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ONLINE MCQ EE-ILLUMINATION 7

Harikesh Yadav
Q61. A mercury vapour lamp gives ____ light.
 A.  white
 [Wrong Answer]		  B.  pink
 [Wrong Answer]
 C.  yellow
 [Wrong Answer]		  D.  greenish blue
 [Correct Answer]
$(document).ready(function(){
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Q62. In an incandescent lamp bird cage filament is usually used in vacuum bulb so as to
 A.  reduce the oxidation phenomenon
 [Wrong Answer]		  B.  reduce the convection losses
 [Wrong Answer]
 C.  have uniform radiations
 [Correct Answer]		  D.  increase the life span of the filament
 [Wrong Answer]
$(document).ready(function(){
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$(‘#getrequest2205’).html(ajaxresult);

qid2205=$(‘#qid2205’).val(”);
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Q63. Soft shadows are produced by
 A.  using surface source of light instead of point source of light
 [Wrong Answer]		  B.  increasing the number of lamps
 [Wrong Answer]
 C.  both (a) and (b)
 [Correct Answer]		  D.  none of the above
 [Wrong Answer]
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qid2206=$(‘#qid2206’).val(”);
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Q64. Fine diameter tungsten wires are made by
 A.  turning
 [Wrong Answer]		  B.  swaging
 [Wrong Answer]
 C.  compressing
 [Wrong Answer]		  D.  wire drawing
 [Correct Answer]
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qid2207=$(‘#qid2207’).val(”);
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subtype2207=$(‘#subtype2207’).val(”);
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Q65. On which of the following factors does the depreciation or maintenance factor depend ?
 A.  Lamp cleaning schedule
 [Wrong Answer]		  B.  Ageing of the lamp
 [Wrong Answer]
 C.  Type of work carried out at the premises
 [Wrong Answer]		  D.  All of above
 [Correct Answer]
$(document).ready(function(){
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$(‘#getrequest2208’).html(ajaxresult);

qid2208=$(‘#qid2208’).val(”);
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Q66. Due to moonlight, illumination is nearly
 A.  3000 lumens/m2
 [Wrong Answer]		  B.  300 lumens/m2
 [Wrong Answer]
 C.   30 lumens/m2
 [Wrong Answer]		  D.  0.3 lumen/m2
 [Correct Answer]
$(document).ready(function(){
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$.post(‘../../fav’,{ qid:qid2209, section: section2209, type: type2209, subtype: subtype2209 },function(ajaxresult){
$(‘#getrequest2209’).html(ajaxresult);

qid2209=$(‘#qid2209’).val(”);
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Q67. In electric discharge lamps for stabilizing the arc
 A.  a reactive choke is connected in series with the supply
 [Correct Answer]		  B.  a condenser is connected in series to the supply
 [Wrong Answer]
 C.  a condenser is connected in parallel to the supply
 [Wrong Answer]		  D.  a variable resistor is connected in the circuit
 [Wrong Answer]
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$.post(‘../../fav’,{ qid:qid2210, section: section2210, type: type2210, subtype: subtype2210 },function(ajaxresult){
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qid2210=$(‘#qid2210’).val(”);
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Q68. Sometimes the wheels ofrotating machi­nery, under the influence of fluorescent lamps appear to be stationary. This is due to the
 A.  low power factor
 [Wrong Answer]		  B.  stroboscopic effect
 [Correct Answer]
 C.  fluctuations
 [Wrong Answer]		  D.  luminescence effect
 [Wrong Answer]
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$.post(‘../../fav’,{ qid:qid2211, section: section2211, type: type2211, subtype: subtype2211 },function(ajaxresult){
$(‘#getrequest2211’).html(ajaxresult);

qid2211=$(‘#qid2211’).val(”);
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type2211=$(‘#type2211’).val(”);
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Q69. Stroboscopic effect due to use of discharge lamps in workshops results in moving machinery appearing
 A.  stationary
 [Wrong Answer]		  B.  stationary running slow
 [Wrong Answer]
 C.  stationary running in reverse direc­tion
 [Wrong Answer]		  D.  all of the above
 [Correct Answer]
$(document).ready(function(){
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qid2212=$(‘#qid2212’).val();
section2212=$(‘#section2212’).val();
type2212=$(‘#type2212’).val();
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$.post(‘../../fav’,{ qid:qid2212, section: section2212, type: type2212, subtype: subtype2212 },function(ajaxresult){
$(‘#getrequest2212’).html(ajaxresult);

qid2212=$(‘#qid2212’).val(”);
section2212=$(‘#section2212’).val(”);
type2212=$(‘#type2212’).val(”);
subtype2212=$(‘#subtype2212’).val(”);
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Q70. Reflectors are provided with slits at the top to
 A.  introduce chimney effect for clean­ing
 [Wrong Answer]		  B.  reduce colour contrast
 [Wrong Answer]
 C.  reduce heating effect
 [Wrong Answer]		  D.  do all of the above functions
 [Correct Answer]
$(document).ready(function(){
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qid2213=$(‘#qid2213’).val();
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type2213=$(‘#type2213’).val();
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$.post(‘../../fav’,{ qid:qid2213, section: section2213, type: type2213, subtype: subtype2213 },function(ajaxresult){
$(‘#getrequest2213’).html(ajaxresult);

qid2213=$(‘#qid2213’).val(”);
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