A good lubricant should have high (A) Viscosity index (B) Volatility (C) Pour point (D) None of these

A good lubricant should have high
(A) Viscosity index
(B) Volatility
(C) Pour point
(D) None of these
by

1 Answer

Answer :

(A) Viscosity index
by

Related questions

Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has (A) High pour point and low smoke point (B) Low viscosity index (C) High self-ignition temperature (D) All (A), (B) and (C)

Description : Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has (A) High pour point and low smoke point (B) Low viscosity index (C) High self-ignition temperature (D) All (A), (B) and (C)

Last Answer : (B) Low viscosity index

Paraffins are desirable in lubricating oil, as it has got high (A) Viscosity (B) Viscosity index (C) Smoke point (D) Pour poin

Description : Paraffins are desirable in lubricating oil, as it has got high (A) Viscosity (B) Viscosity index (C) Smoke point (D) Pour poin

Last Answer : (C) Smoke point

Define cloud point and viscosity index of a lubricant

Description : Define cloud point and viscosity index of a lubricant

Last Answer : Cloud point: Cloud point indicates the temperature at which the oil becomes cloudy in appearance, due to separation of wax. Viscosity Index: The rate of change of viscosity of a liquid (Oil) with the change of temperature is known as viscosity index.

Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to (A) Reduce its viscosity (B) Increase its viscosity (C) Reduce the variation in its viscosity with temperature(D) Increase the variation in its viscosity with temperature

Description : Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to (A) Reduce its viscosity (B) Increase its viscosity (C) Reduce the variation in its viscosity with temperature (D) Increase the variation in its viscosity with temperature

Last Answer : (C) Reduce the variation in its viscosity with temperature

Define following: i) Oiliness ii) Volatility iii) Cloud point iv)Pour point

Description : Define following: i) Oiliness ii) Volatility iii) Cloud point iv)Pour point

Last Answer : i) Oiliness: -It is defined as the power of an oil to maintain a continuous film under pressure while used a lubricant. ii) Volatility: - Volatility of oil is its tendency to vaporize with the ... iv) Pour point: It is defined as the temperature at which oil ceases to flow or pour on cooling

Fuel oil is subjected to visbreaking to reduce its (A) Pour point (B) Viscosity (C) Pressure drop on pumping (D) All (A), (B) and (C

Description : Fuel oil is subjected to visbreaking to reduce its (A) Pour point (B) Viscosity (C) Pressure drop on pumping (D) All (A), (B) and (C

Last Answer : (D) All (A), (B) and (C

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

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

In extractive distillation, solvent is (A) Added to alter the relative volatility of the mixture (B) Of high volatility (C) Present in overhead stream (D) Of high viscosity to give high tray efficiency

Description : In extractive distillation, solvent is (A) Added to alter the relative volatility of the mixture (B) Of high volatility (C) Present in overhead stream (D) Of high viscosity to give high tray efficiency

Last Answer : (A) Added to alter the relative volatility of the mixture

Entrainer used in Azeotropic distillation should (A) Form a low boiling azeotrope with one of the constituents of the mixture (B) Form a new azeotrope of low relative volatility with one of the constituents of the mixture (C) Have high latent heat of vaporisation (D) Have high viscosity to provide high tray efficiency

Description : Entrainer used in Azeotropic distillation should (A) Form a low boiling azeotrope with one of the constituents of the mixture (B) Form a new azeotrope of low relative volatility with one of the ... (C) Have high latent heat of vaporisation (D) Have high viscosity to provide high tray efficiency

Last Answer : (A) Form a low boiling azeotrope with one of the constituents of the mixture

Smoke volatility index is equal to smoke point plus (A) 0.42 × (% distilled at 204°C) (B) 5 mm (C) 0.84 × (% distilled at 204°C) (D) 10 mm approximately

Description : Smoke volatility index is equal to smoke point plus (A) 0.42 × (% distilled at 204°C) (B) 5 mm (C) 0.84 × (% distilled at 204°C) (D) 10 mm approximately

Last Answer : (A) 0.42 × (% distilled at 204°C)

In cold countries ethylene glycol is added to water in car radiators. This helps to (a) Reduce the viscosity (b) Make water a better lubricant (c) Lower the freezing point (d) Lower the boiling poin

Description : In cold countries ethylene glycol is added to water in car radiators. This helps to (a) Reduce the viscosity (b) Make water a better lubricant (c) Lower the freezing point (d) Lower the boiling poin

Last Answer : Lower the freezing point

The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. all of the above

Description : The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. all of the above

Last Answer : ANSWER d. all of the above

The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. All of the above

Description : The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. All of the above

Last Answer : ANSWER d. all of the above

Explain the following properties i) Pour point ii) Viscosity iii) Ignition quality iv) Fire point

Description : Explain the following properties i) Pour point ii) Viscosity iii) Ignition quality iv) Fire point

Last Answer : i. Pour point: Pour point is the temperature below which the entire mass of fuel, solid or liquid together, freeze and thus cause flow of fuel impossible. Pour point is usually 5 to 10 °C below ... is the temperature at which the flash will sustain itself as a steady flame for at least five seconds.

Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their (A) Viscosity (B) Density (C) Solubility (D) Relative volatility

Description : Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their (A) Viscosity (B) Density (C) Solubility (D) Relative volatility

Last Answer : (C) Solubility

Satisfactory hydrodynamic film in a journal bearing is formed when (a) Journal speed is low; unit pressure on the bearing is high and viscosity of lubricant used is low [IES-2006] (b) Journal speed is low; unit pressure on the bearing is low and viscosity of lubricant used is low (c) Journal speed is high; unit pressure on the bearing is high and viscosity of lubricant used is high (d) Appropriate combination of journal speed, unit pressure on bearing and lubricant viscosity exists resulting in low coefficient of friction

Description : Satisfactory hydrodynamic film in a journal bearing is formed when (a) Journal speed is low; unit pressure on the bearing is high and viscosity of lubricant used is low [IES-2006] ... journal speed, unit pressure on bearing and lubricant viscosity exists resulting in low coefficient of friction

Last Answer : (c) Journal speed is high; unit pressure on the bearing is high and viscosity of lubricant used is high

A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) (A) 0.01 (B) 0.1 (C) 1 (D) 10

Description : A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) (A) 0.01 (B) 0.1 (C) 1 (D) 10

Last Answer : (B) 0.1

The reciprocal of stripping factor is termed as (A) Selectivity index (B) Relative volatility (C) Absorption factor (D) Murphree efficiency

Description : The reciprocal of stripping factor is termed as (A) Selectivity index (B) Relative volatility (C) Absorption factor (D) Murphree efficiency

Last Answer : (C) Absorption factor

V.U.C.A. is an abbreviation for.. A. Volatility, uncertainty, complexity and ambiguity B. Viscosity, uncertainty, complexity and ambiguity C. Volatility, uncertainty, competition and ambiguity D. None of these options is correct

Description : V.U.C.A. is an abbreviation for.. A. Volatility, uncertainty, complexity and ambiguity B. Viscosity, uncertainty, complexity and ambiguity C. Volatility, uncertainty, competition and ambiguity D. None of these options is correct

Last Answer : Volatility, uncertainty, complexity and ambiguity

V.U.C.A. is an abbreviation for.. A. Volatility, uncertainty, complexity and ambiguity B. Viscosity, uncertainty, complexity and ambiguity C. Volatility, uncertainty, competition and ambiguity D. None of these options is correct.

Description : V.U.C.A. is an abbreviation for.. A. Volatility, uncertainty, complexity and ambiguity B. Viscosity, uncertainty, complexity and ambiguity C. Volatility, uncertainty, competition and ambiguity D. None of these options is correct.

Last Answer : Volatility, uncertainty, complexity and ambiguity

Consider the following statements: [IES 2007] For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is- 1. Proportional to the area of contact 2. Proportional to the viscosity of lubricant 3. Proportional to the speed of rotation 4. Independent of the pressure Which of the statements given above are correct? (a) 1, 2, 3 and 4 (b) 1 and 4 only (c) 2, 3 and 4 only (d) 2 and 3 only

Description : Consider the following statements: [IES 2007] For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is- 1. Proportional to the area of contact 2. Proportional to the viscosity of lubricant 3. ... 4 (b) 1 and 4 only (c) 2, 3 and 4 only (d) 2 and 3 only

Last Answer : (a) 1, 2, 3 and 4

In a journal bearings, the radius of the friction circle increases with the increase in- [IES-1997] (a) Load (b) Radius of the journal (c) Speed of the journal (d) Viscosity of the lubricant

Description : In a journal bearings, the radius of the friction circle increases with the increase in- [IES-1997] (a) Load (b) Radius of the journal (c) Speed of the journal (d) Viscosity of the lubricant

Last Answer : (b) Radius of the journal

Which one is preferred for aircraft engine? (A) High viscosity index lube oil (B) Low viscosity index lube oil (C) High freezing point aviation fuel (D) None of these

Description : Which one is preferred for aircraft engine? (A) High viscosity index lube oil (B) Low viscosity index lube oil (C) High freezing point aviation fuel (D) None of these

Last Answer : (A) High viscosity index lube oil

A multigrade lubricating oil means an oil having high (A) Viscosity index (B) Viscosity (C) Aniline point (D) Flash point

