Presence of SO2 in furnace gases attacks the ferrous metal by way of (A) Accelerating the rate of scaling (B) Causing metal embrittlement (C) Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature (D) All (A), (B) and (C)

Presence of SO2
in furnace gases attacks the ferrous metal by way of
(A) Accelerating the rate of scaling
(B) Causing metal embrittlement
(C) Attacking the grain boundaries; particularly severe on low carbon and
nickel bearing steels at high temperature
(D) All (A), (B) and (C)
by

1 Answer

Answer :

(D) All (A), (B) and (C)
by

Related questions

Generally __________ are subjected to galvanising (i.e., zinc coating). (A) Non-ferrous metals (B) Non-metals (C) Low carbon steels (D) Stainless steel

Description : Generally __________ are subjected to galvanising (i.e., zinc coating). (A) Non-ferrous metals (B) Non-metals (C) Low carbon steels (D) Stainless steel

Last Answer : (C) Low carbon steels

Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures (C) Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness (D) None of these

Description : Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon ... the metal surface) cause nitride formation with increase in surface hardness (D) None of these

Last Answer : (D) None of these

Identify the false statement (A) Martensitic steels are less susceptible to pitting corrosion than austenitic steels (B) Pitting corrosion is usually very localised (C) Hydrogen embrittlement is facilitated by tensile stress (D) Stress corrosion cracking is facilitated by tensile stress

Description : Identify the false statement (A) Martensitic steels are less susceptible to pitting corrosion than austenitic steels (B) Pitting corrosion is usually very localised (C) Hydrogen embrittlement is facilitated by tensile stress (D) Stress corrosion cracking is facilitated by tensile stress

Last Answer : (A) Martensitic steels are less susceptible to pitting corrosion than austenitic steels

What is temper embrittlement in alloy steels and what are its effects ?

Description : What is temper embrittlement in alloy steels and what are its effects ?

Last Answer : Embrittlement attack is usually intergranular in metals, i.e. cracks progress between the grains of the polycrystalline material. It imparts a tendency to fail under a static load after a given period of time in those alloy steels which are susceptible to embrittlement.

The rate of scaling of furnace stock depends upon the (A) Temperature (B) Time(C) Nature of atmosphere(D) All (A), (B) and (C)

Description : The rate of scaling of furnace stock depends upon the (A) Temperature (B) Time (C) Nature of atmosphere (D) All (A), (B) and (C)

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

Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress. (A) Ultimate (B) Yield point (C) Proof (D) None of these

Description : Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress. (A) Ultimate (B) Yield point (C) Proof (D) None of these

Last Answer : (C) Proof

Secondary hardening in steels arises out of the (A) Precipitation of fine alloy carbides at high temperatures (B) Refinement of ferrite grain size by working (C) Decomposition of retained austenite upon heat treatment (D) Precipitation of complex inter-metallic upon heat treatment

Description : Secondary hardening in steels arises out of the (A) Precipitation of fine alloy carbides at high temperatures (B) Refinement of ferrite grain size by working (C) Decomposition of retained austenite upon heat treatment (D) Precipitation of complex inter-metallic upon heat treatment

Last Answer : Option C

Presence of high concentration of ozone and smog in atmospheric air causes the(A) Embrittlement & decrease of folding resistance of paper(B) Cracking of rubber products(C) Fading of dye on textiles(D) Damage of electrical insulator on high tension power line

Description : Presence of high concentration of ozone and smog in atmospheric air causes the (A) Embrittlement & decrease of folding resistance of paper (B) Cracking of rubber products (C) Fading of dye on textiles (D) Damage of electrical insulator on high tension power line

Last Answer : (B) Cracking of rubber products

Which of the following has a very high carbide forming tendency in steels? (A) Silicon (B) Chromium (C) Nickel (D) Vanadium

Description : Which of the following has a very high carbide forming tendency in steels? (A) Silicon (B) Chromium (C) Nickel (D) Vanadium

