A. carbonisation of coal
B. passing steam over incandescent coke
C. passing air and a large amount of steam over waste coal at about 65°C
D. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
E. same way as the natural gas
Related Mcqs:
- Water gas is produced by ___________________ ?
A. carbonisation of coal
B. passing steam over incandescent coke
C. passing air and a large amount of steam over waste coal at about 65°C
D. partial combustion of caol, eke, anthractie coal or charcoal in a mixed air steam blast
E. same way as the natural gas - The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?
A. low
B. high
C. same
D. low/high depending on make and type
E. unpredictable - Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?
A. 2500°C
B. 2000°C
C. 1500°C
D. 1000°C
E. 700°C - The thrust on the rotor in a centrifugal compressor is produced by________________?
A. radial component
B. axial component
C. tangential component
D. resultant component - The ratio of specific weighf/h.p. of gas turbin and I.C engines may be typically of the order of_______________________?
A. 1 : 1
B. 2 : 1
C. 4 : 1
D. 1:2
E. 1 : 6 - There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
A. remain same
B. decrease
C. increase
D. unpredictable
E. none of the above - As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?
A. increases
B. decreases
C. remains same
D. first increases and then decreases
E. first decreases and then increases - In gas turbines^ high thermal efficiency is obtained in_________________?
A. closed cycle
B. open cycle
C. both of the above
D. closed/open depending on other con-siderations
E. unpredictable - Work ratio of a gas turbine may be improved by f____________________?
A. decreasing the compression work
B. increasing the compression work
C. increasing the turbine work
D. decreasing the turbine work
E. A. and C. above - Reheating in multistage expansion gas turbine results in____________________?
A. high thermal efficiency
B. reduction in compressor work
C. decrease of heat loss in exhaust
D. maximum work output
E. none of the above