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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1801. |
Free expansion of gas with frictionless piston is an example which process?(a) Reversible(b) Irreversible(c) Cannot say(d) None of the mentioned |
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Answer» Correct answer is (a) Reversible Explanation: Free expansion of gas is reversible process. |
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| 1802. |
What is the final enthalpy of the solution made by mixing 5 grams of solution A having enthalpy 20 J with 15 grams of solution B having enthalpy 40 J?(a) 10 J(b) 20 J(c) 25 J(d) 35 J |
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Answer» The correct answer is (d) 35 J Explanation: Final enthalpy = 0.25*20 + 0.75*40 = 5 + 30 = 35 J. |
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| 1803. |
What is the final enthalpy of the solution made by mixing 20 grams of solution A having enthalpy 5 J with 5 grams of solution B having enthalpy 10 J?(a) 2 J(b) 4 J(c) 6 J(d) 7 J |
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Answer» The correct answer is (c) 6 J To explain I would say: Final enthalpy = 0.8*5 + 0.2*10 = 4 + 2 = 6 J. |
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| 1804. |
What is the final enthalpy of the solution made by mixing 100 grams of 10% NaOH having enthalpy 40 J with 300 grams of 90% NaOH having enthalpy 20 J?(a) 10 J(b) 15 J(c) 25 J(d) 40 J |
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Answer» Correct answer is (c) 25 J The explanation is: Final enthalpy = 0.25*40 + 0.75*20 = 10 + 15 = 25 J. |
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| 1805. |
What is the relative saturation of a gas with partial pressure 38 mm Hg and vapor pressure 1 torr?(a) 0.05(b) 0.5(c) 2(d) 38 |
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Answer» Correct option is (d) 38 The best I can explain: 1 torr = 1 mm Hg, => relative saturation = 38/1 = 38. |
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| 1806. |
What is the final enthalpy of the solution made by mixing 10 grams of solution A having enthalpy 10 J with 40 grams of solution B having enthalpy 30 J?(a) 14 J(b) 18 J(c) 22 J(d) 26 J |
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Answer» Correct option is (d) 26 J Easiest explanation: Final enthalpy = 0.2*10 + 0.8*30 = 26 J. |
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| 1807. |
Free expansion of gas against piston having friction is an example of which process?(a) Reversible(b) Irreversible(c) Cannot say(d) None of the mentioned |
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Answer» Right choice is (b) Irreversible Best explanation: Free expansion of gas against piston having friction is irreversible process. |
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| 1808. |
Which of the following is defined as the ratio of partial pressure and vapor pressure?(a) Relative Humidity(b) Molal Humidity(c) Humidity(d) None of the mentioned |
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Answer» Correct answer is (a) Relative Humidity For explanation I would say: Partial pressure divided by vapor pressure is called relative humidity. |
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| 1809. |
Which of the following is not found in process simulators?(a) Heat exchangers(b) Compressors(c) Splitters(d) None of the mentioned |
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Answer» Right answer is (d) None of the mentioned To elaborate: Heat exchangers, Compressors, Splitters all are found in process simulators. |
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| 1810. |
What does the interconnections between the unit modules represent?(a) Information flow(b) Material flow(c) Energy flow(d) All of the mentioned |
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Answer» Correct option is (d) All of the mentioned For explanation I would say: The interconnections between the unit modules represents all of the options. |
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| 1811. |
What is the relative saturation of a gas with partial pressure 10 mm Hg and vapor pressure 5 mm Hg?(a) 0.5(b) 1(c) 2(d) 4 |
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Answer» The correct answer is (c) 2 To explain I would say: Relative saturation = 10/5 = 2. |
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| 1812. |
Mixing of dissimilar substances is an example of which process?(a) Reversible(b) Irreversible(c) Cannot say(d) None of the mentioned |
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Answer» Right answer is (b) Irreversible Explanation: Mixing of dissimilar substances is an irreversible process. |
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| 1813. |
For solving a process simulation which of the following is required?(a) Material balances(b) Equilibrium relations(c) Energy balances(d) All of the mentioned |
