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  • Question

  • The aluminium alloy is used in cylinder blocks because


  • Options
  • A. it is lighter and have good heat dissipation characteristics
  • B. material cost is low
  • C. it does not require any cylinder liners
  • D. the piston is also made of aluminium alloy

  • Correct Answer
  • it is lighter and have good heat dissipation characteristics 

    • More questions

    • 1. The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and ? = Ratio of specific heats)

    • Options
    • A. 1 - r? - 1
    • B. 1 + r? - 1
    • C.
    • D.
      • Discuss
    • 2. The final relative humidity of the air during cooling and dehumidification is generally __________ than that of entering air.

    • Options
    • A. lower
    • B. higher
      • Discuss
    • 3. The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then

    • Options
    • A. P = Q
    • B. Q = R
    • C. Q = 2R
    • D. none of these
      • Discuss
    • 4. During heating and dehumidification process, dry bulb temperature

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 5. The value of the wave length for maximum emissive power is given by

    • Options
    • A. Kirchhoff's law
    • B. Stefan's law
    • C. Wein's law
    • D. Planck's law
      • Discuss
    • 6. The application of third type levers is found in

    • Options
    • A. handle of a hand pump
    • B. hand wheel of a punching press
    • C. lever of a loaded safety valve
    • D. a pair of tongs
      • Discuss
    • 7. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by(where ? = Deflection of the spring.)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. De-Laval turbine is a

    • Options
    • A. simple impulse turbine
    • B. simple reaction turbine
    • C. impulse-reaction turbine
    • D. none of these
      • Discuss
    • 9. 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
      • Discuss
    • 10. Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is __________ as that of shaft 'A'.

    • Options
    • A. 1/6
    • B. 1/8
    • C. 1/4
    • D. 15/16
      • Discuss

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