Chemical Engineering
Radha Ganji asked • 3 minutes agoAir initially at 101. 3 kPa and 40oC and with a relative humidity of 50%, is cooled at constant pressure to 30oC. The cooled air has a- a)higher dew point.
- b)higher absolute (specific) humidity.
- c)higher relative humidity
- d)higher wet bulb temperature.
Correct answer is option 'C'. Can you explain this answer?
Air initially at 101. 3 kPa and 40oC and with a relative humidity of 50%, is cooled at constant pressure to 30oC. The cooled air has a
a)
higher dew point.
b)
higher absolute (specific) humidity.
c)
higher relative humidity
d)
higher wet bulb temperature.
Find the most common example for absorption.- a)Ammonia and air in solvent water
- b)Ammonia and Carbon dioxide in solvent water
- c)Methane and air in solvent water
- d)Methane and Carbon dioxide in solvent water
Correct answer is option 'A'. Can you explain this answer?
Find the most common example for absorption.
a)
Ammonia and air in solvent water
b)
Ammonia and Carbon dioxide in solvent water
c)
Methane and air in solvent water
d)
Methane and Carbon dioxide in solvent water
AMOGH C answered • Sep 11, 2020Explanation: Since air won’t dissolve in water the affinity of nitrogen towards the water will be more which converts ammonia into ammonium solution. But in other options the hydrocarbons easily dissolves in polar solvents.
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient- a)increases
- b)decreases
- c)is not affected
- d)may increase or decrease; depends on the feed
Correct answer is option 'B'. Can you explain this answer?
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient
a)
increases
b)
decreases
c)
is not affected
d)
may increase or decrease; depends on the feed
Rampravesh Yadav answered • Aug 30, 2020B).because there create many resistance with level high.and temperature distribution will not be perfect.
The progressive warming up of the earth's surface is mainly due to the- a)automobile exhaust.
- b)blanketing effect of CO2 in the atmosphere.
- c)de-forestation.
- d)thickening of ozone layer.
Correct answer is option 'B'. Can you explain this answer?
The progressive warming up of the earth's surface is mainly due to the
a)
automobile exhaust.
b)
blanketing effect of CO2 in the atmosphere.
c)
de-forestation.
d)
thickening of ozone layer.
ARJUN SINGH answered • Aug 29, 2020CO2 goes in the atmosphere and make a thick layer, this layer allowes the light to enter into the atmosphere but do not allow it to exit, the heat get trapped into the atmosphere and leads to the warming up of the surface.
What is the molecular weight of ammonia?- a)31
- b)53
- c)29
- d)39
Correct answer is option 'C'. Can you explain this answer?
What is the molecular weight of ammonia?
a)
31
b)
53
c)
29
d)
39
Google Class Room Rng answered • Jul 10, 2020Molecular weight of ammonia 17
Christine Joy asked • 11 hours agoEstimate the feed rate, if the composition of the more volatile component in the feed is 50% and the residue is 10% and the equilibrium relation is given by y*= 1.975x. Also the rate of residue is 60 mol/hr.- a)213 mol/hr
- b)313 mol/hr
- c)413 mol/hr
- d)513 mol/hr
Correct answer is option 'B'. Can you explain this answer?
Estimate the feed rate, if the composition of the more volatile component in the feed is 50% and the residue is 10% and the equilibrium relation is given by y*= 1.975x. Also the rate of residue is 60 mol/hr.
a)
213 mol/hr
b)
313 mol/hr
c)
413 mol/hr
d)
513 mol/hr
Karan Gohil asked • yesterdayThe thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are- a)(COP)R = (COP)HP = 0.6
- b)(COP)R = 2.5; (COP)HP = 1.5
- c)(COP)R = 1.5; (COP)HP = 2.5
- d)(COP)R = (COP)HP = 2.5
Correct answer is option 'C'. Can you explain this answer?
