Test: Conventional & Alternative Fuels - 3

# Test: Conventional & Alternative Fuels - 3

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## 20 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering | Test: Conventional & Alternative Fuels - 3

Test: Conventional & Alternative Fuels - 3 for Mechanical Engineering 2022 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Conventional & Alternative Fuels - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Conventional & Alternative Fuels - 3 MCQs are made for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Conventional & Alternative Fuels - 3 below.
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Test: Conventional & Alternative Fuels - 3 - Question 1

### Gasohol is a mixture of

Test: Conventional & Alternative Fuels - 3 - Question 2

### Advantage of hydrogen as an IC engine fuel

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 2

Advantages of hydrogen as an IC engine fuel:
1. Low emissions
2. Fuel availability
3. Fuel leakage is not a pollutant
4. High energy content per unit volume

Test: Conventional & Alternative Fuels - 3 - Question 3

### Consider the following advantages/ disadvantages of using hydrogen as a fuel: 1. It has high Nox emissions due to high flame temperature. 2. Fuel leakage to environment is not a pollutant. 3. It has high energy content per volume when stored as a liquid. 4. It requires heavy, bulky fuel storage both in vehicle and at the service stations. 5. It has very good engine volumetric efficiency. Q. Which of the above are correct ?

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 3

It has poor engine volumetric efficiency. Anytime gaseous fuel is used in an engine, the fuel will displace some of the inlet air and poorer volumetric efficiency will result.

Test: Conventional & Alternative Fuels - 3 - Question 4

Which of the following can’t be used to produce biodiesel ?

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 4

A variety of oils can be used to produce biodiesel and these include:

• Virgin oil feedstock
• Pure plant oil or straight vegetable oil
• Animal fats
• Algae
Test: Conventional & Alternative Fuels - 3 - Question 5

Major disadvantage of LPG as a fuel in automobile are:
1. Reduction in the life of the engine.
2. Less power compared to gasoline.
3. Knocking tendency.
Q. Which of the above is/are correct ?

Test: Conventional & Alternative Fuels - 3 - Question 6

Consider the following advantages/disadvantages of LPG as a fuel and pick the correct options:
1. Emission is much reduced by the use of LPG.
2. LPG has very poor antiknock characteristics.
3. Due to absence of carbon deposits on the electrodes of the spark plug, the life of spark plug increases.
4. LPG is. having strong odour.
5. The vehicle weight increases due to LPG cylinders.

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 6

• Less emission
• It mixes with air at all temperature
• No crankcase dilution
• High octane number hence better antiknock characteristics
• Cost saving of 50%
• Uniform mixture can be supplied to all cylinders in multi-cylinder engines
Test: Conventional & Alternative Fuels - 3 - Question 7

If petrol is used in a diesel engine, then

Test: Conventional & Alternative Fuels - 3 - Question 8

If diesel is fed by mistake in the oil tank of a petrol engine, then engine will

Test: Conventional & Alternative Fuels - 3 - Question 9

The bi-fuel engine uses

Test: Conventional & Alternative Fuels - 3 - Question 10

Performance numbers are

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 10

Each octane number at the higher range of the octane scale will produce greater anti-knock effect compared to the same unit at the lower end of the scale. Because of this non-linear variation, a new scale was derived which expresses the approximate relative engine performance.

Test: Conventional & Alternative Fuels - 3 - Question 11

Knock resistance property of diesel oil can be improved by adding small quantities of compounds except

Test: Conventional & Alternative Fuels - 3 - Question 12

The antifreeze solution commonly used in automobiles is

Test: Conventional & Alternative Fuels - 3 - Question 13

Octane number of natural gas is

Test: Conventional & Alternative Fuels - 3 - Question 14

Vapour lock is

Test: Conventional & Alternative Fuels - 3 - Question 15

The possible cause of smoky exhaust in a diesel engine could be
1. un-even distribution of fuels to cylinders.
2. exhaust valve receives too much lube oil.
3. fuel injection is late
4. water in the fuel
5. fuel injector is not adjusted right
Q. Which of these statements are correct ?

Test: Conventional & Alternative Fuels - 3 - Question 16

Stoichiometric air-fuel ratio of petrol is roughly

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 16

For petrol, stoichiometric air-fuel ratio is around 15 : 1.

Test: Conventional & Alternative Fuels - 3 - Question 17

The tendency of petrol to detonate in terms of octane number is determined by comparison of fuel with which of the following?

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 17

In the octane number test the performance of unknown gasoline is compared with that of series of reference fuels consisting of mixtures of iso-octane and normal heptane.

Test: Conventional & Alternative Fuels - 3 - Question 18

Octane number of Iso-octane is

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 18

Since Iso-octane has a very little tendency to knock and hence it has assigned an octane number of 100.

Test: Conventional & Alternative Fuels - 3 - Question 19

Ignition quality of diesel fuel is indicated by its

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 19

In case of diesel fuel, its ability to auto-ignite quickly is measured by cetane number.

Test: Conventional & Alternative Fuels - 3 - Question 20

The Cetane number of automotive diesel fuel used in India is in which one of the following ranges?

Detailed Solution for Test: Conventional & Alternative Fuels - 3 - Question 20

Cetane number: The cetane rating of a diesel fuel is a measure of its ability to autoignite quickly when it is injected into the compressed and heated air in the engine, ignition delay is affected by several engine design parameter such as compression ratio, injection time, inlet air temperature etc. It is also dependent on hydrocarbon compression of fuel and to some extent on its volatility characteristics. The cetane number is a numerical measure of the influence. The diesel fuel has in determining the ignition delay. Higher the cetane rating of fuel lesser is the property for diesel knock. In India, cetane number lies between 40 to 60.

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