Reading passages


wheel brakes is to --------



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Reading passages

wheel brakes is to --------.
A) act as a steering aid 
B) prevent the craft from moving during engine warm- up 
C) keep the aircraft steady after landing 
D) prevent the aircraft from landing at very high speeds 
E) assist in the dissipation of energy on landing 
 
269- We learn from the passage that the high landing speed of a large aeroplane ------


 
 
189 
--.
A) has been one of the determining factors in the design of brakes of a large aeroplanes 
B) is proportional to its weigh 
C) opened the way to a more scientific study of friction 
D) has occasionally led to wheel-locking 
E) only becomes a problem on poor runways 
270- In the passage, it is stated that the braking system of a small aeroplane --------.
A) differs little from that of a larger aeroplane 
B) is not very different from that of ordinary road- vehicles 
C) cannot be used to control the speed of the aeroplane after landing 
D) is specially designed for coping with high speed landings 
E) is both power-operated and manual 
 
The greatest advantage of electrification on railways is that it is both pleasant and 
efficient. It brings the removal of a smoke nuisance from tunnels and from the 
vicinity of larger cities. Moreover, owing to high acceleration, it is possible to provide 
a more frequent and faster service on densely populated suburban lines. The track 
capacity is improved by electrification on mountainous lines because of increase of 
speed both up and down the gradient, generally using electric forms of braking in the 
latter case. Some of the major electrification schemes of the world, for example those 
in Switzerland and Sweden, have been emerged owing to the desire to operate the 

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