# Practice Test: Question Set - 51

**1. Baffles in mixing tanks are provided to**

- (A) Reduce swirling and
vortex formation

- (B) Increase
the structural strength of the tank

- (C) Aid in rotational
flow

- (D) None of these

**2. Bernoulli's equation describes the**

- (A) Mechanical energy
balance in potential flow

- (B) Kinetic energy
balance in laminar flow

- (C) Mechanical energy
balance in turbulent flow

- (D) Mechanical energy
balance in boundary layer

**3. __________ is used for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline.**

- (A) Venturimeter

- (B) Pressure gauge

- (C) Pitot tube

- (D) Orificemeter

**4. A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)**

- (A) 0.01

- (B) 0.1

- (C) 1

- (D) 10

**5. In case of laminar flow of fluid through a circular pipe, the**

- (A) Shear stress over the
cross-section is proportional to the distance from the surface of the pipe

- (B) Surface of velocity
distribution is a paraboloid of revolution, whose volume equals half the volume
of circumscribing cylinder

- (C) Velocity
profile varies hyperbolically and the shear stress remains constant over the
cross-section

- (D) Average flow occurs
at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

**6. C**

_{p}/C_{v}is termed as- (A) Adiabatic
constant

- (B) Mach
number

- (C) Weber
number

- (D) Prandtl
number

**7. Pick out the wrong statement about cavitation.**

- (A) Sudden reduction of
pressure in a fluid flow system caused by flow separation, vortex formation or
abrupt closing of valve leads to cavitation

- (B) Cavitation may be
caused due to boiling of liquid by decreasing the pressure resulting in
formation & collapse of vapor cavities

- (C) Cavitation begins at
higher static pressure and lower velocity in larger diameter pipelines
resulting in audible noise

- (D) Large scale
cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine
blades

**8. For pumping slurry, one can use a __________ pump.**

- (A) Reciprocating

- (B) Diaphragm

- (C) Centrifugal

- (D) Pneumatic

**9. Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is**

- (A) 10 √2π

- (B) 5π/2

- (C) 5 √2π

- (D) 5π/√2

**10. The pump used for irrigation purposes is generally designed for**

- (A) Large capacity &
high head

- (B) Large capacity &
low head

- (C) Small capacity &
high head

- (D) Small capacity &
low head

**11. Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.**

- (A) ∂/∂t = 0

- (B) ∂/∂t = constant

- (C) ∂/∂s = 0

- (D) ∂/∂s = constant

**12. Viscosity of a liquid decreases __________ with rise in temperature.**

- (A) Exponentially

- (B) Linearly

- (C) Logarithmically

- (D) None of these

**13. Hydraulic radius of 6" × 12" cross-section, is __________ inches.**

- (A) 2

- (B) 0.5

- (C) 1.5

- (D) None of these

**14. Pressure gradient in the pipe flow is influenced by the**

- (A) Diameter of pipe

- (B) Velocity of the fluid

- (C) Density &
viscosity of the fluid

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

**15. One stoke (unit of kinematic viscosity) is equivalent to**

- (A) 1 cm

^{2}/second

- (B) 1 m

^{2}/second

- (C) 1 gm/cm. second

- (D) 1 kg. m/second

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