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Questions (78 - 84)
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In this lesson, questions (78 - 84) 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
thanku so much mam
Vanmala Ramesh
2 years ago
Can you text me your email id
Rajneesh Rai
2 years ago
mam....can u please send me pdf of haralambos n holborn again ..bcz i m not able to download the pdf which u have sent
Rajneesh Rai
2 years ago
mam my id is rairajneesh1996@gmail.com
Vanmala Ramesh
2 years ago
Vanmala Ramesh
2 years ago
Okay
Rajneesh Rai
2 years ago
thnku mam
Vanmala Ramesh
2 years ago
Please check and let me know
Rajneesh Rai
2 years ago
1. COURSE: Questions on Steam Turbine Lesson : Questions-(78-84)

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 78 In reaction turbines, with reduction of inlet pressure (a) The blade heights increase as the specific volume of steam decreases (b) The blade heights increase as the specific volume of steam increases (c) The blade heights decrease as the specific volume of steam increases (d) The blade heights decrease as the specific volume of steam decreases

4. Solution 78 _ if P reduced then u increases to handle more volume we need more area i,e. increase heights of blade Ans: b

5. Question 79 In a reaction turbine, the enthalpy drop in the fixed blade ring is 50 kJ per Kg and the enthaply drop in the moving blade ring is 25 kJ per Kg. The degree of reaction of the turbine is (a) 66.7% (b) 50.0% (c) 33.3% (d) 6,0% Ans: c

6. Question 80 Degree of reaction is defined as the ratio of (a) Enthalpy drop in moving blades to enthalpy drop in fixed blades (b) Enthalpy drop in fixed blades to total enthalpy drop in moving and fixed blades (c) Enthalpy drop in fixed blades to enthalpy drop in moving blades (d) Enthalpy drop in moving blades to total enthalpy drop in fixed and moving blades Ans : d

7. Question 81 symmetrical blading is used in a turbine when its degree of reaction is % (a) 25% (b) 50% (c) 75% (d) 100 Ans : b

8. Question 82 The impulse turbine rotor efficiency will have a maximum value 0.5 cos a where , is the nozzle exit flow angle, if the (a) Blades are equiangular (b) Blade velocity coefficient is unity (c) Blades are equiangular and frictionless (d) Blade solidity is 0.65 Ans: c

9. Question 83 The work output from a reaction turbine stage is 280 kW per kg/s of steam. If the nozzle efficiency is 0.92 and rotor efficiency is 0.90, the isentropic static enthalpy drop will be (a) 352 kW (b) 347 kw (c) 338 kW (d) 332 kW

10. Solution 83 280 -338KW Ans c

11. Solution 84 R.F (30-27)+ (28-20.2)1.08 (30-20) - 1.08 Ans a