An
open tank contains two immiscible liquids of densities (800 kg/m3
and 1000 kg/m3) as shown in the figure. If g = 10 m/s2,
under static conditions, the gauge pressure at the bottom of the tank in Pa is
____________.
GATE
2013
Answer: 26000 Pa
The
apparent viscosity of a fluid is given by
(A)
Bingham plastic
(B)
Dilatants
(C)
Pseudoplastic
(D)
Thixotropic
GATE
2013
Answer: (B)
The
mass balance for a fluid with density (ρ) and velocity vector
is
GATE
2013
Answer: (A)
An
incompressible Newtonian fluid, filled in an annular gap between two concentric
cylinders of radii R1 and R2 as shown in the figure, is
flowing under steady state conditions. The outer cylinder is rotating with an
angular velocity of Ω while the inner cylinder is stationary. Given that (R2
– R1) <<R1, the profile of the θ-component of the
velocity Vθ can be approximated by,
GATE
2013
Answer: (D)
For
a Newtonian fluid flowing in a circular pipe under steady state conditions in
fully developed laminar flow, the Fanning friction factor is
(A) 0.046Re-0.2
(B) 0.0014
+ 0.125/Re0.32
(C) 16/Re
(D) 24/Re
GATE
2013
Answer: (C)
Water
(density 1000 kg/m3) is flowing through a nozzle, as shown below and
exiting to the atmosphere. The relationship between the diameters of the nozzle
at locations 1 and 2 is D1 = 4D2. The average velocity of
the stream at location 2 is 16 m/s and the frictional loss between location 1
and location 2 is 10000 Pa. Assuming steady state and turbulent flow, the gauge
pressure in Pa, at location 1 is ____________.
GATE
2013
Answer: 137500
Water is flowing
under laminar conditions in a pipe of length L. If the diameter of the pipe is
doubled, for a constant volumetric flow rate, the pressure drop across the pipe
(A)
Decreases 2 times
(B)
Decreases 16 times
(C)
Increases 2 times
(D)
increases 16 times
GATE
2012
Answer: (B)
The local
velocity of a fluid along a streamline can be measured by
(A)
Pitot tube
(B)
Venture meter
(C)
Rotameter
(D)
Orifice meter
GATE
2012
Answer: (A)
For uniform
laminar flow (in the x-direction) past a flat plate at high Reynolds number,
the local boundary layer thickness (δ) varies with the distance along the plate
(X) as
GATE
2012
Answer: (C)
In a mixing tank
operating at very Reynolds number (> 104), if the diameter of the impeller
is doubled (other conditions remaining constant), the power required increases
by a factor of
(A)
1/32
(B)
¼
(C)
4
(D)
32
GATE
2012
Answer: (D)
A bed of
spherical glass beads (density 3000 kg/m3, diameter 1 mm, bed
porosity 0.5) is to be fluidized by a liquid of density 1000 kg/m3
and viscosity 0.1 Pa.s. Assume that the Reynolds number based on particle
diameter is small compared to one. If g = 10 m/s2, then the minimum
velocity (in m/s) required to fluidize the bed is
(A)
3.33×10-4
(B)
3.33×10-1
(C)
3
(D)
30
GATE
2012
Answer: (A)
Same statement for next two
questions
A Newtonian fluid of viscosity µ
flows between two parallel plates due to the motion of the bottom plate as
shown below, which is moved with a velocity V. The top plate is stationary.
The
steady, laminar velocity profile in the x-direction is
GATE
2012
Answer: (D)
The
force per unit area (in the x-direction) that must be expected on the bottom plate
to maintain the flow is
(A)
μV/b
(B)
–μV/b
(C)
2μV/b
(D)
-2μV/b
GATE
2012
Answer: (A)
Consider
the following two cases of movement of particles. In Case I, the particle moves
along the positive y-direction and in case II, the particle moves along
negative y-direction. Gravity acts along the positive y-direction. Which ONE of
the following options corresponds to the CORRECT directions of buoyancy acting
on the particles?
(A)
Positive y-direction for both the cases
(B)
Negative y-direction for Case I,
positive y-direction for case II
(C)
Negative y-direction for both the cases
(D)
Positive y-direction for Case I,
negative y-direction for Case II
GATE
2011
Answer: (C)
In
an orifice meter, if the pressure drop across the orifice is overestimated by
5%, then the PERCENTAGE error in the measured flow rate is
(A)
+2.47
(B)
+5
(C)
-2.47
(D)
-5
GATE
2011
Answer: (A)
A
liquid is flowing through the following piping network. The length of pipe
sections P, Q, R and S shown in the schematic are equal. The diameter of the
sections P and R are equal and the diameter of the section Q is twice that of
S. The flow is steady and laminar. Neglecting curvature and entrance effects,
the ratio of the volumetric flow rate in the pipe section Q to that in S is
(A)
16
(B)
8
(C)
2
(D)
1
GATE
2011
Answer: (A)
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