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Hot questions in Fluid Mechanics and Thermal Sciences

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GATE ME 2012 | Question: 6
For an opaque surface, the absorptivity ($\alpha$), transmissivity ($\tau$) and reflectivity ($\rho$) are related by the equation $\alpha + \rho = \tau$ $\rho + \alpha + \tau =0$ $\alpha + \rho =1$ $\alpha + \rho =0$
For an opaque surface, the absorptivity ($\alpha$), transmissivity ($\tau$) and reflectivity ($\rho$) are related by the equation$\alpha + \rho = \tau$$\rho + \alpha + \t...
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ISRO2009-8
The pressure drop for a relatively low Reynolds number flow in a $600 \: \text{mm}, \: 30 \: \text{m}$ long pipeline is $70 \;\text{kPa}$. What is the wall shear stress? $0 \;\text{Pa}$ $1400 \;\text{Pa}$ $700 \;\text{Pa}$ $350 \;\text{Pa}$
The pressure drop for a relatively low Reynolds number flow in a $600 \: \text{mm}, \: 30 \: \text{m}$ long pipeline is $70 \;\text{kPa}$. What is the wall shear stress?$...
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ISRO2009-6
A necessary precaution in selection of pumps for parallel operations is that $\text{H-Q}$ characteristics of both should be identical Both pumps should be centrifugal type Both pumps should be identical There should not be change from positive to negative slope in H-Q curve
A necessary precaution in selection of pumps for parallel operations is that$\text{H-Q}$ characteristics of both should be identicalBoth pumps should be centrifugal typeB...
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ISRO2009-10
At the eye tip of a centrifugal impeller, blade velocity is $200 \: \text{m/s}$ while the uniform axial velocity at the inlet is $150 \: \text{m/s}$. If the sonic velocity is $300 \: \text{m/s}$, then the inlet Mach number of the flow will be $0.75$ $0.66$ $0.90$ $0.83$
At the eye tip of a centrifugal impeller, blade velocity is $200 \: \text{m/s}$ while the uniform axial velocity at the inlet is $150 \: \text{m/s}$. If the sonic velocit...
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ISRO2009-1
A hydraulic press has a ram of $15 \: \text{cm}$ diameter and plunger of $1.5 \: \text{cm}$. It is required to lift a mass of $1000 \: \text{kg}$. The force required on plunger is nearly equal to $100\;\text{N}$ $1000\;\text{N}$ $10000\;\text{N}$ $10\;\text{N}$
A hydraulic press has a ram of $15 \: \text{cm}$ diameter and plunger of $1.5 \: \text{cm}$. It is required to lift a mass of $1000 \: \text{kg}$. The force required on p...
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ISRO2009-9
The radiative heat transfer rate per unit area $(W/m2)$ between two plane parallel grey surfaces (emissivity $0.9$) maintained at $400 \: \text{K}$ and $300 \: \text{K}$ is (Stefan Bottzman constant $\sigma=5.67 \times 10^{-6} \;W/m^2K^4)$ $1020$ $464$ $812$ $567$
The radiative heat transfer rate per unit area $(W/m2)$ between two plane parallel grey surfaces (emissivity $0.9$) maintained at $400 \: \text{K}$ and $300 \: \text{K}$ ...
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ISRO2009-4
The relation ${p^{V}}^{\gamma}=$ constant, where $\gamma$ is the ratio of the specific heats of ideal gas, is applicable to Any adiabatic process Only reversible adiabatic process Only irreversible adiabatic process Only isothermal process
The relation ${p^{V}}^{\gamma}=$ constant, where $\gamma$ is the ratio of the specific heats of ideal gas, is applicable toAny adiabatic processOnly reversible adiabatic ...
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ISRO2009-2
If the stream function is given by $\Psi=3xy$, then the velocity at a point $(2,3)$ will be $7.21 \: \text{unit}$ $18 \: \text{unit}$ $10.82 \: \text{unit}$ $54 \: \text{unit}$
If the stream function is given by $\Psi=3xy$, then the velocity at a point $(2,3)$ will be$7.21 \: \text{unit}$$18 \: \text{unit}$$10.82 \: \text{unit}$$54 \: \text{unit...
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ISRO2009-5
Across a normal shock Static pressure and the static temperature rise entropy remains constant velocity and static pressure decrease density and temperature decrease
Across a normal shockStatic pressure and the static temperature riseentropy remains constantvelocity and static pressure decreasedensity and temperature decrease
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GATE2018-1-22
A flat plate of width $L=1 \: m$ is pushed down with a velocity $U=0.01 \: m/s$ towards a wall resulting in the drainage of the fluid between the plate and the wall as sown in the figure. Assume two-dimensional incompressible flow and that the plate remains ... $m/s$) draining out at the instant shown in the figure is ____ (correct to three decimal places).
A flat plate of width $L=1 \: m$ is pushed down with a velocity $U=0.01 \: m/s$ towards a wall resulting in the drainage of the fluid between the plate and the wall as so...
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GATE2018-1-33
A tank open at the top with a water level of $1$ m, as shown in the figure, has a hole at a height of 0.5 m. A free jet leaves horizontally from the smooth hole. The distance X (in m) where the jet strikes the floor is $0.5$ $1.0$ $2.0$ $4.0$
A tank open at the top with a water level of $1$ m, as shown in the figure, has a hole at a height of 0.5 m. A free jet leaves horizontally from the smooth hole. The dist...
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GATE2018-1-24
For a Pelton wheel with a given water jet velocity, the maximum output power from the Pelton wheel is obtained when the ratio of the bucket speed to the water jet speed is _____ (correct to two decimal places)
For a Pelton wheel with a given water jet velocity, the maximum output power from the Pelton wheel is obtained when the ratio of the bucket speed to the water jet speed i...
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GATE2018-2-55
A vehicle powered by a spark ignition engine follows air standard Otto cycle ($\gamma =1.4$). The engine generates $70$ kW while consuming $10.3$ kg/hr of fuel. The calorific value of the fuel is $44,000 \: kJ/kg$. The compression ratio is _________ (correct to two decimal places.
A vehicle powered by a spark ignition engine follows air standard Otto cycle ($\gamma =1.4$). The engine generates $70$ kW while consuming $10.3$ kg/hr of fuel. The calor...
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