Why iso-octane is chosen as reference fuel for S.I. engines and allotted 100 value for its octane number ?

Why iso-octane is chosen as reference fuel for S.I. engines and allotted 100 value for its octane
number ?
by

1 Answer

Answer :

Iso-octane permits highest compression without causing knocking
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Why iso-octane is chosen as reference fuel for S.I. engines and allotted 100 value for its octane number ?

Description : Why iso-octane is chosen as reference fuel for S.I. engines and allotted 100 value for its octane number ?

Last Answer : Iso-octane permits highest compression without causing knocking.

Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octane is chemically known as (A) α-methyl naphthalene (B) 2-2-4 tri methyl pentane (C) 1, 3 butadiene (D) Tetra methyl ethylene

Description : Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octane is chemically known as (A) α-methyl naphthalene (B) 2-2-4 tri methyl pentane (C) 1, 3 butadiene (D) Tetra methyl ethylene

Last Answer : (B) 2-2-4 tri methyl pentane

The two reference fuel used for cetane rating are (a) Cetane and iso octane (b) Cetane and tetra ethyl lead (c) Cetance and n-heptane (d) Cetane and α- methyl naphthalene

Description : The two reference fuel used for cetane rating are (a) Cetane and iso octane (b) Cetane and tetra ethyl lead (c) Cetance and n-heptane (d) Cetane and α- methyl naphthalene

Last Answer : Ans : d

Reference fuels for knock rating of SI engine fuels would include (a) Iso octane alpha methyl naphthalene (b) Normal octance and aniline (c) Isooctance and n octane (d) N heptane and iso octane

Description : Reference fuels for knock rating of SI engine fuels would include (a) Iso octane alpha methyl naphthalene (b) Normal octance and aniline (c) Isooctance and n octane (d) N heptane and iso octane

Last Answer : Ans : d

A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of a) 75% iso-octane and 25% normal heptane b) 75% normal heptane and 25% iso-octane c) 75% petrol and 25% diesel d) 75% diesel and 25% petrol

Description : A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of a) 75% iso-octane and 25% normal heptane b) 75% normal heptane and 25% iso-octane c) 75% petrol and 25% diesel d) 75% diesel and 25% petrol

Last Answer : Answer: a Explanation: None.

Write the values of boiling temperature for cetane(diesel).iso-octane(petrol), Butane, Propane an methane fuel and write effect of it on its system.

Description : Write the values of boiling temperature for cetane(diesel).iso-octane(petrol), Butane, Propane an methane fuel and write effect of it on its system.

Last Answer : Write the values of boiling temperature for cetane(diesel).iso-octane(petrol), Butane, Propane an methane fuel and write effect of it on its system.

Which of the following fuel detonates readily? a) Benzene b) Iso-octane c) Normal heptane d) Alcohol

Description : Which of the following fuel detonates readily? a) Benzene b) Iso-octane c) Normal heptane d) Alcohol

Last Answer : Answer: c Explanation: Normal heptane detonates readily.

Which of the following fuel has little tendency towards detonation? a) Benzene b) Iso-octane c) Normal heptane d) Alcohol

Description : Which of the following fuel has little tendency towards detonation? a) Benzene b) Iso-octane c) Normal heptane d) Alcohol

Last Answer : Answer: b Explanation: Benzene has little tendency towards detonation.

The compound that has the least value for octane number is – (1) 2-methyl heptane (2) Iso-octane (3) 2,2-dimethyl hexane (4) n-heptane

Description : The compound that has the least value for octane number is – (1) 2-methyl heptane (2) Iso-octane (3) 2,2-dimethyl hexane (4) n-heptane

Last Answer : (4) n-heptane Explanation: Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of O.

The compound that has the least value for octane number is : (1) 2-methyl heptane (2) Iso-octane (3) 2,2-dimethyl hexane (4) n-heptane

Description : The compound that has the least value for octane number is : (1) 2-methyl heptane (2) Iso-octane (3) 2,2-dimethyl hexane (4) n-heptane

Last Answer : n-heptane

Which are the reference fuels for knock rating of S.I. engines ?

Description : Which are the reference fuels for knock rating of S.I. engines ?

Last Answer : n-heptane and ISO-octane.

