Aircraft Propulsion Elementary Quiz


1           A turbojet engine works on
                                     1. Law of conservation of mass 
2. Law of conservation of energy
3. Newton's first law of motion
4. Newton's third law of motion
5. none of the above

2           A turbofan engine works on
                                      1. Law of conservation of mass 
2. Law of conservation of energy
3. Newton's first law of motion
4. Newton's third law of motion
5. none of the above

3           A ramjet engine works on
                                     1. Law of conservation of mass 
2. Law of conservation of energy
3. Newton's first law of motion
4. Newton's third law of motion
5. none of the above

4           A rocket engine works on
                                     1. Law of conservation of mass 
2. Law of conservation of energy
3. Newton's first law of motion
4. Newton's third law of motion
5. none of the above

     5            Which of the following engines can work in space?
1. Turbojet
2.  Turbofan
3.  Aerodynamic duct
4.  Turboprop
5.  none of the above       

6           The maximum speed at the exit convergent nozzle area of turbojet engine can be
1.  of any value
2.  sonic only
3.  subsonic only
4.  supersonic only
5. none of the above

7            The maximum speed at the exit of divergent portion of turbojet nozzle can be
1.  of any value
2.  sonic only
3.  subsonic only
4.  supersonic only
5.  none of the above

8           Propulsive efficiency of turbojet increases
1.  as forward speed increases
2.  as forward speed decreases
3.  as forward speed increases and upto when it becomes equal to exhaust jet speed
4.  as forward speed increases and becomes double the exhaust jet speed
5. none of the above

      9           Propulsive efficiency of ramjet increases
1.  as forward speed increases
2.  as forward speed decreases
3.  as forward speed increases and upto when it becomes equal to exhaust jet speed
4.  as forward speed increases and becomes double the exhaust jet speed
5. none of the above

10         Propulsive efficiency of ramjet increases
1.  at subsonic speeds
2.  at supersonic speeds
3.  at hypersonic speeds
4.  at high subsonic speeds
5.  none of the above                   

11          At low subsonic speeds, which one of the following has maximum propulsive efficiency?
1. rocket
2. turbojet
3. ramjet
4. turboprop
5. scramjet

12          Thrust can be measured with
1. pitot tube
2. static tube
3. dynamometer
4. pitot-static tube
5. torquemeter

13          At Mach 20 speed, which one of the following has maximum propulsive efficiency?
1. rocket
2. turbojet
3. ramjet
4. turboprop
5. scramjet

14          A fighter plane is standing still with its engine running at the take off point. Its propulsive   efficiency is
1. minimum
2. maximum
3. medium
4. zero
5. none of the above
                                          
15          A fighter plane is standing still with its engine running at take off point. Its thrust is
1. minimum
2. maximum
3. medium
4. zero
5. none of the above

16          A turbojet works on
1.  constant pressure thermodynamic cycle
2.  constant volume thermodynamic cycle
3.  constant entropy thermodynamic cycle
4.  Otto cycle 
5.  Carnot cycle
17           Which of the following engines has no moving parts?
1. rocket
2. turbojet
3. ramjet
4. turboprop
5. none of the above

18          SCRAMJET means
1. sonic combustion ramjet
2. subsonic combustion ramjet
3. supersonic combustion ramjet
4. subsonic-supersonic combustion ramjet
5. none of the above

19          Small very slow-speed aircraft often have
1. turboprop
2. turbojet
3. rockets 
4. ramjet
5. propeller mounted on piston engine

     20           Exhaust jet speed is highest in
1. turboprop
2. turbojet
3. rockets 
4. ramjet
5. propeller mounted on piston engine


Comments

  1. Q1 to Q5
    All jet engines work on newton's third law of motion and as there is no air in space so no aerodynamics is used in space....
    Q6
    Maximum exhaust velocity in case of convergent nozzle can be mach1
    Q7
    If we use a divergent nozzle only, then the speed will be subsonic but in case of a CD nozzle tge speed may be subsonic or supersonic
    Q8
    The propulsive efficiency is ratio of propulsive power to mechanical generated power, ie, PE=2u0/(u0+ uE)
    So, on increasing airspeed and decreasing exit speed the propulsive efficiency doubles
    Q10
    There are no moving parts in ramjet, so no mechanical work... But tge efficiency increase at supersonic speed
    Q11
    Turboprop at subsonic speed has highest propulsive eff
    Q12
    Pitot tube will tell us the velocity and then thrust can be calculated
    Q13
    Scramjet
    Q14
    Maximum
    Q15
    Mimimum or zero
    Q16
    Turbojet works on brayton cycle or constant entropy cycle
    Q17
    Ramjet
    Q18
    Supersonic ram jet
    Q19
    Propeller mounted on piston engine
    Q20
    In rockets or in ramjets

    ReplyDelete
    Replies
    1. Great attempt. You have good understanding of the subject.
      Kindly have a relook at the questions no. 7, 8, 9, 10, 12, 13, 14, 15, 16 & 20.

      Delete
  2. 1-Newton's third law of motion
    - Newton's third law of motion
    3-Newton's third law of motion
    4-Newton's third law of motion
    5-none of the above
    6-sonic only
    7-supersonic only
    8- as forward speed increases and upto when it becomes equal to exhaust jet speed
    9-as forward speed increases
    10-at supersonic speeds
    11-turboprop
    12-pitoit tube for total thrust and pitoit ststic for velocity thrust only
    13-scramjet
    14-zero
    15-maximum
    16-constant pressure thermodynamic cycle
    17-ramjet
    18-supersonic cumbustion ranjet
    19-turboprop
    20-rocket


    ReplyDelete
    Replies
    1. Great attempt. Kindly revise your answers to the question numbers 9, 10, 12, 13 & 19.

      Delete
  3. Q1. newotn's 3rd law of motion.
    Q2. "
    Q3. "
    Q4. "
    Q5. none of the above
    Q6. sonic speed only.
    Q7. "
    Q8. As forward speed increase and upto when it becomes equal to exhaust jet speed.
    Q9. "
    Q10. At hypersonic speed due to ram effect
    Q11. turboprop
    Q12. pitot-static pressure and it calculates both static and dynamics pressure which is needed to find thrust.
    Q13. scramjet
    Q14. zero as no work done.
    Q15. mazimum
    Q16. Braton cycle which is also called as contant pressure heat engine
    Q17. ramjet
    Q18. supersonic combustion ramjet
    Q19. propeller mounted on piston engine
    Q20. rockets.

    ReplyDelete

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