Which one of the following elements is essential for the construction of nuclear reactors? (1) Cobalt (2) Nicke (3) Zirconium (4) Tungsten

Which one of the following elements is essential for the construction of nuclear reactors? (1) Cobalt (2) Nicke (3) Zirconium (4) Tungsten
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(3) Zirconium Explanation: Zirconium is an essential element for the construction of nuclear reactors.
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Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are (A) Cobalt, chromium & tungsten (B) Cobalt, chromium & nickel (C) Molybdenum, tungsten & chromium (D) Cobalt, zirconium & molybdenum

Description : Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are (A) Cobalt, chromium & tungsten (B) Cobalt, chromium & nickel (C) Molybdenum, tungsten & chromium (D) Cobalt, zirconium & molybdenum

Last Answer : : Option A

Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of (A) 90% tungsten carbide and 10% cobalt (B) 70% aluminium oxide & 30% silica (C) 30% nickel, 15% chromium & 55% tungsten (D) 65% tungsten & 35% zirconium

Description : Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of (A) 90% tungsten carbide and 10% cobalt (B) 70% aluminium oxide & 30% silica (C) 30% nickel, 15% chromium & 55% tungsten (D) 65% tungsten & 35% zirconium

Last Answer : Option A

__________ has the highest melting point out of the following. (A) Tungsten (B) Zirconium (C) Molybdenum (D) Tantalum

Description : __________ has the highest melting point out of the following. (A) Tungsten (B) Zirconium (C) Molybdenum (D) Tantalum

Last Answer : Option A

Pick up the metal refractory from the following: (A) Molybdenum (B) Tungsten (C) Zirconium (D) All of these

Description : Pick up the metal refractory from the following: (A) Molybdenum (B) Tungsten (C) Zirconium (D) All of these

Last Answer : Answer: Option D

Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are: (A) Nickel, cobalt & chromium (B) Tungsten, chromium & cobalt (C) Manganese, chromium & cobalt (D) Tungsten, molybdenum & nickel

Description : Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are: (A) Nickel, cobalt & chromium (B) Tungsten, chromium & cobalt (C) Manganese, chromium & cobalt (D) Tungsten, molybdenum & nickel

Last Answer : Option B

Which of the following elements is not radioactive? (1) Radium (2) Plutonium (3) Zirconium (4) Uranium

Description : Which of the following elements is not radioactive? (1) Radium (2) Plutonium (3) Zirconium (4) Uranium

Last Answer : (3) Zirconium Explanation: Zireonium is a lustrous, greywhite, strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and pacifier, although it is used in small amounts as an alloying agent for its strong resistance to corrosion.

Which of the following elements is nonradioactive? (1) Uranium (2) Thorium (3) Plutonium (4) Zirconium

Description : Which of the following elements is nonradioactive? (1) Uranium (2) Thorium (3) Plutonium (4) Zirconium

Last Answer : (4) Zirconium Explanation: Zirconium is non-radioactive. It is a chemical element with the symbol Zr, atomic number 40 and atomic mass of 91.224. The name of zirconium is taken from the ... important source of zirconium. It is a lustrous, grey-white, strong transition metal that resembles titanium.

Which of the following elements is not radio-active ? (1) Radium (2) Plutonium (3) Zirconium (4) Uranium

Description : Which of the following elements is not radio-active ? (1) Radium (2) Plutonium (3) Zirconium (4) Uranium

Last Answer : Zirconium

Which of the following elements is non-radioactive ? (1) Uranium (2) Thorium (3) Plutonium (4) Zirconium

Description : Which of the following elements is non-radioactive ? (1) Uranium (2) Thorium (3) Plutonium (4) Zirconium

Last Answer : Zirconium

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

. Invar contains the highest percentage of (A) Vanadium (B) Iron (C) Tungsten (D) Cobalt

Description : . Invar contains the highest percentage of (A) Vanadium (B) Iron (C) Tungsten (D) Cobalt

