Steam Condenser and Cooling Towers

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This set of Thermal Engineering 1 Multiple Choice Questions & Answers (MCQs) focuses on Steam Condenser and Cooling Towers

Q1 | The function of a condenser in a thermal power plant is.......
  • To act as reservior to receive steam for turbine
  • To condense steam into condensate to be reused again
  • To create vaccum
  • All of the above
Q2 | A condenser where circulating water flows through tubes which are surrounded by steam,is known as.........
  • Surface condenser
  • Jet condenser
  • Barometric condenser
  • Evaporative condenser
Q3 | The vaccum obtainable in a condenser is dependent upon......
  • Capacity of ejector
  • Quantity of steam to be handeled
  • Types of condenser used
  • Temperature of cooling water
Q4 | The ratio of actual vaccum to the ideal vaccum in a condenser is called.......
  • Condenser efficiency
  • Vaccum efficiency
  • Boiler efficiency
  • Nozzle efficiency
Q5 | A condenser in a steam power plant is .......
  • Increases expansion ratio of steam
  • Reduces back pressure of steam
  • Reduces temperature of exhaust steam
  • All of the above
Q6 | The actual vaccum in a condenser is equal to......
  • Barometric pressure + actual pressure
  • Barometric pressure - actual pressure
  • Gauge pressure + atmospheric pressure
  • Gauge pressure - atmospheric pressure
Q7 | According to Dalton’s law, the total pressure of the mixture of gases is equal to
  • greater of the partial pressures of all
  • average of the partial pressures of all
  • sum of the partial pressures of all
  • sum of the partial pressures of all divided by average molecular weight
Q8 | At ideal condition of vapour power cycle, reversible constant pressure heat rejection is carried out at
  • boiler
  • turbine
  • condenser
  • feed pump
Q9 | A condenser condenses the steam coming out from___________.
  • Boiler
  • Turbine
  • Economiser
  • Super heater
Q10 | What is use of the air pumps in the condenser?
  • Remove water
  • Air leaking in the condenser and to maintain the vacuum.
  • Maintain atmospheric pressure and the condenser.
  • Both (a) & (b).
Q11 | What is the correct formula for net work done of reciprocating engine?
  • Wnet = mean effective pressure × clearance volume
  • Wnet = mean effective pressure × total volume of cylinder
  • Wnet = mean effective pressure × displacement volume
  • none of the above
Q12 | Minimum work in compressor is possible when the value of adiabatic index n is equal to
  • 0.75
  • 1
  • 1.27
  • 1.35
Q13 | Compressed air coming out from a punctured football
  • becomes hotter
  • becomes cooler
  • remains at the same temperature
  • may become hotter or cooler depending upon the humidity of the surrounding air
Q14 | The capacity of a compressor is 5 m /min. 5 m /min refers to
  • standard air
  • free air
  • compressed air
  • compressed air at delivery pressure
Q15 | The overall isothermal efficiency of compressor is defined as the ratio of
  • isothermal h.p. to the BHP of motor
  • isothermal h.p. to adiabatic h.p.
  • power to drive compressor to isothermal h.p.
  • work to compress air isothermally to work for actual compression
Q16 | The- most efficient method of compressing air is to compress it
  • isothermally
  • adiabatically
  • isentropically
  • isochronically
Q17 | Maximum work is done in compressing air when the compression is
  • isothermal
  • adiabatic
  • polytropic
  • any one of the above
Q18 | The pressure and temperature conditions of air at the suction of compressor are
  • pressure sightly less than atmospheric and temperature slightly more than atmospheric.
  • slightly more than atmospheric
  • slightly less than atmospheric
  • pressure slightly more than atmospheric and temperature slightly less than atmospheric
Q19 | Isothermal compression effeicency can be attained by running the compressor
  • at very high speed
  • at very slow speed
  • at average speed
  • at zero speed
Q20 | The compressor capacity with decrease in suction temperature
  • increases
  • decreases
  • remains unaffected
  • may increase or decrease depending on compressor capacity
Q21 | Isothermal compression efficiency, even when running at high speed, can be approached by using
  • multi-stage compression
  • cold water spray
  • both (a) and (b) above
  • fully insulating the cylinder
Q22 | Compression efficiency is compared against
  • ideal compression
  • adiabatic compression
  • isothermal compression
  • isentropic compression
Q23 | Aeroplanes employ following type of compressor
  • radial flow
  • axial flow
  • centrifugal
  • combination of above
Q24 | Inter cooling in compressors
  • cools the delivered air
  • results in saving of power in compressing a given volume to given pressure
  • is the standard practice for big compressors
  • enables compression in two stages
Q25 | An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes
  • one adiabatic, two isobaric, and one constant volume
  • two adiabatic and two isobaric
  • two adiabatic, one isobaric and one constant volume
  • one adiabatic, one isobaric and two constant volume