# ONLINE MCQ EE-Electrical Heating 2

Q1. Heat is transferred simultaneously by condition, convection and radiation
A.  inside boiler furnaces
B.  during melting of ice
C.  through the surface of the insulted pipe carrying steam
D.  from refrigerator coils to freezer of a refrigerator
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Q2. In a resistance furnace the atmosphere is ____
A.  oxidising
B.  deoxidising
C.  reducing
D.  neutral
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Q3. For heating element high resistivity material is chosen to
A.  reduce the length of heating ele­ment
B.  increase the life of the heating ele­ment
C.  reduce the effect of oxidation
D.  produce large amount of heat
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Q4. In arc furnace the function of choke is
A.  to stabilize the arc
B.  to improve power factor
C.  to reduce severity of the surge
D.  none of the above
 \$(document).ready(function(){ \$(‘#loaddata1197’).click(function(){ qid1197=\$(‘#qid1197’).val(); section1197=\$(‘#section1197’).val(); type1197=\$(‘#type1197’).val(); subtype1197=\$(‘#subtype1197’).val(); \$.post(‘../../fav’,{ qid:qid1197, section: section1197, type: type1197, subtype: subtype1197 },function(ajaxresult){ \$(‘#getrequest1197’).html(ajaxresult); qid1197=\$(‘#qid1197’).val(”); section1197=\$(‘#section1197’).val(”); type1197=\$(‘#type1197’).val(”); subtype1197=\$(‘#subtype1197’).val(”); }); }); }); Explanation:- Answer : A
Q5. Which of the following is an advantage of eddy current heating ?
A.  The amount of heat generated can be controlled accurately
B.  Heat at very high rate can be generated
C.  The area of the surface over which heat is produced can be accurately controlled
D.  All of the above
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Q6. Which of the following heating methods has maximum power factor ?
A.  Arc heating
B.  Dielectric heating
C.  Induction heating
D.  Resistance heating
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Q7. The
process of heat transfer during the re-entry of satellites and
missiles, at very high speeds, into earths atmos­phere is known as
A.  ablation
C.  viscous dissipation
 \$(document).ready(function(){ \$(‘#loaddata1200’).click(function(){ qid1200=\$(‘#qid1200’).val(); section1200=\$(‘#section1200’).val(); type1200=\$(‘#type1200’).val(); subtype1200=\$(‘#subtype1200’).val(); \$.post(‘../../fav’,{ qid:qid1200, section: section1200, type: type1200, subtype: subtype1200 },function(ajaxresult){ \$(‘#getrequest1200’).html(ajaxresult); qid1200=\$(‘#qid1200’).val(”); section1200=\$(‘#section1200’).val(”); type1200=\$(‘#type1200’).val(”); subtype1200=\$(‘#subtype1200’).val(”); }); }); }); Explanation:- Answer : A
Q8. By which of the following methods the temperature inside a resistance fur­nace can be varied ?
A.  By disconnecting some of the heat­ing elements
B.  By varying the operating voltage
C.  By varying the current through heating elements
D.  By any of the above method
 \$(document).ready(function(){ \$(‘#loaddata1201’).click(function(){ qid1201=\$(‘#qid1201’).val(); section1201=\$(‘#section1201’).val(); type1201=\$(‘#type1201’).val(); subtype1201=\$(‘#subtype1201’).val(); \$.post(‘../../fav’,{ qid:qid1201, section: section1201, type: type1201, subtype: subtype1201 },function(ajaxresult){ \$(‘#getrequest1201’).html(ajaxresult); qid1201=\$(‘#qid1201’).val(”); section1201=\$(‘#section1201’).val(”); type1201=\$(‘#type1201’).val(”); subtype1201=\$(‘#subtype1201’).val(”); }); }); }); Explanation:- Answer : D
Q9. In resistance heating highest working temperature is obtained from heating elements made of ____
A.  nickel copper
B.  nichrome
C.  silicon carbide