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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