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**Home⇒ Engineering⇒ Electromagnetic induction**

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Q1 ⇒ Air-core coils are practically free fromboth (a) and (b)[other wrong options] [Discuss in forum] hysteresis losses eddy current losses none of the above |

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] Apparent power is zero Relative power is zero Any capacitance even if present in the circuit will not be charged |

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] 400 N 600 N 1000 N |

Q4 ⇒ Current changing from 8 A to 12 A in
one second induced 20 volts in a coil.
The value of inductance is5 H[other wrong options] [Discuss in forum] 5 mH 10 mH 10 H |

Q5 ⇒ Which of the following circuit element
stores energy in the electromagnetic
field?Inductance[other wrong options] [Discuss in forum] Condenser Variable resistor Resistance |

Q6 ⇒ The magnitude of the induced e.m.f. in
a conductor depends on therate of change of flux-linkages[other wrong options] [Discuss in forum] flux density of the magnetic field amount of flux cut amount of flux linkages |

Q7 ⇒ Which of the following is unit of inductance?Henry[other wrong options] [Discuss in forum] Ohm Ampere turns Webers/metre |

Q8 ⇒ A coil with negligible resistance has 50
V across it with 10 mA. The inductive
reactance is5000 ohms[other wrong options] [Discuss in forum] 50 ohms 500 ohms 1000 ohms |

Q9 ⇒ Which circuit element(s) will oppose
the change in circuit current?Inductance only[other wrong options] [Discuss in forum] Resistance only Capacitance only Inductance and capacitance |

Q10 ⇒ The inductance df a coil will increase
under all the following conditions
exceptwhen more length for the same
number of turns is provided[other wrong options] [Discuss in forum] when the number of turns of the coil
increase when more area for each turn is provided when permeability of the core increases |

Q11 ⇒ Mutually inductance between two
magnetically-coupled coils depends onall of the above[other wrong options] [Discuss in forum] permeability of the core the number of their turns cross-sectional area of their common core |

Q12 ⇒ An e.m.f. of 16 volts is induced in a coil
of inductance 4 H. The rate of change of
current must be4 A/s[other wrong options] [Discuss in forum] 64 A/s 32 A/s 16 A/s |

Q13 ⇒ The co-efficient of coupling between
two air core coils depends onmutual inductance and self inductance
of two coils[other wrong options] [Discuss in forum] self-inductance of two coils only mutual inductance between two coils only none of the above |

Q14 ⇒ A crack in the magnetic path of an
inductor will result inreduced inductance[other wrong options] [Discuss in forum] unchanged inductance increased inductance zero inductance |

Q15 ⇒ Higher the self-inductance of a coil,longer the dela' in establishing
steady current through it[other wrong options] [Discuss in forum] lesser its weher-turns lower the e.m.f. induced greater the flux produced by it |

Q16 ⇒ A laminated iron core has reduced
eddy-current losses becausethe laminations are insulated from
each other[other wrong options] [Discuss in forum] more wire can he used with less
D.C. resistance in coil the magnetic flux is concentrated in the air gap of the core the laminations are stacked vertically |

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 be3 mH[other wrong options] [Discuss in forum] 12 mH 24 mH 48 mH |

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 is0.02 Wb[other wrong options] [Discuss in forum] 20 Wb 2 Wb 0.2 Wb |

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
willdecrease[other wrong options] [Discuss in forum] increase remain the same initially increase and then decrease |

Q20 ⇒ The co-efficient of self-inductance for a
coil is given asNΦ/I[other wrong options] [Discuss in forum] NI/Φ NI ^{2}/Φ NΦ/I ^{2} |

Or |