# ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 1

Q1. Air-core coils are practically free from
A.  hysteresis losses
B.  eddy current losses
C.  both (a) and (b)
D.  none of the above
 \$(document).ready(function(){ \$(‘#loaddata2100’).click(function(){ qid2100=\$(‘#qid2100’).val(); section2100=\$(‘#section2100’).val(); type2100=\$(‘#type2100’).val(); subtype2100=\$(‘#subtype2100’).val(); \$.post(‘../../fav’,{ qid:qid2100, section: section2100, type: type2100, subtype: subtype2100 },function(ajaxresult){ \$(‘#getrequest2100’).html(ajaxresult); qid2100=\$(‘#qid2100’).val(”); section2100=\$(‘#section2100’).val(”); type2100=\$(‘#type2100’).val(”); subtype2100=\$(‘#subtype2100’).val(”); }); }); }); Explanation:- Answer : C

Q2. For a purely inductive circuit which of
the following is true ?
A.  Apparent power is zero
B.  Relative power is zero
C.  Actual power of the circuit is zero
D.  Any capacitance even if present in
the circuit will not be charged
 \$(document).ready(function(){ \$(‘#loaddata2101’).click(function(){ qid2101=\$(‘#qid2101’).val(); section2101=\$(‘#section2101’).val(); type2101=\$(‘#type2101’).val(); subtype2101=\$(‘#subtype2101’).val(); \$.post(‘../../fav’,{ qid:qid2101, section: section2101, type: type2101, subtype: subtype2101 },function(ajaxresult){ \$(‘#getrequest2101’).html(ajaxresult); qid2101=\$(‘#qid2101’).val(”); section2101=\$(‘#section2101’).val(”); type2101=\$(‘#type2101’).val(”); subtype2101=\$(‘#subtype2101’).val(”); }); }); }); Explanation:- Answer : C

Q3. Find the force acting on a conductor 3m
long carrying a current of 50 amperes
at right angles to a magnetic field
having a flux density of 0.67 tesla.
A.  100 N
B.  400 N
C.  600 N
D.  1000 N
 \$(document).ready(function(){ \$(‘#loaddata2102’).click(function(){ qid2102=\$(‘#qid2102’).val(); section2102=\$(‘#section2102’).val(); type2102=\$(‘#type2102’).val(); subtype2102=\$(‘#subtype2102’).val(); \$.post(‘../../fav’,{ qid:qid2102, section: section2102, type: type2102, subtype: subtype2102 },function(ajaxresult){ \$(‘#getrequest2102’).html(ajaxresult); qid2102=\$(‘#qid2102’).val(”); section2102=\$(‘#section2102’).val(”); type2102=\$(‘#type2102’).val(”); subtype2102=\$(‘#subtype2102’).val(”); }); }); }); Explanation:- Answer : A

Q4. Current changing from 8 A to 12 A in
one second induced 20 volts in a coil.
The value of inductance is
A.  5 mH
B.  10 mH
C.  5 H
D.  10 H
 \$(document).ready(function(){ \$(‘#loaddata2103’).click(function(){ qid2103=\$(‘#qid2103’).val(); section2103=\$(‘#section2103’).val(); type2103=\$(‘#type2103’).val(); subtype2103=\$(‘#subtype2103’).val(); \$.post(‘../../fav’,{ qid:qid2103, section: section2103, type: type2103, subtype: subtype2103 },function(ajaxresult){ \$(‘#getrequest2103’).html(ajaxresult); qid2103=\$(‘#qid2103’).val(”); section2103=\$(‘#section2103’).val(”); type2103=\$(‘#type2103’).val(”); subtype2103=\$(‘#subtype2103’).val(”); }); }); }); Explanation:- Answer : C

