Top 250+ Solved Fluid Mechanics and Machinery MCQ Questions Answer
Q. The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?
a. the flow will become turbulent
b. the flow will be a transition flow
c. the flow will remain laminar
d. the reynolds number of the earlier flow is required to answer this question
Q. Which of the following flows have the highest critical Reynolds number (lower)?
a. flow in a pipe
b. flow between parallel plates
c. flow in an open channel
d. flow around spherical body
Q. The flow separation occurs when the fluid travels away from the
a. surface
b. fluid body
c. adverse pressure gradient
d. inter-molecular spaces
Q. Which among the following is a device that converts a laminar flow into a turbulent flow?
a. dead weight gauge
b. vacuum gauge
c. turbulator
d. ionization gauge
Q. Which of the following is an example of electromagnetic force?
a. motion of moon around earth
b. evolution of stars
c. evolution of galaxies
d. compression of spring
Q. Why is climbing a lamp post harder than climbing up a tree?
a. because of parallel friction force
b. because of contact force between the bodies
c. because of van der wall’s force
d. because of rope force
Q. When a body is falling freely under gravity, the total mechanical energy remains constant because of which of the following?
a. law of conservation of energy
b. unification of force
c. electromagnetic force
d. gravity
Q. What happens when a bullet is fired from a rifle?
a. the rifle becomes weightless
b. we fall back
c. rifle gives backward kick
d. bullet doesn’t leave the rifle
Q. Similitude is a concept applicable to the testing of
a. mathematical models
b. physical models
c. engineering models
d. chemical models
Q. Which among the following is the main application for Similitude?
a. ships
b. cars
c. hydraulics
d. train
Q. A model of with same shape is
a. geometric similarity
b. kinematic similarity
c. dynamic similarity
d. conditional similarity