Gasoline with an octane number of 90 is equivalent in knocking characteristics to a mixture of heptane and isooctane of the following composition : (a) 20% heptane + 80% isooctane (b) 90% heptane + 10% isooctane (c) 80% heptane + 20% isooctane (d) 10% heptane + 90% isooctane

Gasoline with an octane number of 90 is equivalent in knocking
characteristics to a mixture of heptane and isooctane of the following composition
:
(a) 20% heptane + 80% isooctane
(b) 90% heptane + 10% isooctane
(c) 80% heptane + 20% isooctane
(d) 10% heptane + 90% isooctane
by

1 Answer

Answer :

10% heptane + 90% isooctane
by

Related questions

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

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.

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

The octane rating of gasoline provides information on(a) its antiknock properties(b) its ignition properties(c) its percentage proportion of octane(d) its percentage content of isooctane

Description : The octane rating of gasoline provides information on (a) its antiknock properties (b) its ignition properties (c) its percentage proportion of octane (d) its percentage content of isooctane

Last Answer : its antiknock properties

Gasohol is a mixture of a) 90% ethanol + 10% gasoline b) 10% ethanol + 90% gasoline c) 40% ethanol + 60% gasoline d) 50% ethanol + 50% gasoline

Description : Gasohol is a mixture of a) 90% ethanol + 10% gasoline b) 10% ethanol + 90% gasoline c) 40% ethanol + 60% gasoline d) 50% ethanol + 50% gasoline

Last Answer : Answer: b Explanation: 10% ethanol + 90% gasoline makes gashol.

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.

The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n octane into pure compounds each at 1 atm is (A) -2 RT ln 0.5 (B) -RT ln 0.5 (C) 0.5 RT (D) 2 RT

Description : The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n octane into pure compounds each at 1 atm is (A) -2 RT ln 0.5 (B) -RT ln 0.5 (C) 0.5 RT (D) 2 RT

Last Answer : (B) -RT ln 0.5

Approximately how many businesses content marketing is used? A. 20% to 30% B. 40% to 50% C. 60% to 70% D. 80% to 90%

Description : Approximately how many businesses content marketing is used? A. 20% to 30% B. 40% to 50% C. 60% to 70% D. 80% to 90%

Last Answer : D. 80% to 90%

Higher plant efficiency up to______ over the entire load range. a. 30%-50% b. 20%-40% c. 60%-90% d. 50%-80%

Description : Higher plant efficiency up to______ over the entire load range. a. 30%-50% b. 20%-40% c. 60%-90% d. 50%-80%

Last Answer : a. 30%-50%

Contribution of albumin to colloid osmotic pressure of plasma is about (A) 10% (B) 50% (C) 80% (D) 90%

Description : Contribution of albumin to colloid osmotic pressure of plasma is about (A) 10% (B) 50% (C) 80% (D) 90%

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More than …. Farmers depend upon animal drawn implements. a. 80%. c) 40% b. 90%. d) 10%.

Description : More than …. Farmers depend upon animal drawn implements. a. 80%. c) 40% b. 90%. d) 10%.

Last Answer : 80%.

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.

Which of the following compounds is assigned the Octane Number of 100 : (a) n-Heptane (b) 2,3,3-Trimethylpentane (c) n-Octane (d) 2,2,4-Trimethylpentane

Description : Which of the following compounds is assigned the Octane Number of 100 : (a) n-Heptane (b) 2,3,3-Trimethylpentane (c) n-Octane (d) 2,2,4-Trimethylpentane

Last Answer : 2,2,4-Trimethylpentane

Which of the following compounds is assigned the Octane Number of zero : (a) n-Octane (b) 2,3,3-Trimethylpentane (c) n-Heptane (d) 2,2,4-Trimethylpentane

Description : Which of the following compounds is assigned the Octane Number of zero : (a) n-Octane (b) 2,3,3-Trimethylpentane (c) n-Heptane (d) 2,2,4-Trimethylpentane

