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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 12
Q1 | The reheat factor depends upon ____________
- exit pressure
- turbine stage efficiency
- initial pressure and superheat
- all of the mentioned
Q2 | What is the critical pressure ratio for initially dry saturated steam?
- 0.546
- 0.577
- 0.586
- 0.578
Q3 | In an impulse turbine, steam expands ____________
- wholly in nozzle
- partly in the nozzle and partly in blades
- wholly in blades
- none of the mentioned
Q4 | A steam nozzle converts ____________
- heat energy of steam into potential energy
- potential energy into heat energy of steam
- heat energy of steam into kinetic energy
- kinetic energy into heat energy of steam
Q5 | If the critical pressure ratio for steam is 0.546, then the steam is initially ____________
- wet
- dry saturated
- superheated
- none of the mentioned
Q6 | A stage, in reaction turbine, is represented by ____________
- each row of blades
- number of entries of steam
- number of exits of steam
- none of the mentioned
Q7 | Steam turbines may be classified according to ____________
- number of stages
- direction of steam flow
- mode of steam action
- all of the mentioned
Q8 | A steam nozzle converts ____________
- heat energy of steam into kinetic energy
- kinetic energy of steam into heat energy
- potential energy into heat energy
- none of the mentioned
Q9 | A steam turbine with no nozzle is?
- reaction turbine
- impulse turbine
- reaction & impulse turbines
- none of the mentioned
Q10 | _______ of electricity in United States is produced using steam turbine.
- 88%
- 50%
- 100%
- 77%
Q11 | When steam pressure ________ it becomes superficial fluid.
- decreases
- increases
- steam can not become superficial fluid
- none of the mentioned
Q12 | Steam turbines used in nuclear reactors use __________
- superficial fluids
- high pressure steam
- specific heat
- none of the mentioned
Q13 | Superficial steam power plants operate at _____ temperatures.
- high
- low
- constant
- none of the mentioned
Q14 | Energy efficiency of superficial steam is _________
- low
- high
- same as other steams
- none of the mentioned
Q15 | Superficial steam turbines can be operated at ________
- medium speeds
- low speeds
- high speeds
- none of the mentioned
Q16 | Superficial steam turbines releases _______ CO2.
- high
- low
- does not release
- none of the mentioned
Q17 | Which statement about reaction turbine is false?
- steam does not expand in nozzle
- blades acts like nozzles
- steam expands as flows over the rotor blades
- steam continuously losses its heat as flows over the rotor blades
Q18 | Reaction turbines are characterized by ___________
- relatively low rpm and steam expension over nozzle
- relatively high rpm and steam expension over nozzle
- relatively low rpm and steam expension over rotor blades
- relatively high rpm and steam expansion over rotor blades
Q19 | In condensing turbine what is the back pressure of the turbine?
- very high
- above atmospheric pressure
- equal to atmospheric pressure
- below atmospheric pressure
Q20 | Having two separate units for process heat and power is?
- useful
- useless
- pollution reducing
- none of the mentioned
Q21 | Back pressure turbine is placed between ____________
- turbine & pump
- boiler & pump
- turbine & heat exchanger
- boiler & turbine
Q22 | Addition of an infinitesimal amount of heat at the highest temperature is because ___________
- to initiate reheating
- to initiate regeneration
- to initiate superheating
- none of the mentioned
Q23 | High moisture content is involved during expansion of steam because ___________
- to ensure uniform heating
- to ensure uniform cooling
- to obtain a higher temperature of heat addition
- to obtain a lower temperature of heat addition
Q24 | What is the relation of the mean temperature of heat addition and cycle efficiency?
- both are inversely proportional
- both are directly proportional
- both are independent of each other
- none of the mentioned
Q25 | Temperature of heat rejection in a condenser can be lowered by using?
- lubricant
- oil
- refrigerant
- diesel