Equal to the velocity of sound
Less than the velocity of sound
More than the velocity of sound
None of these
A. Equal to the velocity of sound
Increases
Decreases
Remain constant
May increase or decrease depending upon the method of storage
Prevent the bulging of flat surfaces
Avoid explosion in furnace
Prevent leakage of hot flue gases
Support furnace freely from top
Frictional losses
It is not possible to achieve 0°K temperature
Leakage
Non availability of ideal substance
Approach temperature should be as low as possible
Handling and maintenance should be easier
Heat transfer area should be optimum
Stack gases should not be cooled to the dew point
Maintain the speed of the turbine
Reduce the effective heat drop
Reheat the steam and improve its quality
Completely balance against end thrust
Producer gas
Coal gas
Water gas
Blast furnace gas
Cornish is fire tube and Lancashire is water tube
Cornish is water tube and Lancashire is fire tube
Cornish has two fire tubes and Lancashire has one
Lancashire has two fire tubes and Cornish has one
Equal to unity
Less than unity
Greater than unity
None of these
(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)
4.75 mm
5.47 mm
7.45 mm
47.5 mm
Equal to
Less than
Higher than
None of these
1 to 2 m
1.25 to 2.25 m
1.5 to 2.5 m
1.75 to 2.75 m
Better burning
More calorific value
Less radiation loss
Medium sized units
Increases expansion ratio of steam
Reduces back pressure of steam
Reduces temperature of exhaust steam
All of these
Choked
Under-damping
Over-damping
None of these
Create vacuum
Inject chemical solution in feed pump
Pump water, similar to boiler feed pump
Add make up water in the system
Wholly in blades
Wholly in nozzle
Partly in the nozzle and partly in blades
None of these
Lancashire boiler
Locomotive boiler
Babcock and Wilcox boiler
Benson boiler
Condenser efficiency
Vacuum efficiency
Nozzle efficiency
Boiler efficiency
Infinitely long
Around 200 meters
Equal to the height of the hot gas column producing draught
Outside temperature is very low
A steam turbine develops higher speeds
The efficiency of steam turbine is higher
The steam consumption is less
All of these
100 tonnes/h
135 tonnes/h
175 tonnes/h
250 tonnes/h
α₁ = α₂ and β₁ = β₂
α₁ = β₁ and α₂= β₂
α₁ < β₁ and α₂ > β₂
α₁ = β₂ and β₁ = α₂
Condenser efficiency
Vacuum efficiency
Nozzle efficiency
Boiler efficiency
Locomotive boiler
Cochran boiler
Cornish boiler
Babcock and Wilcox boiler
Prevent flat surfaces under pressure from tearing apart
Take care of failure in shear
Take care of failure in compression
Provide support for boiler
The efficient steam jacketing of the cylinder walls
Superheating the steam supplied to the engine cylinder
Keeping the expansion ratio small in each cylinder
All of the above
Higher calorific value at constant volume
Lower calorific value at constant volume
Higher calorific value at constant pressure
Lower calorific value at constant pressure
Multi tubular
Horizontal
Internally fired
All of the above
Avoid excessive build up of pressure
Avoid explosion
Extinguish fire if water level in the boiler falls below alarming limit
Control steam dome