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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