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Answer» Correct option is (d) All of the mentioned To explain I would say: All the options are required for solving process simulator. |
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| 1814. |
Change in phase is an example of which process?(a) Reversible(b) Irreversible(c) Cannot say(d) None of the mentioned |
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Answer» Right option is (b) Irreversible The best explanation: Change in phase is an irreversible process. |
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| 1815. |
What is the enthalpy of a reaction, if the standard heat of formation of a compound is 10 J and sensible heat of the compound is 5 J?(a) 0(b) 5 J(c) 10 J(d) 15 J |
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Answer» Correct choice is (d) 15 J For explanation: Enthalpy of reaction = 10 + 5 = 15 J. |
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| 1816. |
What is the point of saturation of a condensable vapor?(a) Bubble point(b) Boiling point(c) Triple point(d) Dew point |
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Answer» Correct answer is (d) Dew point To explain I would say: Condensation of gas starts at its dew point. |
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| 1817. |
What is the enthalpy of a reaction, if the standard heat of formation of a compound is 15 J and sensible heat of the compound is 25 J?(a) 15 J(b) 25 J(c) 40 J(d) 50 J |
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Answer» The correct answer is (c) 40 J To elaborate: Enthalpy of reaction = 15 + 25 = 40 J. |
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| 1818. |
Which of the following is heat required in phase transitions?(a) Latent Heat(b) Sensible Heat(c) Depends on type of phase transition(d) None of the mentioned |
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Answer» Right choice is (a) Latent Heat The explanation: Heat required for phase transitions is latent heat. |
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| 1819. |
What is the enthalpy of a reaction, if the standard heat of formation of a compound is 15 J, sensible heat of the compound is 25 J, and latent heat of the compound is 10 J?(a) 25 J(b) 40 J(c) 50 J(d) 65 J |
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Answer» Correct answer is (c) 50 J To explain I would say: Enthalpy of reaction = 15 + 25 + 10 = 50 J. |
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| 1820. |
0.2 mole glucose reacts completely with excess air, if 5 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 40%(b) 80%(c) 120%(d) 160% |
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Answer» Correct choice is (c) 120% Easiest explanation: Moles of bone dry air = 1, moles of H2O produced = 1.2, => humidity = 1.2/1*100 = 120%. |
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| 1821. |
What is the latent heat for melting?(a) Heat of vaporization(b) Heat of fusion(c) Heat of Solidification(d) None of the mentioned |
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Answer» Right answer is (b) Heat of fusion The best explanation: Latent heat for melting is called heat of vaporization. |
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| 1822. |
Which of the following is not a way of condensation of vapor?(a) Cooling at constant volume(b) Cooling at constant pressure(c) Compress it isothermally(d) Compress it |
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Answer» Correct choice is (d) Compress it Explanation: Compressing a gas and its temperature is increasing does not condense the vapor, compressing vapor at constant temperature is a way of condensation. |
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| 1823. |
50 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 25 atm, what is the humidity?(a) 20%(b) 80%(c) 200%(d) 400% |
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Answer» Correct choice is (d) 400% Easiest explanation: Moles of bone dry air = 25, moles of H2O produced = 100, => humidity = 100/25*100 = 400%. |
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| 1824. |
25 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 10%(b) 100%(c) 500%(d) 1000% |
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Answer» Right choice is (d) 1000% For explanation: Moles of bone dry air = 5, moles of H2O produced = 50, => humidity = 50/5*100 = 1000%. |
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| 1825. |
0.1 mole of CH4 reacts completely with excess air, if 1 liter of bone dry air is produced at 27^oC and 25 atm, what is the humidity?(a) 4%(b) 15%(c) 20%(d) 52% |
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Answer» Right choice is (c) 20% The explanation: Moles of bone dry air = 1, moles of H2O produced = 0.2, => humidity = 0.2/1*100 = 20%. |
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| 1826. |
