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This set of Thermal Engineering 1 Multiple Choice Questions & Answers (MCQs) focuses on Steam Prime-Movers
Q1 | For the flow through the convergent and divergent nozzle, whole of friction loss is assumed
- in the converging portion
- in the divergent portion
- between inlet and outlet
- none of the above
Q2 | The presence of friction in the nozzle
- increases the final dryness fraction of steam
- decreases the final dryness fraction of steam
- it does not affect the dryness fraction of steam
- none of the above
Q3 | When the back pressure of a nozzle is below the critical pressure, the nozzle is said to be
- under expanding flow
- over expanding flow
- choked flow
- none of the above
Q4 | Which ideal process is carried out at the turbine in vapour power cycle?
- reversible adiabatic compression
- reversible adiabatic expansion
- reversible constant pressure heat addition
- reversible constant pressure heat rejection
Q5 | The steam turbines is a
- rotary machine
- reciprocating machine
- rotodynamic machine
- none of the above
Q6 | From inlet to exit of steam nozzle, the pressure
- increases
- decreases
- remains constant
- none of the above
Q7 | From inlet to exit of moving blades in case of impulse turbine, the pressure
- increases
- decreases
- remains constant
- none of the above
Q8 | From inlet to exit of moving blades in case of a reaction turbine, the pressure
- increases
- decreases
- remains constant
- none of the above
Q9 | In an impulse turbine, steam expands
- in the nozzle only
- in the moving blades only
- in the fixed and moving blades
- none of the above
Q10 | In a reaction turbine, steam expands
- in the nozzle only
- in the moving blades only
- in the fixed and moving blades
- none of the above
Q11 | A simple impulse turbine consists of
- one set of nozzles and one set of moving blades
- two sets of nozzle and one set of moving blades
- one set each of fixed and moving blades
- none of the above
Q12 | In a velocity-compounded impulse steam turbine, steam expands in
- one set of nozzles only
- more than one set of nozzles
- fixed and moving blades
- none of the above
Q13 | In a pressure-compounded impulse steam turbine, steam expands in
- nozzles and fixed blades only
- moving blades only
- fixed and moving blades both
- none of the above
Q14 | In a pressure-compounded impulse steam turbine, pressure drop over each ring of moving blades
- remains constant
- is increasing
- is decreasing
- none of the above
Q15 | In a pressure-compounded impulse steam turbine, as compared to velocity compounding, the number of stages is
- less
- more
- same
- none of the above
Q16 | The condensation of steam in a condenser takes place at
- constant pressure
- constant temperature
- constant pressure and constant temperature
- none of the above
Q17 | During condensation process, the temperature of the condensing fluid
- remains constant
- decreases
- increases
- none of the above
Q18 | The function of a condenser in a steam power plant is
- to reduce back pressure
- to condense the exhaust steam
- to reduce specific volume of fluid
- all of the above
Q19 | In a high-level jet condenser, the condenser shell is installed at a height of
- more than 5.5 m
- more than 10.33 m
- less than 10.33 m
- none of the above
Q20 | The surface condensers are preferred in steam power plant, because
- they require less coolant
- condensate can be reused
- they are more efficient
- none of the above
Q21 | In evaporative condensers, the condensing of steam is achieved
- by rejecting heat to surrounding air
- by rejecting heat to coolant
- by evaporation of some coolant
- none of the above
Q22 | Dalton's law of partial pressure, applicable to condensers, states that
- Pa = Pabs + Psat
- Psat = Pabs + Pa
- Pabs = Pa+ Psat
- none of the above
Q23 | The absolute pressure in a condenser is given by
- Pabs = Patm + Pvacuum
- Pabs = Patm -Pvacuum
- Pabs = Pvacuum
- none of the above
Q24 | Air leakage into the condenser reduces
- turbine output
- cooling capacity
- life of condenser
- all of the above
Q25 | The vacuum maintained in a condenser depends on
- pressure of cooling water
- temperature of cooling water
- back pressure maintained in the condenser
- all of the above