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Questions (18-26)
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In this lesson, questions (18-26) 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

Unacademy user
i think answer of 21th question should be "C"
21 number question..ans will b option c
I think and of Q21 is c . power of cut off ratio is r not(r-1)
question 22 efficiency of diesel cycle increases with load......that is why we use diesel engines in autos and heavy vehicles as well....
  1. COURSE: Question on I C Engine Lesson: Question (18-26)


  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 18 In an air standard Otto cycle, r is the volume compression ratio and y is an adiabatic index (Cp/ C), the air standard p v efficiency is given by (a) n- (b) 17 -1 27 Ans a


  4. Question 19 For the same maximum pressure and heat input, the most efficient cycle is (a) Otto cycle (c) Brayton cycle (b) Diesel cycle (d) Dual combustion cycle Ans b


  5. Question 20 Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed, temperature and pressure conditions Reason (R): In a four stroke engine one cycle is completed in two revolutions. (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


  6. Question 21 In an air-standard Diesel cycle, r is the compression ratio, p is the fuel cut - off ratio and y is the adiabatic index Cp/ C). Its air standard efficiency is given by y-l I (p-1 (p-1) Ans: b


  7. Question 22 Assertion (A): The air standard efficiency of the diesel cycle decreases as the load is increased Reason (R): With increase of load, cut-off ratio increases (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 1S Ans: a


  8. Question 23 1) The correct sequence of the cycles given in the above T-S diagrams is (a) Vapour compression refrigeration, Rankine, Diesel, Otto (b) Rankine, Vapour compression refrigeration, Diesel, Brayton (c) Rankine, Carnot, Otto, Brayton (d) Vapour compression refrigeration, Carnot, Diesel, Otto Ans b


  9. Question 24 V const V const p = const (3) T (4) T V = const The correct sequence of the given four cycles on T-s plane in Figure (1) (3), (4) is (a) Rankine, Otto, Carnot and Diesel (b) Rankine, Otto, Diesel and Carnot (c) Otto, Rankine, Diesel and Carnot (d) Otto, Rankine, Carnot and Diesel Ans b


  10. Question 25 The order of values of thermal efficiency of Otto, Diesel and Dual cycle, when they have equal compression ratio and heat rejection, is given by (b) diesel > raual > 0tto rlat.> dual > r.iiesel otto IdieslIdual dual dieselotto Ans: d


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