A window glass of area (A) 1.5 m × 1 m and thickness...

Q.

A window glass of area (A) 1.5 m × 1 m and thickness (L) 6 mm is placed in a wall. If the outer (T1) and inner (T2) surface temperatures are 30°C and 20°C respectively, calculate the conduction heat transfer through the glass. Assume the thermal conductivity (K) of glass to be 0.78 W/mK.

A. 1740 W

B. 1590 W

C. 1660 W

D. 1950 W

Answer & Explanation

Answer : Option: D

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Q.

Viscosity of gases _______ with increase in temperature.

A. increase very rapidly

B. increase slowly

C. decrease slowly

D. remain unaffected

Answer & Explanation

Q.

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is

A. free convection

B. entry length problem in laminar forced conduction (developing thermal boundary layer)

C. mixed convection (both free and forced)

D. forced convection

Answer & Explanation

Q.

The ratio of kinematic viscosity to thermal diffusivity is called the _______ number.

A. Peclet

B. Prandtl

C. Stanton

D. Nusselt

Answer & Explanation

Q.

Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

A. Fourier's law

B. Newton's law of cooling

C. Fick's law

D. none of these

Answer & Explanation

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A window glass of area (A) 1.5 m &times; 1 m and thickness...

Q. A window glass of area (A) 1.5 m × 1 m and thickness (L) 6 mm is placed in a wall. If the outer (T1) and inner (T2) surface temperatures are 30°C and 20°C respectively, calculate the conduction heat transfer through the glass. Assume the thermal conductivity (K) of glass to be 0.78 W/mK.

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Comments :

More Questions Heat and Mass Transfer:

Q. Viscosity of gases _______ with increase in temperature.

Q. When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is

Q. The ratio of kinematic viscosity to thermal diffusivity is called the _______ number.

Q. Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

A window glass of area (A) 1.5 m × 1 m and thickness...

Q.

A window glass of area (A) 1.5 m × 1 m and thickness (L) 6 mm is placed in a wall. If the outer (T1) and inner (T2) surface temperatures are 30°C and 20°C respectively, calculate the conduction heat transfer through the glass. Assume the thermal conductivity (K) of glass to be 0.78 W/mK.

Q.

Viscosity of gases _______ with increase in temperature.

Q.

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is

Q.

The ratio of kinematic viscosity to thermal diffusivity is called the _______ number.

Q.

Convective heat transfer, in which heat is transferred by movement of warmed matter is described by