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ONLINE MCQ EE-Electrical Heating 4

Harikesh Yadav
Q21. Due to which of the following reasons it is desirable to have short arc length ?
 A.  To achieve better heating
 [Wrong Answer]		  B.  To increase the life of roof refractory
 [Wrong Answer]
 C.  To have better stirring action
 [Wrong Answer]		  D.  To reduce problem of oxidation
 [Wrong Answer]
 E.  All of the above
 [Correct Answer]
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View Answer  . 

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