15 J is the latent heat for melting of ice, what is the heat of transition from 0^oC ice to 15^oC water if heat of transition from 0^oC water to 15^oC water is 10 J?(a) 10 J(b) 15 J(c) 25 J(d) 40 J |
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Answer» The correct option is (c) 25 J To explain: H = 15 + 10 = 25 J. |
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| 1827. |
What happens to water in the humidification process?(a) Evaporates(b) Freezes(c) Saturated(d) None of the mentioned |
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Answer» Correct option is (a) Evaporates To explain: Water evaporates during the humidification process. |
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| 1828. |
What is the heat transferred from the system in the humidification process?(a) Positive(b) Negative(c) Zero(d) None of the mentioned |
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Answer» Right answer is (c) Zero Explanation: Humidification is the adiabatic cooling process which means no heat exchange. |
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| 1829. |
Humidification of air is known as (a) Decrease in moisture content of air (b) Increase in moisture content of air (c) No change in moisture content of air (d) None of the above |
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Answer» (b) Increase in moisture content of air Humidification of air is known as Increase in moisture content of air. |
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| 1830. |
In condensation, moist air is cooled below its which temperature?(a) Dew-point temperature(b) Dry-bulb temperature(c) Wet-bulb temperature(d) Saturation temperature |
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Answer» The correct option is (d) Saturation temperature The explanation is: In condensation, moist air is cooled below its saturation temperature. |
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| 1831. |
Cp of ice is 10 J/^oC and that of water is 15 J/^oC, what is the enthalpy change of water from – 15^oC to 0^oC at standard conditions, if the later heat of fusion of water is 110 J?(a) 150 J(b) 315 J(c) 485 J(d) 560 J |
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Answer» The correct choice is (c) 485 J The explanation: ∆H = -15∫^025.dT + 110 = 25*15 + 110 = 485 J. |
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| 1832. |
Cp of ice is 25 J/^oC and that of water is 30 J/^oC, what is the enthalpy change of water from – 10^oC to 35^oC at standard conditions, if the later heat of fusion of water is 110 J?(a) 250 J(b) 595 J(c) 960 J(d) 1410 J |
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Answer» The correct answer is (d) 1410 J To explain I would say: ∆H = -10∫^025.dT + 110 + 0∫^3530.dT = 25*10 + 110 + 35*30 = 1410 J. |
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| 1833. |
1 mole of CH4 reacts completely with excess air, if 5 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 25%(b) 50%(c) 100%(d) 200% |
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Answer» Right choice is (d) 200% The explanation: Moles of bone dry air = 1, moles of H2O produced = 2, => humidity = 2/1*100 = 200%. |
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| 1834. |
What is the work of the humidification process?(a) Vaporization(b) Freezing(c) Condensing(d) None of the mentioned |
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Answer» Right choice is (a) Vaporization Easiest explanation: Humidification vaporizes liquid water to moist air. |
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| 1835. |
150 J is the latent heat for vaporization of water, what is the heat of transition from 50^oC water to 100^oC steam if heat of transition from 50^oC water to 100^oC water is 12 J?(a) 12 J(b) 152 J(c) 162 J(d) 200 J |
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Answer» Correct option is (c) 162 J For explanation I would say: H = 150 + 12 = 162 J. |
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| 1836. |
If Cp of liquid water is 10 J/^oC, what is the enthalpy change of water at standard conditions from – 10^oC to 0^oC?(a) 10 J(b) 50 J(c) 100 J(d) Cannot be determined |
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Answer» Right option is (d) Cannot be determined Easiest explanation: Since the phase of water from – 10^oC to 0^oC is solid ice, but Cp of liquid water is given, so it cannot be determined. |
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| 1837. |
If Cp of solid benzene is 10 J/^oC, what is the enthalpy change of water from 5^oC to 75^oC?(a) 5 J(b) 10 J(c) 75 J(d) 700 J |
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Answer» Right choice is (d) 700 J To explain: ∆H = 5∫^7510.dT = 700 J. |
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| 1838. |
If Cp of liquid benzene is 15 J/^oC, what is the enthalpy change of water from 5^oC to 10^oC?(a) 15 J(b) 50 J(c) 75 J(d) 90 J |
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Answer» Correct option is (c) 75 J The explanation is: ∆H = 5∫^1015.dT = 75 J. |
