ONLINE MCQ EE-Electrical Heating 6

Q41. Which of the following will happen if the thickness of refractory wall of furnace is increased ?
 A.  Heat loss through furnace wall will increase
 [Wrong Answer]
 B.  Temperature inside the furnace will fall
 [Wrong Answer]
 C.  Temperature on the outer surface of furnace walls will drop
 [Correct Answer]
 D.  Energy consumption will increase
 [Wrong Answer]
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Q42. In an electric press mica is used
 A.  as an insulator
 [Correct Answer]
 B.  as a device for power factor im­provement
 [Wrong Answer]
 C.  for dielectric heating
 [Wrong Answer]
 D.  for induction heating
 [Wrong Answer]
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Q43. It is desirable to operate the arc fur­naces at power factor of
 A.  zero
 [Wrong Answer]
 B.  0.707 lagging
 [Correct Answer]
 C.  unity
 [Wrong Answer]
 D.  0.707 leading
 [Wrong Answer]
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Q44. Which of the following devices is necessarily required for automatic tempera­ture control in a furnace ?
 A.  Thermostat
 [Wrong Answer]
 B.  Thermocouple
 [Correct Answer]
 C.  Auto-transformer
 [Wrong Answer]
 D.  Heating elements of variable resistance material
 [Wrong Answer]
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Q45. Which of the following is an advantage of heating by electricity ?
 A.  Quicker operation
 [Wrong Answer]
 B.  Higher efficiency
 [Wrong Answer]
 C.  Absence of flue gases
 [Wrong Answer]
 D.  All of the above
 [Correct Answer]
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Q46. A perfect black body is one that
 A.  transmits all incident radiations
 [Wrong Answer]
 B.  absorbs all incident radiations
 [Correct Answer]
 C.  reflects all incident radiations
 [Wrong Answer]
 D.  absorbs, reflects and transmits all incident radiations
 [Wrong Answer]
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Q47. The material of the heating element for a furnace should have
 A.  lower melting point
 [Wrong Answer]
 B.  higher temperature co-efficient
 [Wrong Answer]
 C.  high specific resistance
 [Correct Answer]
 D.  all of the above
 [Wrong Answer]
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Q48. Induction heating takes place in which of the following ?
 A.  Insulating materials
 [Wrong Answer]
 B.  Conducting materials which are magnetic
 [Wrong Answer]
 C.  Conducting materials which are non-magnetic
 [Wrong Answer]
 D.  Conducting materials which may or may not be magnetic
 [Correct Answer]
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Q49. Radiations from source,proportional to a black body are
 A.  T
 [Wrong Answer]
 B.  T2
 [Wrong Answer]
 C.  T3
 [Wrong Answer]
 D.  T4
 [Correct Answer]
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Q50. For radiant heating around 2250°C, the heating elements are made of
 A.  copper alloy
 [Wrong Answer]
 B.  carbon
 [Wrong Answer]
 C.  tungsten alloy
 [Correct Answer]
 D.  stainless steel alloy
 [Wrong Answer]
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Electrical Engineering Interview Question And Answer-Electrical Machine Part 1
ONLINE MCQ EE-Electrical Heating 5

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