__________ prohibits the use of alcohols directly in petrol engines. (A) Low octane number (B) High cost & availability (C) Low flash point (D) Low calorific value

Description : __________ prohibits the use of alcohols directly in petrol engines. (A) Low octane number (B) High cost & availability (C) Low flash point (D) Low calorific value

Last Answer : (B) High cost & availability

Octane number of gasoline is obtained by comparing the performance of the engine when running on a mixture of the following hydrocarbons A. ethane and methane B. normal heptane and iso-octane C. iso-heptane and octane D. iso-octane and TEL

Description : Octane number of gasoline is obtained by comparing the performance of the engine when running on a mixture of the following hydrocarbons A. ethane and methane B. normal heptane and iso-octane C. iso-heptane and octane D. iso-octane and TEL

Last Answer : ANSWER : B

A mixture containing 65% of iso-octane and 35% of normal heptane will have a) cetane number 65 b) octane number 65 c) cetane number 35 d) octane number 35

Description : A mixture containing 65% of iso-octane and 35% of normal heptane will have a) cetane number 65 b) octane number 65 c) cetane number 35 d) octane number 35

Last Answer : Answer: b Explanation: A mixture containing 65% of iso-octane and 35% of normal heptane will have octane number 65 as octane number is the number percentage containing iso-octane.

Pick out the correct statement. (A) Paraffins have higher octane number than corresponding iso-paraffin (B) Paraffins have lower smoke point than aromatics

Description : Pick out the correct statement. (A) Paraffins have higher octane number than corresponding iso-paraffin (B) Paraffins have lower smoke point than aromatics

Last Answer : (B) Paraffins have lower smoke point than aromatics

Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts (C) All the alkylation processes use very high temperature (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Description : Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF ... (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Last Answer : (C) All the alkylation processes use very high temperature (> 1000°C)

Octane number of petrol normally used in petrol engines is of the order of a. 20-30 b. 40-60 c. 60-70 d. 80-90

Description : Octane number of petrol normally used in petrol engines is of the order of a. 20-30 b. 40-60 c. 60-70 d. 80-90

Last Answer : ANSWER d. 80-90

Is it true that higher octane gasoline is consumed more slowly by engines,and it doesn't pay to purchase regular gasoline solely to save $$ when it is not required for your vehicle?

Description : Is it true that higher octane gasoline is consumed more slowly by engines,and it doesn't pay to purchase regular gasoline solely to save $$ when it is not required for your vehicle?

Last Answer : No it is not true that premium gas burns slower than reg. It is a complete waste of money to use a higher grade than required by the manufacturer.

By higher octane number of SI fuel, it is meant that the fuel has (a) Higher heating value (b) Higher flash point (c) Lower volatility (d) Longer ignition delay

Description : By higher octane number of SI fuel, it is meant that the fuel has (a) Higher heating value (b) Higher flash point (c) Lower volatility (d) Longer ignition delay

Last Answer : Ans : d

Calorific value of (A) Light paraffinic fuel oils is equal to that of equivalent olefins (B) n-paraffin is lower than that of iso-paraffins of the same compounds (C) Light paraffinic fuel oils is higher than that of equivalent olefins (D) Light paraffinic fuel oils is lower than that of equivalent olefins

Description : Calorific value of (A) Light paraffinic fuel oils is equal to that of equivalent olefins (B) n-paraffin is lower than that of iso-paraffins of the same compounds (C) Light paraffinic fuel ... than that of equivalent olefins (D) Light paraffinic fuel oils is lower than that of equivalent olefins

Last Answer : (C) Light paraffinic fuel oils is higher than that of equivalent olefins

The number of layers in ISO OSI reference model is __________ a. 5 b. 7c. 6 d. 10

Description : The number of layers in ISO OSI reference model is __________ a. 5 b. 7 c. 6 d. 10

Last Answer : b. 7

Who developed standards for the OSI reference model? A. ISO B. ANSI C. IEEE D. ACM

Description : Who developed standards for the OSI reference model? A. ISO B. ANSI C. IEEE D. ACM

Last Answer : A. ISO

Who developed standards for the OSI reference model? a. ISO - International Standards Organization b. ANSI - American National Standards Institute c. IEEE - Institute of Electrical and Electronics Engineers d. ACM - Association for Computing Machinery

Description : Who developed standards for the OSI reference model? a. ISO - International Standards Organization b. ANSI - American National Standards Institute c. IEEE - Institute of Electrical and Electronics Engineers d. ACM - Association for Computing Machinery

Last Answer : a. ISO - International Standards Organization

All heat engines utilize a. lower heating value of oil b. higher heating value of oil c. net calorific value of oil d. calorific value of fuel

Description : All heat engines utilize a. lower heating value of oil b. higher heating value of oil c. net calorific value of oil d. calorific value of fuel

Last Answer : ANSWER a. lower heating value of oil

What is the quality rating for diesel fuel, similar to the octane number for petrol?

