Top 250+ Solved Fluid Mechanics and Machinery MCQ Questions Answer

From 1 to 15 of 202

Q. The specific gravity of a liquid has

a. the same unit as that of mass density

b. the same unit as that of weight density

c. the same unit as that of specific volume

d. no unit

  • d. no unit

Q. The specific volume of a liquid is the reciprocal of

a. weight density

b. mass density

c. specific weight

d. specific volume

  • b. mass density

Q. Which one of the following is the unit of specific weight?

a. n = m3

b. n = m2

c. n = m

d. n = ms

  • a. n = m3

Q. [p] = [m]/[v] = [m] /[L3] = [ML-3].

a. [m1 l-3 t0].

b. [m1 l0 t0].

c. [m0 l-3 t0].

d. [m0 l0 t0].

  • d. [m0 l0 t0].

Q. What is D’Alembert’s Paradox?

a. resistance= 0

b. drag force= 0

c. temperature = 0

d. pressure gradient= 0

  • b. drag force= 0

Q. The steady- state flow must satisfy

a. kirchhoff’s law

b. newtons law

c. rutherford’s experiment

d. kepler’s law

  • a. kirchhoff’s law

Q. Which among the following does not depend on the friction factor?

a. pipe diameter

b. fluid density

c. viscosity

d. weight

  • d. weight

Q. How do we calculate losses for a larger range of Reynolds number?

a. moody chart

b. bar chart

c. scatter chart

d. column histogram

  • a. moody chart

Q. Darcy- Weisbach equation gives relation between                     

a. pressure and temperature

b. mass, volume and pressure

c. head loss and pressure loss

d. pressure loss only

  • c. head loss and pressure loss

Q. Which among the following is formula for friction factor of circular pipes?

a. 16/re

b. 64/re

c. re/16

d. re/64

  • b. 64/re

Q. Loss of head due to friction is                      

a. directly proportional to hydraulic radius

b. inversely proportional to velocity

c. inversely proportional to hydraulic radius

d. directly proportional to gravitational constant

  • c. inversely proportional to hydraulic radius

Q. What are the reasons for minor head loses in a pipe?

a. friction

b. heat

c. valves and bends

d. temperature

  • c. valves and bends

Q. What happens to the head loss when the flow rate is doubled?

a. doubles

b. same

c. triples

d. four times

  • d. four times

Q. The liquid flowing through a series of pipes can take up                     

a. pipes of different diameters

b. pipes of the same diameters only.

c. single pipe only

d. short pipes only

  • a. pipes of different diameters
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