Last Answer : (B) Iron

Residual magnetism in steel for magnets is increased by the addition of (A) Nickel (B) Cobalt (C) Tungsten (D) Chromium

Description : Residual magnetism in steel for magnets is increased by the addition of (A) Nickel (B) Cobalt (C) Tungsten (D) Chromium

Last Answer : (B) Cobalt

__________ can replace tungsten in high speed steel, (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum

Description : __________ can replace tungsten in high speed steel, (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum

Last Answer : (D) Molybdenum

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets. (A) Chromium (B) Nickel (C) Tungsten (D) Cobalt

Description : Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets. (A) Chromium (B) Nickel (C) Tungsten (D) Cobalt

Last Answer : (D) Cobalt

Constituents of stellite are (A) Zinc, copper and nickel (B) Cobalt, chromium and tungsten (C) Zinc, aluminium and nickel (D) Nickel, cobalt and vanadium

Description : Constituents of stellite are (A) Zinc, copper and nickel (B) Cobalt, chromium and tungsten (C) Zinc, aluminium and nickel (D) Nickel, cobalt and vanadium

Last Answer : (B) Cobalt, chromium and tungsten

Constituents of stellite are (A) Zinc, copper & nickel (B) Cobalt, chromium & tungsten (C) Zinc, aluminium & nickel (D) Nickel, cobalt & vanadium

Description : Constituents of stellite are (A) Zinc, copper & nickel (B) Cobalt, chromium & tungsten (C) Zinc, aluminium & nickel (D) Nickel, cobalt & vanadium

Last Answer : (B) Cobalt, chromium & tungsten

__________ can replace tungsten in high speed steel. (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum

Description : __________ can replace tungsten in high speed steel. (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum

Last Answer : (C) Cobalt

__________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten. (A) Stellite (B) High speed steel (C) Cermet (D) Alnico

Description : __________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten. (A) Stellite (B) High speed steel (C) Cermet (D) Alnico

Last Answer : Option A

The main constituent of permalloy is (a) cobalt (b) chromium (c) nickel (d) tungsten

Description : The main constituent of permalloy is (a) cobalt (b) chromium (c) nickel (d) tungsten

Last Answer : (c) nickel

Which of the following is a moderating material used in nuclear reactor? (A) Graphite (B) Cadmium (C) Zircaloy (an alloy of zirconium and aluminium)

Description : Which of the following is a moderating material used in nuclear reactor? (A) Graphite (B) Cadmium (C) Zircaloy (an alloy of zirconium and aluminium)

Last Answer : (A) Graphite

Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium (A) Tin, nickel, iron and chromium (B) And graphite

Description : Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium (A) Tin, nickel, iron and chromium (B) And graphite

Last Answer : (A) Tin, nickel, iron and chromium

Of the following, which non-fissioning element is used in the cooling water of nuclear power plants to help control the rate of the fission reaction by absorbing neutrons: w) zirconium x) boron y) krypton z) cesium

Description : Of the following, which non-fissioning element is used in the cooling water of nuclear power plants to help control the rate of the fission reaction by absorbing neutrons: w) zirconium x) boron y) krypton z) cesium

Last Answer : ANSWER: X -- BORON

Graphite is used in nuclear reactors for- (1) reducing the speed of fast neutrons (2) cooling the reactor (3) absorbing neutrons (4) None of the above

Description : Graphite is used in nuclear reactors for- (1) reducing the speed of fast neutrons (2) cooling the reactor (3) absorbing neutrons (4) None of the above

Last Answer : (1) reducing the speed of fast neutrons Explanation: A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows unenriched uranium to be used as nuclear fuel.

Which of the following is used as a moderator in nuclear reactors? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium

Description : Which of the following is used as a moderator in nuclear reactors? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium

Last Answer : (2) Graphite Explanation: Graphite is used a moderator in nuclear reactors.