Description : What is the quality rating for diesel fuel, similar to the octane number for petrol?

Last Answer : Catane number

Which hydrocarbon molecule with eight carbons would produce the lowest octane number (i.e., the most knocking) when used as a fuel in automobile? (a) 2-Methyl-3,3-dimethylpentane (b) n-Octane (c) 2-Isopropylpentane (d) 2-Methylheptane

Description : Which hydrocarbon molecule with eight carbons would produce the lowest octane number (i.e., the most knocking) when used as a fuel in automobile? (a) 2-Methyl-3,3-dimethylpentane (b) n-Octane (c) 2-Isopropylpentane (d) 2-Methylheptane

Last Answer : n-Octane

A fuel with octane number 90 means it is as good as a mixture of : (a) 90% Isooctane + 10% n-heptane (b) 90% n-Heptane + 10% isooctane (c) 2 Litre of 90% isooctane + 2 litre of benzene(d) 2 Litre of 90% n-heptane + 2 litre of benzene

Description : A fuel with octane number 90 means it is as good as a mixture of : (a) 90% Isooctane + 10% n-heptane (b) 90% n-Heptane + 10% isooctane (c) 2 Litre of 90% isooctane + 2 litre of benzene (d) 2 Litre of 90% n-heptane + 2 litre of benzene

Last Answer : 90% Isooctane + 10% n-heptane

In any fuel, the percentage by volume of isooctane in a mixture of isooctane and n-heptane which will knock under same conditions as the fuel being tested, is called : (a) Cracking (b) Iodine number (c) Aromatization (d) Octane number

Description : In any fuel, the percentage by volume of isooctane in a mixture of isooctane and n-heptane which will knock under same conditions as the fuel being tested, is called : (a) Cracking (b) Iodine number (c) Aromatization (d) Octane number

Last Answer : Octane number

For S.I. engines fuel most preferred are a) aromatics b) paraffins c) olefins d) napthenes

Description : For S.I. engines fuel most preferred are a) aromatics b) paraffins c) olefins d) napthenes

Last Answer : Answer: a Explanation: For S.I. engines fuel most preferred are aromatics while for C.I. engines fuel most preferred are paraffins.

Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines? (A) Air filter (B) Fuel injector (C) Exhaust silencer (D) Battery

Description : Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines? (A) Air filter (B) Fuel injector (C) Exhaust silencer (D) Battery

Last Answer : Option B

Do fuel efficient cars typically use higher octane gasoline?

Description : Do fuel efficient cars typically use higher octane gasoline?

Last Answer : No, higher octane fuel is only necessary for higher performance cars. Highly efficient cars can usually use the lowest octane fuels, because they are not designed for performance.

Use of gasoline blend like tetraethyl lead in internal combustion engine a. increases the octane rating of the fuel b. allows engine to operate at higher compression ratio c. avoids auto-ignition of fuel d. all of the above

Description : Use of gasoline blend like tetraethyl lead in internal combustion engine a. increases the octane rating of the fuel b. allows engine to operate at higher compression ratio c. avoids auto-ignition of fuel d. all of the above

Last Answer : ANSWER d. all of the above

Visbreaking process is used mainly for making (A) High cetane diesel (B) High octane gasoline (C) Fuel oil (D) Smoke free kerosene

Description : Visbreaking process is used mainly for making (A) High cetane diesel (B) High octane gasoline (C) Fuel oil (D) Smoke free kerosene

Last Answer : (C) Fuel oil

Which of the following contains high content of lead? (1) Coal (2) Cooking gas (3) High octane fuel (4) Low octane fuel

Description : Which of the following contains high content of lead? (1) Coal (2) Cooking gas (3) High octane fuel (4) Low octane fuel

