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Q99 (IAS/2000) Science & Technology › New Materials, Energy & Environment-linked Tech › Advanced materials and nanotech Answer Verified

Consider the following features of newer models of motor cars : I. Radial tyres II. Streamlined body III. Multipoint fuel injection IV. Catalytic converter with exhaust Which of these features make the newer models of motor cars more fuel efficient ?

Result
Your answer: —  ·  Correct: B
Explanation

A streamlined body reduces aerodynamic drag and therefore lowers fuel consumption at speed by cutting the work the engine must do to overcome air resistance [1]. Multipoint (multi‑port) fuel injection gives far better control over air–fuel mixture and timing than older carburettor systems, improving combustion efficiency and reducing specific fuel consumption [2]. By contrast, catalytic converters are fitted primarily to reduce harmful exhaust pollutants (NOx, CO, HC) rather than to improve fuel economy; their purpose is emission control rather than increasing engine efficiency [2]. Hence, the combination of streamlined body and multipoint fuel injection (II and III) best explains increased fuel efficiency in newer models.

Sources

  1. [1] https://www.aceee.org/sites/default/files/pdfs/t912.pdf
  2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > Control measuresi > p. 69
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