English

Titanium gets its name from the Titans of ancient Greek mythology but this thoroughly modern material is well suited to a huge range of high-tech applications. With the chemical symbol Ti and an atomic number of 22, titanium is a silver-coloured metal valued for its low density, high strength, and resistance to corrosion. Since then, the applications for this metal have grown exponentially, from its use (as titanium dioxide) in paints, paper, toothpaste, sunscreen and cosmetics, through to its use as an alloy in biomedical implants and aerospace innovations. Particularly exciting is the perfect marriage between titanium and 3D printing.

Titanium materials are expensive and can be problematic when it comes to traditional processing technologies. For example, its high melting point (1,670?, much higher than steel alloys) is a challenge. The relatively low-cost precision of 3D printing is, therefore, a game-changer for titanium. 3D printing is where an object is built layer by layer and designers can create amazing shapes. This allows the production of complex shapes such as replacement parts of a jaw bone, heel, hip, dental implants, or cranioplasty plates in surgery. It can also be used to make golf clubs and aircraft components.

The CSIRO is working with industry to develop new technologies in 3D printing using titanium. Advances in 3D printing are opening up new avenues to further improve the function of customised body part implants made of titanium. Such implants can be designed to be porous, making them lighter but allowing blood, nutrients and nerves to pass through and can even promote bone in-growth.

Titanium is considered the most biocompatible metal – not harmful or toxic to living tissue – due to its resistance to corrosion from bodily fluids. This ability to withstand the harsh bodily environment is a result of the protective oxide film that forms naturally in the presence of oxygen.  Its ability to physically bond with bone also gives titanium an advantage over other materials that require the use of an adhesive to remain attached. Titanium implants last longer, and much larger forces are required to break the bonds that join them to the body compared with their alternatives.
Titanium alloys commonly used in load-bearing implants are significantly less stiff – and closer in performance to the human bone – than stainless steel or cobalt-based alloys.

Titanium weighs about half as much as steel but is 30% stronger, which makes it ideally suited to the aerospace industry where every gram matters.

In the late 1940s, the US government helped to get production of titanium going as it could see its potential for “aircraft, missiles, spacecraft, and other military purposes”.

Titanium has increasingly become the buy-to-fly material for aircraft designers striving to develop faster, lighter and more efficient aircraft. About 39% of the US Air Force's F22 Raptor, one of the most advanced fighter aircraft in the world, is made of titanium. Civil aviation moved in the same direction with Boeing's new 787 Dreamliner made of 15% titanium, significantly more than previous models.

 Two key areas where titanium is used in airliners is in their landing gear and jet engines. Landing gear needs to withstand the massive amounts of force exerted on it every time a plane hits a runway. Titanium's toughness means it can absorb the huge amounts of energy expelled when a plane lands without ever weakening. Titanium's heat resistance means it can be used inside modern jet engines, where temperatures can reach 800?. Steel begins to soften at around 400? but titanium can withstand the intense heat of a jet engine without losing its strength.

What is the purpose of using the phrase “the perfect marriage” in the first paragraph?

The passage given below is followed by four alternate summaries. Choose the option that best captures the essence of the passage.

In 1944, at age 15, Martin Luther King entered Morehouse College in Atlanta under a special wartime program intended to boost enrolment by admitting promising high-school students like King. Before beginning college, however, King spent the summer on a tobacco farm in Connecticut; it was his first extended stay away from home and his first substantial experience of race relations outside the segregated South. He was shocked by how peacefully the races mixed in the North. This summer experience in the North only deepened King's growing hatred of racial segregation.

Direction for questions: The passage below is accompanied by a set of questions. Choose the best answer to each question.

Titanium gets its name from the Titans of ancient Greek mythology but this thoroughly modern material is well suited to a huge range of high-tech applications. With the chemical symbol Ti and an atomic number of 22, titanium is a silver-coloured metal valued for its low density, high strength, and resistance to corrosion. Since then, the applications for this metal have grown exponentially, from its use (as titanium dioxide) in paints, paper, toothpaste, sunscreen and cosmetics, through to its use as an alloy in biomedical implants and aerospace innovations. Particularly exciting is the perfect marriage between titanium and 3D printing.

Titanium materials are expensive and can be problematic when it comes to traditional processing technologies. For example, its high melting point (1,670?, much higher than steel alloys) is a challenge. The relatively low-cost precision of 3D printing is, therefore, a game-changer for titanium. 3D printing is where an object is built layer by layer and designers can create amazing shapes. This allows the production of complex shapes such as replacement parts of a jaw bone, heel, hip, dental implants, or cranioplasty plates in surgery. It can also be used to make golf clubs and aircraft components.

