The flames and hot gases pass through the tubes which are surrounded by water

Water passes through the tubes which are surrounded by flames and hot gases

In fire tube boilers

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

Fire tube boilers are

A

Internally fired

B

Externally fired

C

Internally as well as externally fired

D

None of these

Fire tube boilers are those in which

A

Flue gases pass through tubes and water around it

B

Water passes through the tubes and flue gases around it

C

Forced circulation takes place

D

Tubes are laid vertically

Fire tube boilers are limited to a maximum working pressure of

A

0.17 MN/m²

B

1.7 MN/m²

C

17 MN/m²

D

170 MN/m²

Fire tube boilers are limited to a maximum design working pressure of

A

1 kg/cm

B

6 kg/cm

C

17 kg/cm²

D

100 kg/cm²

Very high pressure boilers are usually __________ boilers.

A

Fire tube

B

Water tube

C

Waste heat

D

Natural circulation

A fire broke out in a garments factory. How many minutes would it take for a fire truck to got to the fire 10 miles away if it travels at a rate of 20 mph?

A

10/20

B

20/10

C

60 * (10/20)

D

60 * (20 /10)

Steam in water tube boiler as compared to fire tube boiler

A

Can be raised rapidly

B

Is raised at slower rate

C

Is raised at same rate

D

Could be raised at fast/slow rate depending on design

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

A

Less than

B

1.25-1.50 times

C

2.5 times

D

One-fourth of

In fire tube boilers

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