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  • Question

  • Thermit, used in thermit welding, is a mixture of


  • Options
  • A. charcoal and iron oxide
  • B. charcoal and aluminium
  • C. iron oxide and aluminium
  • D. charcoal, iron oxide and aluminium

  • Correct Answer
  • iron oxide and aluminium 

    • More questions

    • 1. The deformation of a bar under its own weight is __________ the deformation, if the same body is subjected to a direct load equal to weight of the body.

    • Options
    • A. equal to
    • B. half
    • C. double
    • D. quadruple
      • Discuss
    • 2. For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is

    • Options
    • A. reciprocating
    • B. rotating
    • C. centrifugal
    • D. screw
      • Discuss
    • 3. The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and ? = Nozzle angle)

    • Options
    • A. Vb = 0.5 V cos ?
    • B. Vb = V cos ?
    • C. Vb = 0.5 V2 cos ?
    • D. Vb = V2 cos?
      • Discuss
    • 4. The strain energy stored in a body, when suddenly loaded, is __________ the strain energy stored when same load is applied gradually.

    • Options
    • A. equal to
    • B. one-half
    • C. twice
    • D. four times
      • Discuss
    • 5. The maximum efficiency of a reaction turbine is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. The Locomotive boiler has

    • Options
    • A. 137 fire tubes and 44 superheated tubes
    • B. 147 fire tubes and 34 superheated tubes
    • C. 157 fire tubes and 24 superheated tubes
    • D. 167 fire tubes and 14 superheated tubes
      • Discuss
    • 7. A casting defect which occurs due to improper venting of sand is known as

    • Options
    • A. cold shuts
    • B. blow holes
    • C. shift
    • D. swell
      • Discuss
    • 8. The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called

    • Options
    • A. specific heat at constant volume
    • B. specific heat at constant pressure
    • C. kilo-Joule
    • D. none of these
      • Discuss
    • 9. The dressing and truing of grinding wheel are done with the same tools but not for the same purpose.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 10. A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The centre of gravity of the section will lie

    • Options
    • A. in the shaded area
    • B. in the hole
    • C. at O
      • Discuss

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