With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?

Byadmin March 3, 2019August 24, 2021

With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?

A. Decreases
B. Increases
C. Increases exponentially
D. Remain unaffected

Chemical Heat Transfer

The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?

The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?

A. 165.4
B. 167.5
C. 172.5
D. 175

Read More The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?
Chemical Heat Transfer

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________________?

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________________?

A. W/m.k
B. W/m
C. W/m.k2
D. None, ‘a’ is just a number

Read More The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________________?
Chemical Heat Transfer

In forced convection, the heat transfer depends on _______________?

In forced convection, the heat transfer depends on _______________?

A. Re, Pr
B. Re, Gr
C. Mainly Gr
D. Re only

Read More In forced convection, the heat transfer depends on _______________?
Chemical Heat Transfer

The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?

The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?

A. Average
B. Geometric mean
C. Product
D. Sum

Read More The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?
Chemical Heat Transfer

The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?

The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?

A. Steam ejector
B. Entrainment separator
C. Compressor
D. Vacuum pump

Read More The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?
Chemical Heat Transfer

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

A. Approach
B. Log mean temperature difference
C. Arithmetic mean temperature difference
D. Geometric mean temperature difference

Read More Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

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