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  • Question

  • A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness


  • Options
  • A. 0.5 m
  • B. 0.1 m
  • C. 0.2 m
  • D. 0.5 m

  • Correct Answer
  • 0.1 m 

    • More questions

    • 1. If the value of n = 0 in the equation pvn = C, then the process is called

    • Options
    • A. constant volume process
    • B. adiabatic process
    • C. constant pressure process
    • D. isothermal process
      • Discuss
    • 2. The strain energy stored in a hollow circular shaft of outer diameter (D) and inner diameter (d) subjected to shear stress is

    • Options
    • A. x Volume of shaft
    • B. x Volume of shaft
    • C. x Volume of shaft
    • D. x Volume of shaft
      • Discuss
    • 3. Which of the following display properties similar to that of steel?

    • Options
    • A. Blackheart cast iron
    • B. Whiteheart cast iron
    • C. both (a) and (b)
    • D. none of these
      • Discuss
    • 4. If the modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the material is equal to zero.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 5. The unit of work in S.I. units is

    • Options
    • A. newton
    • B. erg
    • C. kg-m
    • D. joule
      • Discuss
    • 6. In a centre lathe, the cutting tool is fed in __________ with reference to the lathe axis.

    • Options
    • A. cross direction only
    • B. longitudinal direction only
    • C. both cross and longitudinal direction
    • D. any direction
      • Discuss
    • 7. In a __________ , two or more operations are performed simultaneously at the single stroke of the ram.

    • Options
    • A. simple die
    • B. progressive die
    • C. combination die
    • D. compound die
      • Discuss
    • 8. The delay period in compression ignition engines depends upon

    • Options
    • A. temperature and pressure in the cylinder at the time of injection
    • B. nature of the fuel mixture strength
    • C. relative velocity between the fuel injection and air turbulence pressure of residual gases
    • D. all of the above
      • Discuss
    • 9. The law of motion involved in the recoil of gun is

    • Options
    • A. Newton's first law of motion
    • B. Newton's second law of motion
    • C. Newton's third law of motion
    • D. none of these
      • Discuss
    • 10. The critical pressure ratio (p2/p1) is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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