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Questions (29 - 35)
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In this lesson, questions (29 - 35) have been discussed.

Harshit Aggarwal
Cleared UPSC ESE twice with Rank 63 and 90 in mechanical engg. Got 99 percentile in GATE. Cracked ONGC, BHEL,ISRO, SAIL, GAIL successfully

U
Unacademy user
thankyou sir for this awesome series on measurements ...
Pawan Chandani
a year ago
most welcome...then plz do rate, review and share this course
  1. COURSE: Questions on Steam Turbine Lesson : Questions -(29-35)


  2. About me Graduated from NIT Nagpur in 2008 A. Cleared Engineering Services Examination (ESE-UPSC) Exam Got the offer letter from most of the Maharatna and Navratna Companies Cleared GATE Exam Rate, Review, Recommend, Share <* Follow me on Unacademy at: https://unacademy.in/user/harshit aggarwal


  3. Question 29 Match List-I (Machines) with List-II (Features) and select the correct answer using the codes given below the lists: List-II (Features) List-I (Machines) A. Steam engine B. Impulse turbine C. Reaction turbine D. Centrifugal compressor Codes A B C 1. Velocity compounding 2. Diagram facto:r 3. Continuous pressure drop 4. Isentropic efficiency A B C D D (a) 3 42b 2 (c) 243 c31 24 34 Ans : b


  4. Question 30 Among other things, the poor part-load performance of De laval turbines is due to the (a) Formation of shock waves in the nozzle (b) Formation of expansion waves at the nozzle exit (c) Turbulent mixing at the nozzle exit (d) Increased profile losses in the rotor. Ans b


  5. Question 31 Assertion (A): Reaction blading is commonly used in intermediate and low pressure parts of steam turbines. Reason (R): Reaction blading gives higher efficiency than impulse blading. (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true Ans b


  6. Question 32 Partial admission steam turbine refers to the situation where the (a) Steam is admitted partially into the blades through nozzles (b) Nozzles occupy the complete circumference leading into the blade annulus (c) Nozzles do not occupy the complete circumference leading into the annulus (d) Steam is admitted partially into the blades directly Ans: c


  7. Question 33 If the enthalpy drop in the moving blades and fixed blades of a steam turbine is 10 kJ/kg and 15 kJ/kg respectively then what is the degree of reaction? (a) 67% (b) 60% (c) 40% (d) 33%


  8. Solution 33 Degree of reaction 10 10 10+15 25 Ans c


  9. Question 34 In a reaction turbine the enthalpy drop in a stage is 60 units. The enthalpy drop in the moving blades is 32 units. What is the degree of reaction? (a) 0 533 (b) 0 284 (c) 0-466 (d) 1 875


  10. Solution 34 (Ah) (sh)(320.533 (M.eo = 0.533 mb : Degree of reaction .(M)..( Ans a


  11. THANK YOU