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Questions (22-28)
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In this lesson, questions (22 -28) 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
thanks so much for such innovative lecture
  1. COURSE: Questions on Steam Turbine Lesson : Questions -(22-28)


  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 22 Which of the following statements are correct? 1. Impulse turbine rotor blades are thick at the centre 2. Rateau turbine is more efficient than Curtis turbine. 3. Blade velocity coefficient for an impulse turbine is of the order of 60%. (a) 1, 2 and 3 (b) 1 and2 (c) 1 and 3 (d) 2 and 3 Ans : b


  4. Question 23 Assertion (A): Modern turbines have velocity compounding at the initial stages and pressure compounding in subsequent stages Reason (R): Excessive tip leakage occurs in the high pressure region of reaction 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 a


  5. Question 24 The net result of pressure-velocity compounding of steam turbine is: (a) Less number of stages (b) Large turbine for a given pressure drop (c) Shorter turbine for a given pressure drop (d) Lower friction losS Ans a


  6. Question 25 In Parson's reaction turbines, the velocity diagram triangles at the inlet and outlet are which of the following? (a) Asymmetrical (b) Isosceles (c) Right-angled(d) Congruent Ans d


  7. Question 26 Match List-I (Different turbine stages) with List-II (Turbines) and select the correct answer using the codes given below the lists: List-I A. 50% reaction stage B. Two-stage velocity compounded turbine C. Single-stage impulse D. Two-stage pressure compounded turbine List-II 1. Rateau 2. Parson 3. Curtis 4. De-Laval 5. Hero Code: A 12 _3, .(b). 5321 (a) 5 (c)2 341 (d) 3 42 Ans : C


  8. Question 27 Assertion (A): The work done in Parson's reaction turbine is twice the work done during expansion in the moving blades Reason (R): The steam expands both in the moving as well as in the fixed blades in a reaction turbine and in the Parson's turbine, the fixed and moving blades are identical. (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 : a


  9. Question 28 The correct sequence of the given steam turbines in the ascending order of efficiency at their design points is (a) Rateau, De Laval, Parson's, Curtis (b) Curtis, De Laval, Rateau, Parson's. (c) De Laval, Curtis, Rateau, Parson's (d) Parson's, Curtis, Rateau, De Laval Ans c


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