The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
a)
(COP)R = (COP)HP = 0.6
b)
(COP)R = 2.5; (COP)HP = 1.5
c)
(COP)R = 1.5; (COP)HP = 2.5
d)
(COP)R = (COP)HP = 2.5
Sandeep Agrawal asked • 2 days agoPick out the wrong statement.- a)Orifice baffles are never used in a shell and tube heat exchanger.
- b)Pressure drop on the shell side of a heat exchanger depends upon tube pitch also.
- c)In a horizontal tube evaporator, surface blanketing by air is avoided.
- d)Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers.
Correct answer is option 'A'. Can you explain this answer?
Pick out the wrong statement.
a)
Orifice baffles are never used in a shell and tube heat exchanger.
b)
Pressure drop on the shell side of a heat exchanger depends upon tube pitch also.
c)
In a horizontal tube evaporator, surface blanketing by air is avoided.
d)
Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers.
Radha Ganji asked • 2 days agoOverall efficiency of the distillation column is- a)the ratio of number of ideal plates to actual plates.
- b)the ratio of number of actual plates to ideal plates.
- c)same as the Murphree efficiency.
- d)always more than the point efficiency.
Correct answer is option 'A'. Can you explain this answer?
Overall efficiency of the distillation column is
a)
the ratio of number of ideal plates to actual plates.
b)
the ratio of number of actual plates to ideal plates.
c)
same as the Murphree efficiency.
d)
always more than the point efficiency.
Manish Swaraj asked • 3 days agoRelative humidity is the ratio of the- a)partial pressure of the vapour to the vapour pressure of the liquid at room temperature.
- b)partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
- c)actual humidity to saturation humidity.
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
Relative humidity is the ratio of the
a)
partial pressure of the vapour to the vapour pressure of the liquid at room temperature.
b)
partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
c)
actual humidity to saturation humidity.
d)
none of these
Giridharan Ts asked • 4 days agoA radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body- a)697.2 W/m2
- b)786.9 W/m2
- c)324.7 W/m2
- d)592.1 W/m2
Correct answer is option 'A'. Can you explain this answer?
A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body
a)
697.2 W/m2
b)
786.9 W/m2
c)
324.7 W/m2
d)
592.1 W/m2
Radha Ganji asked • 4 days agoA process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95�C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is- a)counter flow with process stream on shell side.
- b)counter flow with process stream on tube side.
- c)parallel flow with process stream on shell side.
- d)parallel flow with process stream on tube side.
Correct answer is option 'A'. Can you explain this answer?
A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95�C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is
a)
counter flow with process stream on shell side.
b)
counter flow with process stream on tube side.
c)
parallel flow with process stream on shell side.
d)
parallel flow with process stream on tube side.
Shamaim Malik asked • 6 days agoIn the equation Q = UAΔt; Δt is- a)geometric mean temperature difference.
- b)arithmetic mean temperature difference.
- c)logarithmic mean temperature difference.
- d)the difference of average bulk temperatures of hot and cold fluids.
Correct answer is option 'C'. Can you explain this answer?
In the equation Q = UAΔt; Δt is
a)
geometric mean temperature difference.
b)
arithmetic mean temperature difference.
c)
logarithmic mean temperature difference.
d)
the difference of average bulk temperatures of hot and cold fluids.
Shafi Shaik asked • 1 week agoCompound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is- a)25%
- b)50%
- c)70%
- d)90%
Correct answer is option 'B'. Can you explain this answer?
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is
a)
25%
b)
50%
c)
70%
d)
90%
Anshul Rasyotra asked • 2 weeks ago200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 x 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)- a)0.5
- b)0.05
- c)0.1
- d)0.15
Correct answer is option 'C'. Can you explain this answer?
200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 x 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)
a)
0.5
b)
0.05
c)
0.1
d)
0.15
Sanidhya Chandola asked • 2 weeks agoSuspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by- a)biological oxygen pond.
- b)radial settling tank (thickener) using coagulant (lime & ferrous sulphate).
- c)lagoons.
- d)filtration.
Correct answer is option 'B'. Can you explain this answer?
