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Previous year questions about Axial Flow Compressors are discussed in this video.

Deepali Namdeo
I have done my bachelor's in mechanical engineering from M.I.T.S Gwalior. Currently I am Design Engineer at Cameron, a Schlumberger Company.

Unacademy user
Sir, please continue the series.
it is very helpful course. I am very thankful to you....

  2. About ME GATE Qualified. I also have an experience of 11 months teaching Engineering subjects like Industrial, Thermodynamics, SOM, HMT. Currently working as a Design Engineer at "Cameron-A Schlumberger Company" with honors from M.I.T.S Gwalior. I am pursuing my Post graduate Diploma in Design Engineering for Oil and Gas Industry

  3. 1. Degree of reaction in an axial compressor is defined as the ratio of static [IES-1996] enthalpy rise in the (a) Rotor to static enthalpy rise in the stator (b) Stator to static enthalpy rise in the rotor (c) Rotor to static enthalpy rise in the stage (d) Stator to static enthalpy rise in the stage Ans. (c) Degree of reaction in an axial compressor is defined as the ratio of static enthalpy rise in the rotor to static enthalpy rise in the stage. 2, Compared to axial compressors centrifugal compressors are more suitable IES-2002] for (a) High head, low flow rate (c) Low head, high flow rate (b) Low head, low flow rate (d) High head, high flow rate Ans. (c) 3. Staling of blades in axial- flow compressor is the phenomenon of: (a) Air stream blocking the passage (b) Motion of air at sonic velocity (c) Unsteady, periodic and reversed flow (d) Air steam not able to follow the blade contour [IES-2002] Ans. (d) Same Q. [IES-2007]

  4. In an axial flow compressor a Fexit angle from stator a-inlet angle to stator The condition to have a 50% degree of reaction is: (a) ai- B2 4 [IES-2002] 2 inlet angle to rotor outlet angle from rotor (c) B2 and B1 Q2 (d) a,-a2 and B,-B2 Ans. (c) 5. In an axial flow compressor design, velocity diagrams are constructed fronm the experimental data of aerofoil cascades. Which one of the following statements in this regard is correct? (a) Incidence angle of the approaching air is measured from the trailing edge of the blade (b) 6 is the deviation angle between the angle of incidence and tangent to the camber line (c) The deflection e of the gas stream while passing through the cascade is given by [IES-2000] (d) e is the sum of the angle of incidence and camber less any deviation angle, i.e. Ans. (c) 6. The turbo machine used to circulate refrigerant in a large refrigeration [IES-19981 plant is: (a) A centrifugal compressor (c) An axial compressor (b) A radial turbine (d) An axial turbine Ans. (a)

  5. 7. In an axial flow compressor stage, air enters and leaves the stage axially. I the whirl component of the air leaving the rotor is half the mean peripheral velocity of the rotor blades, then the degree of reaction will be: (a) 1.00 (b) 0.75 (c) 0.50 (d)0.25 . Ans. (b) Degree of reaction, Enthalpy rise in rotor Enthalpy rise in the stage DR 1-1 9 0.75 2 2 8. If an axial flow compressor is designed for a constant velocity through all stages, then the area of annulus of the succeeding stages will: (a) Remain the same (c) Progressively increase (b) Progressively decrease (d) Depend upon the number of stages [IES-1998] Ans. (b) as pressure increases volume will decrease

  6. 9, In a multi-stage axial flow compressor with equal temperature rise in all IES-2007] stages, the pressure ratio in the subsequent stages (a) Remains constant (c) Decreases (b) Increases gradually (d) Increases rapidly Ans. (a) 10. Consider the following statements in respect of axial flow compressor: 1. An axial flow air compressor is often describe is a reversed reaction turbine. 2. With 50% degree of reaction, the velocity diagrams are symmetrical. Which of the statements given above is/are correct? (a) 1 only IES-2007] (b) 2 only (c) Both 1 and 2(d) Neither 1 nor 2 . Ans. (c)

  7. 11, The most common type of absorption system in use in industrial applications is based on the refrigerant-absorbent combination of: (a) Air-water (c) Carbon dioxide-water (b) Lithium bromide-air (d) Ammonia-water IES-1999] Ans. (d) 12. Solar energy can be directly used in IES-1999] (a) Vapour compression refrigeration system (b) Vapour absorption refrigeration system (c) Air refrigeration system (d) Jet refrigeration system Ans. (b)

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