Fluid Mechanics and Thermal Sciences - Online Test
Q1. The figure below represents a triangle PQR with initial
coordinates of the vertices as P(1,3),Q(4,5) and R(5,3.5). The triangle
is rotated in the X-Y plane about the vertex P by angle θ in clockwise
direction. If sinθ= 0.6 and cosθ= 0.8, the new coordinates of the
vertex 𝑄 are
Answer : Option A
Explaination / Solution:
Since the triangle is rotated in CW direction, hence, for the new point
Q’ (x,y),
x > 4 and y < 5 __________(1)
and PQ = PQ’ or QR = Q’R’
Now we can get the answer easily by checking the option
Q2. In order to have maximum power from a Pelton turbine, the bucket speed must be
Answer : Option B
Explaination / Solution:
Explanation:
Since, velocity of bucket = ½ times the velocity of jet.
Q3. Consider one-dimensional steady state heat conduction along x-axis 
through a plane wall with the boundary surfaces (x = 0 and x = L) maintained at temperatures 0ºC and 100ºC. Heat is generated uniformly throughout the wall. Choose the CORRECT statement.
through a plane wall with the boundary surfaces (x = 0 and x = L) maintained at temperatures 0ºC and 100ºC. Heat is generated uniformly throughout the wall. Choose the CORRECT statement.
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. A cylinder contains 5m3 of ideal gas at a pressure of 1 bar. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this process is
Answer : Option A
Explaination / Solution:
Q5. Consider fully developed flow in a circular pipe with negligible entrance length effects.
Assuming the mass flow rate, density and friction factor to be constant, if the length of the
pipe is doubled and the diameter is halved, the head loss due to friction will increase by a
factor of
Answer : Option D
Explaination / Solution:
Q6. For an ideal gas with constant values of specific heats, for calculation of the specific enthalpy,
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. For flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate
temperature, the thermal boundary layer is
Answer : Option D
Explaination / Solution:
No Explaination.
Q8. A 10 mm diameter electrical conductor is covered by an insulation of 2 mm thickness. The
conductivity of the insulation is 0.08 W/m-K and the convection coefficient at the insulation
surface is 10 W/m2 -K. Addition of further insulation of the same material will
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. Match the following pairs:
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. Considering massless rigid rod and small oscillations, the natural frequency (in rad/s) of
vibration of the system shown in the figure is
Answer : Option D
Explaination / Solution:
No Explaination.
