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Exam Questions Papers - Engineering

Q1:

The equation for loop currents I1 and I2 are __________

A

B

C

D

ANS:C -

k = 0.8 ∴ M = kL1L2 = 0.83 x 2 = 1.95 H Apply KVL to loop 1 200∠0° = (j5 + 5 + j2 - j3)I1 + 1.95I2 ∴ 200∠0° = (5 + j4)I1 + j1.95I2 Apply KVL to loop 2 0 = (5 + 3 + j3)I2 + j1.95I1 0 = (8 + j3)I2 + j1.95I1 0 = j1.95I1 + (8 + j3)I2 ∴ The loop equations in matrix form are