Last Answer : n-Heptane

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

Formalin is (a) 10% solution of formaldehyde in water (b) 20% solution of formaldehyde in water (c) 40% solution of formaldehyde in water (d) 80% solution of formaldehyde in water

Description : Formalin is (a) 10% solution of formaldehyde in water (b) 20% solution of formaldehyde in water (c) 40% solution of formaldehyde in water (d) 80% solution of formaldehyde in water

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Octane number (unleaded) of reformed gasoline may be upto (A) 60 (B) 70 (C) 80 (D) 90

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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

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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

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The atmosphere of moon consists of-------? A. 90% Hydrogen, 10% Nitrogen B. 80%Nitrogen, 20% Hydrogen C. 60% Nitrogen, 40%inert gases (Answer) D. None

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If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA a) 30% b) 10% c) 90% d) 40%

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Last Answer : Answer: a Explanation: None.

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Last Answer : (B) 0

Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of (A) 90% tungsten carbide and 10% cobalt (B) 70% aluminium oxide & 30% silica (C) 30% nickel, 15% chromium & 55% tungsten (D) 65% tungsten & 35% zirconium

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Last Answer : Option A

The total RNA in cell tRNA constitutes (A) 1–10% (B) 10–20% (C) 30–50% (D) 50–80%

Description : The total RNA in cell tRNA constitutes (A) 1–10% (B) 10–20% (C) 30–50% (D) 50–80%

Last Answer : Answer : B

Constantan is an alloy of (A) Cu (55%) & Sn (45%) (B) Cu (55%) & Ni (45%) (C) Pt (95%) & Rh (10%) (D) Fe (80%) & Ni (20%)

Description : Constantan is an alloy of (A) Cu (55%) & Sn (45%) (B) Cu (55%) & Ni (45%) (C) Pt (95%) & Rh (10%) (D) Fe (80%) & Ni (20%)

Last Answer : (B) Cu (55%) & Ni (45%)

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 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

Which of the following binary systems is an example of a maximum boiling azeotrope? (A) Water-hydrochloric acid (B) Acetone-carbon disulphide (C) Water-ethyl alcohol (D) n-heptane-n-octane

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Last Answer : (A) Water-hydrochloric acid

A sample of natural gas containing 80% methane (CH4 ) and rest nitrogen (N2 ) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is (A) CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60 (B) CO2 : 7.42, CO : 1.86, O2 : 4.64, N2 :86.02 (C) CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2 :72.06 (D) CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

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Last Answer : (B) CO2 : 7.42, CO : 1.86, O2 : 4.64, N2 :86.02

The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be (A) y (B) 0.95 y (C) 1.05 y (D) 1.8 y

Description : The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be (A) y (B) 0.95 y (C) 1.05 y (D) 1.8 y

Last Answer : (A) y

Bronze is an alloy of copper, zinc , and tin having composition (A) 60% - 30% - 10% (B) 70% - 20% - 10% (C) 88% - 2% - 10% (D) 50% -30% - 20%

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Last Answer : (C) 88% - 2% - 10%

A mixture of 90 kg of rava and sugar contains 90% of sugar. The new mixture is formed by adding 30 kg of sugar. What is the percentage of sugar in the new mixture? a) 45 1/2 b) 60 1/5 c) 45 1/2 d) 92 1/2 e) 98 1/2

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Last Answer : Answer: D 90 kg = 81 kg sugar 9 kg rava Adding = 30 kg sugar Total = 111kg sugar 9kg rava (new)  111/120 × 100 = 92.5 =92 1 /2

The ratio of pure gold in 18 carat gold is (1) 60% (2) 75% (3) 80% (4) 90%

Description : The ratio of pure gold in 18 carat gold is (1) 60% (2) 75% (3) 80% (4) 90%

Last Answer : (2) 75% Explanation: There are various grades of gold purity, determined by the ratio of their alloy composition and rated by a karat system. Typical karat purities range from 10 karats to ... balance between gold purity and strength. Brilliance offers a variety of exquisite 18 karat gold jewelry.

