Automobile Engineering MCQs with answers Page - 13

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Q. Which of the following symptoms will not show that the combustion is necessarily complete or not?

  • (A) Presence of free carbon in exhaust
  • (B) Presence of carbon monoxide in the exhaust
  • (C) Presence of oxygen is the exhaust
  • (D) Presence of nitrogen in the exhaust

A

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Q. The turbulence in diesel engine ensures to

  • (A) Increase the compression pressure
  • (B) Reduce the engine vibrations
  • (C) Bring the fuel quickly in contact with air
  • (D) Increase the fuel consumption

A

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Q. In a 2-stroke S.I. engine

  • (A) exhaust and transfer (inlet) ports open and cloe simultaneously
  • (B) exhaust port opens 5? before the transfer port and closes 5? after the transfer port
  • (C) exhaust port opens 5? ahead of the transfer port but both ports close simultaneously
  • (D) none of the above

A

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Q. In a S.I. engine, if the colour of exhaust flame is bluish, transparent, it indicates that the mixture supplied to the engine is

  • (A) Suitable for maximum output
  • (B) Too lean
  • (C) Too rich
  • (D) Chemical correct

A

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Q. The escape of burned gases from the combustion chamber past the pistons and into the crank case is called

  • (A) Gas-loss
  • (B) Crank case explosion
  • (C) By-pass
  • (D) Blow-by

A

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Q. Which instrument is used to measure specific gravity

  • (A) Thermometer
  • (B) Hydrometer
  • (C) Hydrometer
  • (D) Anemometer

A

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Q. The stationary part of the Wankel engine has an inner contour of

  • (A) elliptical section
  • (B) two lobed epitrochoid section
  • (C) four lobed epitrochoid section
  • (D) none of the above

A

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Q. The efficiency of an oil bath type air cleaner is usually

  • (A) 90%
  • (B) 50%
  • (C) 60%
  • (D) 99%

A

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Q. LPG mainly consists of

  • (A) Methane and ethane
  • (B) Propane and butane
  • (C) Petrol and diesel
  • (D) Hexane and butadiene

A

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Q. Over heating of a two stroke air cooled engine cannot be due to

  • (A) Incorrect ignition or valve timing
  • (B) Too lean fuel mixture
  • (C) Lack of cylinder jacket cooling water
  • (D) Partly restricted exhaust system

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