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Questions (57 - 63)
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In this lesson, questions (57 - 63) 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-(57 - 63)


  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 57 Assertion (A): Throttle governing is used only in small steam turbines Reason(R): At part loads, the efficiency of steam turbine reduces considerably with throttle governing. (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: d


  4. Question 58 Consider the following statements 1. Throttle governing improves quality of steam in the last few stages. 2. Internal efficiency of steam is not seriously affected by throttle governing 3. Throttle governing is better than nozzle governing. Which of these statements are correct? (a) 1, 2 and 3 (b) 1 and 3 (c) 2 and 3 (d) 1 and 2 Ans d


  5. Question 59 Governing of steam turbines can be done by the following 1. Nozzle control 3. Providing additional value and passage The correct answer will be (a) 1,2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 1 and 3 only 2. Throttle control Ans: a


  6. Question 60 Assertion (A): Nozzle control governing cannot be used in reaction steam turbines. Reason (R): In reaction steam turbines, full admission of steam must take place. (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


  7. Question 61 Efficiency of nozzle governed turbine is affected mainly by losses due to (a) Partial admission (c) Inter-stage pressure drop (b) throttling (d) condensation in last stages Ans c


  8. Question 62 Throttle governing in steam turbines (a) Leads to significant pressure loss (c) Increases heat losses (b) Increases the efficiency (d) Decreases steam temperature Ans a


  9. Question 63 An emergency governor of a steam turbine trips the turbine when I. Shaft exceeds 100% of its rated speed 2. Condenser becomes hot due to inadequate cooling water circulation 3. Lubrication system fails 4. Balancing of turbine is not proper Select the correct answer from the codes given below: (a) 1, 2 and 3 (b) 2, 3 and 4 (c) 3, 4 and 1 (d) 4, 1 and 2 Ans b


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