More heating surface
Less heating surface
Equal heating surface
Heating surface depends on other parameters
A. More heating surface
Fixed blades
Moving blades
Both fixed and moving blades
None of these
Avoid excessive build up of pressure
Avoid explosion
Extinguish fire if water level in the boiler falls below alarming limit
Control steam dome
Inlet and throat
Inlet and outlet
Throat and exit
All of these
12 m
1.52.5 m
23 m
2.53.5 m
Increases
Decreases
Remain constant
May increase or decrease depending upon the method of storage
Lowers the boiling point of a liquid
Raises the boiling point of a liquid
Does not affects the boiling point of a liquid
Reduces its volume
Condenser
Condensate pump
Air extraction pump
All of these
Area of the actual indicator diagram to the area of theoretical indicator diagram
Actual workdone per stroke to the theoretical workdone per stroke
Actual mean effective pressure to the theoretical mean effective pressure
Any one of the above
Throttling calorimeter
Separating calorimeter
Combined separating and throttling calorimeter
Bucket calorimeter
78-81 %
81-85 %
85-90 %
90-95 %
Internally fired
Externally fired
Internally as well as externally fired
None of these
Piston diameter, length of stroke and calorific value of fuel
Piston diameter, specific fuel consumption and Calorific value of fuel
Piston diameter, length of stroke and speed of rotation
Specific fuel consumption, speed of rotation and torque
LaMont boiler
Lancashire boiler
Velox boiler
Benson boiler
Bismuth
Copper
Aluminium
Nickel
Former occupies less space for same power
Rate of steam flow is more in former case
Former is used for high installed capacity
Chances of explosion are less in former case.
Blow off cock
Feed check valve
Economiser
Fusible plug
0°C
100°C
Saturation temperature at given pressure
Room temperature
Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler
Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler
Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes
Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube
ps - pa
pa - ps
pa + ps
None of these
1 m
1.5 m
2 m
2.5 m
Condenser efficiency
Vacuum efficiency
Nozzle efficiency
Boiler efficiency
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place
None of these
Blow off cock
Feed check valve
Steam stop valve
None of these
Side by side and each cylinder has common piston, connecting rod and crank
Side by side and each cylinder has separate piston, connecting rod and crank
At 90° and each cylinder has common piston, connecting rod and crank
At 90° and each cylinder has separate piston, connecting rod and crank
1 kg/cm
6 kg/cm
17 kg/cm²
100 kg/cm²
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Brake thermal efficiency
Initial conditions of steam
Back pressure
Initial pressure of steam
All of these
Increase thermal efficiency of boiler
Economise on fuel
Extract heat from the exhaust flue gases
Increase flue gas temperature
CO₂
CO
O₂
N₂
Choked
Under-damping
Over-damping
None of these