ONLINE MCQ EE-Electrical Heating 3

Q11. The electrode of a direct arc furnace is made of
 A.  tungsten
 [Wrong Answer]
 B.  graphite
 [Correct Answer]
 C.  silver
 [Wrong Answer]
 D.  copper
 [Wrong Answer]
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Q12. ____ method has leading power factor
 A.  Resistance heating
 [Wrong Answer]
 B.  Dielectric heating
 [Correct Answer]
 C.  Arc heating
 [Wrong Answer]
 D.  Induction heating
 [Wrong Answer]
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Q13. Which of the following has the highest value of thermal conductivity ?
 A.  Water
 [Wrong Answer]
 B.  Steam
 [Wrong Answer]
 C.  Solid ice
 [Correct Answer]
 D.  Melting ice
 [Wrong Answer]
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Q14. In induction heating ____ is abnormally high.
 A.  phase angle
 [Wrong Answer]
 B.  frequency
 [Correct Answer]
 C.  current
 [Wrong Answer]
 D.  voltage
 [Wrong Answer]
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Q15. For intermittent work which of the following furnaces is suitable ?
 A.  Indirect arc furnace
 [Correct Answer]
 B.  Core less furnace
 [Wrong Answer]
 C.  Either of the above
 [Wrong Answer]
 D.  None of the above
 [Wrong Answer]
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Q16. In electric press, mica is used because it is ____ conductor of heat but/and ____ conductor of electricity.
 A.  bad, good
 [Wrong Answer]
 B.  bad, bad
 [Wrong Answer]
 C.  good, bad
 [Correct Answer]
 D.  good, good
 [Wrong Answer]
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Q17. Direct arc furnaces have which of the following power factors ?
 A.  Unity
 [Wrong Answer]
 B.  Low, lagging
 [Correct Answer]
 C.  Low, leading
 [Wrong Answer]
 D.  Any of the above
 [Wrong Answer]
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Q18. ____ is used for heating non-conducting materials.
 A.  Eddy current heating
 [Wrong Answer]
 B.  Arc heating
 [Wrong Answer]
 C.  Induction heating
 [Wrong Answer]
 D.  Dielectric heating
 [Correct Answer]
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Q19. Induction heating process is based on which of the following principles ?
 A.  Thermal ion release principle
 [Wrong Answer]
 B.  Nucleate heating principle
 [Wrong Answer]
 C.  Resistance heating principle
 [Wrong Answer]
 D.  Electro-magnetic induction principle
 [Correct Answer]
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Q20. By the use of which of the following, high frequency power supply for induc­tion furnaces can be obtained ?
 A.  Coreless transformers
 [Wrong Answer]
 B.  Current transformers
 [Wrong Answer]
 C.  Motor-generator set
 [Correct Answer]
 D.  Multi-phase transformer
 [Wrong Answer]
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QUIZ OF DAY-30/01/2017 GK & CURRENT AFFAIRS
ONLINE MCQ EE-Electrical Heating 2

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