Question: What is the name of the jet engines that are primarily used on the Airbus A350?
Context: The Rolls-Royce Trent 7000 is the seventh iteration of the Trent family of large turbofan jet engine and is the exclusive engine for the Airbus A330neo.  The Trent 7000 is based on the Trent 1000-TEN architecture from the Boeing 787 and the technology of the Trent XWB of the Airbus A350 XWB. A jet engine is a reaction engine discharging a fast-moving jet that generates thrust by jet propulsion.  This broad definition includes airbreathing jet engines (turbojets, turbofans, ramjets, and pulse jets) and non-airbreathing jet engines (such as rocket engines).  In general, jet engines are combustion engines. An airbreathing jet engine (or "ducted jet engine") is a jet engine propelled by a jet of hot exhaust gases formed from heated and expanded air that is drawn into the engine via a compressor, typically a centrifugal or axial type.  They are typically gas turbine engines.  The opposite of airbreathing jet engines are non-airbreathing jet engines, such as rocket engines, for example, which are propelled by a jet of hot gases created by the chemical reaction of two or more compounds internally.  While the majority of the mass flow of an airbreathing jet engine is provided by air taken from outside of the engine and heated internally, using energy stored in the form of fuel, a rocket engine's fuel provides both the energy and the mass flow to create thrust. A precooled jet engine is a concept for high speed jet engines that features a cryogenic fuel-cooled heat exchanger immediately after the air intake to precool the air entering the engine.  After gaining heat and vapourising in the heat exchanger system, the fuel (e.g. H) burns in the combustor.  Precooled jet engines have never flown but are predicted to have much higher thrust and efficiency at speeds up to Mach 5.5.  Precooled jet engines were described by Robert P. Carmichael in 1955. A jet airliner (or jetliner) is an airliner powered by jet engines (passenger jet aircraft).  Airliners usually have two or four jet engines; three-engined designs were popular in the 1970s but are less common today. The Airbus A350 XWB is a family of long-range, twin-engine wide-body jet airliners developed by European aircraft manufacturer Airbus.  The A350 is the first Airbus aircraft with both fuselage and wing structures made primarily of carbon-fibre-reinforced polymer.  Its variants seat 280 to 366 passengers in typical three-class seating layouts.  The A350 is positioned to succeed the A340, and compete with the Boeing 787 and 777. The Philippine Airlines fleet composed of wide-body and narrow-body aircraft from four families (excluding PAL Express fleet): Airbus A320, Airbus A330, Airbus A340, its flagship Boeing 777, and it has the Airbus A350 on order.  As of 2 January 2017, there were 55 aircraft registered in the PAL fleet. The Singapore Airlines fleet features exclusively wide-body aircraft from four aircraft families: the Boeing 777, Airbus A380, Airbus A350, and the Airbus A330.  As of 31 August 2017, there were 110 aircraft registered in the Singapore Airlines fleet. The Rolls-Royce Trent XWB is a British series of turbofan jet engines developed from the Rolls-Royce Trent 1000.  It is presently used only on the Airbus A350 XWB. The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion.  The word "turbofan" is a portmanteau of "turbine" and "fan": the "turbo" portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the "fan", a ducted fan that uses the mechanical energy from the gas turbine to accelerate air rearwards.  Thus, whereas all the air taken in by a turbojet passes through the turbine (through the combustion chamber), in a turbofan some of that air bypasses the turbine.  A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of those contributing to the thrust.  The ratio of the mass-flow of air bypassing the engine core compared to the mass-flow of air passing through the core is referred to as the bypass ratio.  The engine produces thrust through a combination of these two portions working together; engines that use more jet thrust relative to fan thrust are known as "low-bypass turbofans", conversely those that have considerably more fan thrust than jet thrust are known as "high-bypass".  Most commercial aviation jet engines in use today are of the high-bypass type, and most modern military fighter engines are low-bypass.  Afterburners are not used on high-bypass turbofan engines but may be used on either low-bypass turbofan or turbojet engines.
Answer: Rolls-Royce Trent XWB