

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.
1. |
Why can’t build an ideal supersonic diffuser with no total pressure losses?(a) Presence of shock waves(b) Varying cross – sectional area(c) Varying throat area(d) Choked flowThe question was asked in a job interview.I would like to ask this question from Quasi-One-Dimensional Flow Diffusers topic in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right CHOICE is (a) Presence of shock waves |
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2. |
What is the diffuser efficiency of a normal shock diffuser?(a) 1(b) 0(c) Inifinty(d) \(\frac {1}{2}\)The question was asked in my homework.I want to ask this question from Quasi-One-Dimensional Flow Diffusers in division Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right answer is (a) 1 |
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3. |
How is flow deaccelerated In the diffuser?(a) Isentropic compression(b) Isentropic expansion(c) Adiabatic compression(d) Adiabatic expansionI have been asked this question in examination.Question is from Quasi-One-Dimensional Flow Diffusers in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct choice is (a) ISENTROPIC compression |
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4. |
In the area – Mach relation A < A^* or A ≥ A^*.(a) True(b) FalseThe question was posed to me in a national level competition.The doubt is from Nozzles in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct answer is (b) False |
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5. |
Which equation is obtained when Mach number is equated to zero in area-velocity relation?(a) Momentum equation(b) Continuity equation(c) Energy equation(d) Bernoulli’s equationI got this question in semester exam.My doubt stems from Area-Velocity Relation in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right option is (b) Continuity equation |
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6. |
Sonic flow exists at the throat of an equilibrium chemically reacting nozzle flow?(a) True(b) FalseThe question was asked in a national level competition.My question comes from Area-Velocity Relation in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct option is (a) True |
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7. |
Which is the Euler’s equation for the quasi – one dimensional flow?(a) dp = \(\frac {ρ}{u}\)du(b) dp = –\(\frac {u}{ρ}\)du(c) dp = -ρudu(d) dp = ρuduThe question was asked in semester exam.This interesting question is from Governing Equations in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct answer is (c) dp = -ρudu |
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8. |
In which of these conditions there’s no formation of shock wave inside a convergent – divergent nozzle?(a) Overexpanded(b) Underexpanded(c) Fully expanded(d) Fully underexpandedI have been asked this question by my college director while I was bunking the class.I'd like to ask this question from Nozzles topic in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct answer is (c) Fully expanded |
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9. |
Why is the diffuser throat area greater than the nozzle throat area?(a) To reduce speed(b) To maintain constant mass flow rate(c) Rise in entropy within diffuser(d) Rise in entropy within nozzleI had been asked this question in a job interview.Enquiry is from Quasi-One-Dimensional Flow Diffusers topic in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct ANSWER is (c) RISE in entropy within diffuser |
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10. |
Oblique shock diffuser has a better pressure recovery than a normal shock diffuser.(a) True(b) FalseThe question was posed to me in examination.My query is from Quasi-One-Dimensional Flow Diffusers in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct option is (a) True |
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11. |
What is the minimum area of a duct known as?(a) Throat(b) Minimum area duct(c) Convergent duct(d) Divergent ductThe question was asked in final exam.Enquiry is from Area-Velocity Relation topic in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct OPTION is (a) THROAT |
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12. |
According to the energy equation, which of these properties remain constant along the flow?(a) Total enthalpy(b) Total entropy(c) Kinetic energy(d) Potential energyThe question was posed to me by my college professor while I was bunking the class.My question comes from Governing Equations in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct option is (a) Total enthalpy |
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13. |
What causes the flow properties to vary in quasi – one – dimensional flow?(a) Cross – sectional area(b) Normal shock(c) Head addition(d) Frictional dragThe question was posed to me in an international level competition.My query is from Governing Equations in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct CHOICE is (a) Cross – SECTIONAL area |
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14. |
What is the momentum equation for a quasi – one dimensional flow?(a) p1A1 + ρ1u\(_1^2\)A1 + \(\int_{A_1}^{A_2}\)pdA = p2A2 + ρ2u\(_2^2\)A2(b) p1A1u1+ ρ1u\(_1^2\)A1 + \(\int_{A_1}^{A_2}\)pdA = p2A2u2+ ρ2u\(_2^2\)A2(c) p1A1 + ρ1u\(_1^2\)A1 = p2A2 + ρ2u\(_2^2\)A2(d) p1A1u1+ ρ1u\(_1^2\)A1 = p2A2u2+ ρ2u\(_2^2\)A2This question was posed to me in unit test.The question is from Governing Equations in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right option is (a) p1A1 + ρ1u\(_1^2\)A1 + \(\int_{A_1}^{A_2}\)pdA = p2A2 + ρ2u\(_2^2\)A2 |
