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Q1. | Which circuit element(s) will oppose the change in circuit current? |

A. | Resistance only [Wrong Answer] |

B. | Inductance only [Correct Answer] |

C. | Capacitance only [Wrong Answer] |

D. | Inductance and capacitance [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

50 ohms

500 ohms

1000 ohms

5000 ohms

⇒ A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be

6 mH

14 mH

24 mH

48 mH

⇒ Which of the following inductor will have the least eddy current losses?

Air core

Laminated iron core

Iron core

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⇒ A crack in the magnetic path of an inductor will result in

unchanged inductance

increased inductance

zero inductance

reduced inductance

⇒ Which of the following is unit of inductance?

Ohm

Henry

Ampere turns

Webers/metre

⇒ For a purely inductive circuit which of the following is true ?

Apparent power is zero

Relative power is zero

Actual power of the circuit is zero

Any capacitance even if present in the circuit will not be charged

⇒ The inductance df a coil will increase under all the following conditions except

when more length for the same number of turns is provided

when the number of turns of the coil increase

when more area for each turn is provided

when permeability of the core increases

⇒ An e.m.f. of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

64 A/s

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16 A/s

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⇒ Which of the following is not a unit of inductance?

Henry

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Volt second per ampere

All of the above

⇒ In case of an inductance, current is proportional to

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both (a) and (b)

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⇒ A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?

0.01 s

0.1 s

0.5 s

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⇒ 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

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decrease

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initially increase and then decrease

⇒ A coil is wound on iron core which carries current I. The self induced voltage in the coil is not affected by

variation in coil current

variation in voltage to the coil

change of number of turns of coil

the resistance of magnetic path

⇒ As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

lies perpendicular to the magnetic flux

lies in a magnetic field

cuts magnetic flux

moves parallel to the direction of the magnetic field

⇒ Mutually inductance between two magnetically-coupled coils depends on

permeability of the core

the number of their turns

cross-sectional area of their common core

all of the above

⇒ A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly

50 N

120 N

240 N

480 N

⇒ The direction of induced e.m.f. can be found by

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Fleming's right hand rule

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⇒ The property of coil by which a counter e.m.f. is induced in it when the current through the coil chatiges is known as

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mutual inductance

series aiding inductace

capacitance

⇒ 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

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⇒ The law that the induced e.m.f. and current always oppose the cause producing them is due to

Faraday

Lenz

Newton

Coulomb

⇒ The magnitude of the induced e.m.f. in a conductor depends on the

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rate of change of flux-linkages

⇒ Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

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⇒ Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

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⇒ 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

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⇒ A conductor 2 metres long moves at right angles to a magnetic field of flux densit 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be

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15 V

25 V

50 V

⇒ Higher the self-inductance of a coil,

lesser its weher-turns

lower the e.m.f. induced

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longer the dela' in establishing steady current through it

⇒ A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

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250 mH

150 mH

⇒ 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.

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400 N

600 N

1000 N

⇒ A laminated iron core has reduced eddy-current losses because

more wire can he used with less D.C. resistance in coil

the laminations are insulated from each other

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the laminations are stacked vertically

⇒ The self inductances of two coils are 8 mH and 18 mH If the co-efficients of coupling is 0.5, the mutual inductance of the coils is

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