Electrical Engineering MCQs

Page No. 178

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


a50 ohms


b500 ohms


c1000 ohms


d5000 ohms


View Answer 5000 ohms

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______________?


a50 N


b120 N


c240 N


d480 N


View Answer 120 N

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?


a10 V


b15 V


c25V


d50V


View Answer 25V

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_____________?


a 6 H


b8 H


c12 H


d24 H


View Answer 12 H

Lenz’s law is a consequence of the law of conservation of__________?


ainduced current


b charge


cenergy


dinduced e.m.f.


View Answer energy

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?


a2.0


b1.0


c0.5


dzero


View Answer 1.0

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___________?


a6 mH


b 14 mH


c24 mH


d 48 mH


View Answer 48 mH

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______________?


a4 mH


b 5 mH


c 6 mH


d12 mH


View Answer 6 mH

In case of an inductance, current is proportional to___________?


avoltage across the inductance


bmagnetic field


c both A. and B.


d neither (A) nor (B)


View Answer magnetic field

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


aApparent 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



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