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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
  • Question

  • The transfer of heat by molecular collision is known as


  • Options
  • A. conduction
  • B. convection
  • C. radiation
  • D. none of these

  • Correct Answer
  • conduction 

    • More questions

    • 1. A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

    • Options
    • A. Reynold's number
    • B. Grashoff's number
    • C. Reynold's number, Grashoff's number
    • D. Prandtl number, Grashoff's number
      • Discuss
    • 3. The engine torque increases with the increase in engine speed up to a certain point after which it starts to fall down.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. In the below figure, the point E represents the maximum stress.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. In oblique cutting system, the tool may or may not generate a surface parallel to the workface.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. The advantage of having a tandem master cylinder arrangement in automobiles is that it

    • Options
    • A. enhances safety by serving two independent lines in a divided-line brake circuit
    • B. enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
    • C. supplies equal fluid pressure to each line of a divided-line brake circuit, thereby preventing the brakes from dragging on one side
    • D. boosts the brake fluid pressure to reduce the force required to depress the brake pedal
      • Discuss
    • 7. The material in which the atoms are arranged regularly in some directions but not in others, is called

    • Options
    • A. amorphous material
    • B. mesomorphous material
    • C. crystalline material
    • D. none of these
      • Discuss
    • 8. Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

    • Options
    • A. high neutron absorption cross-section
    • B. low moderating efficiency
    • C. high neutron scatter cross-section
    • D. low neutron absorption cross-section
      • Discuss
    • 9. Manganese is added in low carbon steel to

    • Options
    • A. make the steel tougher and harder
    • B. raise the yield point
    • C. make the steel ductile and of good bending qualities
    • D. all of the above
      • Discuss
    • 10. Free carbon in iron makes the metal

    • Options
    • A. soft and gives a coarse grained crystalline structure
    • B. soft and gives a fine grained crystalline structure
    • C. hard and gives a coarse grained crystalline structure
    • D. hard and gives a fine grained crystalline structure
      • Discuss

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