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15. |
Which of these conditions result in underexpanded nozzle?(a) Pe = Pa(b) Pe > Pa(c) Pe < Pa(d) Pe |
Answer» The correct CHOICE is (b) Pe > PA |
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16. |
What happens to the mass flow rate if the reservoir pressure is doubled?(a) Doubled(b) Remains same(c) Becomes half(d) Becomes one – fourthI got this question in a national level competition.This intriguing question comes from Nozzles in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right choice is (a) DOUBLED |
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17. |
For which of these flows do we need a divergent duct to increase the velocity of the flow?(a) Subsonic flow(b) Supersonic flow(c) Hypersonic flow(d) Sonic flowThe question was posed to me in an interview.This interesting question is from Area-Velocity Relation in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct option is (b) SUPERSONIC flow |
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18. |
For a subsonic flow, what should be the value of dA to get flow acceleration?(a) Zero(b) Negative(c) Positive(d) OneI have been asked this question in an interview for job.This interesting question is from Area-Velocity Relation in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct answer is (b) Negative |
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19. |
What happens if the second throat area is larger than the starting value when the wind tunnel starts and the reservoir pressure value is opened?(a) Normal shock is swallowed by diffuser(b) Normal shock remains upstream of diffuser(c) Throat area has no effect(d) Normal shock is generated at the inletI had been asked this question in an international level competition.I need to ask this question from Quasi-One-Dimensional Flow Diffusers in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right option is (a) Normal SHOCK is swallowed by diffuser |
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20. |
What happens in case of a choked flow?(a) When flow becomes supersonic at the throat(b) When flow is sonic and mass flow remains constant at the throat despite reducing exit pressure(c) When the exit pressure is reduced to a point where the flow becomes subsonic at throat(d) Normal shock is created at the inlet of the nozzleI got this question by my school teacher while I was bunking the class.Origin of the question is Nozzles topic in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right OPTION is (b) When flow is sonic and mass flow remains constant at the THROAT despite reducing exit pressure |
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21. |
The area – Mach number relation yields how many solution(s) for a given Mach number?(a) 1(b) 2(c) 3(d) 0I got this question in an international level competition.I'm obligated to ask this question of Nozzles topic in division Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct option is (b) 2 |
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22. |
The governing equations for quasi – one – dimensional flow is used to find properties of flow in a nozzle.(a) True(b) FalseI got this question in final exam.This intriguing question comes from Governing Equations in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct answer is (a) True |
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23. |
If the given conditions for a nozzle are P01 = 1 atm, Pe = 0.3143 atm, then what is the ratio of exit area to throat area?(a) 1.15(b) 1.5(c) 1.25(d) 1.115The question was posed to me in unit test.This interesting question is from Nozzles topic in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» RIGHT choice is (d) 1.115 Explanation: Given, P01 = 1 ATM, Pe = 0.3143 atm To CALCULATE – \(\frac {A_e}{A^*}\) Stagnation pressures remain same P01 = P0e \(\frac {P_{0e}}{P_e} = \frac {1}{0.3143}\) = 3.182 For \(\frac {P_{0e}}{P_e}\) = 3.182 we GET Me = 1.4 (Using gas table) For Me = 1.4, we get \(\frac {A_e}{A^*}\) = 1.115 (Using gas table) |
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24. |
What is the entropy relation between the entry and exit of an actual diffuser?(a) s1 = s2(b) s1 > s2(c) s1 < s2(d) s1 s2 = 1The question was asked in an online quiz.I'm obligated to ask this question of Quasi-One-Dimensional Flow Diffusers in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct answer is (C) s1 < s2 |
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25. |
For a flow in a duct, what is Mach number a function of?(a) Local duct area to sonic throat area(b) Sonic throat area to local duct area(c) Local duct area to convergent duct area(d) Local duct area to divergent duct areaI have been asked this question in homework.I would like to ask this question from Nozzles in division Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct choice is (a) Local duct area to sonic throat area |
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26. |
What is the role of the diffuser?(a) Increase the flow velocity after test section(b) Decrease the flow velocity after test section(c) Increase the flow velocity inside test section(d) Decrease the flow velocity inside the test sectionThe question was posed to me by my school principal while I was bunking the class.I'd like to ask this question from Quasi-One-Dimensional Flow Diffusers topic in division Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right answer is (b) Decrease the flow velocity after test section |
