Two similar mutually coupled coils have a total inductance of 900 mH and coefficient of coupling 0.5. The self inductance of each coils is

Electronics and Communication Engineering (ECE) : Networks Analysis and Synthesis - Quiz(MCQ)

300 mH

150 mH

75 mH

50 mH

Correct Answer : Option (A) : 300 mH

Explanation : M = k√L₁L₂, L₁ = L₂ = L, M = kL. Total inductance = L₁ + L₂ + 2M = 2L + 2kL = 900 mH or L(2 + 2 x 0.5) = 900 or L = 300 mH.

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Ohm's law is valid for

dc voltage and current

ac voltage and current

dc and ac voltages and currents

all voltages and current

Correct Answer : all voltages and current

Explanation : KCL and KVL are valid for voltages and currents of all wave shapes during transient as well as steady state conductions.

If e = 110 sin (ωt + p/3) and i = 5 sin (ωt - p/3), the impedance of the circuit is

11 Ω

16 Ω

22 Ω

30.8 Ω

Correct Answer : 22 Ω

Explaination :

Two phasors having rms values V₁ and V₂ which are added to give a phasor having rms value V₃. V₃ is maximum if phase angle between V₁ and V₂ is

90°

180°

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Correct Answer :

360°

Explaination : Sum of phasors is maximum if they are in phase and 360° = 0.