The ratio of pure gold in 18 carat gold is : (1) 60% (2) 75% (3) 80% (4) 90%

Description : The ratio of pure gold in 18 carat gold is : (1) 60% (2) 75% (3) 80% (4) 90%

Last Answer : 75%

Octane number is related to (a) Gasoline (b) Kerosene oil (c) Diesel oil (d) Lubricating oi

Description : Octane number is related to (a) Gasoline (b) Kerosene oil (c) Diesel oil (d) Lubricating oi

Last Answer : Gasoline

Which of the following methods can be used to increase the octane rating of gasoline? (a) Adding branched-chain alkanes (b) Adding tetraethyllead (c) Adding aromatic hydrocarbons (d) All of these

Description : Which of the following methods can be used to increase the octane rating of gasoline? (a) Adding branched-chain alkanes (b) Adding tetraethyllead (c) Adding aromatic hydrocarbons (d) All of these

Last Answer : All of these

In 1 kg mixture of sand and iron, 20% is iron. How much sand should be added so that the proportion of iron becomes 10%? a) 1 kg b) 200 gms c) 800 gms d) 1.8 kg e) None of these

Description : In 1 kg mixture of sand and iron, 20% is iron. How much sand should be added so that the proportion of iron becomes 10%? a) 1 kg b) 200 gms c) 800 gms d) 1.8 kg e) None of these

Last Answer : Answer: A If we add x grams of sand, the total amount would be 1,000 + x grams of mixture and we need 200 grams of iron to be 10% of that: 0.1(1,000 + x) = 200 --> x = 1,000. 

Find the single discount equivalent to a series discount of 40%, 20% and 10%

Description : Find the single discount equivalent to a series discount of 40%, 20% and 10%

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A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m￾xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture? (A) The mixture exhibits an azeotrope at 101.3 kPa (B) The composition of the mixture, in percent by volume is: o-xylene 30, p￾xylene 60. and m-xylene 10 (C) The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10 (D) The mixture contain optical isomers

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Last Answer : (A) The mixture exhibits an azeotrope at 101.3 kPa

The product of 60% of a number and 125% of another number is what percent of the product of the original numbers? 1 : 90% 2 : 75% 3 : 80% 4 : 100% 5 : None of these

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Last Answer : 2 : 75%

In a morse test for a 2 cylinder, 2 S SI engine, the brake power was 9 kW. Whereas the brake power of individual cylinders with spark cut off were 4.25 kW and 3.75 kW. The mecheffic of the engine is (a) 90% (b) 80% (c) 45.5% (d) 52.5%

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Last Answer : Ans :a

How much of total production of oil is produced by Dhulian and Balkassar oil fields? A. 75% B. 80% C. 90% D. 95%

Description : How much of total production of oil is produced by Dhulian and Balkassar oil fields? A. 75% B. 80% C. 90% D. 95%

Last Answer : ANSWER: C

How much of total production of oil is produced by Dhulian and Balkassar oil fields? A. 75% B. 80% C. 90% D. 95%

Description : How much of total production of oil is produced by Dhulian and Balkassar oil fields? A. 75% B. 80% C. 90% D. 95%

Last Answer : ANSWER: C

How Much of the total area cultivated is under Irrigation System? A. 60% B. 70% C. 80% D. 90%

Description : How Much of the total area cultivated is under Irrigation System? A. 60% B. 70% C. 80% D. 90%

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Which of the following percentage of foreign exchange earnings can be credited to the EEFC account? A. 80% B. 90% C. 75% D. 95% E. 100%

Description : Which of the following percentage of foreign exchange earnings can be credited to the EEFC account? A. 80% B. 90% C. 75% D. 95% E. 100%

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