The frequency at which the electromagnetic radiation given off by a black body...

Q.

The frequency at which the electromagnetic radiation given off by a black body radiator is most intense, is completely determine by the black body's

A. Frequency

B. Size

C. Shape

D. Temperature

Answer & Explanation

Answer : Option: D

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Q.

What will be the heat flux across a flat board of thickness 40 mm and area 2 m² if the temperature difference across its surfaces is 30°C. Assume that the thermal conductivity of the material is 0.095 W/mK.

A. 356.3 W/m2

B. 35.63 W/m2

C. 3.563 W/m2

D. 3563 W/m2

Answer & Explanation

Q.

A mild steel ball of diameter 1.2 cm is initially at a temperature of 873 K and is exposed to air at 300 K. Find the time needed to cool the steel ball to 368 K. Assume that the convection heat transfer coefficient is 0.114 kW/m² K. Also find the heat transfer rate after 120s.

A. 2.1 min, 3.9 W

B. 2.1 min, 8.9 W

C. 2.1 min, 4.9 W

D. 2.1 min, 5.9 W

Answer & Explanation

Q.

Find the heat gain per hour by a 2 m long copper tube that is 1 cm in diameter carrying F12 at −30°C when exposed to still air at 40°C

A. 53 W

B. 54W

C. 58 W

D. 59 W

Answer & Explanation

Q.

What should be the temperature difference across a slab of thickness 1 m, having a thermal conductivity 0.1 W/m K, in order to obtain a heat flux of 3 W/m² ?

A. 0.38°C

B. 308°C

C. 380°C

D. 0.038°C

Answer & Explanation

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The frequency at which the electromagnetic radiation given off by a black body...

Q. The frequency at which the electromagnetic radiation given off by a black body radiator is most intense, is completely determine by the black body's

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More Questions Heat and Mass Transfer:

Q. What will be the heat flux across a flat board of thickness 40 mm and area 2 m2 if the temperature difference across its surfaces is 30°C. Assume that the thermal conductivity of the material is 0.095 W/mK.

Q. A mild steel ball of diameter 1.2 cm is initially at a temperature of 873 K and is exposed to air at 300 K. Find the time needed to cool the steel ball to 368 K. Assume that the convection heat transfer coefficient is 0.114 kW/m2 K. Also find the heat transfer rate after 120s.

Q. Find the heat gain per hour by a 2 m long copper tube that is 1 cm in diameter carrying F12 at −30°C when exposed to still air at 40°C

Q. What should be the temperature difference across a slab of thickness 1 m, having a thermal conductivity 0.1 W/m K, in order to obtain a heat flux of 3 W/m2 ?

Q.

The frequency at which the electromagnetic radiation given off by a black body radiator is most intense, is completely determine by the black body's

Q.

What will be the heat flux across a flat board of thickness 40 mm and area 2 m² if the temperature difference across its surfaces is 30°C. Assume that the thermal conductivity of the material is 0.095 W/mK.

Q.

A mild steel ball of diameter 1.2 cm is initially at a temperature of 873 K and is exposed to air at 300 K. Find the time needed to cool the steel ball to 368 K. Assume that the convection heat transfer coefficient is 0.114 kW/m² K. Also find the heat transfer rate after 120s.

Q.

Find the heat gain per hour by a 2 m long copper tube that is 1 cm in diameter carrying F12 at −30°C when exposed to still air at 40°C

Q.

What should be the temperature difference across a slab of thickness 1 m, having a thermal conductivity 0.1 W/m K, in order to obtain a heat flux of 3 W/m² ?