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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Topicwise Question Bank for Mechanical Engineering  >  Test: Combustion & Combustion Chambers Of IC Engine - 3 - Mechanical Engineering MCQ

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Mechanical Engineering MCQ


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20 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Combustion & Combustion Chambers Of IC Engine - 3

Test: Combustion & Combustion Chambers Of IC Engine - 3 for Mechanical Engineering 2024 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Combustion & Combustion Chambers Of IC Engine - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Combustion & Combustion Chambers Of IC Engine - 3 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Combustion & Combustion Chambers Of IC Engine - 3 below.
Solutions of Test: Combustion & Combustion Chambers Of IC Engine - 3 questions in English are available as part of our Topicwise Question Bank for Mechanical Engineering for Mechanical Engineering & Test: Combustion & Combustion Chambers Of IC Engine - 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: Combustion & Combustion Chambers Of IC Engine - 3 | 20 questions in 60 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: Combustion & Combustion Chambers Of IC Engine - 3 - Question 1
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An engine using octane air mixture has N2, O2, CO2, CO and H2O as constituents in the exhaust gas. Which one of the following can be conceded?

Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 1

Increase of O2 and CO in flue gas analysis indicated incomplete combustion.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 2
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Knocking in spark ignition engine can be reduced by

Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 2

When the spark is advanced, burning gas is compressed by the rising piston and therefore temperature and pressure are increased, thus tendency to knock increases. But by retarding the spark timings the peak pressure are reached further down on the power stroke and thus tendency of knock in SI engine decreases.

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Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 3
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The ignition of the charge by some hot surface within the engine before the passage of spark is called

Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 3

The surface ignition occurs before the passage of the spark is called pre-ignition. Pre-ignition generally caused by an overheated spot which may occurs at the spark plug, combustion chamber deposits or exhaust valves. Mostly spark plug is very prone for pre-ignition because very high temperatures in the order of 1100°C are required to produce pre-ignition.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 4
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For minimizing knocking tendency is SI engine, where should be spark plug be located?
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 4

For minimizing knocking tendency in SI engine spark plug should be located near the exhaust valve.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 5
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The delay period in Cl engine depends upon which of the following?
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 5

Delay period is affected by the following factors:
(i) Fuel
(ii) Injection pressure or size of droplet
(iii) Injection advance angle
(iv) Compression ratio
(v) Intake temperature
(vi) Jacket water temperature
(vii) Fuel temperature
(viii) Intake pressure or super charging
(ix) Speed
(x) Air-fuel ratio
(xi) Engine size
(xii) Type of combustion chamber

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 6
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The tendency of knocking in LC. engine reduced by
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 6

Injection of fuel just before TDC will have high temperature surrounding so less delay period.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 7
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Increasing the compression ratio in Si engines the knocking tendency
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 7

Increasing the compression ratio increases both the temperature and pressure. Increase in temperature reduces the delay period of the end gas hence tendency to knock increase.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 8
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Decreasing the cooling water temperature in SI engines, the knocking tendency
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 9
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Detonation in SI engines occur due to
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 10
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Desirable characteristics of the combustion chamber for SI engines to avoid knock is
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 11
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In Cl engines with increase in compression ratio the delay period
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 11

Increase in compression ratio, reduces the delay period as it raises both temperature and density.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 12
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Knocking takes place in Cl engines
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 12

In Cl engine detonation occurs near the beginning of combustion while in SI engine detonation occurs near the end of combustion.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 13
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In Cl engines knocking tendency increases with
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 13

Increase in compression ratio reduces the delay period as it raises both temperature and density, which decreases the knocking tendency of Cl engine.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 14
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In Cl engines by increasing inlet air pressure the knocking tendency
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 15
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In Cl engines the delay period is affected by
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 16
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Match List-I with List-Il and select the correct answer using the codes given below the lists:
List-I
 A. Cetane number
B. Approach and range
C. 
D. dh = cpdT, even when pressure varies
List-II
1. Ideal gas
2. Van der Waals gas
3. SI engines
4. Cl engines
5. Cooling towers
6. Heat exchangers
Codes: A
      A  B  C  D
(a) 1   2  3   4
(b) 1   2  4   5
(c) 4   5  2   1
(d) 5   4  1   2
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 17
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Which one of the following action(s) increase(s) the knocking tendency in the SI engine?
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 17

Increasing CR will increases temperature and reduction in engine speed slows down flame speed travel.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 18
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Which of the following feature(s) is/are used in the combustion chamber design to reduce SI engine knock?
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 18

The spark plug should be located closed to exhaust valve. So that it is not in the end region otherwise detonation will occur.

Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 19
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Which of the following factor(s) increase(s) the tendency for knocking in Cl engine?
Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 20
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A diesel engine is usually more efficient than a spark ignition engine because
Detailed Solution for Test: Combustion & Combustion Chambers Of IC Engine - 3 - Question 20

For same compression ratio and the same heat supplied, Otto cycle is most efficient and diesel cycle is least efficient.
In practice, however, the compression ratio of the Diesel engine ranges between 14 and 25 whereas that of the Otto engine between 6 and 12. Due to higher compression ratio diesel engine is more efficient than petrol.

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