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Questions (15 - 21)
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In this lesson, questions (15 - 21) have been explained.

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

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1. COURSE: Questions on Steam Turbine Lesson : Questions -(15-21

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 15 A single-stage impulse turbine with a diameter of 120 cm runs at 3000 rpm. If the blade speed ratio is 0.42 then, the inlet velocity of steam will be (a) 79 m/s (b) 188m/s (c) 450 m/s (d) 900 m/s

4. Solution 15 blade speed velocity of steam entry m/s inlet velocity steam = Blade speed ratio = at entry 1.2 50-450 m/s Tx1.2x50- 450 m/s V,60-60 Ans: c

5. Question 16 Which one of the following is used to bring down the speed of an impulse steam turbine to practical limits? (a) A centrifugal governor (c) A large flywheel (b) Compounding of the turbine (d) A gear box Ans b

6. Question 17 Why is compounding of steam turbines done? (a) To improve efficiency (c) To reduce exit losses (b) To reduce the speed of rotor (d) To increase the turbine output Ans : b