The CSIRO is working with industry to develop new technologies in 3D printing using titanium. Advances in 3D printing are opening up new avenues to further improve the function of customised body part implants made of titanium. Such implants can be designed to be porous, making them lighter but allowing blood, nutrients and nerves to pass through and can even promote bone in-growth.

Titanium is considered the most biocompatible metal – not harmful or toxic to living tissue – due to its resistance to corrosion from bodily fluids. This ability to withstand the harsh bodily environment is a result of the protective oxide film that forms naturally in the presence of oxygen.  Its ability to physically bond with bone also gives titanium an advantage over other materials that require the use of an adhesive to remain attached. Titanium implants last longer, and much larger forces are required to break the bonds that join them to the body compared with their alternatives.
Titanium alloys commonly used in load-bearing implants are significantly less stiff – and closer in performance to the human bone – than stainless steel or cobalt-based alloys.

Titanium weighs about half as much as steel but is 30% stronger, which makes it ideally suited to the aerospace industry where every gram matters.

In the late 1940s, the US government helped to get production of titanium going as it could see its potential for “aircraft, missiles, spacecraft, and other military purposes”.

Titanium has increasingly become the buy-to-fly material for aircraft designers striving to develop faster, lighter and more efficient aircraft. About 39% of the US Air Force's F22 Raptor, one of the most advanced fighter aircraft in the world, is made of titanium. Civil aviation moved in the same direction with Boeing's new 787 Dreamliner made of 15% titanium, significantly more than previous models.

Two key areas where titanium is used in airliners is in their landing gear and jet engines. Landing gear needs to withstand the massive amounts of force exerted on it every time a plane hits a runway. Titanium's toughness means it can absorb the huge amounts of energy expelled when a plane lands without ever weakening. Titanium's heat resistance means it can be used inside modern jet engines, where temperatures can reach 800?. Steel begins to soften at around 400? but titanium can withstand the intense heat of a jet engine without losing its strength.

All of the following applications of Titanium are mentioned in the passage EXCEPT

): The passage below is accompanied by a set of questions. Choose the best answer to each question.

The government has made two crucial clarifications on the e-auction process for captive coal blocks in order to make them more attractive to potential bidders. According to the changes introduced by the coal ministry, existing or upcoming power plants that don't have power purchase agreements (PPAs) with buyers of electricity will also be eligible to bid for the coal blocks. Also, the reserve price 100/tonne payable by the successful bidder will be included in the energy charge, which means that fuel cost that will be passed through to consumers will include reserve price along with the actual rate of coal at which the bid has been won. This could translate into bidders being willing to bid more aggressively and still manage to run a profitable business. The minutes of the meeting released by the ministry said: "power projects which do not have PPAs today but would be entering into PPAs (Case I bidding) in future also need to be covered explicitly.”
"Generators without PPAs have been in dilemma for some time. This was because states are unlikely to enter into PPAs with generators that do not have coal linkage and Coal India would refuse to give linkage to generators without PPAs. We have tried to correct the situation by allowing such generators to enter into the auction fray. Apart from the scarcity of coal that has led to more than 15,000 MW of generation capacity not being able to sign coal linkage pact with Coal India, the situation has been exacerbated by the loss-making state-owned distribution companies not shying away from signing pacts with power producers for long-term supply of power because of financial health. While there will not be any deadline in place for such capacity to enter into PPA's they will not be allowed to sell more than 15% of its capacity in the open market. These bidders will also have to pay an additional reserve price for the quantum of coal used for power sold in the merchant market, over and above the reserve price for other generators with long-term PPAs which is 100/ tonne.
 The clarification significantly invigorates the auction as there's considerable generation capacity without fully covered fuel supply, and generators can create an additional profit margin between the escalation offered in Case I bidding documents and the actual cost inflation. As regards the reserve price (which is to be paid to the state government) being a pass-through. For merchant power, the reserve price is higher; the new proposal will make sure that there are no extraordinary gains from open market sales. This is a safety feature as bidders would factor in the extra reserve price in their quoted prices."

Which of the following has been considered eligible to bid for the coal blocks after the changes introduced by the ministry?

The passage below is accompanied by a set of questions. Choose the best answer to each question.

