Bissoy.com
Doctors Medicines MCQs Q&A

When pressure drag over a body is large as compared to the friction drag, then the shape of the body is that of

When pressure drag over a body is large as compared to the friction drag, then the shape of the body is that of Correct Answer a bluff body

Explanation:

Bluff body:

A bluff body is one in which the length in the flow direction is close to or equal to the length perpendicular to the flow direction.​

Bodies subjected to fluid flow are classified as being streamlined and blunt/bluff, depending on their overall shape.

A bluff body is defined as that body whose surface does not coincide with the streamlines when placed in a flow. Then the flow is separated from the surface of the body much ahead of its trailing edge with the result of a very large wake formation. Then the drag due to pressure will be very large as compared to the drag due to friction on the body.

[ alt="897" src="//storage.googleapis.com/tb-img/production/18/03/897.PNG" style="height: 164px; width: 354px;">

On the other hand when the friction drag is higher than the pressure drag then the body is known as a streamlined body.

Related Questions

Which of the following is NOT true about Frictional force? A. Friction is the force which opposes the relative motion of two surfaces in contact. B. The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction. C. Friction in machines wastes energy and also causes wear and tear. D. Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction.
The total drag is a sum of the skin drag and the pressure drag. Which among of the following options, states the correct formula for skin drag and pressure drag? (Here µ stands for dynamic viscosity of fluid, D stands for diameter of the sphere and U stands for velocity of flow of fluid.)
Bluff body is the body of such a shape that pressure drag as compared to friction drag is
Which two classes use the Shape class correctly?
A. public class Circle implements Shape { private int radius; }B. public abstract class Circle extends Shape { private int radius; }C. public class Circle extends Shape { private int radius; public void draw(); }D. public abstract class Circle implements Shape { private int radius; public void draw(); }E. public class Circle extends Shape { private int radius; public void draw() { /* code here */ } }F. public abstract class Circle implements Shape { private int radius; public void draw() { /* code here */ } }
While discussing about friction, a teacher gave a number of examples to explain the concept. Some of the examples where friction is useful in our day-to-day life as quoted by the teacher are given below : A. We are able to write because of friction between the tip of the pen and the paper. B. We are able to walk because of friction between our feet and the ground. C. A ball thrown vertically upwards comes back to us due to friction. D. We are able to stop a moving vehicle by applying brakes because of friction. The correct examples were
Consider the following statements: 1. The kinetic friction is always less than the rolling friction. 2. The kinetic friction is always equal to the rolling friction. 3. The kinetic friction is always greater than the rolling friction. Which of the following statement is correct?
In which of the following body shapes, the pressure drag is large compared to the friction drag?
Surface friction drag corresponds to 35% of the lift independent drag whereas the profile drag leads to 65% of the lift independent drag.
Which of the following gives a better approximate distribution of drag over thin airfoils? The given percentages are for skin- friction drag and pressure drag respectively.
3/4th of square were taken to form shape A and the rest was made to form shape B. Shape A was divided into four equal squares (Shape C), what will be the ratio of the one shape C to one shape B.