Lakshya Education MCQs

Question: In heating the ferromagnetic material by induction heating, heat is produced due to
Options:
A.Induced current flow through the charge
B.Hysteresis loss taking place below Curie temperature
C.Due to hysteresis loss as well as eddy current loss taking place in the charge
D.None of the above factors
Answer: Option C

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More Questions on This Topic :

Question 1. Which of the following is an advantage of heating by electricity?
  1.    Quicker operation
  2.    Higher efficiency
  3.    Absence of flue gases
  4.    All of the above
Answer: Option D
Question 2. In a domestic cake baking oven the temperature is controlled by
  1.    Voltage variation
  2.    Thermostat
  3.    Autotransformer
  4.    Series-parallel operation
Answer: Option D
Question 3. Which of the following will happen if the thickness of refractory wall of furnace is increased?
  1.    Heat loss through furnace wall will increase
  2.    Temperature inside the furnace will fall
  3.    Temperature on the outer surface of furnace walls will drop
  4.    Energy consumption will increase
Answer: Option C
Question 4. Resistance variation method of temperature control is done by connecting resistance elements in
  1.    Series
  2.    Parallel
  3.    Series-parallel connections
  4.    All of the above ways
Answer: Option D
Question 5. In an electric room heat convector the method of heating used is Resistance heating
  1.    True
  2.    False
Answer: Option A
Question 6. It is desirable to operate the arc furnaces at power factor of
  1.    Zero
  2.    0.707 lagging
  3.    Unity
  4.    0.707 leading
Answer: Option B

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