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
a)
biological oxygen pond.
b)
radial settling tank (thickener) using coagulant (lime & ferrous sulphate).
c)
lagoons.
d)
filtration.
Sabyasachi Mohapatra asked • 3 weeks agoWhat type of macrocycles are used in isolation of fullerenes?
Krish Jat asked • 4 weeks agoA forced circulation evaporator is to concentrate 50,000 kg/h of 40% KOH to
70% KOH using steam at 3 bar pressure. The feed temperature and the
condensing temperature are both at 45oC. The density of the feed solution is 1.5
gm/cm3. If the overall heat transfer coefficient is 2 kW/m2 oC, calculate the
following,
i. the steam requirement,
ii. the heat transfer area required. Related: Evaporators (Part - 1)?
Related: Evaporators (Part - 1)
PURNESH KUMRAWAT asked • 4 weeks agoConsider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of
- a)Temperature difference
- b)Energy difference
- c)Mass difference
- d)Volumetric difference
Correct answer is option 'A'. Can you explain this answer?
Consider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of
a)
Temperature difference
b)
Energy difference
c)
Mass difference
d)
Volumetric difference
SANGEETA BALDEV asked • 4 weeks agoThe diagram shows heat conduction through a plane wall. The surface temperature is 475 K and it radiates heat to the surroundings at 335 K. If thermal conductivity of the material is 12.5 W/m degree, find the temperature gradient. Let convective coefficient be 80 W/m2 degree and radiation factor is 0.9
- a)– 1052.4 degree celsius
- b)– 2052.4 degree celsius
- c)– 3052.4 degree celsius
- d)– 4052.4 degree celsius
Correct answer is option 'A'. Can you explain this answer?
The diagram shows heat conduction through a plane wall. The surface temperature is 475 K and it radiates heat to the surroundings at 335 K. If thermal conductivity of the material is 12.5 W/m degree, find the temperature gradient. Let convective coefficient be 80 W/m2 degree and radiation factor is 0.9
a)
– 1052.4 degree celsius
b)
– 2052.4 degree celsius
c)
– 3052.4 degree celsius
d)
– 4052.4 degree celsius
Ahmed Adel asked • 4 weeks agoRadiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission- a)155.47 W/m2
- b)145.47 W/m2
- c)135.47 W/m2
- d)125.47 W/m2
Correct answer is option 'B'. Can you explain this answer?
Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission
a)
155.47 W/m2
b)
145.47 W/m2
c)
135.47 W/m2
d)
125.47 W/m2
SHUBHAM SINGH asked • Sep 07, 2020For an air(A)-water vapour(B) mixture, the partial pressure of the air is 5 pa and the total pressure of the system is 15 pa. The absolute humidity in mass of air/mass of water vapour is- a)0.805
- b)0.311
- c)0.705
- d)0.411
Correct answer is option 'A'. Can you explain this answer?
For an air(A)-water vapour(B) mixture, the partial pressure of the air is 5 pa and the total pressure of the system is 15 pa. The absolute humidity in mass of air/mass of water vapour is
a)
0.805
b)
0.311
c)
0.705
d)
0.411
SRISHTI GARG asked • Jul 16, 2020A condenser is to be designed to condense 225.0 kg of steam per hour at a pressure of 0.15 bar. A square array of 400 tubes, each of 6 mm in diameter, is available for the task. If the tube surface temperature is to be maintained at 26 degree Celsius, make calculations for the length of the tube- a)4.353 m
- b)3.353 m
- c)2.353 m
- d)1.353 m
Correct answer is option 'D'. Can you explain this answer?
A condenser is to be designed to condense 225.0 kg of steam per hour at a pressure of 0.15 bar. A square array of 400 tubes, each of 6 mm in diameter, is available for the task. If the tube surface temperature is to be maintained at 26 degree Celsius, make calculations for the length of the tube
a)
4.353 m
b)
3.353 m
c)
2.353 m
d)
1.353 m
CHETNA PURAN asked • Jul 16, 2020A 0.10 cm diameter and 15 cm long wire has been laid horizontally and submerged in water at atmospheric pressure. The wire has a steady state voltage drop of 14.5 V and a current of 42.5 A. Determine the heat flux of the wire.
