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 : 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 : 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
Description : Choose the correct statement. (A) Octane number of i-octane is zero (B) Octane number of paraffins increases with increasing number of carbon atoms (C) Branched chain paraffins have higher octane ... atoms (D) The aromatics have lower octane number than naphthenes with same number of carbon atoms
Last Answer : (A) Octane number of i-octane is zero
Description : While solving an assignment problem, an activity is assigned to a resource through a square with zero opportunity cost because the objective is to a. Minimize total cost of assignment b. Reduce the cost of ... to zero c. Reduce the cost of that particular assignment to zero d. All of the above
Last Answer : c. Reduce the cost of that particular assignment to zero
Description : What is the quality rating for diesel fuel, similar to the octane number for petrol?
Last Answer : Catane number
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
Last Answer : Answer: a Explanation: None.
Description : The normal heptane(C7H16) is given a rating of ____________ octane number. a) 0 b) 50 c) 100 d) 120
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
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
Description : Ignition quality of diesel is expressed by a. octane number b. cetane number c. calorific value d. carbon content
Last Answer : ANSWER b. cetane number
Description : Ignition quality of petrol is expressed by a. Octane number b. cetane number c. calorific value d. self-ignition temperature
Last Answer : ANSWER a. 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 : (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 : 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 : 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 : Pick out the wrong statement. (A) Lower boiling paraffins have higher octane number than higher paraffins (B) Dehydrogenation of naphthenes to aromatics is a desirable reaction in reforming ... is dearomatised kerosene (D) Catalyst used in catalytic reforming is platinum on silica-alumina base
Last Answer : (C) The most ideal feedstock for thermal reforming is dearomatised kerosene
Description : Research octane number refers to the (A) Low octane number motor fuels (B) High octane number motor fuels (C) High octane number aviation fuels (D) Unleaded motor fuels
Last Answer : (D) Unleaded motor fuels
Description : Straight run petrol as compared to methyl/ethyl alcohol has (A) Lower calorific value (B) Lower octane number (C) Higher specific gravity (D) Higher ignition temperature
Last Answer : (B) Lower octane number
Description : Octane number of gasoline is a measure of its (A) Resistance to knock (B) Ignition delay (C) Ignition temperature (D) Smoke point
Last Answer : (A) Resistance to knock
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 : 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
Description : Which of the following has the highest octane number? (A) Aromatics (B) i-paraffins (C) Naphthenes (D) Olefins
Last Answer : (A) Aromatics
Description : The colour of gasoline is an indication of its (A) Octane number (B) Lead susceptibility (C) Gum forming tendency & thoroughness of refining (D) None of these
Last Answer : (C) Gum forming tendency & thoroughness of refining
Description : __________ determination is not a very significant and important test for gasoline. (A) Gum & sulphur content (B) Viscosity (C) Octane number (D) Reid vapor pressure
Last Answer : (B) Viscosity
Description : Paraffin base crude oil as compared to asphalt base crude gives (A) Higher yield of straight run gasoline (B) Higher octane number gasoline (C) Lower viscosity index lube oil (D) Poorer yield of lube oil
Last Answer : (A) Higher yield of straight run gasoline
Description : Phenols are added in gasoline to (A) Improve the octane number (B) Act as an antioxidant (C) Reduce its viscosity (D) Increase its pour point
Last Answer : (B) Act as an antioxidant
Description : Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to (A) Increase the yield of ... coke formation (C) Enhance the octane number of gasoline (D) Reduce gum content in gasoline
Last Answer : (B) Suppress coke formation
Description : Octane number (unleaded) of reformed gasoline may be upto (A) 60 (B) 70 (C) 80 (D) 90
Last Answer : (D) 90
Description : The octane number of aviation gasoline may be (A) 79 (B) 87 (C) 97 (D) > 100
Last Answer : (D) > 100
Description : Which of the following gasoline (unleaded) has the least octane number? (A) Catalytically cracked gasoline (B) Straight run gasoline (C) Catalytically reformed gasoline (D) Polymer gasoline
Last Answer : (B) Straight run gasoline
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 : Aromatics have the highest __________ of all the hydrocarbons of same carbon atoms. (A) Smoke point (B) Octane number (C) Cetane number (D) Viscosity
Last Answer : (B) Octane number
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)
Description : Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic (A) Cracking (B) Polymerisation (C) Reforming (D) Isomerisation
Last Answer : (C) Reforming
Description : Octane number (unleaded) of gasoline produced by isomerisation of butane may be about (A) 45 (B) 55 (C) 70 (D) 90
Last Answer : (C) 70
Description : Higher pressure in the reforming reactor (A) Increases coke formation (B) Increases the rate of reaction (C) Produces high octane number gasoline (D) None of these
Last Answer : (D) None of these
Description : Choose the correct statement regarding thermal cracking. (A) Moderate changes in operating temperature does not change the depth of cracking (B) Increased residence time results in the decreased ... of lighter hydrocarbons are more (D) Greater depth of cracking gives lower octane number gasoline
Last Answer : (D) Greater depth of cracking gives lower octane number gasoline
Description : Octane number of n-heptane is assumed to be (A) 100 (B) 0 (C) 70 (D) ∞
Last Answer : (B) 0
Description : The amount of tetraethyl lead added to improve the octane number of motor gasoline is around __________ c.c per gallon of petrol. (A) 3 (B) 300 (C) 3000 (D) 1000
Last Answer : (A) 3
Description : Octane number of gasoline produced by two stage fluidised catalytic cracking process is (A) 80 (B) 87 (C) 92 (D) 97
Last Answer : (D) 97
Description : Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil (A) Gives higher yield of petrol (B) Lower octane number of petrol (C) Higher sulphur content in the product (D) Higher gum forming material in petro
Last Answer : (A) Gives higher yield of petrol
Description : Presence of aromatics in (A) Diesel increases its cetane number (B) Kerosene increases its smoke point (C) Petrol increases its octane number (D) All (A), (B) and (C)
Last Answer : (C) Petrol increases its octane number
Description : Pick out the correct statement pertaining to catalytic cracking. (A) With increase in the reactor pressure, octane number of gasoline decreases (B) With increase in the reactor temperature, gasoline yield decreases for a given ... with increase in the catalyst to oil ratio (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 : 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 : Power alcohol as compared to straight run gasoline has lower (A) Calorific value (B) Octane number (C) Specific gravity (D) Viscosity
Last Answer : (A) 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