10 atmospheres
20 atmospheres
30 atmospheres
40 atmospheres
B. 20 atmospheres
Work done during the Rankine cycle
Work done during compression
Work done during adiabatic expansion
Change in enthalpy
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
Remains same
Decreases
Increases
None of these
Velocity increases
Velocity decreases
Velocity remains constant
Pressure remains constant
Zero
One
Two
Four
1 m
1.5 m
2 m
2.5 m
Lever safety valve
Dead weight safety valve
High steam and low water safety valve
Spring loaded safety valve
Velocity compounding
Pressure compounding
Pressure-velocity compounding
All of these
V = 44.72 hd K
V = 44.72 K hd
V = 44.72 K hd
V = 44.72 K hd
Create vacuum
Inject chemical solution in feed pump
Pump water, similar to boiler feed pump
Add make up water in the system
Increases
Decreases
Remain unaffected
First increases and then decreases
Locomotive boiler
Babcock and Wilcox boiler
Stirling boiler
All of the above
160/3 m/s
320/3 m/s
640/3 m/s
640 m/s
Blading efficiency
Nozzle efficiency
Stage efficiency
Mechanical efficiency
Keep the burner tips cool
Aid in proper combustion
Because sputtering, possibly extinguishing flame
Clean the nozzles
When the cross-section of the nozzle increases continuously from entrance to exit
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 the above
2 sin²α/(1 + sin²α)
2 cos²α/(1 + cos²α)
(1 + sin²α)/2 sin²α
(1 + cos²α)/2 cos²α
Has no effect on
Decreases
Increases
None of these
Reduce speed of rotor
Improve efficiency
Reduce exit losses
All of these
Ratio of thermal efficiency to Rankine efficiency
Ratio of brake power to the indicated power
Ratio of heat equivalent to indicated power to the energy supplied in steam
Product of thermal efficiency and Rankine efficiency
A steam turbine develops higher speeds
The efficiency of steam turbine is higher
The steam consumption is less
All of these
Carbon, hydrogen, nitrogen, sulphur, moisture
Fixed carbon, ash, volatile matter, moisture
Higher calorific value
Lower calorific value
Condenser efficiency
Vacuum efficiency
Nozzle efficiency
Boiler efficiency
Blow off cock
Stop valve
Superheater
None of these
Convection
Radiation
Conduction
Radiation and conduction
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
Equal to the velocity of sound
Less than the velocity of sound
More than the velocity of sound
None of these
Same
Less
More
None of these
Same as
2 times
4 times
8 times
To reduce the ratio of expansion in each cylinder
To reduce the length of stroke
To reduce the temperature range in each cylinder
All of the above