In a boiling curve, the peak heat flux is called the __________ point.

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because

A

Convection becomes important

B

Conduction becomes important

C

Radiation becomes important

D

Sub-cooled boiling occurs

The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

A

Cracking

B

Fractional distillation

C

Full distillation

D

Carbonisation

Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method

A

Is more accurate in finding the number of equilibrium stages

B

Accounts for the enthalpy changes in the process

C

Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method

D

All of the above

Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.

A

Boiling point

B

Dynamic viscosity

C

Kinematic viscosity

D

Density

Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

A

Film

B

Nucleate

C

Transition

D

All of the above

In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.

A

Film

B

Nucleate

C

Transition

D

All of the above

Point A is 10 miles West of Point B. Point b is 30 miles North of pint C. Point C is 20 miles East of Point D. What is the distance (in miles) between Point A and Point D?

A

1010

B

1020

C

2010

D

3010

Point A is 10 km west of point B. Point B is 30 km north of point C. Point C is 20 km east of point D. What is the distance between point A and D?

A

1020Km

B

1010Km

C

2010Km

D

3010Km

The burnout heat flux in the nucleate boiling regime is not a function of the

A

Liquid density

B

Vapour density

C

Temperature difference

D

Heat of evaporation

In the free convection regime of pool boiling, the heat flux is proportional to

A

$$\Delta {{\text{t}}^{\frac{1}{2}}}$$

B

Δt²

C

$$\Delta {{\text{t}}^{\frac{5}{4}}}$$

D

Δt

In a boiling curve, the peak heat flux is called the __________ point.

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