The government has made two crucial clarifications on the e-auction process for captive coal blocks in order to make them more attractive to potential bidders. According to the changes introduced by the coal ministry, existing or upcoming power plants that don't have power purchase agreements (PPAs) with buyers of electricity will also be eligible to bid for the coal blocks. Also, the reserve price 100/tonne payable by the successful bidder will be included in the energy charge, which means that fuel cost that will be passed through to consumers will include reserve price along with the actual rate of coal at which the bid has been won. This could translate into bidders being willing to bid more aggressively and still manage to run a profitable business. The minutes of the meeting released by the ministry said: "power projects which do not have PPAs today but would be entering into PPAs (Case I bidding) in future also need to be covered explicitly.”
"Generators without PPAs have been in dilemma for some time. This was because states are unlikely to enter into PPAs with generators that do not have coal linkage and Coal India would refuse to give linkage to generators without PPAs. We have tried to correct the situation by allowing such generators to enter into the auction fray. Apart from the scarcity of coal that has led to more than 15,000 MW of generation capacity not being able to sign coal linkage pact with Coal India, the situation has been exacerbated by the loss-making state-owned distribution companies not shying away from signing pacts with power producers for long-term supply of power because of financial health. While there will not be any deadline in place for such capacity to enter into PPA's they will not be allowed to sell more than 15% of its capacity in the open market. These bidders will also have to pay an additional reserve price for the quantum of coal used for power sold in the merchant market, over and above the reserve price for other generators with long-term PPAs which is 100/ tonne.
 The clarification significantly invigorates the auction as there's considerable generation capacity without fully covered fuel supply, and generators can create an additional profit margin between the escalation offered in Case I bidding documents and the actual cost inflation. As regards the reserve price (which is to be paid to the state government) being a pass-through. For merchant power, the reserve price is higher; the new proposal will make sure that there are no extraordinary gains from open market sales. This is a safety feature as bidders would factor in the extra reserve price in their quoted prices."

What led to more than fifteen thousand M W of generation capacity inability to sign coal linkage pact with Coal India?

Direction (1-10): The passage below is accompanied by a set of questions. Choose the best answer to each question.

The government has made two crucial clarifications on the e-auction process for captive coal blocks in order to make them more attractive to potential bidders. According to the changes introduced by the coal ministry, existing or upcoming power plants that don't have power purchase agreements (PPAs) with buyers of electricity will also be eligible to bid for the coal blocks. Also, the reserve price 100/tonne payable by the successful bidder will be included in the energy charge, which means that fuel cost that will be passed through to consumers will include reserve price along with the actual rate of coal at which the bid has been won. This could translate into bidders being willing to bid more aggressively and still manage to run a profitable business. The minutes of the meeting released by the ministry said: "power projects which do not have PPAs today but would be entering into PPAs (Case I bidding) in future also need to be covered explicitly.”
"Generators without PPAs have been in dilemma for some time. This was because states are unlikely to enter into PPAs with generators that do not have coal linkage and Coal India would refuse to give linkage to generators without PPAs. We have tried to correct the situation by allowing such generators to enter into the auction fray. Apart from the scarcity of coal that has led to more than 15,000 MW of generation capacity not being able to sign coal linkage pact with Coal India, the situation has been exacerbated by the loss-making state-owned distribution companies not shying away from signing pacts with power producers for long-term supply of power because of financial health. While there will not be any deadline in place for such capacity to enter into PPA's they will not be allowed to sell more than 15% of its capacity in the open market. These bidders will also have to pay an additional reserve price for the quantum of coal used for power sold in the merchant market, over and above the reserve price for other generators with long-term PPAs which is 100/ tonne.
 The clarification significantly invigorates the auction as there's considerable generation capacity without fully covered fuel supply, and generators can create an additional profit margin between the escalation offered in Case I bidding documents and the actual cost inflation. As regards the reserve price (which is to be paid to the state government) being a pass-through. For merchant power, the reserve price is higher; the new proposal will make sure that there are no extraordinary gains from open market sales. This is a safety feature as bidders would factor in the extra reserve price in their quoted prices."

Question 1:
In the given passage for whom the reserve price is considered to be higher?

There is a sentence that is missing in the paragraph below. Look at the paragraph and decide in which blank (option 1, 2, 3, or 4) the following sentence would best fit.

Sentence: Roughly speaking, for every 10% increase in energy, the number of cosmic rays per unit area falls by a factor of 1000.

Cosmic Ray energies span a truly enormous range, from about 107 eV through to 1020 eV, but at higher energies the numbers of cosmic rays drop off dramatically. (1) __________.

Since cosmic rays are charged particles whose paths are affected by magnetic fields, determining where they originate is a challenge, and for the most part, an unsolved mystery. (2)__________. For all but the highest-energy cosmic rays (which remain largely unaffected by the magnetic fields), astronomers cannot simply trace the path of the cosmic rays back to their origin, but must infer their place of origin from their energies and composition. (3) __________. For the highest-energy cosmic rays, although in theory it should be possible to trace them back to their origin, their rate of detection is so low that there is no discernable stream of particles coming from any one particular direction. (4) ____________.