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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 11
Q1 | Thermal equilibrium means that the flow of steam is ____________
- hyperbolic
- isothermal
- isentropic
- polytropic
Q2 | Multi-stage steam turbines are of the ___________
- reaction type
- velocity compounded type
- pressure compounded type
- all of the mentioned
Q3 | The impulse reaction turbine has its driving force ___________
- partly as an impulsive force and partly as a reaction force
- as an impulsive force
- as a reaction force
- none of the mentioned
Q4 | In a nozzle, whole frictional loss is assumed to occur between ___________
- inlet and throat
- throat and exit
- inlet and outlet
- none of the mentioned
Q5 | The ratio of total useful heat drop to the total isentropic heat drop is called?
- rankine efficiency
- stage efficiency
- internal efficiency
- none of the mentioned
Q6 | What is the action of steam in a steam turbine?
- neither static nor dynamic
- dynamic
- static
- both dynamic & static
Q7 | The critical pressure gives the velocity of steam at the throat ___________
- equal to the velocity of sound
- more than velocity of sound
- less than the velocity of light
- none of the mentioned
Q8 | The flow through a nozzle is regarded as ___________
- isothermal flow
- isobaric flow
- isochoric flow
- isentropic flow
Q9 | The steam leaves the nozzle at a ____________
- low pressure and a high velocity
- high pressure and a high velocity
- high pressure and a low velocity
- low pressure and a low velocity
Q10 | De-Laval turbine is a ____________
- multi rotor impulse turbine
- impulse reaction turbine
- single rotor impulse turbine
- none of the mentioned
Q11 | The Parsons’ reaction turbine has ____________
- only moving blades
- only fixed blades
- fixed and moving blades of different shape
- identical fixed and moving blades
Q12 | The ratio of the useful heat drop to the isentropic heat drop is called ____________
- condenser efficiency
- nozzle efficiency
- vacuum efficiency
- boiler efficiency
Q13 | Rateau turbine is ____________
- pressure-velocity compounded turbine
- simple reaction turbine
- velocity compounded turbine
- pressure compounded turbine
Q14 | The value of the reheat factor varies from ____________
- 1.08 to 1.10
- 1.2 to 1.6
- 1.6 to 2
- 1.02 to 1.06
Q15 | In reaction turbines, the axial thrust is due to ____________
- pressure drop across the rotor
- change in axial velocity
- both pressure drop across the rotor and change in axial velocity
- none of the mentioned
Q16 | The flow of steam is super-sonic ____________
- in the convergent portion of the nozzle
- at the entrance to the nozzle
- at the throat of the nozzle
- in the divergent portion of the nozzle
Q17 | The variation of steam pressure in the nozzle depends upon ____________
- dryness fraction of steam
- specific volume of steam
- velocity of steam
- all of the mentioned
Q18 | A binary vapour plant consists of ____________
- mercury boiler
- steam turbine
- steam condenser
- all of the mentioned
Q19 | The steam enters the nozzle at a ____________
- low pressure and a low velocity
- high pressure and a low velocity
- low pressure and a high velocity
- high pressure and a high velocity
Q20 | In a reaction turbine, when steam flows through the fixed blades ____________
- pressure decreases while velocity increases
- pressure increases while velocity decreases
- pressure and velocity both increases
- pressure and velocity both decreases
Q21 | Steam turbines are used for ____________
- electric power generation
- large marine propulsion
- direct drive of fans, compressors, pumps
- all of the mentioned
Q22 | Curtis turbine is a ____________
- pressure compounded turbine
- velocity compounded turbine
- simple reaction turbine
- pressure-velocity compounded turbine
Q23 | Which of the following statement is correct?
- the expansion of steam in a nozzle follows rankine cycle
- the friction in the nozzle increases the dryness fraction of steam
- the pressure of steam at throat is called critical pressure
- all of the mentioned
Q24 | What is the purpose of governing in steam turbines?
- reheat the steam and improve its quality
- maintain the speed of the turbine
- reduce the effective heat drop
- completely balance against end thrust
Q25 | The ratio of the isentropic heat drop to the heat supplied is called ____________
- stage efficiency
- reheat factor
- internal efficiency
- rankine efficiency