1. Normal standard of compression for rotary compressor is adiabatic compression isentropic compression constant pressure compression polytropic compression 2. With increase in pressure ratio, thermal efficiency of a simple gas turbine plant with fixed turbine inlet temperature increases decreases first increases and then decreases None of the options 3. All of the following are positive displacement compressors EXCEPT Vane blower Screw compressor Axial flow compressor Roots blower 4. A regenerator can be used on open cycle gas turbines only closed cycle gas turbines only both open as well as closed cycle gas turbines None of the options 5. Which of the following rotary compressor has two shafts? Lobe type compressor Centrifugal compressor Sliding vane compressor Axial flow compressor 6. In rotory compressors, the ratio of isentropic work to Eulers work is known as slip factor degree of reaction pressure coefficient work factor 7. For a jet prepulsion unit, ideally the compressor work and turbine work are unequal equal not related to each other None of the options 8. The flow on two sides of a normal shock wave is supersonic subsonic supersonic on one side and subsonic on the other side sonic 9. Ljungstrom steam turbine is a mixed flow turbine radial flow turbine axial flow turbine any of the options 10. The continuity equation in compressible fluids is derived on the basis of conservation of energy conservation of mass conservation of velocity head conservation of momentum 11. An axial flow compressor has size of blades remains same only angles changes larger blades at gas entry and smaller blades at exit identical dlades at exit as well as entry smaller blades at gas entry and larger blades at exit 12. Though there are no cyclic variations even then rotary compressors need precise balancing because operating speeds are too high it is driven by an electric motor cooling arrangement does not exist It is bulky in size 13. De Laval turbine is used for applications requiring High power, low speed High power, high speed Low power, low speed Low power, high speed 14. Which of the following fluid can be used in binary vapour cycle? Aluminium bromide Diphenyl oxide Mercury any of the options 15. In a reheating gas turbine cycle, reheating is done by gases from intercooler by gases from turbine exhaust in separate combustion chamber any of the options 16. Which type of rotary compressor is used in oil fired furnaces? Centrifugal blower Sliding vane type blower Screw compressor Axial flow compressor 17. The ratio of actual velocity to the local velocity of sound is called Velocity factor Velicity ratio Speed ratio Mach number 18. A diffuser is used to decrease velocity as well as pressure increase velocity and decrease pressure decrease velocity and increase pressure increase velocity as well as pressure 19. In rotary compressors, slip factor is the ratio of isentropic work done to actual work stagnation pressure to static pressure outlet whirl velocity to the blade velocity None of the options 20. Surging is the reduction in lift force at higher angles of incidence the fixed mass flow rate regardless of pressure ratio an unsteady, periodic and reversal of flow in the compressor None of the options 21. Which gas turbine has lest weight per bhp developed? Open cycle gas turbine with intercooling, reheating and regeneration Closed cycle gas turbine Open cycle gas turbine with intercooling and reheating Simple open cycle gas turbine 22. An axial flow compressor is suitable for high volume flow rates with high pressure rise high volume flow rates with a small pressure rise low volume flow rates with high pressure rise low volume flow rates with low pressure rise 23. Gas turbine used in aircraft is of closed cycle type with reheating open cycle type closed cycle type with reheating and regeneration and intercooling open cycle type with reheating, regeneration and intercooling 24. Gas turbines are taken to the steam turbine in its aspect of steady flow of the working medium the gasoline and diesel engines in its working medium the petrol and diesel engines in its internal combustion All of the options 25. Which of the following steam turbine has identical fixed and moving blades? Rateau turbine Parsons turbine Curtis turbine None of the options 26. Bleeding in steam turbine refers to purposely withdrawn steam for process application leakage of steam through bearings purposely withdrawn for feed water heating leakage of steam through packings 27. In air compressor performance curve a surge line represents limit of compressor efficiency limit of stable operation limits of compressor discharge lower critical speed of shaft 28. In a velocity compounded steam turbine, as steam moves along moving and guide blades pressure is low and velocity gradually decreases pressure gradually increases and velocity is low Both pressure and velocity gradually increase. both pressure and velocity gradually decrease 29. In a gas turbine combined cycle plant, a waste heat boiler is used to heat air from intercooler gases from regenerator recover heat form exhaust gases None of the options 30. A constant volume combustion gas turbine operates on Joule cycle Ericsson cycle