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| 1839. |
What is the work of drying process?(a) Decreases the moisture content(b) Vaporizes water(c) Increases the moisture content(d) None of the mentioned |
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Answer» Right answer is (a) Decreases the moisture content Explanation: Drying decreases the moisture content of air. |
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| 1840. |
Heat of fusion of benzene is 10 J at 0^oC, if Cp of solid benzene is 10 J/^oC, and that of liquid benzene is 5 J/^oC what is the enthalpy change of benzene from – 10^oC to 10^oC?(a) 160 J(b) 200 J(c) 240 J(d) 300 J |
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Answer» Correct option is (a) 160 J Best explanation: ∆H = -10∫^010.dT + 10 + 0∫^105.dT = 10*10 + 10 + 5*10 = 160 J. |
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| 1841. |
A reaction has produced 1.5 moles of water and 2 liter of bone dry air at 27^oC and 25 atm, what is the humidity?(a) 5%(b) 25%(c) 50%(d) 75% |
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Answer» Correct answer is (d) 75% The best I can explain: Moles of bone dry air = 2, => Humidity = 1.5/2*100 = 75%. |
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| 1842. |
A reaction has produced 45 moles of water and 25 liter of bone dry air at 27^oC and 25 atm, what is the humidity?(a) 25%(b) 104%(c) 180%(d) 209% |
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Answer» Correct choice is (c) 180% Easy explanation: Moles of bone dry air = 25, => Humidity = 45/25*100 = 180%. |
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| 1843. |
What is the humidity if the moles of dry gas is 25 and mole of water vapor are 15?(a) 60%(b) 90%(c) 150%(d) 200% |
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Answer» Correct answer is (a) 60% Explanation: Humidity = 15/25*100 = 60%. |
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| 1844. |
A reaction has produced 0.4 mole of water vapor and 1 liter of bone dry air at 27oC and 5 atm, what is the humidity?(a) 85%(b) 143%(c) 178%(d) 200% |
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Answer» Right option is (d) 200% To explain: Moles of bone dry air = 0.2, => Humidity = 0.4/0.2*100 = 200%. |
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| 1845. |
What is the enthalpy change of 30^oC system if the heat capacity of air at 38^oC is 5 J/^oC and heat capacity of water vapor at 38^oC is 10 J/^oC, enthalpy of vaporization is 10 J, and the humidity is 60%?(a) 14 J(b) 39 J(c) 65 J(d) 94 J |
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Answer» Right answer is (d) 94 J Explanation: ∆H = 5(38 – 30) + 0.6*[10(38 – 30) + 10] = 40 + 54 = 94 J. |
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| 1846. |
A reaction has produced 1 mole of water vapor and 5 liter of bone dry air at 27^oC and 5 atm, what is the humidity?(a) 100%(b) 104%(c) 115%(d) 169% |
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Answer» Right option is (a) 100% For explanation: Moles of bone dry air = 1, => Humidity = 1/1*100 = 100%. |
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| 1847. |
2 Kg of water (CP = 0.15 J/Kg^oC) is pumped to a height of 0.1 m, work done by the motor is 10 J/Kg, and heat liberated by it is 5 J/Kg, what is the final temperature of water if the initial temperature was 27^oC?(a) 10^oC(b) 19^oC(c) 27^oC(d) 37^oC |
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Answer» Right option is (d) 37^oC The best I can explain: ∆U = Q + W – m (∆H + ∆PE + ∆KE), => 0 = – 5 + 10 – 2(∆H + 10*0.1), => ∆H = 1.5 J/Kg, => 1.5 = 0.15(T – 27), => T = 37^oC. |
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| 1848. |
A reaction has produced 5 moles of water vapor and 10 liter bone dry air at 27^oC and 15 atm, what is the humidity?(a) 24%(b) 49%(c) 83%(d) 106% |
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Answer» Right answer is (c) 83% For explanation I would say: Moles of bone dry air = 6, => humidity = 5/6*100 = 83%. |
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| 1849. |
What are moles of dry gas if the moles of water vapor is 14 at 25% humidity?(a) 3.5(b) 7(c) 14(d) 56 |
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Answer» Right choice is (d) 56 The explanation is: Moles of dry gas = 14/0.25 = 56. |
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| 1850. |
1 Kg of water (CP = 0.5 J/Kg^oC) is pumped to a height of 0.5 m, work done by the motor is 40 J/Kg, and heat liberated by it is 10 J/Kg, what is the final temperature of water if the initial temperature was 10^oC?(a) 10^oC(b) 30^oC(c) 40^oC(d) 60^oC |
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Answer» Correct choice is (d) 60^oC The explanation: ∆U = Q + W – m (∆H + ∆PE + ∆KE), => 0 = – 10 + 40 – 1*(∆H + 10*0.4), => ∆H = 25 J/Kg, => 25 = 0.5(T – 10), => T = 60^oC. |
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