Last Answer : High octane fuel

A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is the partial pressure of the air in the mixture in KPa?  a. 46.8  b. 48.6  c. 84.6  d. 64.8

Description : A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is ... of the air in the mixture in KPa?  a. 46.8  b. 48.6  c. 84.6  d. 64.8

Last Answer : 84.6

The standards and labelings scheme (S&L) is one of the major thurst areas of . a) BEE b) ISEER c) HVAC d) ISO

Description : The standards and labelings scheme (S&L) is one of the major thurst areas of . a) BEE b) ISEER c) HVAC d) ISO

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Description : Manufacturers are required to put star rating labels as per the... a. ISO c. The standards and labeling program b. ASME d. RBI

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Quality management system certificate has __________ A. ISO 9001. C. ISO 9005 B. ISO 9004. D. ISO 9006

Description : Quality management system certificate has __________ A. ISO 9001. C. ISO 9005 B. ISO 9004. D. ISO 9006

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Description : What percentage of those who do those 60 mile three day walks actually go the distance in the time allotted?

Last Answer : Over here in the UK we have the annual 5k and 10k walks for cancer research that just women do not sure what these are in miles. we pay 12 pounds to enter and try to raise sponsorship too. We ... to get faster each year but its more about raising as much money as possible a very worth while cause xx

My stem's planted firmly where I am allotted. My tail is wavy and my face is quite blotted. I relay much emotion though flatly I'm spotted, And I grow half my size whenever I'm dotted. I can speak any language, yet utter no words. I'm no seed, yet I am well known among birds. But I do have a speech impediment: I can say cage but not page, aged but not wage. What am I? -Riddles

Description : My stem's planted firmly where I am allotted. My tail is wavy and my face is quite blotted. I relay much emotion though flatly I'm spotted, And I grow half my size whenever I'm dotted. I can speak any ... have a speech impediment: I can say cage but not page, aged but not wage. What am I? -Riddles

Last Answer : Music!

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Description : A person who is allotted shares or who buys shares is called a _______ of the company.

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Description : What ancient culture had the proverb that 'The Gods do not deduct from man's allotted span those hours spent in sailing'?

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How shares are allotted in IPO?

Description : How shares are allotted in IPO?

Last Answer : Pre IPO is product by Planify which brings "Private Equity for Retail investors". One can invest in companies before it get listed on Stock Market. Why invest in Pre IPO Share? When was the last time you ... an answer. Want to know more about Pre IPO shares then contact Planify at - +91 706 55 60002

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Description : A company invited application for subscription of 5,000 shares. The application were received for 6,000 shares. The shares were allotted on pro-rata basis. If X has applied for 180 shares how many shares would be allotted to him ? (A) 180 shares (B) 200 shares (C) 150 shares (D) 175 shares

Last Answer : Answer: 150 shares

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Description : A Female officer who has been allotted residential accommodation free of rent may be permitted to enjoy the rent free concession during the entire period of maternity leave The above said statement is a. True b. False

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Description : The percentage of underwriting commission on shares applied to by public is same as allotted shares devolved on underwriters.

Last Answer : FALSE

A comprehensive spending pattern: A)shows the percentages of annual family expenditures allotted to general classes of goods and services B)indicates the annual amounts spent by families for specific products within a general product class C)shows the annual discretionary income of consumers D)is used to determine the precise buying power of individuals

Description : A comprehensive spending pattern: A)shows the percentages of annual family expenditures allotted to general classes of goods and services B)indicates the annual amounts spent by families for ... discretionary income of consumers D)is used to determine the precise buying power of individuals

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During a visit to a second-grade classroom, a student teacher observed a child spending the time allotted for a worksheet either looking out the window or doodling on his paper. When the student teacher asked the child if he needed help on the assignment, he said no. When asked why he wasn’t doing it, he pointed to another student and said, “She does all her work fast and when she’s done, she gets more work.” The boy’s reaction suggests which of the following about his classroom? Options:

Description : During a visit to a second-grade classroom, a student teacher observed a child spending the time allotted for a worksheet either looking out the window or doodling on his paper. When the student ... finish work before the whole class is finished must not interrupt the students who are still working

Last Answer : B) A routine for rewarding students who finish work promptly is not in place.