Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview

Subject: Fluid Mechanics 15

**Part 3: List for questions and answers of Fluid Mechanics**

**Q1.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

**Q2. 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

**Q3. 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

**Q4. 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

**Q5. 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

**Q6. Euler’s equation of motion can be integrated when it is assumed that**

a) The fluid is incompressible

b) Bernoulli’s satisfied

c) Continuity equation is satisfied

d) Velocity potential exists and the density is constant

**Q7. The rate at which fluid flows through a closed pipe can be determined by**

a) Determining the mass flow rate

b) Determining the volume flow rate

c) Either (a) or (b)

d) None of these

**Q8. Conveyor-based methods is used for the measurement of the flow of**

a) Solids

b) Liquid

c) Gas

d) All of these

**Q9. For the measurement of flow rate of liquid, the method used is**

a) Conveyor-based methods

b) Bourdon tube

c) Coriolis method

d) Thermal mass flow measurement

**Q10. The devices used for flow obstruction is/are**

a) Orifice plate

b) Venturi tube

c) Flow nozzle and fall flow tube

d) All of these

**Q11. The device which is used for making temporary measurements of flow is**

a) Venturi

b) Dull flow tube

c) Orifice plate

d) Pitot static tube

**Q12. For the measurement of flow the cheapest device is**

a) Venturi

b) Dall flow tube

c) Flow nozzle

d) Pitot static tube

**Q13. The instrument which is not suitable for the application in automatic control scheme**

a) Rotameters

b) Pitot static tube

c) Rotary piston meter

d) Orifice plate

**Q14. Example for positive displacement meter is**

a) Variable area flow meter

b) Turbine meters

c) Rotary piston meter

d) Venturi

**Q15. Turbine meters are generally preferred for**

a) Low-viscosity and high flow measurements

b) High viscosity and low flow measurements

c) High viscosity and high flow measurements

d) Low viscosity and low flow measurements

**Q16. The flow meter which is replacing the differential pressure meters in its applications is**

a) Vortex-shedding flow meter

b) Electromagnetic flow meters

c) Ultrasonic flow meters

d) All of these

**Q17. What is temporal mean velocity?**

a) The average of velocities at a point over a certain period of time

b) The average of velocities of a single particle over different locations in a fluid flow

c) The average of velocities of a diffrent particle over single locations in a fluid flow

d) None of these

**Q18. Friction factor for laminar flow is given by**

a) (Re /64)

b) (64 / Re)

c) (Re / 16)

d) (16 / Re)

**Q19. Kinematic eddy viscosity (ε) is the ratio of**

a) Eddy viscosity (η) to dynamic viscosity (μ)

b) Eddy viscosity (η) to kinematic viscosity (ν)

c) Kinematic viscosity to eddy viscosity (η)

d) Eddy viscosity (η) to mass density (ρ)

**Q20. Magnitude of eddy viscosity for laminar flow is**

a) Less than zero

b) Zero

c) Greater than zero

d) Unpredictable

**Part 3: List for questions and answers of Fluid Mechanics**

Q1. Answer: b

Q2. Answer: d

Q3. Answer: d

Q4. Answer: b

Q5. Answer: a

Q6. Answer: d

Q7. Answer: c

Q8. Answer: a

Q9. Answer: c

Q10.

Q11. Answer: c

Q12. Answer: c

Q13. Answer: a

Q14. Answer: c

Q15. Answer: a

Q16. Answer: a

Q17. Answer: a

Q18. Answer: b

Q19. Answer: d

Q20. Answer: b