Fluid Mechanics (Part-3) (General Engineering) (SSC JE)

Total Questions: 50

1. In a triangular channel having a side slope of 2 horizontal : 1 vertical, the Froude number is given by [BPSC AE (Civil) 14.10.2022 ]

Correct Answer: (c)
Solution:


2. Solve the following question: [BPSC AE (Civil) 14.10.2022 ]

Correct Answer: (b)
Solution:

3. A 3.0 m wide rectangular channel flowing at its normal depth of 0.8 m carries a discharge of 9.5 cumec. The bed slope of the channel is [BPSC AE (Civil) 14.10.2022 ]

Correct Answer: (b) steep
Solution:

4. In deriving the equation for the hydraulic jump in a rectangular channel in terms of conjugate depths and initial Froude number [BPSC AE (Civil) 14.10.2022 ]

Correct Answer: (c) continuity and momentum equations are used
Solution:

Continuity equation and momentum equation are used in deriving the equation for the hydraulic jump in terms of the conjugate depth and froude number.
• Energy equation is used to obtain the loss of energy in the jump.

5. A stationary hydraulic jump occurs in a rectangular channel with initial and sequent depth being equal to 0.40 m and 1.60 m respectively. Calculate initial Froude number and energy loss. [BPSC AE (Civil) 14.10.2022 ]

Correct Answer: (a)
Solution:


Note : The commission has not accepted any option ascorrect.

6. Equation of continuity of fluid is applicable only if [BPSC AE (GEN. ENGG.)-2006 ]

Correct Answer: (e) all the above
Solution:

Continuity equation– It states that when fluid is in motion, then it should move in such a way that mass is conserved.
Rate of flow in section (1)-(1) = Rate of flow in section (2)-(2)

7. Practical fluids possess [BPSC AE (GEN. ENGG.)-2006 ]

Correct Answer: (d) all the above
Solution:

Practical fluids possess viscosity, surface tension and compressibility. It is also called real fluid. The real fluids are actually available in nature.

Ideal fluids–An ideal fluid is one, which is incompressible and has no viscosity, such a fluid is only imaginary, as all existing fluid posses some viscosity.

8. Units of kinematic viscosity is [BPSC AE (GEN. ENGG.)-2006 ]

Correct Answer: (a) m²/sec
Solution:

9. Francis, Kaplan and propeller turbines fall under the category of [BPSC AE (GEN ENGG.)-03.12.2012 ]

Correct Answer: (b) reaction turbine
Solution:

Reaction turbine–In the reaction turbine the nozzle guide vanes only alter the direction of flow. The decrease in pressure and increase in velocity of the gas is accomplished by the convergent shape of the passage between the rotor blades. There are two types of impulse turbines: a velocity compounded impulse turbine and a pressure compounded impulse turbine.
• Francis, Kaplan and Propeller turbine fall under the category of reaction turbine.
• Turbines can also be classified on the basis of direction of flow through the runner into radial flow turbine, axial flow turbine (e.g. Kaplan), tangential flow turbine (e.g. Pelton) and mixed flow turbine (i.e. radial and axial).

10. Bernoulli equation deals with [BPSC AE (GEN ENGG.)-03.12.2012 ]

Correct Answer: (c) energy
Solution:

Bernoulli principle–In fluid dynamic, Bernoulli principle states that for an inviscid flow, an increase in the speed of the fliud occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.

• Bernoulli's principle can be derived from the principle of conservation of energy. This requires that the sum of kinetic energy, potential energy and internal energy remains constant.
Bernoulli's equation–