Top 250+ Solved Fluid Mechanics and Machinery MCQ Questions Answer
Q. Which of the following is a 50 percent reaction turbine?
a. parsons turbine
b. curtis turbine
c. rateau turbine
d. pelton wheel
Q. The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by
a. 57% decrease
b. 57% increase
c. 43% decrease
d. 43% increase
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. The total head loss for the system is equal to
a. pipe length
b. pipe diameter
c. width of the reservoir
d. height difference of reservoirs
Q. that is developed in the pipe?
a. entry
b. exit
c. connection between two pipes
d. liquid velocity
Q. If the two reservoirs are kept at the same level, the head loss is
a. z1-z2
b. zero
c. t2-t1
d. s2-s1
Q. How do we determine the total discharge through parallel pipes?
a. add them.
b. subtract them
c. multiply them
d. divide them
Q. The pipe diameter is
a. directly proportional to fluid density
b. directly proportional to mass flow rate
c. inversely proportional to mass flow rate
d. directly proportional to fluid velocity
Q. Define Viscosity.
a. resistance to flow of object
b. resistance to flow of air
c. resistance to flow of fluid
d. resistance to flow of heat