InterviewSolution
Saved Bookmarks
InterviewSolution
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.
| 51. |
What amount of 57 octane should be mixed with 3 liters of 63 octane to obtain 4 liters of 59 octane?(a) 1 liter(b) 2 liters(c) 2.5 liters(d) 4.5 litersThis question was posed to me in my homework.This intriguing question originated from Steady-State and Unsteady-State Systems topic in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» CORRECT option is (d) 4.5 liters The explanation: 59*1 = 63*X + 57*(1 – x), => x = 1/3, now 4 = (1/3)*3 + (2/3)*w, => w = 4.5 liters. |
|
| 52. |
In what ratio 57 octane and 63 octane should be mixed to obtain 59 octane?(a) 1:1(b) 2:1(c) 3:1(d) 4:1The question was asked by my college professor while I was bunking the class.This intriguing question originated from Steady-State and Unsteady-State Systems topic in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT CHOICE is (b) 2:1 Explanation: 59*1 = 63*x + 57*(1 – x), => x= 1/3, => 1 – x = 2/3, => ratio of 57 octane: 63 octane = 2/3:1/3 = 2:1. |
|
| 53. |
What is the final amount of fluid in the vessel if the system is in steady state?(a) Same as the initial amount(b) Twice the initial amount(c) Zero(d) None of the mentionedI got this question in my homework.My question is taken from Steady-State and Unsteady-State Systems topic in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right option is (a) Same as the INITIAL amount |
|
| 54. |
An unsteady-state system, with 6 liters as initial amount of water in the vessel, water flow in rate is 2 liters/ s and flow out rate is 4 liters/s, what will be the amount of water in the vessel after 1 second?(a) 2 liters(b) 4 liters(c) 6 liters(d) 8 litersI have been asked this question during an internship interview.Query is from Steady-State and Unsteady-State Systems in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct choice is (B) 4 liters |
|
| 55. |
An unsteady-state system, with 10 liters as initial amount of water in the vessel, water flow in rate is 8 liters/ s and flow out rate is 5 liters/s, what will be the amount of water in the vessel after 10 seconds?(a) 10 liters(b) 20 liters(c) 30 liters(d) 40 litersI have been asked this question during a job interview.The question is from Steady-State and Unsteady-State Systems topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct ANSWER is (d) 40 liters |
|
| 56. |
The rate flow in and flow out in an unsteady state process are now increased by 10 Kg/s, which will be the change in accumulation?(a) 0(b) 5 Kg/s(c) 10 Kg/s(d) 20 Kg/sThe question was asked in quiz.Enquiry is from Steady-State and Unsteady-State Systems topic in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right OPTION is (a) 0 |
|
| 57. |
A fluid enters a vessel at the rate of 10 liters/s, and leaves in two pathways one with 7 liters/s and other with 3 liters/s, then what type of flow it is?(a) Steady-state(b) Unsteady-state(c) Cannot say(d) None of the mentionedThe question was posed to me in an international level competition.The above asked question is from Steady-State and Unsteady-State Systems in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct ANSWER is (a) Steady-state |
|
| 58. |
A fluid enters a vessel at the rate of 10 liters/s, and leaves in two pathways one with 5 liters/s and other with 3 liters/s, then what type of flow it is?(a) Steady-state(b) Unsteady-state(c) Cannot say(d) None of the mentionedI have been asked this question during an interview.My query is from Steady-State and Unsteady-State Systems topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct OPTION is (B) Unsteady-state |
|
| 59. |
A reaction occurs in a vessel such that its mass does not change but its temperature is increased, then the system is which of the following?(a) Steady-state(b) Unsteady-state(c) Cannot say(d) None of the mentionedThis question was posed to me in quiz.The origin of the question is Steady-State and Unsteady-State Systems in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct ANSWER is (b) Unsteady-state |
|
| 60. |
Which of the following remains constant in the steady state system?(a) Mass(b) Energy(c) Momentum(d) DensityI got this question in an online quiz.This interesting question is from Steady-State and Unsteady-State Systems topic in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct answer is (a) MASS |
|
| 61. |
The flow in rate of A and B are 4 mole/s and 8 mole/s respectively, which under goes reaction A + B -> 3C, what is the flow out rate of C?(a) 4 mole/s(b) 8 mole/s(c) 12 mole/s(d) 24 mole/sThis question was addressed to me in quiz.Question is taken from Open and Closed Systems topic in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT ANSWER is (c) 12 mole/s The explanation is: RATE of C = 4*3 = 12 mole/s. |
|
| 62. |
The flow in rate of A and B are 8 mole/s and 10 mole/s respectively, which under goes reaction 4A + 5B -> 3C, what is the flow out rate of C?(a) 4 mole/s(b) 6 mole/s(c) 8 mole/s(d) 10 mole/sThis question was addressed to me during an internship interview.My enquiry is from Open and Closed Systems topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct OPTION is (b) 6 mole/s |
|
| 63. |
