# Practice Test: Question Set - 05

**1. Bernoulli's equation is not applicable, when the flow is**

- (A) Irrotational

- (B) Incompressible

- (C) Viscous

- (D) All (a), (b) & (c)

**2. In case of a pipe exit fitted with a nozzle, the**

- (A) Conversion of kinetic head to pressure head is facilitated

- (B) Conversion of pressure head to kinetic head is facilitated

- (C) Power transmitted through the nozzle is maximum, when the head lost
due to friction in the pipe is equal to one third of the total supply head

- (D) Both (b) and (c)

**3. Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure.**

- (A) Increase

- (B) Decrease

- (C) Not change

- (D) Exponentially decrease

**4. With increase in molecular weight of the gas, the head developed by a centrifugal compressor will**

- (A) Decrease

- (B) Increase

- (C) Remain same

- (D) Unpredictable

**5. Newton's law of viscosity relates the**

- (A) Shear stress and velocity

- (B) Velocity gradient and pressure intensity

- (C) Shear stress and rate of angular deformation in a fluid

- (D) Pressure gradient and rate of angular deformation

**6. Pick out the wrong statement.**

- (A) The eddy viscosity is a function of the type of turbulence involved

- (B) The eddy viscosity is a fluid property

- (C) The viscosity of gas increases with increase in temperature

- (D) The viscosity of a liquid increases with decrease in temperature

**7. Which is the most efficient and best for measuring very small flow rate of gases?**

- (A) Venturimeter

- (B) Orificemeter

- (C) Rotameter

- (D) Flow nozzle

**8. One poise (unit of absolute/dynamic viscosity) is equivalent to one**

- (A) gm/cm

^{2}. sec

- (B) gm/cm. sec

- (C) cm

^{2}/sec

- (D) m

^{2}/sec

**9. For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as**

- (A)

*d*

- (B)

*d*

^{2}

- (C)

*d*

^{4}

- (D)

*d̅*

^{2}

**10. Drag is defined as the force exerted by the**

- (A) Fluid on the solid in a direction opposite to flow

- (B) Fluid on the solid in the direction of flow

- (C) Solid on the fluid

- (D) None of these

**11. For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.**

- (A) Logarithmic

- (B) Parabolic

- (C) Hyperbolic

- (D) Linear

**12. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)**

- (A) N

^{2}D

^{3}

- (B) ND

^{2}

- (C) N

^{2}D

- (D) N

^{3}D

^{5}

**13. A free jet of water of cross-sectional area 0.01m**

^{2}and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is- (A) 200 N

- (B) 400 N

- (C) 2000 N

- (D) 4000 N

**14. Pick out the wrong statement.**

- (A) Surface tension of a liquid is because of the difference in
magnitude of adhesive & cohesive forces

- (B) A hydrometer used for the determination of
specific gravities of liquids works on the principle of buoyant forces

- (C) In case of unsteady fluid flow, the velocity at any given point does
not change with time

- (D) Turbulent fluid flow is characterized by the rapid fluctuation of
instantaneous pressure & velocity at a point

**15. A relief valve**

- (A) Provides back pressure for a cylinder

- (B) Unloads a pump

- (C) Is a directional control valve

- (D) None of these

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