The following equation applies for water boiling on a horizontal submerged surface
H = 1.54 (Q/A) 0.75 = 5.58 (d t) 3 W/m2 K where Q/A is the heat flux rate in W/m2 and d t is the temperature difference between surface and saturation- a)1.308 * 10 8 W/m2
- b)1.308 * 10 7 W/m2
- c)1.308 * 10 6 W/m2
- d)1.308 * 10 5 W/m2
Correct answer is option 'C'. Can you explain this answer?
A 0.10 cm diameter and 15 cm long wire has been laid horizontally and submerged in water at atmospheric pressure. The wire has a steady state voltage drop of 14.5 V and a current of 42.5 A. Determine the heat flux of the wire.
The following equation applies for water boiling on a horizontal submerged surface
H = 1.54 (Q/A) 0.75 = 5.58 (d t) 3 W/m2 K where Q/A is the heat flux rate in W/m2 and d t is the temperature difference between surface and saturation
The following equation applies for water boiling on a horizontal submerged surface
H = 1.54 (Q/A) 0.75 = 5.58 (d t) 3 W/m2 K where Q/A is the heat flux rate in W/m2 and d t is the temperature difference between surface and saturation
a)
1.308 * 10 8 W/m2
b)
1.308 * 10 7 W/m2
c)
1.308 * 10 6 W/m2
d)
1.308 * 10 5 W/m2
Rana Rohan asked • Jul 16, 2020In Joule`s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is- a)40.5
- b)34.4
- c)26.8
- d)25
Correct answer is option `B`. Can you explain this answer?
In Joule`s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is
a)
40.5
b)
34.4
c)
26.8
d)
25
AMOGH C asked • Jun 20, 2020The mass flow rate of a component in a mixture in X-direction is 2kg/s. The area vector at a particular cross-section is (1.1, 3.2, 5.4) cm2. Calculate the value of flux (kg/cm2.s) through the cross-section. - a)0.31
- b)2.2
- c)1.82
- d)6.45
Correct answer is option 'C'. Can you explain this answer?
The mass flow rate of a component in a mixture in X-direction is 2kg/s. The area vector at a particular cross-section is (1.1, 3.2, 5.4) cm2. Calculate the value of flux (kg/cm2.s) through the cross-section.
a)
0.31
b)
2.2
c)
1.82
d)
6.45
SHAKTI KUMAR asked • Jun 20, 2020A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 5 N/m2, find overall mass density - a)4.156 kg/m3
- b)3.156 kg/m3
- c)2.156 kg/m3
- d)1.156 kg/m3
Correct answer is option 'D'. Can you explain this answer?
A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 5 N/m2, find overall mass density
a)
4.156 kg/m3
b)
3.156 kg/m3
c)
2.156 kg/m3
d)
1.156 kg/m3
JOSHI KAUSTUBH asked • Jun 14, 2020Some examples of heat exchanger are
(i) Condensers and evaporators in refrigeration units
(ii) Evaporator of an ice plant and milk chiller of a pasteurizing plant
(iii) Automobile radiators and oil coolers of heat engines
Identify the correct answer- a)1 only
- b)2 and 3
- c)1, 2 and 3
- d)1 and 2
Correct answer is option 'C'. Can you explain this answer?
Some examples of heat exchanger are
(i) Condensers and evaporators in refrigeration units
(ii) Evaporator of an ice plant and milk chiller of a pasteurizing plant
(iii) Automobile radiators and oil coolers of heat engines
Identify the correct answer
(i) Condensers and evaporators in refrigeration units
(ii) Evaporator of an ice plant and milk chiller of a pasteurizing plant
(iii) Automobile radiators and oil coolers of heat engines
Identify the correct answer
a)
1 only
b)
2 and 3
c)
1, 2 and 3
d)
1 and 2
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