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This set of Turbo Machines Multiple Choice Questions & Answers (MCQs) focuses on Turbo Machines Set 1
Q1 | Normal standard of compression for rotary compressor is
- polytropic compression
- constant pressure compression
- isentropic compression
- adiabatic compression
Q2 | The continuity equation in compressible fluids is derived on the basis of
- conservation of velocity head
- conservation of mass
- conservation of energy
- conservation of momentum
Q3 | Gas turbine used in aircraft is of
- closed cycle type with reheating and regeneration and intercooling
- closed cycle type with reheating
- open cycle type with reheating, regeneration and intercooling
- open cycle type
Q4 | 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 above
Q5 | The ratio of actual velocity to the local velocity of sound is called
- Velocity factor
- Speed ratio
- Mach number
- Velicity ratio
Q6 | Actual gas turbine cycle is different from ideal cycle because
- of internal irreversibility of the process due to friction, turbulence, etc.
- of variation of specific heats with temperature
- of losses due to incomplete combustion
- all of the above
Q7 | Gas turbines are taken to
- the gasoline and diesel engines in its working medium
- the petrol and diesel engines in its internal combustion
- the steam turbine in its aspect of steady flow of the working medium
- All of the above
Q8 | Which component of a gas turbine consumes maximum power?
- Combustion chamber
- Regenerator
- Starter
- Compressor
Q9 | Critical pressure for steam is
- 185.85 kg/cm2
- 245.55 kg/cm2
- 225.65 kg/cm2
- 212.55 kg/cm2
Q10 | Which of the following preferred for supercharging of internal combustion engines?
- Roots blower
- Reciprocating compressor
- Sliding vane type compressor
- Axial flow compressor
Q11 | Which gas turbine has lest weight per bhp developed?
- Simple open cycle gas turbine
- Open cycle gas turbine with intercooling, reheating and regeneration
- Closed cycle gas turbine
- Open cycle gas turbine with intercooling and reheating
Q12 | In which of the following plant inferior quality fuel can be used?
- Open cycle gas turbine with regeneration
- Open cycle gas turbine with intercooling
- Closed cycle gas turbine
- Open cycle gas turbine with reheating and regeneration
Q13 | Which of the following loss in steam turbines is negligible?
- Residual velocity loss
- Radiation loss
- Leakage loss
- Mechanical friction loss
Q14 | Most serious energy loss in reaction steam turbine
- Steam leakage between diaphragm and shaft
- Impact loss as steam enters moving blades
- Frictional resistance between steam and nozzle side
- Leakage over blade ends through radia clearance passages
Q15 | An axial flow compressor is suitable for
- low volume flow rates with high pressure rise
- high volume flow rates with a small pressure rise
- low volume flow rates with low pressure rise
- high volume flow rates with high pressure rise
Q16 | For a jet prepulsion unit, ideally the compressor work and turbine work are
- unequal
- equal
- not related to each other
- none of the above
Q17 | Stalling of the blades of axial flow compressor is
- an unsteady periodic and reversal of flow
- the fixed mass flow rate regardless of pressure ratio
- the reduction in lift force at higher angle of incidence
- none of the above
Q18 | In a two stage gas turbine plant reheating after first stage
- increases thermal efficiency
- decreases thermal efficiency
- doesoes not affect thermal efficiency
- none of the above
Q19 | In a nozzle if back pressure is equal to inlet pressure
- maximum flow occurs
- no flow occurs
- flow is subsonic in diverging section
- flow is supersonic in converging as well as supersonic sections
Q20 | The source of power for driving a turbocharger is
- chemical energy of exhaust gases
- air motor
- kinetic energy of exhaust gases from the engine
- electric motor
Q21 | The diverging portion of the nozzle acts as a diffuser for
- the subsonic flow
- the supersonic flow
- both the subsonic as well as supersonic flow
- none of the above
Q22 | Efficiency of gas turbine is increased by
- Reheating
- Intercooling
- Adding a regenerator
- All of the above
Q23 | Curtis turbine is
- a velocity pressure compounded turbine
- a velocity compounded turbine
- in impulse turbine
- a pressure compounded turbine
Q24 | Which of the following is a pressure compounded turbine?
- Parson's turbine
- Curtis turbine
- Rateau turbine
- All of the above
Q25 | The work ratio of closed cycle gas turbine plant with fixed top temperature of the cycle and fixed pressure ratio rp
- increases with increase in an inlet temperature to compressor
- increases with decrease in an inlet temperature to compresor
- remain same irrespective of inlet temperature to compressor
- none of the above