Outline of Boilers

This quiz contains multiple-choice problems on boiling basics and equipment, boiling curve properties and calculations, reboiler classifications, and reboiler types.

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In which type of boiling the temperature of steam is above its boiling point?

Superheated steam Super-saturated steam Leiden frost steam Saturated steam

Which of the following boilers can be classified based on the position of water and hot gases?

Fire tube

Natural convection

External-fired

Internal-fired

There are two types of water feeding in a boiler; they are __ and __

Open-feed system and closed-feed system

Condensed and raw

Feed water and clean water

Hot and cold water

In a fire tube boiler, the water to be heated is kept in the

Tubes of the setup

Shell of the setup with hot gas in tubes

Tank with a fire chamber that conducts heat by steel rods

Tank and heated by fire below it

In water tube boilers, the flue/heating gases are passed through the __ of the setup.

Outer surface of the tank

Tubes of the setup

Covering shell

Chamber inside the water tank

When water is boiled, it releases saturated steam. Which one of the following industries cannot use this type of steam?

Steam locomotive

Food heating

Sanitation

Cooking

Water tube boilers generally give __ steam production rates and __ storage capacity than the fire tubes’ setup.

low, high

high, low

low, low

high, high

In flash boilers, the water is passed through __, which is/are very hot and lead(s) to quick vapour conversion or steam flashes.

Furnaces

Superheated steam

Sub-cooled steam

Explosives

The efficiency of the steam plant decreases by using superheated steam plants owing to the increased cost and consumption of fuels. True or false?

True

False

In a supercritical steam generator, water pressure is kept __ the critical pressure so that the water becomes steam directly and rotates turbines for electricity production.

Below

Above

Equal to

Much below

What boiling type involves a liquid temperature lower than saturation temperature and boiling occurring only in the heated surface’s vicinity?

Sub-cooled boiling

Superheated boiling

Saturated boiling

Pool boiling

The phenomenon of minimum heat flux in stable film boiling when heating a fluid with a tube is known as

Nucleate effect

Bubbling effect