# Fluid Dynamics - Mechanical Engineering (MCQ) questions and answers

1)   The cylindrical portion of short length, which connects converging and diverging section of venturimeter, is called as

a. diffuser
b. connector
c. throat
d. manometer tube
 Answer  Explanation ANSWER: throat Explanation: No explanation is available for this question!

2)   Venturimeter consists of short converging conical tube which has a total inclination angle of

a. 11 ± 1o
b. 21 ± 1o
c. 30 ± 1o
d. 60 ± 1o
 Answer  Explanation ANSWER: 21 ± 1o Explanation: No explanation is available for this question!

3)   Which of the following devices does not use Bernoulli's equation as its working principle?

a. Venturimeter
b. Orifice-meter
c. Pitot tube
d. None of the above
 Answer  Explanation ANSWER: None of the above Explanation: No explanation is available for this question!

4)   Which of the following sentences are true for Bernoulli's equation?

1. Bernoulli's principle is applicable to ideal incompressible fluid
2. The gravity force and pressure forces are only considered in Bernoulli's principle
3. The flow of fluid is rotational for Bernoulli's principle
4. The heat transfer into or out of fluid should be zero to apply Bernoulli's principle

a. (1), (2) and (3)
b. (1), (3) and (4)
c. (1), (2) and (4)
d. (1), (2), (3) and (4)
 Answer  Explanation ANSWER: (1), (2) and (4) Explanation: No explanation is available for this question!

5)   What is the correct formula for Euler's equation of motion?

Where,
ρ = density of the fluid
p = pressure force
g = acceleration due to gravity
v = velocity of the fluid

a. (∂p / ρ) + (∂g / ρ) + (∂v / ρ) = 0
b. (∂p / ρ) + (∂g / ρ) + (v dv) = 0
c. (∂p / ρ) + (g dz) + (v dv) = 0
d. (p dp) + (g dz) + (v dv) = 0
 Answer  Explanation ANSWER: (∂p / ρ) + (g dz) + (v dv) = 0 Explanation: No explanation is available for this question!

6)   In a steady, ideal flow of an incompressible fluid, total energy at any point of the fluid is always constant. This theorem is known as

a. Euler's theorem
b. Navier-stockes theorem
c. Reynold's theorem
d. Bernoulli's theorem
 Answer  Explanation ANSWER: Bernoulli's theorem Explanation: No explanation is available for this question!

7)   When the net force acting on a fluid is the sum of only gravity force, pressure force and viscous force, the equation is called as

a. Reynold's equation of motion
b. Navier-stockes equation of motion
c. Euler's equation of motion
d. none of the above
 Answer  Explanation ANSWER: Navier-stockes equation of motion Explanation: No explanation is available for this question!

8)   The net force of an ideal flow is equal to the sum of nonzero values of

a. pressure force and gravity force
b. viscous force and gravity force
c. pressure force and viscous force
d. pressure force, viscous force and compressibility force
 Answer  Explanation ANSWER: pressure force and gravity force Explanation: No explanation is available for this question!

9)   Which of the following forces generally act on fluid while considering fluid dynamics?

1. Viscous force
2. Pressure force
3. Gravity force
4. Turbulent force
5. Compressibility force

a. (1), (3), (4) and (5)
b. (1), (2), (3) and (5)
c. (1), (2), (3) and (4)
d. (1), (2), (3), (4) and (5)
 Answer  Explanation ANSWER: (1), (2), (3), (4) and (5) Explanation: No explanation is available for this question!

10)   The study of force which produces motion in a fluid is called as

a. fluid statics
b. fluid dynamics
c. fluid kinematics
d. none of the above
 Answer  Explanation ANSWER: fluid dynamics Explanation: No explanation is available for this question!