Mechanical Engineering Mcqs

Steady flow occurs when___________________?

(A) the direction and magnitude of the velocity at all points are identical

(B) the velocity of successive fluid particles, at any point, is the same at successive periods of time

(C) the magnitude and direction of the velocity do not change from point to point in the fluid

(D) the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

(D) velocity, depth, pressure, etc. change from point to point in the fluid flow

Submitted By: Ali Uppal


Bernoulli equation deals with the law of conservation of__________________?

(A) mass

(B) momentum

(C) energy

(D) work

(D) force

Submitted By: Ali Uppal


For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________?

(A) ratio of inertial force to force due to viscosity

(B) ratio of inertial force to force due to gravitation

(C) ratio of inertial force to force due to surface tension

(D) all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity

Submitted By: Ali Uppal


Cavitation will begin when__________________?

(A) the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

(B) pressure becomes more than critical pressure

(C) flow is increased

(D) pressure is increased

(D) none of the above

Submitted By: Ali Uppal


Submitted By: Ali Uppal


Principle of similitude forms the basis of_________________?

(A) comparing two identical equipments

(B) designing models so that the result can be converted to prototypes

(C) comparing similarity between design and actual equipment

(D) hydraulic designs

(D) performing acceptance tests

Submitted By: Ali Uppal


Cavitation is caused by_____________________?

(A) high velocity

(B) high pressure

(C) weak material

(D) low pressure

(D) low viscosity

Submitted By: Ali Uppal


For pipes, turbulent flow occurs when Reynolds number is _____________________?

(A) less than 2000

(B) between 2000 and 4000

(C) more than 4000

(D) less than 4000

(D) none of the above

Submitted By: Ali Uppal


In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than_______________?

(A) frictional force

(B) viscosity

(C) surface friction

(D) all of the above

(D) none of the above

Submitted By: Ali Uppal


A large Roynold number is indication of________________?

(A) smooth and streamline flow

(B) laminar flow

(C) steady flow

(D) turbulent flow

(D) highly turbulent flow

Submitted By: Ali Uppal