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  • Question

  • The function of oil-control rings is that it


  • Options
  • A. lubricates the cylinder wall by releasing oil from its hole
  • B. keeps the cylinder wall lubricated by holding oil in its channel
  • C. prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
  • D. maintains a seal and prevents escape of burned gases and oil leakage

  • Correct Answer
  • prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan 

    • More questions

    • 1. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. The efficiency of a riveted joint is the ratio of the strength of the joint to the strength of the solid plate.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In case of solids, the heat transfer takes place according to radiation.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. The emissivity for a black body is

    • Options
    • A. 0
    • B. 0.5
    • C. 0.75
    • D. 1
      • Discuss
    • 5. The coefficient of performance of Heat Pump is always __________ one.

    • Options
    • A. equal to
    • B. less than
    • C. greater than
      • Discuss
    • 6. In permanent mould casting method

    • Options
    • A. molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
    • B. molten metal is poured and allowed to solidify while the mould is revolving
    • C. molten metal is forced into mould under high pressure
    • D. none of the above
      • Discuss
    • 7. In a psychrometric chart, specific humidity (moisture content) lines are

    • Options
    • A. vertical and uniformly spaced
    • B. horizontal and uniformly spaced
    • C. horizontal and non-uniformly spaced
    • D. curved lines
      • Discuss
    • 8. If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be

    • Options
    • A. same
    • B. half
    • C. double
      • Discuss
    • 9. A pressure vessel is said to be a thick shell, when

    • Options
    • A. it is made of thick sheets
    • B. the internal pressure is very high
    • C. the ratio of wall thickness of the vessel to its diameter is less than 1/10.
    • D. the ratio of wall thickness of the vessel to its diameter is greater than 1/10.
      • Discuss
    • 10. Slip of a reciprocating pump is defined as the

    • Options
    • A. ratio of actual discharge to the theoretical discharge
    • B. sum of actual discharge and the theoretical discharge
    • C. difference of theoretical discharge and the actual discharge
    • D. product of theoretical discharge and the actual discharge
      • Discuss

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