The diameter of flue tube in a Cornish boiler is _________ that of the shell.

The diameter of fire tube of Cornish boiler compared to its shell is

A

One half

B

One third

C

One fourth

D

One fifth

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A

More

B

Less

C

Equal

D

None of these

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

A

More heating surface

B

Less heating surface

C

Equal heating surface

D

Heating surface depends on other parameters

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

A

CO₂

B

N₂

C

O₂

D

CO

Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

A

Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler

B

Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler

C

Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes

D

Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube

The difference between Cornish boiler and Lancashire boiler is that

A

Former is fire tube type and latter is water tube type boiler

B

Former is water tube type and latter is fire tube type

C

Former contains one fire tube and latter contains two fire tubes

D

None of the above

In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)

A

$$\frac{{4\left( {{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$

B

$$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$

C

$$\frac{{4{{\text{p}}^2}}}{{\pi {\text{d}}}}$$

D

$$\frac{{\pi {\text{d}}}}{{4{{\text{p}}^2}}}$$

The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.

A

One-fourth

B

One-third

C

Two-fifth

D

One-half

In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

A

3-5

B

5-11

C

8-15

D

12-18

The diameter of Cornish boiler is of the order of

A

1 - 2 m

B

1.5 - 2.5 m

C

2 - 3 m

D

2.5 - 3.5 m

The diameter of flue tube in a Cornish boiler is _________ that of the shell.

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