The flow in rate of A and B are 5 mole/s and 10 mole/s respectively, which under goes reaction A + 2B -> 3C, what is the flow out rate of C?(a) 5 mole/s(b) 10 mole/s(c) 15 mole/s(d) 20 mole/sThe question was asked during an interview.I would like to ask this question from Open and Closed Systems topic in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct OPTION is (C) 15 mole/s |
|
| 64. |
The flow in rate of A is 8 mole/s, it undergoes a reaction 3A -> B, what are the moles of B that comes out after 6 seconds?(a) 5(b) 8(c) 10(d) 16I have been asked this question in a job interview.I'm obligated to ask this question of Open and Closed Systems in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The CORRECT ANSWER is (d) 16 |
|
| 65. |
The flow in rate of A is 5 mole/s, it undergoes a reaction A -> 2B, what are the moles of B that comes out after 5 seconds?(a) 5(b) 10(c) 25(d) 50I have been asked this question by my college professor while I was bunking the class.This interesting question is from Open and Closed Systems topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT answer is (d) 50 For explanation I WOULD SAY: Moles of B = 5*5*2 = 50. |
|
| 66. |
What is the accumulation in the system after 4 second if the out flow and in flow rates are 3 g/s and 8 g/s?(a) 12 g(b) 20 g(c) 32 g(d) 40 gThe question was asked in unit test.This interesting question is from Open and Closed Systems in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct choice is (B) 20 G |
|
| 67. |
What is the accumulation in the system after 10 second if the out flow and in flow rates are 10 g/s and 15 g/s?(a) 5 g(b) 10 g(c) 50 g(d) 100 gThis question was addressed to me in homework.Enquiry is from Open and Closed Systems topic in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT answer is (c) 50 g Explanation: ACCUMULATION = 10*(15 – 10) = 50 g. |
|
| 68. |
The human body is an example of which of the following?(a) Closed System(b) Open System(c) Isolated System(d) None of the mentionedI have been asked this question by my school teacher while I was bunking the class.My enquiry is from Open and Closed Systems topic in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct option is (b) Open System |
|
| 69. |
A country is an example of which of the following?(a) Closed System(b) Open System(c) Isolated System(d) None of the mentionedThe question was posed to me in an online interview.Query is from Open and Closed Systems in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct CHOICE is (b) OPEN SYSTEM |
|
| 70. |
An egg is an example of which of the following?(a) Closed System(b) Open System(c) Isolated System(d) None of the mentionedI have been asked this question in quiz.I want to ask this question from Open and Closed Systems in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right answer is (a) Closed System |
|
| 71. |
A pressure cooker is an example of which of the following?(a) Closed System(b) Open System(c) Isolated System(d) None of the mentionedThis question was addressed to me during an internship interview.Enquiry is from Open and Closed Systems in section Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct option is (b) Open System |
|
| 72. |
A jar filled with water is an example of which of the following?(a) Closed System(b) Open System(c) Isolated System(d) None of the mentionedI had been asked this question during a job interview.My enquiry is from Open and Closed Systems topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» CORRECT ANSWER is (a) Closed System For EXPLANATION I would SAY: Since water is neither LEAVING nor entering the jar, this means it is a closed system. |
|
| 73. |
Desert Cooler is an example of which of the following?(a) Closed System(b) Open System(c) Isolated System(d) None of the mentionedThe question was posed to me in examination.I'm obligated to ask this question of Open and Closed Systems topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT choice is (b) Open System Explanation: SINCE water is filled and then it vaporizes in desert cooler, this means the MATERIAL is flowing in and out of the system, so it is an open system. |
|
| 74. |
How is the boundary wall of a closed system?(a) Impermeable(b) Permeable(c) Rigid(d) None of the mentionedThis question was addressed to me in an interview for internship.Query is from Open and Closed Systems in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT choice is (a) Impermeable For explanation I would SAY: Since the MATTER is not allowed to cross the boundary wall of a closed system, so the wall is impermeable. |
|
| 75. |
Which of the following is constant in a closed system?(a) Energy(b) Mass(c) Temperature(d) MomentumI had been asked this question at a job interview.This intriguing question comes from Open and Closed Systems in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct ANSWER is (b) Mass |
|
| 76. |
10 moles of A were present in a system initially, and 8 moles of C are added to it, it undergoes the reaction 5A + 3C -> 4B, what are number of moles of B produced?(a) 4(b) 6(c) 8(d) 10I had been asked this question during an online interview.This key question is from Material Balance Concept in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The CORRECT choice is (c) 8 |
|
| 77. |
