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Questions (27-35)
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In this lesson , questions (27-35) 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

U
Pk
thank you so much.
Sir In 23 number question its 57 or 573?
in question no.27 you say that 3 to 4 is a isentropic compression by the mistake.at the exat time on 2:06 to 2:11 sec..i am a honest student of you lecture sir and your lecture is really awesome.
Harshit Aggarwal
2 years ago
Okay
1. COURSE: Question on I C Engine Lesson: Question (27-35)

2. About me Graduated from NIT Nagpur in 2008 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 27 Match List-I with List-II and select the correct answer using the codes given below the lists: List-II 1. Mechanical efficiency 2. Diesel cycle 3. Brake thermal efficiency 4. Otto cycle 5. 1 List-I A. Air standard efficiency of Otto cycle B. Morse test C. Constant volume cycle D. Constant pressure heat addition (r-1) Codes: A BC D A B C D (a) 5 1 4 2 ( 3 5 24 (c) 3 54 2c5 24 Ans a

4. Question 28 Match List-I (details of the processes of the cycle) with List-II (name of the cycle) and select correct answer using the codes given below the Lists: List-I A. Two isothermals and two adiabatic B. Two isothermals an C. Two adiabatic and two constant volumes D. Two adiabatic and two constant pressures4. Stirling Code: List-II 1. Otto 2. Joule 3. Carnot d two constant volumes A B CD A B C D (a 431 2 43 21 (c) 34 1 2(d 3 421 Ans C

5. Question 29 Assertion (A): In practice, the efficiency of diesel engines is higher than that of petrol engines Reason (R): For the same compression ratio, the efficiency of diesel cycle is higher than that of Otto cycle. (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: c

6. Question 30 For constant maximum pressure and heat input, the air standard efficiency of gas power cycles is in the order (a) Diesel cycle, dual cycle, Otto cycle (b) Otto cycle, Diesel cycle, dual cycle (c) Dual cycle, Otto cycle, Diesel cycle (d) Diesel. cycle, Otto cycle, dual cycle Ans a

7. Question 31 For the same maximum pressure and temperature (a) Otto cycle is more efficient than diesel cycle (b) Diesel cycle is more efficient than Otto cycle (c) Dual cycle is more efficient than Otto and diesel cycles (d) Dual cycle is less efficient than Otto diesel cycles Ans b

8. Question 32 A heat engine working on Carnot cycle receives heat at the rate of 40 kW from a source at 1200 K and rejects it to a sink at 300 K. The heat rejected is (a) 30 kW (b) 20 kW (c) 10 kW (d) 5 kW

9. Solution 32 O, O. TL =, 21 22 org =TL T2 =1200 T 1200 300 = 10kW

10. Question 33 A heat engine using lake water at 12 C as source and the surrounding atmosphere at 2 C as sink executes 1080 cycles per min. If amount of heat supplied per cycle is 57 J, what is the output of the engine'? (a) 66 W (b) 56 W (c) 46 W (d) 36 W

11. Question 34 A Diesel and Otto cycle have the same compression ratio 'r'. The cut-off ratio of the cycle is's'. The air standard efficiency of these cycles will be equal when (a) sk k (s 1) 10 (c) sk - k (s 1+ 1 0 (b) sk- k (s 1+ 10 (d) sk . (s.1). k=0

12. Question 35 For the same compression ratio and the same heat input, the correct sequence of the increasing order of the thermal efficiencies of the given cycles is (a) Otto, Diesel, dual (c) Dual, Diesel, Otto (b) Diesel, dual Otto (d) Dual, Otto, Diesel Ans: b