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  • Question

  • In a spark plug, when the temperature of the central electrode exceeds a certain temperature, any carbon that has adhered will be burnt off, and the temperature at which this burning off carbon starts is referred to as the self cleaning temperature.


  • Options
  • A. Correct
  • B. Incorrect

  • Correct Answer
  • Correct 

    • More questions

    • 1. The blade velocity coefficient is ratio of relative velocity of steam at outlet tip of the blade to the relative velocity of steam at inlet tip of the blade.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (?) and rotating at (?) rad/s is

    • Options
    • A. ? ?2 r2
    • B. 2? ?2 r2
    • C.
    • D.
      • Discuss
    • 3. Lancashire boiler is used where working pressure and power required are

    • Options
    • A. low
    • B. moderate
    • C. high
    • D. none of these
      • Discuss
    • 4. The Rankine's theory for active earth pressure is based on the assumption that

    • Options
    • A. the retained material is homogeneous and cohesionless
    • B. the frictional resistance between the retaining wall and the retained material is neglected
    • C. the failure of the retained material takes place along a plane called rupture plane
    • D. all of the above
      • Discuss
    • 5. The seat belt will move out smoothly when pulled out slowly, but it will lock when pulled quickly.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 6. The diesel engines are also known as __________ engines.

    • Options
    • A. compression ignition
    • B. spark ignition
      • Discuss
    • 7. The expansion of fuel in a four stroke cycle diesel engine

    • Options
    • A. starts at 15° before top dead centre and ends at 30° after top dead centre
    • B. starts at top dead centre and ends at 30° after top dead centre
    • C. starts at 15° after top dead centre and ends at 30° before bottom dead centre
    • D. may start and end anywhere
      • Discuss
    • 8. The time taken by a particle for one complete oscillation is known as periodic time.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 9. The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

    • Options
    • A. 0.34 times
    • B. 0.67 times
    • C. 0.81 times
    • D. 0.95 times
      • Discuss
    • 10. The by-pass factor of a cooling coil decreases with

    • Options
    • A. decrease in fin spacing and increase in number of rows
    • B. increase in fin spacing and increase in number of rows
    • C. increase in fin spacing and decrease in number of rows
    • D. decrease in fin spacing and decrease in number of rows
      • Discuss

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