Explore topic-wise MCQs in Heat Transfer.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.

A flat plate 1 m by 1 m is placed in a wind tunnel. The velocity and temperature of free stream air are 80 m/s and 10 degree Celsius. The flow over the whole length of the plate is made turbulent by turbulizing grid placed upstream of the plate. Find the heat flow from the surface of the plate

A. 9424.5 W
B. 8424.5 W
C. 7424.5 W
D. 6424.5 W
Answer» D. 6424.5 W
Discussion
2.

A flat plate 1 m by 1 m is placed in a wind tunnel. The velocity and temperature of free stream air are 80 m/s and 10 degree Celsius. The flow over the whole length of the plate is made turbulent by turbulizing grid placed upstream of the plate. Find the thickness of the hydrodynamic boundary layer at trailing edge of the plate

A. 19.55 mm
B. 18.55 mm
C. 17.55 mm
D. 16.55 mm
Answer» E.
Discussion
3.

With respect to above problem, find the value of Nusselt number

A. 2000.89
B. 3000.89
C. 4000.89
D. 5000.89
Answer» B. 3000.89
Discussion
4.

During test-run, air flows at 215 m/s velocity and 25 degree Celsius temperature past a smooth thin model airfoil which can be idealized as a flat plate. If the chord length of the airfoil is 15 cm, find drag per unit width. The relevant physical properties of air are
p = 1.82 kg/m3

A. nv = 15.53 * 10 <sup>-6</sup> m<sup>2</sup>/s
B. 25.42 N per unit width
C. 35.42 N per unit width
D. 45.42 N per unit width
E. 55.42 N per unit width
Answer» B. 25.42 N per unit width
Discussion
5.

The average drag coefficient for turbulent boundary layer flow past a thin plate is given by
C f = 0.455/ (log 10 R el) 2.58

A. nWhere R <sub>el </sub>is the Reynolds number based on plate length. A plate 50 cm wide and 5 m long is kept parallel to the flow of water with free stream velocity 3 m/s. Calculate the drag force on both sides of the plate. For water, kinematic viscosity = 0.01 stokes
B. 53.38 N
C. 63.38 N
D. 73.38 N
E. 83.38 N
Answer» C. 63.38 N
Discussion