Last Answer : (D) Vanadium

Scaling of furnace stock is reduced by __________ in flue gas. (A) CO (B) H2 (C) High CO/CO2 (D) All (A), (B) & (C)

Description : Scaling of furnace stock is reduced by __________ in flue gas. (A) CO (B) H2 (C) High CO/CO2 (D) All (A), (B) & (C)

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

Nickel as a material of construction (A) Is used as an alloying element for both ferrous & non-ferrous alloys (B) Is paramagnetic below 415° C (its Curie temperature) (C) Diamagnetic (D) Has a body centred cubic (bcc) crystal lattice structure

Description : Nickel as a material of construction (A) Is used as an alloying element for both ferrous & non-ferrous alloys (B) Is paramagnetic below 415° C (its Curie temperature) (C) Diamagnetic (D) Has a body centred cubic (bcc) crystal lattice structure

Last Answer : (A) Is used as an alloying element for both ferrous & non-ferrous alloys

Which of the following alloy steels is the most suitable for making gun barrels and projectiles? (A) Tungsten steel (B) Molybdenum steel (C) Nickel-chrome steel (D) Cobalt steel

Description : Which of the following alloy steels is the most suitable for making gun barrels and projectiles? (A) Tungsten steel (B) Molybdenum steel (C) Nickel-chrome steel (D) Cobalt steel

Last Answer : (C) Nickel-chrome steel

Blast furnace coke is made from coal by (A) Low temperature carbonisation (B) High temperature carbonisation (C) Medium temperature carbonisation (D) Heating the coal in an oven in presence of air

Description : Blast furnace coke is made from coal by (A) Low temperature carbonisation (B) High temperature carbonisation (C) Medium temperature carbonisation (D) Heating the coal in an oven in presence of air

Last Answer : (B) High temperature carbonisation

Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of (A) CO2 (B) SO2 (C) Hydrocarbons (D) CFC (chloro fluoro carbon)

Description : Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of (A) CO2 (B) SO2 (C) Hydrocarbons (D) CFC (chloro fluoro carbon)

Last Answer : (D) CFC (chloro fluoro carbon)

Use of molten metal as a coolant in fast breeder reactor helps in (A) Rapid heat transfer from the core (B) Accelerating the reaction rate in the core (C) Breeding neutrons (D) Accelerating the neutrons

Description : Use of molten metal as a coolant in fast breeder reactor helps in (A) Rapid heat transfer from the core (B) Accelerating the reaction rate in the core (C) Breeding neutrons (D) Accelerating the neutrons

Last Answer : (A) Rapid heat transfer from the core

The purpose of controlling the furnace atmosphere is to prevent surface attack by (A) Oxidation/scaling (B) Decarburising (C) Sulphur penetration (D) Either of the above

Description : The purpose of controlling the furnace atmosphere is to prevent surface attack by (A) Oxidation/scaling (B) Decarburising (C) Sulphur penetration (D) Either of the above

Last Answer : (D) Either of the above

India is particularly poor in reserves of (a) coal (b) iron ore (c) non-ferrous metals (d) limestone

Description : India is particularly poor in reserves of (a) coal (b) iron ore (c) non-ferrous metals (d) limestone

Last Answer : Ans: (c)

Low carbon steels are those in which carbon percentage is around (A) 0.1 to 0.35 (B) 0.4 to 0.7 (C) 0.8 to 1.5 (D) 1.5 to 2

Description : Low carbon steels are those in which carbon percentage is around (A) 0.1 to 0.35 (B) 0.4 to 0.7 (C) 0.8 to 1.5 (D) 1.5 to 2

Last Answer : (A) 0.1 to 0.35

The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement. (A) Brass for low (B) Nickel alloys for high (C) Both 'a' & 'b' (D) Aluminium for all

Description : The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement. (A) Brass for low (B) Nickel alloys for high (C) Both 'a' & 'b' (D) Aluminium for all