Which one among the following is used as a moderator in nuclear reactors? (1) Ozone (2) Heavy hydrogen (3) Hydrogen peroxide (4) Heavy water

Description : Which one among the following is used as a moderator in nuclear reactors? (1) Ozone (2) Heavy hydrogen (3) Hydrogen peroxide (4) Heavy water

Last Answer : (4) Heavy water Explanation: A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator.

Which of the following is used as a coolant in nuclear reactors? (1) Heavy water (2) Cadmium (3) Liquid sodium (4) Graphite

Description : Which of the following is used as a coolant in nuclear reactors? (1) Heavy water (2) Cadmium (3) Liquid sodium (4) Graphite

Last Answer : (3) Liquid sodium Explanation: Liquid metallic sodium may be used as the sole coolant, carrying heat from the core. Sodium has only one stable isotope, sodium-23. Sodium-23 is a very weak absorber of neutrons.

In Nuclear reactors graphite is used as (1) Lubricant (2) Fuel (3) Linear of the reactor (4) Modulator

Description : In Nuclear reactors graphite is used as (1) Lubricant (2) Fuel (3) Linear of the reactor (4) Modulator

Last Answer : (4) Modulator Explanation: Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.

Which one among the following is-used as a moderator in nuclear reactors? (1) Ozone (2) Heavy hydrogen (3) Heavy water (4) Hydrogen peroxide

Description : Which one among the following is-used as a moderator in nuclear reactors? (1) Ozone (2) Heavy hydrogen (3) Heavy water (4) Hydrogen peroxide

Last Answer : (3) Heavy water Explanation: Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium238.

The basic process taking place in nuclear reactors is - (1) Radioactivity (2) Fission (3) Fusion (4) None of the above

Description : The basic process taking place in nuclear reactors is - (1) Radioactivity (2) Fission (3) Fusion (4) None of the above

Last Answer : (2) Fission Explanation: A nuclear reactor produces and controls the re-lease of energy from splitting the atoms of uranium, known as nuclear fission. When a fissile atomic nucleus such as uranium235 ... process produces free neutrons and gamma pho-tons, and releases a very large amount of energy.

In nuclear reactors, graphite is used as a/an – (1) fuel (2) lubricant (3) moderator (4) insulator

Description : In nuclear reactors, graphite is used as a/an – (1) fuel (2) lubricant (3) moderator (4) insulator

Last Answer : (3) moderator Explanation: A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the ... turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235.

The basic process taking place in nuclear reactors is (1) Radioactivity (2) Fission (3) Fusion (4) None of the above

Description : The basic process taking place in nuclear reactors is (1) Radioactivity (2) Fission (3) Fusion (4) None of the above

Last Answer : Fission

Which of the following is used as a moderator in nuclear reactors ? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium

Description : Which of the following is used as a moderator in nuclear reactors ? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium

Last Answer : Graphite

In nuclear reactors, graphite is used as a/an (1) fuel (2) lubricant (3) moderator(4) insulator

Description : In nuclear reactors, graphite is used as a/an (1) fuel (2) lubricant (3) moderator(4) insulator

Last Answer : moderator

Mercury is transported in metal containers made of (A) Aluminium (B) Iron (C) Lead (D) Nicke

Description : Mercury is transported in metal containers made of (A) Aluminium (B) Iron (C) Lead (D) Nicke

Last Answer : (B) Iron

Inconel is an alloy of (A) Tin, zinc and nicke(B) Iron, nickel and chromium(C) Copper and nickel(D) Copper and tin

Description : Inconel is an alloy of (A) Tin, zinc and nicke (B) Iron, nickel and chromium (C) Copper and nickel (D) Copper and tin

Last Answer : (B) Iron, nickel and chromium

__________ catalyst is used in the production of urea from CO2 and NH3 . (A) Vanadium pentoxide (B) No (C) Alumina (D) Nicke

Description : __________ catalyst is used in the production of urea from CO2 and NH3 . (A) Vanadium pentoxide (B) No (C) Alumina (D) Nicke

Last Answer : (B) No

Which of the following elements is not present in stainless steel? (1) Iron (2) Tungsten (3) Chromium (4) Nickel

Description : Which of the following elements is not present in stainless steel? (1) Iron (2) Tungsten (3) Chromium (4) Nickel

Last Answer : (2) Tungsten Explanation: Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: ... stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.