8 moles of A were present in a system initially, and 24 moles of B are added to it, it undergoes the reaction 2A + 3B -> 4C + 5D, what are the number of moles of D produced?(a) 10(b) 20(c) 30(d) 40This question was addressed to me by my college director while I was bunking the class.My question is taken from Material Balance Concept in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» CORRECT choice is (C) 30 Explanation: MOLES of D = 5*4 = 20. |
|
| 78. |
There were 15 moles of a substance present initially in a system, 25 moles were added to it and a reaction occurred so that its moles are reduced by 50%, what are the final moles of a substance in the system?(a) 10(b) 15(c) 20(d) 40The question was asked in an interview for job.This interesting question is from Material Balance Concept in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right option is (c) 20 |
|
| 79. |
10 moles of A were present in a system initially, and 12 moles of C are added to it, it undergoes the reaction 2A + 3C -> 2B, what are number of moles of B produced?(a) 4(b) 5(c) 8(d) 12I got this question at a job interview.Enquiry is from Material Balance Concept topic in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The CORRECT ANSWER is (C) 8 |
|
| 80. |
There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of a substance in the system?(a) 10(b) 12(c) 15(d) 18I have been asked this question by my school principal while I was bunking the class.I want to ask this question from Material Balance Concept topic in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» CORRECT option is (b) 12 Easiest explanation: FINAL MOLES of substance = (10 + 5)*80/100 = 12. |
|
| 81. |
10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what is the number of moles of B produced?(a) 5(b) 10(c) 25(d) 50I had been asked this question during an online exam.My query is from Material Balance Concept topic in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» RIGHT answer is (c) 25 For explanation: Mole of B = 5*5 = 25. |
|
| 82. |
10 moles of A were present in a system initially, and 10 moles are added to it, it follows the reaction 4A -> B, what are the number of moles of B produced?(a) 5(b) 10(c) 15(d) 20The question was posed to me in an international level competition.The doubt is from Material Balance Concept topic in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right OPTION is (a) 5 |
|
| 83. |
A reaction is A + 2B -> 3C, if 2 moles of A and 4 moles of B entered the system, what are the number of moles of C formed?(a) 2(b) 4(c) 6(d) 8I had been asked this question during an interview.This key question is from Material Balance Concept topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The CORRECT CHOICE is (C) 6 |
|
| 84. |
A reaction has reactants 2 moles of NaOH and 1 mole of H2SO4, and products Na2SO4 and H2O, what are the total moles of products?(a) 1(b) 2(c) 3(d) 4I had been asked this question during an interview for a job.My question is taken from Material Balance Concept in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct option is (c) 3 |
|
| 85. |
In a random reaction 2 mole of CH4 and 1 mole of C2H4 are reacted, and 1 mole of C3H8 and 1 mole of CxHy are produced, what is x*y?(a) 2(b) 4(c) 8(d) 12I had been asked this question by my college professor while I was bunking the class.My doubt is from Material Balance Concept in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct choice is (b) 4 |
|
| 86. |
A combustion reaction has reactants 1 mole of CxHy and 2 moles of O2 and products 1 mole of CO2 and 2 mole of H2O, what is x + y?(a) 1(b) 3(c) 4(d) 5The question was posed to me in an interview for job.I'd like to ask this question from Material Balance Concept in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct answer is (d) 5 |
|
| 87. |
10 moles of O2 is added to 10 moles of H2, how many moles of H2O will it produce?(a) 5(b) 10(c) 15(d) 20I have been asked this question by my school teacher while I was bunking the class.This question is from Material Balance Concept in chapter Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Correct option is (B) 10 |
|
| 88. |
A container has 10 grams of water 5 grams of water is added and 2 grams of water is taken out, what is the final amount of water?(a) 7 grams(b) 10 grams(c) 13 grams(d) 15 gramsThis question was posed to me by my school principal while I was bunking the class.My doubt is from Material Balance Concept in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right ANSWER is (c) 13 grams |
|
| 89. |
The equation of material balance, (Final condition + Sum of outputs) is equal to which of the following?(a) Initial condition – Sum of inputs(b) Initial condition + Sum of inputs(c) Sum of inputs – Initial condition(d) None of the mentionedI have been asked this question during an interview.This question is from Material Balance Concept topic in division Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» Right option is (b) Initial CONDITION + Sum of inputs |
|
| 90. |
Which of the following does the concept of material balance based upon?(a) Conservation of mass(b) Conservation of energy(c) Conservation of momentum(d) Conservation of VolumeI have been asked this question during an internship interview.This intriguing question comes from Material Balance Concept in portion Introduction to Material Balances of Basic Chemical Engineering |
|
Answer» The correct option is (a) CONSERVATION of mass |
|