Home⇒ Engineering⇒
Electromagnetic induction
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ Air-core coils are practically free from both (a) and (b) [other wrong options] [Discuss in forum] |
| Q2 ⇒ For a purely inductive circuit which of
the following is true ? Actual power of the circuit is zero [other wrong options] [Discuss in forum] |
| 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. 100 N [other wrong options] [Discuss in forum] |
| Q4 ⇒ Current changing from 8 A to 12 A in
one second induced 20 volts in a coil.
The value of inductance is 5 H [other wrong options] [Discuss in forum] |
| Q5 ⇒ Which of the following circuit element
stores energy in the electromagnetic
field? Inductance [other wrong options] [Discuss in forum] |
| Q6 ⇒ The magnitude of the induced e.m.f. in
a conductor depends on the rate of change of flux-linkages [other wrong options] [Discuss in forum] |
| Q7 ⇒ Which of the following is unit of inductance? Henry [other wrong options] [Discuss in forum] |
| Q8 ⇒ A coil with negligible resistance has 50
V across it with 10 mA. The inductive
reactance is 5000 ohms [other wrong options] [Discuss in forum] |
| Q9 ⇒ Which circuit element(s) will oppose
the change in circuit current? Inductance only [other wrong options] [Discuss in forum] |
| Q10 ⇒ The inductance df a coil will increase
under all the following conditions
except when more length for the same number of turns is provided [other wrong options] [Discuss in forum] |
| Q11 ⇒ Mutually inductance between two
magnetically-coupled coils depends on all of the above [other wrong options] [Discuss in forum] |
| Q12 ⇒ An e.m.f. of 16 volts is induced in a coil
of inductance 4 H. The rate of change of
current must be 4 A/s [other wrong options] [Discuss in forum] |
| Q13 ⇒ The co-efficient of coupling between
two air core coils depends on mutual inductance and self inductance of two coils [other wrong options] [Discuss in forum] |
| Q14 ⇒ A crack in the magnetic path of an
inductor will result in reduced inductance [other wrong options] [Discuss in forum] |
| Q15 ⇒ Higher the self-inductance of a coil, longer the dela' in establishing steady current through it [other wrong options] [Discuss in forum] |
| Q16 ⇒ A laminated iron core has reduced
eddy-current losses because the laminations are insulated from each other [other wrong options] [Discuss in forum] |
| Q17 ⇒ The core of a coil has a length of 200
mm. The inductance of coil is 6 mH. If
the core length is doubled, all other
quantities, remaining the same, the inductance
will be 3 mH [other wrong options] [Discuss in forum] |
| Q18 ⇒ An averaVoltage of 10 V is induced
in a 250 turns solenoid as a result of a
change in flux which occurs in 0.5
second. The total flux change is 0.02 Wb [other wrong options] [Discuss in forum] |
| Q19 ⇒ In an iron cored coil the iron core is
removed so that the coil becomes an air
cored coil. The inductance of the coil
will decrease [other wrong options] [Discuss in forum] |
| Q20 ⇒ The co-efficient of self-inductance for a
coil is given as NΦ/I [other wrong options] [Discuss in forum] |
| Or |