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. Ratio of thermal efficiency to Rankine efficiency
pa = pm/K
pa = pm × K
pa = K/pm
pa = pm + K
21 %
23 %
30 %
40 %
Induced steam jet draught
Chimney draught
Forced steam jet draught
None of these
30 MW
60 MW
100 MW
500 MW
Increases the workdone through the turbine
Increases the efficiency of the turbine
Reduces wear on the blades
All of these
Equal to the velocity of sound
Less than the velocity of sound
More than the velocity of sound
None of these
Horizontal straight line
Vertical straight line
Straight inclined line
Curved line
Equal to unity
Less than unity
Greater than unity
None of these
Desirable
Economical
Essential
Uneconomical
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
Has no effect on
Decreases
Increases
None of these
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
5 to 6 m
6 to 7 m
7.25 to 9 m
9 to 10 m
Centrifugal pump
Axial flow pump
Gear pump
Reciprocating pump
225.65 kgf/ cm²
273 kgf/ cm²
100 kgf/ cm²
1 kgf/ cm²
Decrease dryness fraction of steam
Decrease specific volume of steam
Increase the entropy
Increase the heat drop
180° to each other
90° to each other
0° to each other
None of these
Steam enters and exhausts through the same port
Steam enters at one end and exhausts at the centre
Steam enters at the centre and exhausts at the other end
None of the above
ps - pa
pa - ps
pa + ps
None of these
Swept volume to the volume at cut-off
Volume at cut-off to the clearance volume
Volume at cut-off to the swept volume
Clearance volume to the volume at cut-off
Producer gas
Coal gas
Water gas
Blast furnace gas
Induced draft fan
Smoke meter
Chimney
Precipitator
0.007 bar
0.053 bar
0.06 bar
0.067 bar
Increases the mean effective pressure
Increases the workdone
Decreases the efficiency of the engine
All 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
To draw water
To circulate water
To drain off the water
All of these
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
(h - hf1)/2257
(h + hf1)/2257
(h × hf1)/2257
None of these
Pulverising coal in inert atmosphere
Heating wood in a limited supply of air at temperatures below 300°C
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Binding the pulverised coal into briquettes
Choked
Under-damping
Over-damping
None of these