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1.

In the single phase diode bridge rectifier shown in figure, the load resistor is R = 50Ω. The source voltage is v=200 sin(ωt), where ω=2π×50 radians per second. The power dissipated in the load resistor R is

[2 marks]
(a) 3200/π W
(b) 400/π W
(c) 400 W
(d) 800 W

last reply by CpjJwWHV • 13 years ago • asked in Electrical Engineering, 2002

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2.

In the circuit shown in Fig, the switch is closed at time t = 0. The steady state value of the voltage v_c is

[2 marks]
(a) 0 V
(b) 10 V
(c) 5 V
(d) 2.5 V

asked in Electrical Engineering, 2002

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3.

Fig. (a) shows an inverter circuit with a dc source voltage V_s. The semiconductor switches of the inverter are operated in such a manner that the pole voltages v₁₀ and v₂₀ are as shown in Fig (b). What is the rms value of the pole-to-pole voltage v₁₂?

[2 marks]
(a) V_sφ/π√2
(b) V_s √φ/π
(c) V_s √φ/2π
(d) V_s/π

asked in Electrical Engineering, 2002

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4.

In the chopper circuit shown in Fig. the input dc voltage has a constant value V_s. the output voltage V_o is assumed ripple-free. The switch S is operated with a switching time period T and a duty ratio D. what is the value of D at the boundary of continuous and discontinuous conduction of the inductor current i_L?

[2 marks]
(a) D = 1 - V_o/V_s
(b) D = 2L/RT
(c) D = 1- 2L/RT
(d) D = RT/L

asked in Electrical Engineering, 2002

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5.

The eigen values of the system represented by are :
[2 marks]
(a) 0, 0, 0, 0
(b) 1, 1, 1, 1
(c) 0, 0, 0, -1
(d) 1, 0, 0, 0

asked in Electrical Engineering, 2002

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6.

For the system , with u as unit impulse and with zero initial state, the output, y, becomes [2 marks]
(a) 2e^2t
(a) 4e^2t
(a) 2e^4t
(a) 4e^4t

asked in Electrical Engineering, 2002

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