Fluid Mechanics (Part-2) (General Engineering) (SSC JE)

Total Questions: 50

21. The continuity equation for a steady flow states that - [RSMSSB JE (E & M) Degree- 20.05.2022]

Correct Answer: (c) Efflux rate of mass through the control surfaces is zero
Solution:

22. Pseudo - plastic is a fluid for which - [RSMSSB JE (E & M) Degree- 20.05.2022]

Correct Answer: (a) Dynamic viscosity decreases as the rate of shear increases
Solution:


23. In Pelton turbines, as flow takes place, there is change in - [RSMSSB JE (E & M) Degree- 20.05.2022]

Correct Answer: (a) Velocity only
Solution:

Pelton turbines is an impulse turbine in which pressure is constant throughout turbine. Therefore, only kinetic energy is available.

24. Solve tghe following question: [RSMSSB JE (E & M) Degree- 20.05.2022]

Correct Answer: (b)
Solution:

25. In order to avoid cavitation in centrifugal pumps which one of the following helps? [RSMSSB JE (E&M) Degree - 26/12/2020 ]

Correct Answer: (d) High suction pressure
Solution:

Formation of vapour bubble in flowing liquid when the pressur of the liquid decreases below the vapour pressure of the fluid is called as cavitation.
• In centrifugal pump cavitation can occurs at the inlet of the impeller or at suction side. To avoid the cavitation, pressure or suction side is kept to be high in these pumps.

26. Which of the following is the unit of Kinematic viscosity? [RSMSSB JE (E&M) Degree - 26/12/2020 ]

Correct Answer: (c) Stoke
Solution:

27. If w is the specific weight of liquid and h is the depth of any point from the surface, then pressure intensity at that point will be [RSMSSB JE (E&M) Degree - 26/12/2020 ]

Correct Answer: (b) wh
Solution:

28. An ideal flow of any fluid must fulfill the following : [RSMSSB JE (E&M) Degree - 26/12/2020 ]

Correct Answer: (d) Continuity Equation
Solution:

An ideal flow of any fluid must fulfil the continuity equation.

29. Which one of the following is not a unit of dynamic viscosity? [RSMSSB JE (E&M) Degree - 26/12/2020 ]

Correct Answer: (d) Stokes
Solution:

30. Unit of mass density is - [RSMSSB JE (E&M) Degree - 26/12/2020 ]

Correct Answer: (b) kg/m³
Solution:

Mass density( ρ )–It is the ratio of mass to volume that represents the denseness of molecules in substance.