Name two elements that find wide application in transistor industry – (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

Description : Name two elements that find wide application in transistor industry – (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

Last Answer : (1) Silicon and Germanium Explanation: A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. Semiconductor material (date first used): the metalloids ... -germanium (1989), the allotrope of carbon graphene (research ongoing since 2004), etc.

Which of the following elements is not present in stainless steel? (1) Iron (2) Tungsten (3) Chromium(4) Nickel

Description : Which of the following elements is not present in stainless steel? (1) Iron (2) Tungsten (3) Chromium(4) Nickel

Last Answer : Tungsten

Name two elements that find wide application in transistor industry (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

Description : Name two elements that find wide application in transistor industry (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

Last Answer : Silicon and Germanium

What is the sign of zirconium ?

Description : What is the sign of zirconium ?

Last Answer : Zirconium signal Zr.

'Monazite' is an ore of - (1) Sodium (2) Titaniurm (3) Thorium (4) Zirconium

Description : 'Monazite' is an ore of - (1) Sodium (2) Titaniurm (3) Thorium (4) Zirconium

Last Answer : (3) Thorium Explanation: Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits. India, Madagascar, and South Africa have large deposits of monazite sands.

Why aren't the reactors and cooling tanks of nuclear power plants built below water level?

Description : Why aren't the reactors and cooling tanks of nuclear power plants built below water level?

Last Answer : answer:What would keep that water in once the area was flooded? If you open a dam, remove a levy, or open some kind of gate that water can flow both ways. A pump would allow you to control what comes and goes.

Japan's nuclear reactors have gone Chernobyl! Are you concerned?

Description : Japan's nuclear reactors have gone Chernobyl! Are you concerned?

Last Answer : I feel the same way about nuclear power that I did before this accident: It is too dangerous for humans to use safely. The consequences of accidents are too dire.

Thorium-fueled nuclear reactors - Pros and cons?

Description : Thorium-fueled nuclear reactors - Pros and cons?

Last Answer : I'm afraid that real development of commercial nuclear-powered energy has taken a hit for another generation with the recent accident. It's a shame, too, because as bad as this accident ... perception of nuclear accident will continue to be ecological catastrophe , regardless of the facts.

Spraying synthetic resin - How effective is such a measure going to be containing the Fukushima nuclear reactors?

Description : Spraying synthetic resin - How effective is such a measure going to be containing the Fukushima nuclear reactors?

Last Answer : Is there anything that absorbs radiation?

Should the executives be the first ones to undertake the suicide missions to save the failing nuclear reactors in Japan?

Description : Should the executives be the first ones to undertake the suicide missions to save the failing nuclear reactors in Japan?

Last Answer : Yes. A captain should go down with his ship, so to speak. Also should the president be on the front line armed and ready when instructing his country to invade a foreign nation? Hell yeah!

Is anyone concerned about the radioactivity from the crippled (and possibly melted down) nuclear reactors in Japan?

Description : Is anyone concerned about the radioactivity from the crippled (and possibly melted down) nuclear reactors in Japan?

Last Answer : I haven’t actually thought about that. Interesting. I honestly have no idea, but all I can say is… I sure hope the radiation exposure doesn’t spread.

Which is used as a coolant in nuclear reactors? -General Knowledge

Description : Which is used as a coolant in nuclear reactors? -General Knowledge

Last Answer : The answer is 'Liquidsodium'

Which is used as a coolant in nuclear reactors? -General Knowledge

Description : Which is used as a coolant in nuclear reactors? -General Knowledge

Last Answer : answer: