Electromagnetics Set 18

Electrical Engineering

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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 18

Q1 | The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is0.5, the mutual inductance of the coils is
Q2 | Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. Ifthe two coils are connected in series aiding, the total inductance will be
Q3 | A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400turns, all other quantities (area, length etc.) remaining the same, the inductance will be
Q4 | Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. Ifthe two coils are connected in series, the total inductance will be
Q5 | In case all the flux from the current in coil 1 links with coil 2, the co-efficient of couplingwill be
Q6 | A coil with negligible resistance has 50V across it with 10 mA. The inductive reactanceis
Q7 | Lenz's law is a consequence of the law of conservation of
Q8 | 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
Q9 | Find the force acting on a conductor 3m long carrying a current of 50 amperes at rightangles to a magnetic field having a flux density of 0.67 tesla.
Q10 | The co-efficient of coupling between two air core coils depends on
Q11 | An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change influx which occurs in 0.5 second. The total flux change is
Q12 | A 500 turns solenoid develops an average induced voltage of 60 V. Over what timeinterval must a flux change of 0.06 Wb occur to produce such a voltage ?
Q13 | Which of the fpllowing inductor will have the least eddy current losses ?
Q14 | A coil induces 350 mV when the current changes at the rate of 1 A/s. The value ofinductance is
Q15 | Two 300 uH coils in series without mutual coupling have a total inductance of
Q16 | Current changing from 8 A to 12 A in one second induced 20 volts in a coil.The value of inductance is
Q17 | Which circuit element(s) will oppose the change in circuit current ?
Q18 | A crack in the magnetic path of an inductor will result in
Q19 | A coil is wound on iron core which carries current I. The self-induced voltage in the coilis not affected by
Q20 | Which of the following parameters is not a primary parameter?
Q21 | The networks in which the R, L, C parameters are individually concentrated orlumped at discrete points in the circuit are called
Q22 | The lines having R, L, C distributed along the circuit are called
Q23 | Which primary parameter is uniformly distributed along the length of theconductor?
Q24 | The primary parameter that is associated with the magnetic flux linkage is
Q25 | The primary parameter that is associated with the electric charges is
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