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

Ratio of chemical A and B in boiler Y is 3 : 2 and Boiler X has ratio of chemical A to chemical B as 1 : 7, 16 litres of mixture is removed transferred from boiler X to boiler Y. What is the total capacity of boiler Y if capacity of boiler X is 144 litres and difference between chemical A and B in boiler Y after transfer is 25 litres? Assume that after transferring 16 litres from boiler X, boiler Y is running at full capacity

A

145 litres

B

150 litres

C

175 litres

D

201 litres

E

185 litres

The diameter of internal flue tubes in a Lancashire boiler compared to its shell is

A

One-half

B

One-third

C

Two-fourth

D

Two-fifth

Lancashire boiler has __________ internal flue tubes.

A

One

B

Two

C

Three

D

Four

Lancashire boiler has _____ internal flue tubes.

A

1

B

3

C

2

D

4

The number of flue tubes in Lancashire boiler is

A

Zero

B

One

C

Two

D

Four

How many fire tubes (Furnace tubes) does a Lancashire boiler has?

A

One

B

Two

C

Three

D

Four

In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

A

Are easier to clean

B

Are less prone to fouling

C

Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less

D

None of these

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If $${\sigma _{\text{t}}}$$ is the tensile stress for the shell material, then thickness of shell is equal to

A

$$\frac{{{\text{pd}}}}{{{\sigma _{\text{t}}}}}$$

B

$$\frac{{{\text{pd}}}}{{2{\sigma _{\text{t}}}}}$$

C

$$\frac{{{\text{pd}}}}{{3{\sigma _{\text{t}}}}}$$

D

$$\frac{{{\text{pd}}}}{{4{\sigma _{\text{t}}}}}$$

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

A

$${\left( {\frac{{6{\text{V}}}}{\pi }} \right)^{\frac{1}{2}}}$$

B

$${\left( {\frac{{6{\text{V}}}}{\pi }} \right)^{\frac{1}{3}}}$$

C

$${\left( {\frac{{6{\text{V}}}}{\pi }} \right)^2}$$

D

$${\left( {\frac{{6{\text{V}}}}{\pi }} \right)^3}$$

The cylindrical shell of a Lancashire boiler has diameter from

A

1 to 2 m

B

1.25 to 2.25 m

C

1.5 to 2.5 m

D

1.75 to 2.75 m

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

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