Flue gases pass through tubes and water around it
Water passes through the tubes and flue gases around it
Forced circulation takes place
Tubes are laid vertically
A. Flue gases pass through tubes and water around it
Increases evaporative capacity of the boiler
Increases the efficiency of the boiler
Enables low grade fuel to be burnt
All of the above
Wet
Superheated
Remain dry saturated
Dry
To convert reciprocating motion of the piston into rotary motion
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To prevent fluctuation of speed
To keep the engine speed uniform at all load conditions
Blading efficiency
Nozzle efficiency
Stage efficiency
Mechanical efficiency
A fire tube boiler occupies less space than a water tube boiler, for a given power.
Steam at a high pressure and in large quantities can be produced with a simple vertical boiler.
A simple vertical boiler has one fire tube.
All of the above
4.75 mm
5.47 mm
7.45 mm
47.5 mm
Pressure drop across the rotor
Change in axial velocity
Both (A) and (B)
None of these
Superheater
Air-preheater
Economiser
Injector
One
Two
Three
Four
The efficiency of steam turbines is greater than steam engines
A flywheel is a must for steam turbine
The turbine blades do not change the direction of steam issuing from the nozzle
The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
Vb = 0.5 V cosα
Vb = V cosα
Vb = 0.5 V² cosα
Vb = V² cosα
1 kg/cm²
5 kg/cm²
10 kg/cm²
18 kg/cm²
Provide air around burners for obtaining optimum combustion
Transport and dry the coal
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Air delivered by forced draft fan
180° to each other
90° to each other
0° to each other
None of these
Have common piston rod
Are set at 90°
Have separate piston rod
Are set in V-arrangement
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is converted into steam in one pass without any recirculation
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
56 %
63 %
74 %
78 %
Where low speeds are required
For small power purposes and low speeds
For large power purposes
For small power purposes and high speeds
Blow off cock
Fusible plug
Stop valve
Safety valve
Receiver type compound engine
Tandem type compound engine
Woolf type compound engine
Both (A) and (B)
Blow off cock
Feed check valve
Steam stop valve
None of these
Drooping characteristic
Linear characteristic
Rising characteristic
Flat characteristic
Can be raised rapidly
Is raised at slower rate
Is raised at same rate
Could be raised at fast/slow rate depending on design
Increases
Decreases
Remain unaffected
First increases and then decreases
Horizontal fire tube boiler
Horizontal water tube boiler
Vertical water tube boiler
Vertical fire tube boiler
More heating surface
Less heating surface
Equal heating surface
Heating surface depends on other parameters
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
Enthalpy
Superheating
Super saturation
Latent heat
Frictional losses
It is not possible to achieve 0°K temperature
Leakage
Non availability of ideal substance