Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

48.25

35.5

81.25

43.75

48.25

35.5

81.25

43.75

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Heat Transfer
Which of the following has the highest thermal conductivity ?

Water

Black

Silver

Air

Water

Black

Silver

Air

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Heat Transfer
Pick out the correct equation.

JH = (St)1/3(Pr) = f/2

JH = (St)2/3(Pr) = f/2

JH = (St)(Pr)2/3 = f/2

JH = (St)(Pr)1/3 = f/2

JH = (St)1/3(Pr) = f/2

JH = (St)2/3(Pr) = f/2

JH = (St)(Pr)2/3 = f/2

JH = (St)(Pr)1/3 = f/2

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Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

hf could be greater or smaller than hd

hf > hd

hf = hd

hf < hd

hf could be greater or smaller than hd

hf > hd

hf = hd

hf < hd

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Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)

Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

Outlent temperature of both the hot and cold fluid are same

None of these

Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)

Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

Outlent temperature of both the hot and cold fluid are same

None of these

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Heat Transfer
The purpose of providing bleed points in the evaporator is to

Admit the feed

Remove the product

Facilitate removal of non-condensable gases

Create vacuum

Admit the feed

Remove the product

Facilitate removal of non-condensable gases

Create vacuum

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Heat Transfer

Heat Transfer Which of the following has the highest thermal conductivity ?

Heat Transfer Pick out the correct equation.

Heat Transfer For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

Heat Transfer LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Heat Transfer The purpose of providing bleed points in the evaporator is to

Heat Transfer
Which of the following has the highest thermal conductivity ?

Heat Transfer
Pick out the correct equation.

Heat Transfer
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Heat Transfer
The purpose of providing bleed points in the evaporator is to