Brayton cycle Atkinson cycle 31. Actual gas turbine cycle is different from ideal cycle because of variation of specific heats with temperature of internal irreversibility of the process due to friction, turbulence, etc. of losses due to incomplete combustion All of the options 32. Which of the following preferred for supercharging of internal combustion engines? Sliding vane type compressor Axial flow compressor Reciprocating compressor Roots blower 33. In a two stage gas turbine plant reheating after first stage doesoes not affect thermal efficiency increases thermal efficiency decreases thermal efficiency None of the options 34. In an axial flow compressor, the pressure rise occurs in Moving blades only fixed blades only Both fixed and moving blades None of the options 35. In which of the following heat exchanger, heat is extracted from air? Regenerator Reheater Intercooler All of the options 36. In a nozzle if back pressure is equal to inlet pressure flow is supersonic in converging as well as supersonic sections flow is subsonic in diverging section no flow occurs maximum flow occurs 37. A diffuser converts thermal energy into kinetic energy converts pressure energy into kinetic energy converts potential energy into kinetic energy converts kinetic energy into thermal energy 38. The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called Blade efficiency Diagram efficiency slip factor Velocity ratio 39. Which of the following is a positive displacement rotory compressor? Centrifugal compressor Roots blower Axial flow compressor All of the options 40. Basic closed cycle for gas turbine is Carnot cycle Brayton cycle Rankine cycle None of the options 41. The following property is the most important for material used for gas turbine blades Fatigue Strength against direct force Strength against bending Group 42. The work ratio of closed cycle gas turbine plant with fixed top temperature of the cycle and fixed pressure ratio rp increases with decrease in an inlet temperature to compresor remain same irrespective of inlet temperature to compressor increases with increase in an inlet temperature to compressor None of the options 43. Overall efficiency of a gas turbine is less than Diesel cycle efficiency more than Otto or Diesel cycle efficiency equal to Rankine cycle efficiency equal to Carnot cycle efficiency 44. A roots blower compresses 0.06 cubic metres of air from 1.0 bar to 1.45 bar per revolution. The compressor efficiency is nearly 99% 63% 75% 87% 45. Generally, steam turbines in power stations operate at 1500 rpm 375 rpm 1000 rpm 3000 rpm 46. Which component of a gas turbine consumes maximum power? Starter Combustion chamber Compressor Regenerator 47. Stalling of the blades of axial flow compressor is the fixed mass flow rate regardless of pressure ratio the reduction in lift force at higher angle of incidence an unsteady periodic and reversal of flow None of the options 48. An ideal fluid for vapour turbine cycle should have high critical temperature with low pressure low critical temperature with high pressure low critical temperature with low presure high critical temperature with high pressure 49. Thermal efficiency of a gas turbine is in the range 30 to 40 percent 20 to 30 percent 50 to 60 percent 40 to 50 percent 50. The advantage of a gas turbine over a reciprocating engine is usually small working pressures perfect balancing of rotor continuous and uniform power All of the options Submit Answers Retake Test More Mechanical Engineering Study Material › Mechanical Engineering Mock Tests with AnswersApplied Mechanics Mock TestAutoCAD Mock TestAutomobile Engineering Mock TestCAD CAM and Automation Mock TestDesign of Machine Elements Mock TestDynamics of Machinery Mock TestDynamics of Machines Mock TestElectrical Drives and Controls Mock TestElectrical and Electronics Engineering Mock TestEnergy Conversion Mock TestEngineering Materials Mock TestEngineering Metallurgy Mock TestEngineering Thermodynamics Mock TestEnvironmental Engineering Mock TestFabrication Technology Mock TestFluid Mechanics and Hydraulic Machines Mock TestFluid Mechanics and Machinery Mock TestFoundry Technology Mock TestHeat Engines Mock TestHeat Transfer Mock TestIndustrial Engineering Mock TestInternal Combustion Engines Mock TestMachine Design Mock TestManufacturing Processes Mock TestManufacturing Technology Mock TestMass Transfe Mock TestMaterial Handling Mock TestMechanical Measurements Mock TestMechatronics Mock TestMetallurgy Mock TestMetrology and Measurements Mock TestNon Destructive Testing and Evaluation Mock TestPower Plant Engineering Mock TestPrinciples of Food Preservation Mock TestPrinciples of Programming Languages Mock TestProblem Solving and Python Programming Mock TestProcess Planning and Cost Estimation Mock TestProduct Design and Value Engineering Mock TestProduction Engineering Mock TestRefrigeration and Air conditioning Mock TestStrength of Materials Mock TestTheory of Machines Mock TestTheory of Mechanics Mock TestThermal Engineering Mock TestThermodynamics Mock TestTotal Quality Management Mock TestTurbo Machines Mock TestUnconventional Machine Process Mock TestUsability Engineering Mock Test Mechanical Engineering Mock Tests