Electric Heating MCQs

51. Absorptivity of a perfect black body is

  1. Zero
  2. 0-1
  3. 1
  4. Cannot be determined

Answer. c

52. Microwave ovens operate at a frequency of

  1. 2.45 GHz
  2. 1.37 GHz
  3. 5.52 GHz
  4. 3.37 GHz

Answer. a

53. A freshly painted layer may be dried electronically by

  1. Convective heating
  2. Induction heating
  3. Dielectric heating
  4. Emissive heating

Answer. c

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