Boiler tube size is specified by its thickness and __________ diameter.

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

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

The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

A

Increases

B

Decreases

C

Remains unchanged

D

Increases/decreases depending on steam temperature requirements

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

A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

A

Blow off cock

B

Fusible plug

C

Stop valve

D

Safety valve

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

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

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

A

d

B

$$\frac{1}{{\text{d}}}$$

C

$$\sigma $$

D

$$\frac{l}{\sigma }$$

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A

Water space also

B

Chimney

C

Steam space

D

Superheater

Boiler tube size is specified by its thickness and __________ diameter.

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