Description : A multigrade lubricating oil means an oil having high (A) Viscosity index (B) Viscosity (C) Aniline point (D) Flash point

Last Answer : (A) Viscosity index

Hydrofining is the most recent and effective method for the (A) Removal of sulphur (B) Improvement of smoke point (C) Reduction of breathing loss (D) Improvement of viscosity index

Description : Hydrofining is the most recent and effective method for the (A) Removal of sulphur (B) Improvement of smoke point (C) Reduction of breathing loss (D) Improvement of viscosity index

Last Answer : (A) Removal of sulphur

Viscosity index of a lubricating oil (A) Is the measure of its flash point (B) Is the measure of variation of viscosity with temperature (C) Should be low (D) None of these

Description : Viscosity index of a lubricating oil (A) Is the measure of its flash point (B) Is the measure of variation of viscosity with temperature (C) Should be low (D) None of these

Last Answer : (B) Is the measure of variation of viscosity with temperature

The intensive properties are (A) Molar volume, density, viscosity and boiling point (B) Refractive index and surface tension (C) Both (A) and (B) (D) None of these

Description : The intensive properties are (A) Molar volume, density, viscosity and boiling point (B) Refractive index and surface tension (C) Both (A) and (B) (D) None of these

Last Answer : (C) Both (A) and (B)

. Pick out the wrong statement. (A) Multigrade lubricating oils have high viscosity index (B) Paraffinic oil has very high viscosity index (C) Naphthenic oil has very low viscosity index (D) High viscosity index means a large change in viscosity with change in temperature

Description : . Pick out the wrong statement. (A) Multigrade lubricating oils have high viscosity index (B) Paraffinic oil has very high viscosity index (C) Naphthenic oil has very low viscosity index (D) High viscosity index means a large change in viscosity with change in temperature

Last Answer : (D) High viscosity index means a large change in viscosity with change in temperature

Pick out the wrong statement. (A) Pensky-Marten apparatus is used for determining flash points above 50°C (B) Characterisation factor of paraffinic crude oil is more than 12 (C) Abel apparatus is used for determining flash points below 50°C (D) An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Description : Pick out the wrong statement. (A) Pensky-Marten apparatus is used for determining flash points above 50°C (B) Characterisation factor of paraffinic crude oil is more than 12 (C) Abel ... An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Last Answer : (D) An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Higher viscosity index of a lubricating oil denotes (A) Less changes in fluidity of oil with temperature (B) Substantially high change in fluidity of oil with temperature (C) Its unsuitability under varying temperature conditions (D) None of these

Description : Higher viscosity index of a lubricating oil denotes (A) Less changes in fluidity of oil with temperature (B) Substantially high change in fluidity of oil with temperature (C) Its unsuitability under varying temperature conditions (D) None of these

Last Answer : (A) Less changes in fluidity of oil with temperature

Flash point of a liquid petroleum fuel gives an idea about its (A) Volatility (B) Explosion hazards characteristics (C) Nature of boiling point diagram (D) All (A), (B) and (C)

Description : Flash point of a liquid petroleum fuel gives an idea about its (A) Volatility (B) Explosion hazards characteristics (C) Nature of boiling point diagram (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Reid vapour pressure of gasoline is the measure of its (A) Pour point (B) Cloud point (C) Vapour locking tendency (D) Carbon residue

Description : Reid vapour pressure of gasoline is the measure of its (A) Pour point (B) Cloud point (C) Vapour locking tendency (D) Carbon residue

Last Answer : (C) Vapour locking tendency

Pour point and freezing point is equal for (A) Petrol (B) Diesel (C) Water (D) Crude petroleum

Description : Pour point and freezing point is equal for (A) Petrol (B) Diesel (C) Water (D) Crude petroleum

Last Answer : (C) Water

Waxy crudes are treated with chemical additives mainly to (A) Depress its pour point (B) Dissolve wax (C) Precipitate wax (D) Remove wax

Description : Waxy crudes are treated with chemical additives mainly to (A) Depress its pour point (B) Dissolve wax (C) Precipitate wax (D) Remove wax

Last Answer : (A) Depress its pour point

Which of the following is the most important property for a jet fuel? (A) Cloud point (B) Pour point (C) Colour (D) Freezing point

Description : Which of the following is the most important property for a jet fuel? (A) Cloud point (B) Pour point (C) Colour (D) Freezing point

Last Answer : (D) Freezing point

Pour point of a petrofuel is (A) Multiple of 3°F (B) Multiple of 5°F (C) 5°C below the temperature at which oil ceases to flow (D) None of these

Description : Pour point of a petrofuel is (A) Multiple of 3°F (B) Multiple of 5°F (C) 5°C below the temperature at which oil ceases to flow (D) None of these

