### Steam Condenser and Cooling Towers

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
• isentropically
• isochronically
Q17 | Maximum work is done in compressing air when the compression is
• isothermal
• 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
• isothermal compression
• isentropic compression
Q23 | Aeroplanes employ following type of compressor