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MCQs

Total Questions : 53 | Page 2 of 6 pages
Question 11. The electrode of a direct arc furnace is made of
  1.    Tungsten
  2.    Graphite
  3.    Silver
  4.    Copper
 Discuss Question
Answer: Option B. -> Graphite
Question 12. By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
  1.    Coreless transformers
  2.    Current transformers
  3.    Motor-generator set
  4.    Multiphase transformer
 Discuss Question
Answer: Option C. -> Motor-generator set
Question 13. In a resistance furnace the atmosphere is
  1.    Oxidizing
  2.    Deoxidizing
  3.    Reducing
  4.    Neutral
 Discuss Question
Answer: Option A. -> Oxidizing
Question 14. In an electric press mica is used
  1.    As an insulator
  2.    As a device for power factor improvement
  3.    For dielectric heating
  4.    For induction heating
 Discuss Question
Answer: Option A. -> As an insulator
Question 15. The temperature inside a furnace is usually measured by which of the following?
  1.    Optical pyrometer
  2.    Mercury thermometer
  3.    Alcohol thermometer
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Optical pyrometer
Question 16. Radiant heating is used for which of the following?
  1.    Annealing of metals
  2.    Melting of ferrous metals
  3.    Heating of liquids in electric kettle
  4.    Drying of paints and varnishes
 Discuss Question
Answer: Option D. -> Drying of paints and varnishes
Question 17. Induction heating takes place in which of the following?
  1.    Insulating materials
  2.    Conducting materials which are magnetic
  3.    Conducting materials which are nonmagnetic
  4.    Conducting materials which may or may not be magnetic
 Discuss Question
Answer: Option D. -> Conducting materials which may or may not be magnetic
Question 18. Induction furnaces are employed for which of the following?
  1.    Heat treatment of castings
  2.    Heating of insulators
  3.    Melting aluminium
  4.    None of the above
 Discuss Question
Answer: Option A. -> Heat treatment of castings
Question 19. In an electric room heat convector the method of heating used is
  1.    Arc heating
  2.    Resistance heating
  3.    Induction heating
  4.    Dielectric heating
 Discuss Question
Answer: Option B. -> Resistance heating
Question 20. In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.
  1.    bad, good
  2.    bad, bad
  3.    good, bad
  4.    good, good
 Discuss Question
Answer: Option C. -> good, bad

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