Last Answer : (C) Both 'a' & 'b'

Weld decay occurs in which of the following steel types? a) Carbon/Manganese b) Low alloy c) Any stainless steel d) Austenitic stainless steels

Description : Weld decay occurs in which of the following steel types? a) Carbon/Manganese b) Low alloy c) Any stainless steel d) Austenitic stainless steels

Last Answer : d) Austenitic stainless steels

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by (A) Biological oxygen pond (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) (C) Lagoons (D) Filtration

Description : Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by (A) Biological oxygen pond (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) (C) Lagoons (D) Filtration

Last Answer : (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

__________ furnace is generally used in the non-ferrous foundries. (A) Direct arc (B) Indirect arc (C) Resistance (D) Induction

Description : __________ furnace is generally used in the non-ferrous foundries. (A) Direct arc (B) Indirect arc (C) Resistance (D) Induction

Last Answer : (B) Indirect arc

Most of the phosphorous present in the blast furnace burden enters into (A) Hot metal (B) Flue gases (C) Slag (D) Refractory lining

Description : Most of the phosphorous present in the blast furnace burden enters into (A) Hot metal (B) Flue gases (C) Slag (D) Refractory lining

Last Answer : (A) Hot metal

Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld (D) Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Description : Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the ... of carbon and other element occurs in the weld pool leading to poor properties of the weld

Last Answer : (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

Which of the following is the most severe air pollutant? (A) Hydrocarbons (B) NOx (C) SO2 (D) CO

Description : Which of the following is the most severe air pollutant? (A) Hydrocarbons (B) NOx (C) SO2 (D) CO

Last Answer : (B) NOx

Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in (A) Pyrolysis of oil(B) Sintering of porous catalyst(C) Hydrogen embrittlement(D) All (A), (B) and (C)

Description : Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in (A) Pyrolysis of oil (B) Sintering of porous catalyst (C) Hydrogen embrittlement (D) All (A), (B) and (C)

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

Find false statement about effect of sulphur in fuel? (A) It has heating value (B) It helps in electrostatic precipitation of ash in flue gases (C) It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low (D) It erodes furnace walls

Description : Find false statement about effect of sulphur in fuel? (A) It has heating value (B) It helps in electrostatic precipitation of ash in flue gases (C) It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low (D) It erodes furnace walls

Last Answer : (D) It erodes furnace walls

Pick out the wrong statement. (A) A slight haze at the top of chimney indicates good combustion in the furnace (B) A bag filter incurs very small pressure drop and is very efficient for removal of submicronic dust particles from flue gases at very high temperature (C) Electrostatic precipitator is the most efficient dust collection equipment for removal of submicronic dust particles present in flue gas (D) None of these

Description : Pick out the wrong statement. (A) A slight haze at the top of chimney indicates good combustion in the furnace (B) A bag filter incurs very small pressure drop and is very efficient for ... dust collection equipment for removal of submicronic dust particles present in flue gas (D) None of these

Last Answer : (B) A bag filter incurs very small pressure drop and is very efficient for removal of submicronic dust particles from flue gases at very high temperature

. Which of the following fuel gases contains maximum amount of carbon monoxide? (A) Coke oven gas (B) Water gas (C) Blast furnace gas (D) L.D. converter gas

Description : . Which of the following fuel gases contains maximum amount of carbon monoxide? (A) Coke oven gas (B) Water gas (C) Blast furnace gas (D) L.D. converter gas

Last Answer : (D) L.D. converter gas

Galvanising is generally done on (A) Non-ferrous metals (B) Low carbon steel (C) Stainless steel (D) Cast iron

Description : Galvanising is generally done on (A) Non-ferrous metals (B) Low carbon steel (C) Stainless steel (D) Cast iron

Last Answer : (B) Low carbon steel

Pick out the wrong statement. (A) Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust (B) NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light (C) Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees (D) H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2

Description : Pick out the wrong statement. (A) Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust (B) NO2 is capable of penetrating the troposphere and ... at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2

Last Answer : (D) H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2

Which of the following imparts deep blue colour to glass? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Description : Which of the following imparts deep blue colour to glass? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Last Answer : (4) Nickel oxide Explanation: Glass colouring and colour marking may be obtained by addition of colouring ions, by precipitation of nanometer sized colloides (so-called striking glasses such as "ruby gold" or red "selenium ruby"), by coloured inclusions (as in milk glass and smoked glass).

