Category: Compressors, Gas Turbines and Jet Engines

A. isentropic compression
B. isothermal compression
C. polytropic compression
D. any one of the above
E. none of the above

A. large discharge at high pressure
B. low discharge at high pressure
C. large discharge at low pressure
D. low discharge at low pressure
E. there is no such limitation

A. better lubrication is possible advantages of multistage
B. more loss of air due to leakage past the cylinder
C. mechanical balance is better
D. air can be cooled perfectly in between
E. more uniform torque, light cylinder and saving in work

A. closed cycle gas turbine is an I.C engine
B. gas turbine uses same working fluid over and over again
C. air-fuel ratio in a gas turbine is 100 : 1
D. ideal efficiency of closed cycle gas turbine plant is more than carnot cycle efficiency
E. thrust in turbo-jet is produced by nozzle exit gases

A. at very high speed
B. at very slow speed
C. at average speed
D. at zero speed
E. isothermally

A. to accommedate Valves in the cylinder head
B. to provide cushioning effect
C. to attain high volumetric efficiency
D. to avoid mechanical bang of piston with cylinder head
E. to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

A. h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine
B. h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine
C. both the arrangements can be employed
D. all are connected in series
E. none of the above

A. atmosphere
B. back to the compressor
C. discharge nozzle
D. vacuum
E. none of the above

A. standard air
B. free air
C. compressed air
D. compressed air at delivery pressure
E. air sucked

A. heated
B. compressed air before entering the combustion chamber is heated
C. bled gas from turbine is heated and readmitted for complete expansion
D. exhaust gases drive the compressor
E. part of exhaust gases are heated and mixed up with atmospheric air to utilise exhaust heat