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
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
Description : Octane number of n-heptane is assumed to be (A) 100 (B) 0 (C) 70 (D) ∞
Last Answer : (B) 0
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.
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
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
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
Description : The normal heptane(C7H16) is given a rating of ____________ octane number. a) 0 b) 50 c) 100 d) 120
Last Answer : Answer: a Explanation: None.
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
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
Description : 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
Last Answer : (A) Water-hydrochloric acid
Description : 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
Last Answer : 10% heptane + 90% isooctane
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
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.
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
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.
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.
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
Description : The octane number of zero is assigned to?
Description : Which of the following alkanes will have the lowest boiling point? (a) n-Heptane (b) Isopentane (c) n-Hexane (d) Neopentane
Last Answer : Neopentane
Description : The quality of petrol is expressed in terms of – (1) Cetane number (2) Gold number (3) Octane number (4) Added unlead compounds
Last Answer : (3) Octane number Explanation: Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less ... premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine.
Description : The quality of petrol is expressed in terms of (1) Cetane number (2) Gold number (3) Octane number (4) Added unlead compounds
Description : How many carbon atoms are present in the alkane whose IUPAC name is 2,2,4-trimethylpentane?
Last Answer : Five
Description : Mercaptans are (A) Low boiling sulphur compounds (B) Added in LPG cylinders to detect gas leakage by its smell (C) Undesirable in petrol, as they reduce its octane number (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : In catalytic cracking, the (A) Gasoline obtained has a very low octane number (B) Pressure & temperature is very high (C) Gasoline obtained has very high aromatic content (D) Gasoline obtained has very high amount of gum forming compounds
Last Answer : (C) Gasoline obtained has very high aromatic content
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
Description : How many isomers are possible for heptane? (a) 9 (b) 10 (c) 11 (d) 12
Last Answer : 9
Description : Which of the following alkanes will have the highest boiling point? (a) n-Octane (b) Isopentane (c) n-Butane (d) Neopentane
Description : Which of the following is NOT an aliphatic hydrocarbon? w) n-octane x) propylene y) n-tridecane z) benzene
Last Answer : ANSWER: Z -- BENZENE
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.
Last Answer : Iso-octane permits highest compression without causing knocking
Description : The octane number of aviation gasoline may be (A) 79 (B) 87 (C) 97 (D) > 100
Last Answer : (D) > 100
Description : Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is (A) More than 100 (B) Round about 100 (C) Between 50 and 100 (D) Less than 25
Last Answer : (A) More than 100
Description : Octane number of 2, 2, 4 - trimethyl pentane is (A) 0 (B) 100 (C) In between 0 and 100 (D) More than 100
Last Answer : (B) 100
Description : Octane of natural gas is a) 60-80 b) 80-100 c) >100 d)
Last Answer : Answer: c Explanation: The octane number of natural gas is always >
Description : Octane numbers of motor gasoline used in India and America are respectively (A) 87 & 94 (B) 94 & 87 (C) 94 & 100 (D) 83 & 100
Last Answer : (A) 87 & 94
Description : A(n) __________ is an independent business that sells complementary products of several producers in assigned territories and is compensated through commissions. A)industrial distributor B)production agent C)wholesaler D)manufacturers' agent E)producer
Last Answer : D)manufacturers' agent
Description : The degree of unsaturation of a fat can be determined by means of its (a) Iodine number (b) Octane number (c) Saponification number (d) Melting point
Last Answer : Iodine number
Description : Octane number is related to (a) Gasoline (b) Kerosene oil (c) Diesel oil (d) Lubricating oi
Last Answer : Gasoline
Description : Which among the following is used as a catalyst in the production of high octane fuels? (1) HNO3 (2) H2SO4 (3) HCl (4) HF
Last Answer : (2) H2SO4 Explanation: Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of highoctane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
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
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
Description : Which among the following is used as a catalyst in the production of high octane fuels? (1) HNO3 (2)H2 SO4 (3) HCl (4) HF
Last Answer : H2 SO4
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
Description : What is the problem with N and S compounds in fuel ?
Last Answer : The substances we use as fuel release CO 2 and water vapor into the air. The amount of CO 2 in the air does not change much as the plant absorbs CO 2. However, when S and N compounds are mixed in ... of SO₂, SO 3 and NO 2 . These by-products cause acid rain which is a threat to the environment
Description : Consider the three isomeric alkanes n-hexane, 2,3-dimethylbutane, and 2- methylpentane. Which of the following correctly lists these compounds in order of increasing boiling point? (a) 2,3-dimethylbutane < 2- ... < 2, 3-dimethylbutane < n-hexane (d) n-hexane < 2-methylpentane < 2,3-dimethylbutane
Last Answer : 2,3-dimethylbutane < 2-methylpentane < n-hexane
Description : Which of the following compounds does not dissolve in concentrated H2SO4 on warming? (a) n-Hexane (b) Diethyl ether (c) 1-Butene (d) Aniline
Last Answer : n-Hexane
Description : Which of the following pairs of compounds could NOT be used to create a buffer solution? Would it be: w) HCL and NaCl (read: H - C - L and N - A - C - L) x) HCN and NaCN (read: H - C - N and N - A - C - N) y) NH3 ... - H - 4 - C - L) z) HNO2 and NaNO2 (read: H - N - O -2 and N - A - N - O - 2)
Last Answer : ANSWER: W -- HCL AND NaCl (read: H - C - L and N - A - C - L)
Description : What is the quality rating for diesel fuel, similar to the octane number for petrol?
Last Answer : Catane number
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