Heat flux through several resistances in series in analogous to the current flowing through several_____________________?

Byadmin March 3, 2019August 24, 2021

Heat flux through several resistances in series in analogous to the current flowing through several_____________________?

A. Resistances in parallel
B. Capacitors in series
C. Resistances in series
D. None of these

Chemical Heat Transfer

In a forward feed multiple effect, the pressure build up will be____________________?

In a forward feed multiple effect, the pressure build up will be____________________?

A. Least at the inlet of the first effect
B. Least at the outlet of the last effect
C. Highest at the inlet of the last effect
D. Highest at the outlet of the last effect

Read More In a forward feed multiple effect, the pressure build up will be____________________?
Chemical Heat Transfer

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?

A. Greater than that for un-insulated steam pipe
B. Less than that of the un-insulated steam pipe
C. Equal to that of the un-insulated steam pipe
D. Less than the steam pipe with 5 cms insulation

Read More A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?
Chemical Heat Transfer

Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?

Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?

A. 0.5
B. 2
C. 10
D. 100

Read More Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?
Chemical Heat Transfer

In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?

In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?

A. Tube layout
B. Tube diameter
C. Tube pitch
D. Number of baffles

Read More In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?
Chemical Heat Transfer

Which of the following is not used as a medium for high temperature heating ?

Which of the following is not used as a medium for high temperature heating ?

A. Dowtherm
B. Mercury
C. Liquid metal (e.g. molten sodium)
D. Fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

Read More Which of the following is not used as a medium for high temperature heating ?
Chemical Heat Transfer

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on its composition

Read More With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

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