity