Water tube boilers are those in which

Very high pressure boilers are usually __________ boilers.

A

Fire tube

B

Water tube

C

Waste heat

D

Natural circulation

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

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

A

Increases

B

Decreases

C

Remain unaffected

D

First increases and then decreases

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

Water tube boilers are

A

Internally fired

B

Externally fired

C

Internally as well as externally fired

D

None of these

In water tube boilers

A

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

B

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

C

Forced circulation takes place

D

None of these

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

Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.

A

1.25

B

1.75

C

2.5

D

3.5

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

A

Infinity

B

Zero

C

Same as average heat transfer co-efficient for tube side

D

None of these

Water tube boilers are those in which

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