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Second law of thermodyna..



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Q1. In a cryogenic experiment you need to keep a container at -125?C although it gains 100 W due to heat transfer. What is the smallest motor you would need for a heat pump absorbing heat from the container and rejecting heat to the room at 20?C?

(a) 97.84 kW
(b) 98.84 kW
(c) 99.84 kW
(d) 95.84 kW

Q2. A cyclic machine, as shown below, receives 325 kJ from a 1000 K energy reservoir. It rejects 125 kJ to a 400 K energy reservoir and the cycle produces 200kJ of work as output. Is this cycle reversible, irreversible, or impossible?

(a) reversible
(b) irreversible
(c) impossible
(d) none of the mentioned

Q3. An air-conditioner provides 1 kg/s of air at 15?C cooled from outside atmospheric air at 35?C. Estimate the amount of power needed to operate the air-conditioner.

(a) 1.09 kW
(b) 1.19 kW
(c) 1.29 kW
(d) 1.39 kW

Q4. A heat pump is used to meet the heating requirements of a house and maintain it at 20?C. On a day when the outdoor air temperature drops to 2?C, the house is estimated to lose heat at a rate of 80,000 kJ/h. If the heat pump under these conditions has a COP of 2.5, determine the rate at which heat is absorbed from the cold outdoor air.

(a) 32000 kJ/h
(b) 48000 kJ/h
(c) 54000 kJ/h
(d) 72000 kJ/h

Q5. A heat pump is used to meet the heating requirements of a house and maintain it at 20?C. On a day when the outdoor air temperature drops to 2?C, the house is estimated to lose heat at a rate of 80,000 kJ/h. If the heat pump under these conditions has a COP of 2.5, determine the power consumed by the heat pump.

(a) 32000 kJ/h
(b) 33000 kJ/h
(c) 34000 kJ/h
(d) 35000 kJ/h

Q6. The food compartment of a refrigerator is maintained at 4?C by removing heat from it at a rate of 360 kJ/min. If the required power input to the refrigerator is 2kW, determine the rate of heat rejection to the room that houses the refrigerator.

(a) 450 kJ/min
(b) 460 kJ/min
(c) 470 kJ/min
(d) 480 kJ/min

Q7. The food compartment of a refrigerator is maintained at 4?C by removing heat from it at a rate of 360 kJ/min. If the required power input to the refrigerator is 2kW, determine the coefficient of performance of the refrigerator.

(a) 4
(b) 3
(c) 2
(d) 1

Q8. A car engine with a power output of 50 kW has a thermal efficiency of 24 percent. Determine the fuel consumption rate of this car if the fuel has a heating value of 44,000 kJ/kg .

(a) 0.00273 kg/s
(b) 0.00373 kg/s
(c) 0.00473 kg/s
(d) 0.00573 kg/s

Q9. Heat is transferred to a heat engine from a furnace at a rate of 80 MW. If the rate of waste heat rejection to a nearby river is 50 MW, determine the thermal efficiency for this heat engine.

(a) 47.5 %
(b) 27.5 %
(c) 37.5 %
(d) none of the mentioned

Q10. Heat is transferred to a heat engine from a furnace at a rate of 80 MW. If the rate of waste heat rejection to a nearby river is 50 MW, determine the net power output for this heat engine.

(a) 30 MW
(b) 40 MW
(c) 50 MW
(d) 60 MW


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416 views

A Well Stoppered Thermos Flask Contains Some Ice Cubes. This Is An Example Of A

Modified 237 Year Ago Bhavna

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237 Year Ago

A Well Stoppered Thermos Flask Contains Some Ice Cubes. This Is An Example Of A

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Three Moles Of An Ideal Gas Expanded Spontaneously Into Vacuum. The Work Done Will Be

Modified 5 Year Ago

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Three Moles Of An Ideal Gas Expanded Spontaneously Into Vacuum. The Work Done Will Be

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In Order To Decompose 9 G Water 142.5 KJ Heat Is Required. Hence, The Enthalpy Of Formation Of Water Is

Modified 5 Year Ago

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5 Year Ago

In Order To Decompose 9 G Water 142.5 KJ Heat Is Required. Hence, The Enthalpy Of Formation Of Water Is

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0 Answer
351 views

Changes In A System From An Initial State To The Final State Were Made By A Different Manner That ΔH Remains Same But Q Changes Because

Modified 237 Year Ago

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237 Year Ago

Changes In A System From An Initial State To The Final State Were Made By A Different Manner That ΔH Remains Same But Q Changes Because

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0 Answer
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If W Is The Amount Of Work Done By The System And Q Is The Amount Of Heat Supplied To The System. Identify The Type Of The System

Modified 237 Year Ago

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237 Year Ago

If W Is The Amount Of Work Done By The System And Q Is The Amount Of Heat Supplied To The System. Identify The Type Of The System

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0 Answer
334 views

The Entropy Change Involved In The Isothermal Reversible

Modified 314 Year Ago

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The Entropy Change Involved In The Isothermal Reversible

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304 views

Calculate The Amount Of Heat Evolved When 500 Cm^3 Of 0.1 M HCl Is Mixed With 200 Cm^3 Of 0.2 M NaOH.

Modified 5 Year Ago Bhuv

304
Bhuv
5 Year Ago

Calculate The Amount Of Heat Evolved When 500 Cm^3 Of 0.1 M HCl Is Mixed With 200 Cm^3 Of 0.2 M NaOH.

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