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 : 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
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
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 : 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 : 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
Description : Octane number of n-heptane is assumed to be (A) 100 (B) 0 (C) 70 (D) ∞
Last Answer : (B) 0
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 : 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 : 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 : 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 : 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 : 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 : 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 : 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 : 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 : 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 : The temperature of interior surface of the cylinder wall in normal operation is not allowed to exceed a. 80 C b. 120 C c. 180 C d. 240 C
Last Answer : ANSWER c. 180 C
Description : The general rule for rating refrigeration systems (excepting for CO2 system) is to approximate following h.p. per ton of Refrigeration (a) 0.1 to 0.5 h.p. per ton of refrigeration (b) 0.5 to 0.8 h.p. per ... (c) 1 to 2 h.p. per ton of refrigeration (d) 2 to 5 h.p. per ton of refrigeration
Last Answer : Ans: c
Description : Rating of a domestic refrigerator is of the order of (a) 0.1 ton (b) 5 tons (c) 10 tons (d) 40 tons
Last Answer : Ans: a
Description : The economical diesel fuels have got octane rating varying from a) 30 to 50 b) 30 to 60 c) 20 to 30 d) 25 to 30
Last Answer : b) 30 to 60
Description : If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressorrequired will be (a) same (b) more (c) less (d) more/less depending on rating
Last Answer : Ans: b
Description : If the performance of diesel engine of different sizes, cylinder dimensions and power rating are to be compared, which of the following parameters can be used for such comparison? (a) Swept volume (b) Air fuel ratio (c) Specific brake fuel consumption (d) Volumetric efficiency
Last Answer : Ans :c
Description : For the best results of efficient combustion, high speed diesel engines need an approximate cetane number of a. 100 b. 50 c. 10 d. 5
Last Answer : ANSWER b. 50
Description : Removal of air from the pipeline is termed as ____________ in injection system. a) bleeding b) wound c) sweating d) none of the mentioned
Last Answer : Answer: a Explanation: Generally, the removal of air from the pipeline is termed as bleeding in injection system.
Description : What is the quality rating for diesel fuel, similar to the octane number for petrol?
Last Answer : Catane number
Description : Can using a petrol with a higher octane rating than recommended provide any benefits?
Last Answer : Using a petrol with a higher octane rating than recommended may provide improved performance in some high-performance or high-compression engines, but generally does not provide any significant benefits in most engines.
Description : What happens if you use a petrol with a lower octane rating than recommended for your engine?
Last Answer : Using a petrol with a lower octane rating than recommended for your engine can cause knocking or pinging during combustion, which can damage the engine over time.
Description : How is the octane rating of petrol determined?
Last Answer : The octane rating of petrol is determined through a test that compares the fuel's resistance to knocking to that of a reference fuel, typically iso-octane and n-heptane.
Description : What is the octane rating of petrol?
Last Answer : The octane rating of petrol is a measure of its resistance to knocking or pinging during combustion, and is typically between 87 and 93 in the United States.
Description : What is octane rating?
Last Answer : Octane rating is a measure of a fuel's ability to resist "knocking" or detonation in an engine.
Last Answer : Octane rating is a measure of a fuel's ability to resist "knocking" or detonation in an engine. The higher the octane rating, the more resistant the fuel is to knocking.
Last Answer : Octane rating is a measure of a fuel's ability to resist engine knocking or detonation, which can cause damage to an engine. The higher the octane rating, the more resistant the fuel is to knocking.
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 : The next higher homologue of C6H14 is - (1) C6H14 (2) C7H12 (3) C6H12 (4) C7H16
Last Answer : (4) C7H16 Explanation: In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. ... CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
Description : The next higher homologue of C6H14 is (1) C7H14 (2) C7H12 (3) C6H12 (4) C7H16
Last Answer : C7H16
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 : Normal serum insulin level varies between (A) 4–25 µU/ml (B) 25–50 µU/ml (C) 70–90 µU/ml (D) 100–120 µU /ml
Last Answer : Answer : A
Description : What is the average 'Intelligence Quotient (IQ) of normal' persons? (1) 100 to 120 (2) 90 to 110 (3) 70 to 130 (4) 50 to 100
Last Answer : (2) 90 to 110 Explanation: IQ is a number meant to measure people cognitive abilities (intelligence) in relation to their age group. An LQ between 90 and 110 is considered average; over 120, superior.
Description : Normal fasting blood sugar level per 100 ml. of blood in man is - (1) 30 - 50 mg (2) 50 - 70 mg (3) 80 -100 mg (4) 120 -140 mg
Last Answer : (3) 80 -100 mg Explanation: The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. Glucose levels are usually lowest in the ... (termed the fasting level"), and rise after meals for an hour or two by a few millimolar.
Description : Normal fasting blood sugar level per 100 ml. of blood in man is (1) 30 - 50 mg (2) 50 - 70 mg (3) 80 -100 mg (4) 120 -140 mg
Last Answer : 80 -100 mg
Description : One tonrefrigeration corresponds to (a) 50 kcal/min (b) 50 kcal/kr (c) 80 kcal/min (d) 80 kcal/hr
Description : A 40 kW engine has a mechanical efficiency of 80 %. If the frictional power is assumed to be constant with load, what is the approximate value of the mechanical efficiency at 50 % of the rated load? (a) 45% (b) 55 % (c) 65% (d) 75%