Fluid Mechanics and Thermal Sciences - Online Test
Q1. The velocity profile of a fully developed laminar flow in a straight circular pipe, as shown in the
figure, is given by the expression u (r) = 
where dp/dx is a constant. The average
velocity of fluid in the pipe is
where dp/dx is a constant. The average
velocity of fluid in the pipe is
Answer : Option A
Explaination / Solution:
No Explaination.
Q2. Match the items in Column I and Column II.
Column I Column II
P. Metallic Chills 1. Support for the core
Q. Metallic Chaplets 2. Reservoir of the molten metal
R. Riser 3. Control cooling of critical sections
S. Exothermic Padding 4. Progressive solidification
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. The inlet and the outlet conditions of steam for an adiabatic steam turbine are as indicated in the
notations are as usually followed
If mass flow rate of steam through the turbine is 20kg/s, the power output of the turbine (in MW ) is
Answer : Option A
Explaination / Solution:
No Explaination.
Q4. The inlet and the outlet conditions of steam for an adiabatic steam turbine are as indicated in the notations are as usually followed
Assume the above turbine to be part of a simple Rankine cycle. The density of water at the inlet to
the pump is 1000kg/m3. Ignoring kinetic and potential energy effects, the specific work (in kJ/kg)
supplied to the pump is
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and the warmer one being maintained at 727oC, the lower plate ( plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227oC. Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady state conditions to exist. Stefan Boltzmann constant is given as 5.67 × 10-8 W/m2K4
The irradiation (in kW/m2) for the upper plate (plate 1) is
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and the warmer one being maintained at 727oC, the lower plate ( plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227oC. Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady state conditions to exist. Stefan Boltzmann constant is given as 5.67 × 10-8 W/m2K4
If plate 1 is also a diffuse and gray surface with an emissivity value of 0.8, the net radiation heat
exchange (in kW/m2) between plate 1 and plate 2 is
Answer : Option D
Explaination / Solution:
No Explaination.
Q7. The maximum velocity of a one-dimensional incompressible fully developed
viscous flow, between two fixed parallel plates, is 6ms-1. The mean velocity (in
ms-1) of the flow is
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. A turbo-charged four-stroke direct injection diesel engine has a displacement
volume of 0.0259m3 (25.9litres). The engine has an output of 950kW at
2200rpm. The mean effective pressure in MPa is closest to
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. One kilogram of water at room temperature is brought into contact with a high
temperature thermal reservoir. The entropy change of the universe is
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. A hydraulic turbine develops 1000kW power for a head of 40m. If the head is
reduced to 20m, the power developed (in kW) is
Answer : Option B
Explaination / Solution:
No Explaination.
