Practice Steam Boilers Multiple Choice Questions with Answers Quiz-3

Q.1.

A valve installed between the boiler and the feed pump is

Q.2.

Which is not correct statement about effect of sulphur in fuel?

It has heating value
It helps in electrostatic precipitation of ash in flue gases
It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
It erodes furnace walls

Q.3.

The principal function of a stop valve is to

Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Increase the temperature of saturated steam without raising its pressure

Q.4.

The best suited coal for chain or traveling grate stoker boiler is

Q.5.

The action of steam in a steam turbine is

Q.6.

Superheating of steam is done at

Q.7.

In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

Q.8.

Expanding steam to a very low pressure (high vacuum) in steam engines is

Q.9.

The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

Q.10.

In a reaction turbine

The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
The expansion of steam takes place partly in the fixed blades and partly in the moving blades
The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The pressure and temperature of steam remains constant