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697.

A two port network, shown in Fig. is described by the following equations
I₁ = Y₁₁ E₁ + Y₁₂E₂
I₁ = Y₂₁ E₁ + Y₂₂E₂

The admittance parameters Y₁₁, Y₁₂, Y₂₂ for the network shown are
[2 marks]
(a) 0.5 mho, 1 mho, 2 mho and 1 mho respectively
(a) 1/3 mho, -1/6 mho, -1/6 mho and 1/3 mho respectively
(a) 0.5 mho, 0.5 mho, 1.5 mho and 2 mho respectively
(a) -2/5 mho, -3/7 mho, 3/7 mho and 2/5 mho respectively

asked in Electrical Engineering, 2002

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698.

A step down chopper is operated in the continuous conduction mode in steady state with a constant duty ratio D. If V₀ is the magnitude of the dc output voltage and if V_s is the magnitude of the dc input voltage, the ratio V_o/V_s is given by [1 mark]
(a) D
(b) 1-D
(c) 1/(1-D)
(d) D/(1-D)

asked in Electrical Engineering, 2002

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699.

What is the rms value of the voltage waveform shown in Fig?

[1 mark]
(a) 200/π V
(b) 100/π V
(a) 200 V
(a) 100 V

asked in Electrical Engineering, 2002

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700.

A six pulse thyristor rectifier bridge is connected to a balanced 50 Hz three phase ac source. Assuming that the dc output current of the rectifier is constant, the lowest frequency harmonic component in the ac source line current is [1 mark]
(a) 100 Hz
(b) 150 Hz
(c) 250 Hz
(d) 300 Hz

asked in Electrical Engineering, 2002

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701.

The state transition matrix for the system X = AX with initial state X(0) is
[1 mark]
(a) (sI - A)^-1
(b) e^At X(0)
(c) Laplace inverse of [(sI - A)^-1]
(d) Laplace inverse of [(sI - A)^-1X(0)]

asked in Electrical Engineering, 2002

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702.

The determinant of the matrix is : [1 mark]
(a) 100
(b) 200
(c) 1
(d) 300

asked in Electrical Engineering, 2002

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792 1 ...‹‹115 116117 118 119 ›› ... 132

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