STEAM BOILERS, ENGINES, NOZZLES AND TURBINES QUIZ

1000 J

3600 kW/sec

360 kJ

3600 kJ

The steam is expanded in nozzles only and there is a pressure drop and heat drop

The steam is expanded both in fixed and moving blades continuously

The pressure and temperature of steam remains constant

The steam is expanded in moving blades only

Babcock and Wilcox boiler

Locomotive boiler

Benson boiler

Lancashire boiler

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades to the energy supplied to the blades

None of these

When the cross-section of the nozzle decreases continuously from entrance to exit

When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

None of these

When the cross-section of the nozzle increases continuously from entrance to exit

Brake power

None of these

Frictional power

Indicated power

Pressure of steam in kg/cm²

Temperature of steam in °C

All of these

Tonnes/hr. of steam

It erodes furnace walls

It has heating value

It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

It helps in electrostatic precipitation of ash in flue gases

Does not effect

Increases

Decreases

None of these

Overall efficiency

Brake thermal efficiency

Indicated thermal efficiency

Mechanical efficiency