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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Topicwise Question Bank for Mechanical Engineering  >  Test: Air Standard Cycles - 3 - Mechanical Engineering MCQ

Test: Air Standard Cycles - 3 - Mechanical Engineering MCQ


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10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Air Standard Cycles - 3

Test: Air Standard Cycles - 3 for Mechanical Engineering 2024 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Air Standard Cycles - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Air Standard Cycles - 3 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Air Standard Cycles - 3 below.
Solutions of Test: Air Standard Cycles - 3 questions in English are available as part of our Topicwise Question Bank for Mechanical Engineering for Mechanical Engineering & Test: Air Standard Cycles - 3 solutions in Hindi for Topicwise Question Bank for Mechanical Engineering course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Air Standard Cycles - 3 | 10 questions in 30 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Topicwise Question Bank for Mechanical Engineering for Mechanical Engineering Exam | Download free PDF with solutions
Test: Air Standard Cycles - 3 - Question 1
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For the same peak pressure and heat input

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Otto cycle ⇒ 1-2-3-4
Diesel cycle 1-2'-3'-4'
It is clear from T - s diagram that the heat rejected by the Diesel cycle (area below 4'-1) is less then the heat rejection by the Otto cycle (area below 4-1); hence the diesel cycle is more efficient than Otto cycle for the condition of same maximum pressure heat input. The Dual cycle efficiency lies between the Otto and Diesel cycle.

Test: Air Standard Cycles - 3 - Question 2
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For the same peak pressure and work output

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The efficiency is given by 

The work done in Otto and Diesel cycles (areas 1 -2-3-4 and 1-2-3'-4' respectively) can be equal only if the point 3' has a greater entropy than 3 and in that Case the heat rejected by the diesel cycle is less than that of Otto cycle. Hence, for these conditions, diesel cycle is more efficient than Otto cycle and Dual cycle will be in between these two.

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Test: Air Standard Cycles - 3 - Question 3
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Time loss factor in actual cycle is due to

Test: Air Standard Cycles - 3 - Question 4
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Air standard diesel cycle has a compression ratio of 14 and cut off takes place at 6% of the stroke. What is the cut off ratio?
Detailed Solution for Test: Air Standard Cycles - 3 - Question 4

V3/V2 = Cut - off ratio
V1/ V2 = r = Compression ratio = 14
V1 = 14 V2

Test: Air Standard Cycles - 3 - Question 5
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A single cylinder compression ignition engine, operating on the air-standard diesel cycle, has a mean effective pressure of 1.0 MPa and a compression ratio of 21. The engine has a clearance volume of 5 x 10-5m3. The heat added at constant pressure is 2.0 kJ. The thermal efficiency of the engine is
Detailed Solution for Test: Air Standard Cycles - 3 - Question 5




Thermal efficiency

Test: Air Standard Cycles - 3 - Question 6
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Match List-I with List-ll and select the correct answer using the codes given below the lists:
List - I
A. Compression ratio
B. Pressure ratio
C. Cut-off ratio
D. Expansion ratio
List - II
1. Brayton cycle
2. Diesel cycle
3. Dual combustion cycle
4. Otto cycle
Codes:
     A B C D
(a) 1 4  3 2
(b) 1 4  2 3
(c) 4 1  2 3
(d) 4 1 3  2
Test: Air Standard Cycles - 3 - Question 7
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In a spark ignition working on the ideal Otto cycle, the compression ratio is 5.5. The work output per cycle (i.e., area of the P - V diagram) is equal to 23.625 x 105 x VcJ, where Vc is the clearance volume in m3. The indicated mean effective pressure is
Detailed Solution for Test: Air Standard Cycles - 3 - Question 7

Compression ratio
r = V/Vc = 5.5

Test: Air Standard Cycles - 3 - Question 8
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A turbocharged four-stroke direct injection diesel engine has a displacement volume of 0.0259 m3 (25.9 litres). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure (in MPa) is closest to
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For four stroke engine

Test: Air Standard Cycles - 3 - Question 9
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Which one of the following is NOT a necessary assumption for the air-standard Otto cycle?
Detailed Solution for Test: Air Standard Cycles - 3 - Question 9

Air-standard cycle, which is based on the following assumptions:
(i) The working medium is assumed to be a perfect gas and follows the relation pV = mRT or p = ρRT.
(ii) There is no change in the mass of the working medium.
(iii) All the processes that constitute the cycle are reversible.
(iv) Heat is assumed to be supplied from a constant high temperature source and not from chemical reactions during the cycle.
(v) The working medium has constant specific heats throughout the cycle.

Test: Air Standard Cycles - 3 - Question 10
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For maximum specific output of a constant volume cycle (Otto cycle)
Detailed Solution for Test: Air Standard Cycles - 3 - Question 10

Specific work - Cv(T3 - T4) - Cv(T2 - T1)

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