Last Answer : (C) 5°C below the temperature at which oil ceases to flow

Tetra-ethyl lead is added in gasoline to (A) Increase its smoke point (B) Reduce gum formation(C) Reduce the pour point(D) Increase its octane numbe

Description : Tetra-ethyl lead is added in gasoline to (A) Increase its smoke point (B) Reduce gum formation (C) Reduce the pour point (D) Increase its octane numbe

Last Answer : (D) Increase its octane numbe

For a binary mixture with low relative volatility, continuous rectification to get pure products will require (A) Low reflux ratio (B) Less number of trays (C) Small cross-section column (D) High reflux ratio

Description : For a binary mixture with low relative volatility, continuous rectification to get pure products will require (A) Low reflux ratio (B) Less number of trays (C) Small cross-section column (D) High reflux ratio

Last Answer : (D) High reflux ratio

Solvent used in extractive distillation (A) Changes the relative volatility of the original components (B) Should be of high volatility (C) Should form azeotropes with the original components (D) All (A), (B) and (C)

Description : Solvent used in extractive distillation (A) Changes the relative volatility of the original components (B) Should be of high volatility (C) Should form azeotropes with the original components (D) All (A), (B) and (C)

Last Answer : (A) Changes the relative volatility of the original components

Solvent used in extractive distillation (A) Is of low volatility (B) Forms a low boiling azeotrope (C) Forms a high boiling azeotrope (D) Does not alter the relative volatility of the original components

Description : Solvent used in extractive distillation (A) Is of low volatility (B) Forms a low boiling azeotrope (C) Forms a high boiling azeotrope (D) Does not alter the relative volatility of the original components

Last Answer : (B) Forms a low boiling azeotrope

Pick out the correct statement. (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non￾ideal binary system by distillation (B) A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn (C) Solvent used in extractive distillation should be of high volatility (D) Flash distillation is suitable for separating components which have very close boiling temperature

Description : Pick out the correct statement. (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of ... Flash distillation is suitable for separating components which have very close boiling temperature

Last Answer : (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non￾ideal binary system by distillation

High pressure at the bottom of a distillation tower handling heat sensitive materials results in (A) Thermal decomposition of bottoms (B) Increased relative volatility (C) Erosion of the tower (D) Very efficient operation

Description : High pressure at the bottom of a distillation tower handling heat sensitive materials results in (A) Thermal decomposition of bottoms (B) Increased relative volatility (C) Erosion of the tower (D) Very efficient operation

Last Answer : (A) Thermal decomposition of bottoms

For a binary mixture with low relative volatility, (A) Use steam distillation (B) Use molecular distillation (C) Use high pressure distillation (D) An azeotrope may be formed during distillation

Description : For a binary mixture with low relative volatility, (A) Use steam distillation (B) Use molecular distillation (C) Use high pressure distillation (D) An azeotrope may be formed during distillation

Last Answer : (D) An azeotrope may be formed during distillation

Pick out the wrong statement. Generally for physical adsorption, a gas of (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight (B) High critical temperature is adsorbed in preference to a gas of low critical temperature (C) Low volatility is adsorbed in preference to a gas of high volatility (D) None of these

Description : Pick out the wrong statement. Generally for physical adsorption, a gas of (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight (B) High critical temperature ... volatility is adsorbed in preference to a gas of high volatility (D) None of these

Last Answer : (D) None of these

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

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

__________ treatment is done for appreciable improvement in viscosity index of lubricating oil. (A) Acid (B) Solvent extraction (C) Alkali (D) Clay

Description : __________ treatment is done for appreciable improvement in viscosity index of lubricating oil. (A) Acid (B) Solvent extraction (C) Alkali (D) Clay

Last Answer : (B) Solvent extraction

The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same. (A) Kinematic viscosity (B) Work (C) Temperature (D) None of these

Description : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same. (A) Kinematic viscosity (B) Work (C) Temperature (D) None of these

Last Answer : (D) None of these

Babbitt metal used for making bearings should have (A) High co-efficient of friction between journal and bearing (B) Ability to retain lubricant on its surface (C) Low co-efficient of friction between journal and bearing (D) Both (B) & (C)

Description : Babbitt metal used for making bearings should have (A) High co-efficient of friction between journal and bearing (B) Ability to retain lubricant on its surface (C) Low co-efficient of friction between journal and bearing (D) Both (B) & (C)

Last Answer : (A) High co-efficient of friction between journal and bearing

Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its (A) Poor oxidation stability and high gum forming tendency (B) Greater tendency of decomposition at elevated temperature (C) Hydrolysis tendency in presence of water (D) All (A), (B) and (C)

Description : Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its (A) Poor oxidation stability and high gum forming ... at elevated temperature (C) Hydrolysis tendency in presence of water (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)