Page 44 - UKCAT 2017

PRACTICE QUESTIONS
The gearbox acts to reduce the rotation of the inlet fan to around a third of the turbine inside the engine. This creates a 15% improvement in fuel efficiency and a smaller, lighter housing.
VR5-1 If airlines adopt aircraft with ‘greener’ credentials by 2020, they will be considered for exemption from the Emissions Trading Scheme by the European Union.
VR5-3 When comparing normal turbofan design to geared turbofans, two of the greatest differences are the size and weight of the chambers housing the engine components.
A.
B.
C.
True False Can’t Tell
VR5-4 According to the EU, by 2020 airlines will contribute 3% of total greenhouse gas emissions across Europe.
VR5-2 Airline manufacturers are concentrating solely on the
development of lighter, more fuel-ef cient engines to meet the stringent emissions tariffs set by the European Union.
A. B. C.
True False Can’t Tell
A.
B.
C.
True False Can’t Tell
A. B. C.
True False Can’t Tell
Verbal Reasoning
VR6 – Arctic Foxes
Research into the variation in numbers
of the arctic fox has shown that, in areas where there is a population of small rodents, the number of foxes is associated with the numbers of rodents. The fox populations respond to increased food availability by increasing reproduction. However, in areas where there are no small rodents eg Svalbard in Norway, the picture is more complex.
Prior to 1973, the diaries of polar bear trappers (who took the bear furs, but left the carcasses) reported ourishing populations of arctic foxes.
After 1973, when the polar bear became a protected species, both the trappers and the reports of foxes declined.
Researchers estimated the fox numbers in Svalbard by several methods including a ‘capture index’ (the number of live foxes trapped in baited traps) and an ‘observation index’ (based on sightings by scientists and local people). Estimated numbers of foxes uctuated: they were low in 1990/1991, rose from 1992 to 1995, and then dropped so sharply in autumn 1995 that they seemed to have disappeared from the area by 1996. Fox tracks were not observed again until autumn 1996.
44 UKCAT Of cial Guide 2017