The positive plants of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Description : The positive plants of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Last Answer : a. Nickel hydroxide

The positive plates of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Description : The positive plates of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Last Answer : a. Nickel hydroxide

Which of the following imparts deep blue colour to glass ? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Description : Which of the following imparts deep blue colour to glass ? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Last Answer : Nickel oxide

Coarse grained steels have (A) Low toughness (B) No tendency to distort (C) High density (D) Very high toughness

Description : Coarse grained steels have (A) Low toughness (B) No tendency to distort (C) High density (D) Very high toughness

Last Answer : (B) No tendency to distort

Earing is a defect found in steels after the following metal working operation. (A) Extrusion (B) Rolling (C) Deep drawing (D) Wire drawing

Description : Earing is a defect found in steels after the following metal working operation. (A) Extrusion (B) Rolling (C) Deep drawing (D) Wire drawing

Last Answer : (C) Deep drawing

Pick out the wrong statement. (A) Caustic embrittlement of boiler's metallic parts is caused by highconcentration of caustic soda in boiler feed water(B) Cooling and freezing of water kills the bacteria present in it(C) With increasing boiler operating pressure of steam, the maximumallowable concentration of silica in feed water goes on decreasing(D) Dissolved oxygen content in high pressure boiler feed water should benil

Description : Pick out the wrong statement. (A) Caustic embrittlement of boiler's metallic parts is caused by highconcentration of caustic soda in boiler feed water (B) Cooling and freezing of water kills the ... goes on decreasing (D) Dissolved oxygen content in high pressure boiler feed water should be nil

Last Answer : (B) Cooling and freezing of water kills the bacteria present in it

Deaeration of high pressure boiler feed water is done to reduce (A) Foaming from boilers (B) Its dissolved oxygen content (C) Its silica content (D) Caustic embrittlement

Description : Deaeration of high pressure boiler feed water is done to reduce (A) Foaming from boilers (B) Its dissolved oxygen content (C) Its silica content (D) Caustic embrittlement

Last Answer : (B) Its dissolved oxygen content

In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the (A) Rate of firing and emissivity of flame (B) Thermal conductivity of the charge & structural materials of furnace (C) Nature of process; whether batch, continuous or intermittent (D) All (A), (B) and (C)

Description : In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the (A) Rate of firing and emissivity of flame (B) Thermal conductivity of the charge & ... (C) Nature of process; whether batch, continuous or intermittent (D) All (A), (B) and (C)

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

The following prokinetic drug has been implicated in causing serious ventricular arrhythmias, particularly in patients concurrently receiving erythromycin or ketoconazole: A. Domperidone B. Cisapride C. Mosapride D. Metoclopramide

Description : The following prokinetic drug has been implicated in causing serious ventricular arrhythmias, particularly in patients concurrently receiving erythromycin or ketoconazole: A. Domperidone B. Cisapride C. Mosapride D. Metoclopramide

Last Answer : B. Cisapride

Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases. (A) Reduce SO2 content in (B) Catalytically convert SO2 to SO3 in (C) Increase the dew point of (D) None of these

Description : Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases. (A) Reduce SO2 content in (B) Catalytically convert SO2 to SO3 in (C) Increase the dew point of (D) None of these

Last Answer : (A) Reduce SO2 content in

Exposure to SO2 containing chimney gases results in the (A) Reduction in strength of leather & cloth (B) Acceleration of corrosion rates of metals (C) Increased drying & hardening time of paints (D) All (A), (B) and (C)