Q5. Which of the following circuit element
stores energy in the electromagnetic
field?
A.  Inductance
B.  Condenser
C.  Variable resistor
D.  Resistance
 \$(document).ready(function(){ \$(‘#loaddata2104’).click(function(){ qid2104=\$(‘#qid2104’).val(); section2104=\$(‘#section2104’).val(); type2104=\$(‘#type2104’).val(); subtype2104=\$(‘#subtype2104’).val(); \$.post(‘../../fav’,{ qid:qid2104, section: section2104, type: type2104, subtype: subtype2104 },function(ajaxresult){ \$(‘#getrequest2104’).html(ajaxresult); qid2104=\$(‘#qid2104’).val(”); section2104=\$(‘#section2104’).val(”); type2104=\$(‘#type2104’).val(”); subtype2104=\$(‘#subtype2104’).val(”); }); }); }); Explanation:- Answer : A

Q6. The magnitude of the induced e.m.f. in
a conductor depends on the
A.  flux density of the magnetic field
B.  amount of flux cut
D.  rate of change of flux-linkages
 \$(document).ready(function(){ \$(‘#loaddata2105’).click(function(){ qid2105=\$(‘#qid2105’).val(); section2105=\$(‘#section2105’).val(); type2105=\$(‘#type2105’).val(); subtype2105=\$(‘#subtype2105’).val(); \$.post(‘../../fav’,{ qid:qid2105, section: section2105, type: type2105, subtype: subtype2105 },function(ajaxresult){ \$(‘#getrequest2105’).html(ajaxresult); qid2105=\$(‘#qid2105’).val(”); section2105=\$(‘#section2105’).val(”); type2105=\$(‘#type2105’).val(”); subtype2105=\$(‘#subtype2105’).val(”); }); }); }); Explanation:- Answer : D

Q7. Which of the following is unit of inductance?
A.  Ohm
B.  Henry
C.  Ampere turns
D.  Webers/metre
 \$(document).ready(function(){ \$(‘#loaddata2106’).click(function(){ qid2106=\$(‘#qid2106’).val(); section2106=\$(‘#section2106’).val(); type2106=\$(‘#type2106’).val(); subtype2106=\$(‘#subtype2106’).val(); \$.post(‘../../fav’,{ qid:qid2106, section: section2106, type: type2106, subtype: subtype2106 },function(ajaxresult){ \$(‘#getrequest2106’).html(ajaxresult); qid2106=\$(‘#qid2106’).val(”); section2106=\$(‘#section2106’).val(”); type2106=\$(‘#type2106’).val(”); subtype2106=\$(‘#subtype2106’).val(”); }); }); }); Explanation:- Answer : B

Q8. A coil with negligible resistance has 50
V across it with 10 mA. The inductive
reactance is
A.  50 ohms
B.  500 ohms
C.  1000 ohms
D.  5000 ohms
 \$(document).ready(function(){ \$(‘#loaddata2107’).click(function(){ qid2107=\$(‘#qid2107’).val(); section2107=\$(‘#section2107’).val(); type2107=\$(‘#type2107’).val(); subtype2107=\$(‘#subtype2107’).val(); \$.post(‘../../fav’,{ qid:qid2107, section: section2107, type: type2107, subtype: subtype2107 },function(ajaxresult){ \$(‘#getrequest2107’).html(ajaxresult); qid2107=\$(‘#qid2107’).val(”); section2107=\$(‘#section2107’).val(”); type2107=\$(‘#type2107’).val(”); subtype2107=\$(‘#subtype2107’).val(”); }); }); }); Explanation:- Answer : D

Q9. Which circuit element(s) will oppose
the change in circuit current?
A.  Resistance only
B.  Inductance only
C.  Capacitance only
D.  Inductance and capacitance
 \$(document).ready(function(){ \$(‘#loaddata2108’).click(function(){ qid2108=\$(‘#qid2108’).val(); section2108=\$(‘#section2108’).val(); type2108=\$(‘#type2108’).val(); subtype2108=\$(‘#subtype2108’).val(); \$.post(‘../../fav’,{ qid:qid2108, section: section2108, type: type2108, subtype: subtype2108 },function(ajaxresult){ \$(‘#getrequest2108’).html(ajaxresult); qid2108=\$(‘#qid2108’).val(”); section2108=\$(‘#section2108’).val(”); type2108=\$(‘#type2108’).val(”); subtype2108=\$(‘#subtype2108’).val(”); }); }); }); Explanation:- Answer : B

Q10. The inductance of a coil will increase
under all the following conditions
except
A.  when more length for the same
number of turns is provided