Technical Online Test 1

30 Questions | Total Attempts: 46

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Technical Online Test 1

Questions and Answers
  • 1. 
    The brake power of a diesel engine, keeping other parameters constant, can be increased by
    • A. 

      Increasing the pressure of intake air

    • B. 

      Increasing the temperature of intake air

    • C. 

      Decreasing the density of intake air

    • D. 

      Decreasing the pressure of intake air

  • 2. 
    The object of supercharging the engine is
    • A. 

      A,B, and C

    • B. 

      To reduce mass ofthe engine per brake power

    • C. 

      To reduce space occupied by the engine

    • D. 

      To increase the power output of an engine when greater power is required

  • 3. 
    The expansion of fuel in a four stroke cycle diesel engine
    • A. 

      Starts at 15° after top dead centre and ends at 30° before bottom dead centre

    • B. 

      Starts at 15° before top dead centre and ends at 30° after top dead centre

    • C. 

      Starts at top dead centre and ends at 30° after top dead centre

    • D. 

      May start and end anywhere

  • 4. 
    In a diesel engine, the duration between the time of injection and ignition, is known as
    • A. 

      Delay Period

    • B. 

      Pre ignition period

    • C. 

      Ignition period

    • D. 

      Burning period

  • 5. 
    In a pertol engine, fixing other parameters, supercharging ________ knocking tendency
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      No effect

    • D. 

      Depend on other parameters

  • 6. 
    ______ is an inhibitor of preignition
    • A. 

      Water

    • B. 

      Alchohol

    • C. 

      TEL

    • D. 

      None

  • 7. 
    Air standard Thermal Efficiency of a diesel engine is
    • A. 

      70%

    • B. 

      50%

    • C. 

      35%

    • D. 

      80%

  • 8. 
    A carburettor is used to mix and supply
    • A. 

      Petrol and Air

    • B. 

      Diesel and Air

    • C. 

      Petrol and Lubricating oil

    • D. 

      Petrol, air and Lubricating oil

  • 9. 
    The injection pressure in a diesel engine is about
    • A. 

      100 bar

    • B. 

      150 bar

    • C. 

      50 bar

    • D. 

      200 bar

  • 10. 
    High speed compression engine operates on
    • A. 

      Dual cycle

    • B. 

      Rankine Cycle

    • C. 

      Otto Cycle

    • D. 

      Diesel Cycle

  • 11. 
    The higher combustion chamber wall temperature in compression ignition engines will _____ knocking tendency
    • A. 

      Decrease

    • B. 

      Increase

    • C. 

      No effect

    • D. 

      Depend on other parameters

  • 12. 
    The theoretically correct mixture of air and petrol is
    • A. 

      15:1

    • B. 

      18:1

    • C. 

      13:1

    • D. 

      9:1

  • 13. 
    Which of the following test you prefer for a single cylinder petrol engine to find its Frictional power?
    • A. 

      Willans line method

    • B. 

      Blow by loss method

    • C. 

      Morse test

    • D. 

      None

  • 14. 
    Typical overlapping period of an SI engine is
    • A. 

      25

    • B. 

      10

    • C. 

      50

    • D. 

      100

  • 15. 
    Which of the following power is greater?
    • A. 

      Indicated power

    • B. 

      Brake Power

    • C. 

      Frictional power

    • D. 

      Driving power

  • 16. 
    Typical secondary voltage given to spark plug is in the range of
    • A. 

      20KV

    • B. 

      5KV

    • C. 

      12V

    • D. 

      100V

  • 17. 
    The operation of forcing additional air under pressure into the engine cylinder is known as
    • A. 

      Supercharging

    • B. 

      Carburation

    • C. 

      Turbulence

    • D. 

      Delay period

  • 18. 
    The compression ignition engines are governed by
    • A. 

      Qualitative governing

    • B. 

      Quantitative governing

    • C. 

      Both quantitative and Qualitative governing

    • D. 

      Hit and miss governing

  • 19. 
    A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of
    • A. 

      75% iso-octane and 25% normal heptane

    • B. 

      75% normal heptane and 25% iso-octane

    • C. 

      75% petrol and 25% diesel

    • D. 

      75% diesel and 25% petrol

  • 20. 
    By higher octane number of spark ignition fuel, it is meant that the fuel has
    • A. 

      Longer ignition delay

    • B. 

      Higher flash point

    • C. 

      Higher heating value

    • D. 

      Lower volatility

  • 21. 
    If petrol is used in a diesel engine, then
    • A. 

      Higher knocking will occur

    • B. 

      Black smoke will be produced

    • C. 

      Efficiency will be low

    • D. 

      Low power will be produced

  • 22. 
    N a coil ignition system of petrol engines, a condenser is connected across the contact-breaker in order to
    • A. 

      Both reasons are right

    • B. 

      Prevent sparking across the gap between the points

    • C. 

      Provide a higher voltage in the secondary circuit

    • D. 

      None of the options are right

  • 23. 
    The ignition quality of petrol is expressed by
    • A. 

      Octane number

    • B. 

      All of the options are right

    • C. 

      Cetane number

    • D. 

      Calorific value

  • 24. 
    Diesel as compared to petrol is
    • A. 

      Less difficult to ignite

    • B. 

      More difficult to ignite

    • C. 

      Highly ignitable

    • D. 

      None of the options are right

  • 25. 
    In a four stroke cycle engine, the sequence of operations is
    • A. 

      Suction, compression, expansion and exhaust

    • B. 

      Suction, expansion, compression and exhaust

    • C. 

      Expansion, compression, suction and exhaust

    • D. 

      Compression, expansion, suction and exhaust

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