Description : Exposure to SO2 containing chimney gases results in the (A) Reduction in strength of leather & cloth (B) Acceleration of corrosion rates of metals (C) Increased drying & hardening time of paints (D) All (A), (B) and (C)

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

Dislocation cross-slip is difficult in those materials, which have (A) Large number of slip systems (B) High work hardening rate (C) Coarse grain size (D) Low stacking fault energy

Description : Dislocation cross-slip is difficult in those materials, which have (A) Large number of slip systems (B) High work hardening rate (C) Coarse grain size (D) Low stacking fault energy

Last Answer : (D) Low stacking fault energy

The preferred class of drugs for long term treatment of severe anxiety disorder with intermittent panic attacks is: A. Phenothiazine (chlorpromazine like) B. Azapirone (buspirone like) C. β-blocker (propranolol like) D. Selective serotonin reuptake inhibitor (sertraline like)

Description : The preferred class of drugs for long term treatment of severe anxiety disorder with intermittent panic attacks is: A. Phenothiazine (chlorpromazine like) B. Azapirone (buspirone like) C. β-blocker (propranolol like) D. Selective serotonin reuptake inhibitor (sertraline like)

Last Answer : DD. Selective serotonin reuptake inhibitor (sertraline like)

Prophylactic therapy of migraine: A. Is recommended in all cases B. Benefits upto 70% patients of moderate to severe migraine C. Needs to be continued lifelong without interruption D. Reduces the severity but increases the frequency of migraine attacks

Description : Prophylactic therapy of migraine: A. Is recommended in all cases B. Benefits upto 70% patients of moderate to severe migraine C. Needs to be continued lifelong without interruption D. Reduces the severity but increases the frequency of migraine attacks

Last Answer : B. Benefits upto 70% patients of moderate to severe migraine

Select the correct statement in relation to drug therapy of migraine: A. Simple analgesics like paracetamol are ineffective in migraine B. Ergot alkaloids are used for prophylaxis as well as treatment of migraine attacks C. Use of ergot alkaloids is restricted to severe or resistant cases D. Ergot alkaloids should be given till 24 hours after an attack has subsided

Description : Select the correct statement in relation to drug therapy of migraine: A. Simple analgesics like paracetamol are ineffective in migraine B. Ergot alkaloids are used for prophylaxis as well as treatment ... resistant cases D. Ergot alkaloids should be given till 24 hours after an attack has subsided

Last Answer : C. Use of ergot alkaloids is restricted to severe or resistant cases

The amount of combustible escaping unconsumed from the furnace, depends upon the (A) Air supplied and furnace temperature (B) Burner design (thoroughness of mixing versus stratification) (C) Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction) (D) All (A), (B) and (C)

Description : The amount of combustible escaping unconsumed from the furnace, depends upon the (A) Air supplied and furnace temperature (B) Burner design (thoroughness of mixing versus stratification) (C) Air preheat and the flow of ... , by acceleration or by change of direction) (D) All (A), (B) and (C)

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

The heat recoverable from flue gases of furnaces depends on the (A) Thermal efficiency of furnace (B) Quantity of flue gases (C) Flue gas temperature drop through the furnace (D) All (A), (B) and (C)

Description : The heat recoverable from flue gases of furnaces depends on the (A) Thermal efficiency of furnace (B) Quantity of flue gases (C) Flue gas temperature drop through the furnace (D) All (A), (B) and (C)

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

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the(A) Quantity & temperature of waste gas(B) Dust concentration & nature of dust in waste gas(C) Corrosive nature of the waste gas(D) All (A), (B) and (C)

Description : Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the (A) Quantity & temperature of waste gas (B) Dust concentration & nature of dust in waste gas (C) Corrosive nature of the waste gas (D) All (A), (B) and (C)

Last Answer : (B) Dust concentration & nature of dust in waste gas