ONLINE MCQ EE-Electrical Heating 3

Q11. The electrode of a direct arc furnace is made of
A.  tungsten
B.  graphite
C.  silver
D.  copper
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Q12. ____ method has leading power factor
A.  Resistance heating
B.  Dielectric heating
C.  Arc heating
D.  Induction heating
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Q13. Which of the following has the highest value of thermal conductivity ?
A.  Water
B.  Steam
C.  Solid ice
D.  Melting ice
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Q14. In induction heating ____ is abnormally high.
A.  phase angle
B.  frequency
C.  current
D.  voltage
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Q15. For intermittent work which of the following furnaces is suitable ?
A.  Indirect arc furnace
B.  Core less furnace
C.  Either of the above
D.  None of the above
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Q16. In electric press, mica is used because it is ____ conductor of heat but/and ____ conductor of electricity.
D.  good, good
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Q17. Direct arc furnaces have which of the following power factors ?
A.  Unity
B.  Low, lagging
D.  Any of the above
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Q18. ____ is used for heating non-conducting materials.
A.  Eddy current heating
B.  Arc heating
C.  Induction heating
D.  Dielectric heating
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Q19. Induction heating process is based on which of the following principles ?
A.  Thermal ion release principle
B.  Nucleate heating principle
C.  Resistance heating principle