Temperature, time, and turbulence
Total air, true fuel, and turbulence
Thorough mixing, total air and temperature
Total air, time, and temperature
A. Temperature, time, and turbulence
Horizontal fire tube boiler
Horizontal water tube boiler
Vertical water tube boiler
Vertical fire tube boiler
Straight
Circular
Curved
None of these
Same as
2 times
4 times
8 times
One fourth
Half
One
Two
Constant volume flow
Constant pressure flow
Isothermal flow
Isentropic flow
0.1 to 0.2 kg
0.2 to 0.4 kg
0.6 to 0.8 kg
1.0 to 1.5 kg
0.4
0.56
0.67
1.67
Increases
Decreases
Remain unaffected
First increases and then decreases
Low
Moderate
High
None of these
Locomotive boiler
Cochran boiler
Cornish boiler
Babcock and Wilcox boiler
Equivalent evaporation
Factor of evaporation
Boiler efficiency
Power of a boiler
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
To indicate the water level inside the boiler to an observer
To measure pressure of steam inside the steam boiler
None of the above
(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [(n + 1)/2] n - (1/n)
Create vacuum in furnace
Create vacuum at turbine exhaust
Pump feed water
Dose chemicals in feed water
Infinitely long
Around 200 meters
Equal to the height of the hot gas column producing draught
Outside temperature is very low
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
Increases evaporative capacity of the boiler
Increases the efficiency of the boiler
Enables low grade fuel to be burnt
All of the above
Equal to
Less than
More than
None of these
Work done during the Rankine cycle
Work done during compression
Work done during adiabatic expansion
Change in enthalpy
ηS = ηB × ηN
ηS = ηB / ηN
ηS = ηN / ηB
None of these
One-half the height of chimney
Equal to the height of chimney
Two times the height of chimney
Four times the height of chimney
Cumulative heat drop to the isentropic heat drop
Isentropic heat drop to the heat supplied
Total useful heat drop to the total isentropic heat drop
None of the above
Swept volume to the volume at cut-off
Clearance volume to the swept volume
Volume at cut-off to the swept volume
Swept volume to the clearance volume
Steam jet
Centrifugal fan
Chimney
Both (A) and (B)
Vb = 0.5 V cosα
Vb = V cos α
Vb = 0.5 V² cosα
Vb = V² cosα
Inherent moisture and surface moisture are different things
In some coals moisture may be present up to 40%
Some moisture in coal helps in better burning which is not possible with completely dry coal
It increases thermal efficiency
Corrosion
Scale
Carryover
All of the above
Solid and vapour phases are in equilibrium
Solid and liquid phases are in equilibrium
Liquid and vapour phases are in equilibrium
Solid, liquid and vapour phases are in equilibrium
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
Area of nozzle at throat
Initial pressure and volume of steam
Final pressure of steam leaving the nozzle
Both (A) and (B)