Steam Condenser and Cooling Towers MCQs

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