This set of Heat Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Von- Karmal Equation”.

1. Glycerin at 10 degree Celsius flows past a flat plate at 20 m/s. Workout the velocity components at a point P(x, y) in the fluid flow where

x = 2 m from the leading edge of the plate

y = 5 cm from the plate surface

For glycerin at 10 degree Celsius, kinematic viscosity = 2.79 * 10 ^{-3} m^{2}/s

a) 15.92 m/s and 0.0952 m/s

b) 16.92 m/s and 0.0952 m/s

c) 17.92 m/s and 0.0752 m/s

d) 18.92 m/s and 0.0752 m/s

View Answer

Explanation: u/U

_{INFINITY }= 0L.846 and v/U

_{INFINITY }(Re)

^{½}= 0.57.

2. A plate 0.3 m long is placed at zero angle of incidence in a stream of 15 degree Celsius water moving at 1 m/s. Find out the stream wise velocity component at the mid-point of the boundary layer. For water at 15 degree Celsius

p = 998.9 kg /m^{3}

µ = 415.85 * 10 ^{-2} kg/hr m

a) 0.736 m/s

b) 0.636 m/s

c) 0.536 m/s

d) 0.436 m/s

View Answer

Explanation: n = y (U

_{INFINITY}/v x)

^{½}= 2.5.

3. Air at 25 degree Celsius flows over a flat surface with a sharp leading edge at 1.5 m/s. Find the boundary layer thickness at 0.5 from the leading edge. For air at 25 degree Celsius, kinematic viscosity = 15.53* 10n ^{-6} m^{2}/s

a) 4.1376 cm

b) 3.1376 cm

c) 2.1376 cm

d) 1.1376 cm

View Answer

Explanation: δ = 5 x/ (Re)

^{½}= 1.1376 m.

4. Local skin friction coefficient is given by

a) 0.646/ (Re)^{ 1/2}

b) 1.646/ (Re)^{ 1/2}

c) 2.646/ (Re)^{ 1/2}

d) 3.646/ (Re)^{ 1/2}

View Answer

Explanation: It should be 0.646/ (Re)

^{ ½}.

5. A plate 0.3 m long is placed at zero angle of incidence in a stream of 15 degree Celsius water moving at 1 m/s. Find out the maximum boundary layer thickness. For water at 15 degree Celsius. For water at 15 degree Celsius

p = 998.9 kg /m^{3}

µ = 415.85 * 10 ^{-2} kg/hr m

a) 4.945 m

b) 3.945 m

c) 2.945 m

d) 1.945 m

View Answer

Explanation: Re = l p U

_{INFINITY}/µ.

6. Shear stress at the middle of the plate is given by

a) T _{W} = 0.964 p U _{INFINITY }^{2}/2 (Re) ^{1/2}

b) T _{W} = 0.864 p U _{INFINITY }^{2}/2 (Re) ^{1/2}

c) T _{W} = 0.764 p U _{INFINITY }^{2}/2 (Re) ^{1/2}

d) T _{W} = 0.664 p U _{INFINITY }^{2}/2 (Re) ^{1/2}.

View Answer

Explanation: T

_{W}= 3 µ U

_{INFINITY}/2 δ = 0.664 p U

_{INFINITY }

^{2}/2 (Re)

^{½}.

7. Boundary layer thickness is given by

a) δ = 5.64 x/ (Re) ^{½}

b) δ = 5.64 x/ (Re) ^{½}

c) δ = 6.64 x/ (Re) ^{½}

d) δ = 7.74 x/ (Re) ^{½}

View Answer

Explanation: δ/x = (140 * 2/13)

^{½}(µ/x p U

_{INFINITY})

^{½}.

8. Air at 25 degree Celsius flows over a flat surface with a sharp leading edge at 1.5 m/s. Find the value of Reynolds number. For air at 25 degree Celsius, kinematic viscosity = 15.53* 10n ^{-6} m^{2}/s

a) 38694

b) 12846

c) 48294

d) 76386

View Answer

Explanation: Re = x U

_{INFINITY}/v = 48294.

9. A plate 0.3 m long is placed at zero angle of incidence in a stream of 15 degree Celsius water moving at 1 m/s. Find out the maximum value of the normal component of velocity at thr trailing edge of the plate. For water at 15 degree Celsius

p = 998.9 kg /m^{3}

µ = 415.85 * 10 ^{-2} kg/hr m

a) 1.6885 * 10 ^{-2} m/s

b) 1.6885 * 10 ^{-3} m/s

c) 1.6885 * 10 ^{-4} m/s

d) 1.6885 * 10 ^{-5} m/s

View Answer

Explanation: v/U

_{INFINITY }(Re)

^{½ }=0.860.

**Sanfoundry Global Education & Learning Series – Heat Transfer.**

To practice all areas of Heat Transfer, __here is complete set of 1000+ Multiple Choice Questions and Answers__.