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27. |
In case of the formation of shock in the divergent section of a C – D nozzle, the flow remains isentropic.(a) True(b) FalseI have been asked this question during an interview for a job.My question comes from Nozzles topic in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Correct option is (b) False |
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28. |
Which of these properties remain constant in the ideal isentropic supersonic diffuser?(a) Total pressure(b) Velocity(c) Mach number(d) Mass flowI had been asked this question in an international level competition.My question is from Quasi-One-Dimensional Flow Diffusers topic in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct option is (a) TOTAL pressure |
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29. |
Why is a variable – geometry diffuser used?(a) Ease in manufacturing(b) Higher efficiency(c) More mass flow rate(d) InexpensiveI had been asked this question by my college director while I was bunking the class.The above asked question is from Quasi-One-Dimensional Flow Diffusers in division Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct ANSWER is (B) Higher efficiency |
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30. |
What is the exit Mach number if the convergent nozzle is choked?(a) 0(b) 1(c) 0.5(d) 1.5This question was addressed to me during an interview.My question comes from Nozzles in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct CHOICE is (B) 1 |
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31. |
What happens to the velocity of the supersonic flow in the convergent duct?(a) Decreases(b) Increases(c) Remains the same(d) Changes periodicallyThis question was posed to me in homework.I'd like to ask this question from Area-Velocity Relation topic in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right choice is (a) DECREASES |
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32. |
Total pressure loss in a normal shock diffuser is less than the oblique shock diffuser.(a) True(b) FalseThe question was asked during an online exam.My question is based upon Quasi-One-Dimensional Flow Diffusers in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The CORRECT answer is (b) False |
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33. |
What is the differential form of energy equation for quasi one – dimensional flow?(a) dh – u^2du = 0(b) dh – udu = 0(c) dh + u^2du = 0(d) dh + udu = 0I got this question in an interview.I need to ask this question from Governing Equations topic in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The CORRECT option is (d) dh + udu = 0 |
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34. |
Which of this conditions is necessary to achieve flow in a nozzle?(a) \(\frac {P_e}{P_0}\) < 1(b) \(\frac {P_e}{P_0}\) > 1(c) \(\frac {P_e}{P_0}\) = 1(d) \(\frac {P_e}{P_0}\) = 0The question was asked in an interview for internship.I need to ask this question from Nozzles topic in division Quasi-One-Dimensional Flow of Aerodynamics |
Answer» The correct answer is (a) \(\frac {P_e}{P_0}\) < 1 |
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35. |
What is the differential form of momentum equation for the quasi one – dimensional flow known as?(a) Froude equation(b) Euler’s equation(c) Kelvin’s equation(d) Bernoulli’s equationI had been asked this question in an online quiz.Query is from Governing Equations in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right choice is (B) Euler’s equation |
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36. |
What is the diffuser efficiency for supersonic flow?(a) ηD = 1(b) ηD > 1(c) ηD < 1(d) ηD = 1/2I got this question in exam.Question is taken from Quasi-One-Dimensional Flow Diffusers topic in portion Quasi-One-Dimensional Flow of Aerodynamics |
Answer» CORRECT answer is (b) ηD > 1 For explanation: The diffuser efficiency is given by the RATIO of actual total pressure ratio across the diffuser to the total pressure ratio of a hypothetical normal shock wave at test section Mach number. For a supersonic test section Mach number, the diffusers perform better than the normal shock, thus the numerator of the ratio is greater than the denominator, HENCE ηD > 1. |
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37. |
Which of these phenomena attenuates the advantages of greater pressure recovery in an oblique shock diffuser?(a) Abrupt change of convergent – divergent sections(b) Shock wave interaction with walls(c) Isentropic flow(d) Presence of normal shockI got this question during an online interview.I'm obligated to ask this question of Quasi-One-Dimensional Flow Diffusers in section Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right answer is (b) SHOCK wave interaction with WALLS |
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38. |
The trends of velocity change in a duct for both subsonic and supersonic flow are identical.(a) True(b) FalseI got this question by my college professor while I was bunking the class.My doubt stems from Area-Velocity Relation in chapter Quasi-One-Dimensional Flow of Aerodynamics |
Answer» Right option is (b) False |
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