ONLINE MCQ EE-Electrical Heating 4

Q21. Due to which of the following reasons it is desirable to have short arc length ?
A.  To achieve better heating
B.  To increase the life of roof refractory
C.  To have better stirring action
D.  To reduce problem of oxidation
E.  All of the above
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Q22. Resistance variation method of temperature control is done by connecting resis­tance elements in
A.  series
B.  parallel
C.  series-parallel connections
D.  star-delta connections
E.  all of the above ways
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Q23. In direct arc furnace which of the following has high value ?
A.  Current
B.  Voltage
C.  Power factor
D.  All of the above
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Q24. Which of the following methods of heating is not dependent on the frequency of supply ?
A.  Induction heating
B.  Dielectric heating
C.  Electric resistance heating
D.  All of the above
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Q25. Which of the following insulating materials is suitable for low temperature applica­tions?
A.  Asbestos paper
B.  Diatomaceous earth
C.  80 percent magnesia
D.  Cork
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Q26. Induction furnaces are employed for which of the following?
A.  Heat treatment of castings
B.  Heating of insulators
C.  Melting aluminum
D.  None of the above
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Q27. In the indirect resistance heating method, maximum heat-transfer takes place by
B.  convection
C.  conduction
D.  any of the above
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Q28. Hysteresis loss and eddy current loss are used in
A.  induction heating of steel
B.  dielectric heating
C.  induction heating of brass
D.  resistance heating
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Q29. When a body reflects entire radiation incident on it, then it is known as
A.  white body
B.  grey body
C.  black body
D.  transparent body
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Q30. A non-dimensional number generally associated with natural convection heat transfer is
A.  Prandt1 number