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Q1. | For a purely inductive circuit which of the following is true ? |

A. | Apparent power is zero [Wrong Answer] |

B. | Relative power is zero [Wrong Answer] |

C. | Actual power of the circuit is zero [Correct Answer] |

D. | Any capacitance even if present in the circuit will not be charged [Wrong Answer] |

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Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ 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

32 mH

38 mH

40 mH

48 mH

⇒ 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

⇒ Ifcurrentin a conductor increases then according to Lenz's law self-induced voltage will

aid the increasing current

tend to decrease the amount of current

produce current opposite to the increasing current

aid tite applied voltage

⇒ 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

⇒ 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

12 mH

24 mH

48 mH

⇒ 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

⇒ Which of the following circuit elements will oppose the change in circuit current?

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

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increased inductance

zero inductance

reduced inductance

⇒ Lenz's law is a consecluence of the law of conservation of

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charge

enery

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⇒ Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be

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8 H

12 H

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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

20 Wb

2 Wb

0.2 Wb

0.02 Wb

⇒ 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

self-inductance

mutual inductance

series aiding inductace

capacitance

⇒ 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

10 V

15 V

25 V

50 V

⇒ Two 300 µH coils in series without mutual coupling have a total inductance of

300 µH

600 µH

150 µH

75 µH

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

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when the number of turns of the coil increase

when more area for each turn is provided

when permeability of the core increases

⇒ In case of an inductance, current is proportional to

voltage across the inductance

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both (a) and (b)

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

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Lenz

Newton

Coulomb

⇒ 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

400 N

600 N

1000 N

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the laminations are insulated from each other

the magnetic flux is concentrated in the air gap of the core

the laminations are stacked vertically

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halved

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

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⇒ The co-efficient of self-inductance for a coil is given as

NI/Φ

NΦ/I

NI

^{2}/Φ

NΦ/I

^{2}

⇒ Which circuit element(s) will oppose the change in circuit current?

Resistance only

Inductance only

Capacitance only

Inductance and capacitance

⇒ An open coil has

zero resistance and inductance

infinite resistance and zero inductance

infinite resistance and normal inductance

zero resistance and high inductance

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

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Lenz's law

Fleming's right hand rule

Kirchhoffs voltage law

⇒ Higher the self-inductance of a coil,

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lower the e.m.f. induced

greater the flux produced by it

longer the dela' in establishing steady current through it

⇒ Which of the following is unit of inductance?

Ohm

Henry

Ampere turns

Webers/metre