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703.

Let Y(s) be the Laplace transformation of the function y(t), then the final value of the function is [1 mark]
(a) Lim_s→o Y(s)
(a) Lim_s→∞ Y(s)
(a) Lim_s→o sY(s)
(a) Lim_s→∞ sY(s)

asked in Electrical Engineering, 2002

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704.

Let s(t) be the step response of a linear system with zero initial conditions; then the response of this system to an input u(t) is [1 mark]

asked in Electrical Engineering, 2002

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705.

Consider the problem of relay co-ordination for the distance relays R1 and R2 on adjacent lines of a transmission system (Fig). The Zone 1 and Zone 2 settings for both the relays are indicated on the diagram. Which of the following indicates the correct time setting for the Zone 2 of relays R1 and R2. [1 mark]

(a) TZ2_R1 = 0.6s,TZ2_R2 = 0.3s
(b) TZ2_R1 = 0.3s,TZ2_R2 = 0.6s
(c) TZ2_R1 = 0.3s,TZ2_R2 = 0.3s
(d) TZ2_R1 = 0.1s,TZ2_R2 = 0.3s

asked in Electrical Engineering, 2002

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706.

A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at [1 mark]
(a) the upper surface of the conductor
(b) the lower surface of the conductor
(c) the ground surface
(d) midway between the conductor and ground

asked in Electrical Engineering, 2002

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707.

Consider a power system with three identical generators. The transmission losses are negligible. One generator (G1) has a speed governor which maintains its speed constant at the rated value, while the other generators (G2 and G3) have governors with a droop of 5%. If the load of the system is increased, then in steady state.
[1 mark]
(a) generation of G2 and G3 is increased equally while generation of G1 is unchanged.
(b) generation of G1 alone is increased while generation of G2 and G3 is unchanged.
(c) generation of G1, G2 and G3 is increased equally.
(d) generation of G1, G2 and G3 is increased in the ratio 0.5:0.25:0.25.

asked in Electrical Engineering, 2002

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708.

Consider a long, two-wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and the distance between their centers is 1m. If this distance is doubled, then the inductance per unit length
[1 mark]
(a) doubles
(b) halves
(c) increases but does not double
(d) decreases but does not halve

asked in Electrical Engineering, 2002

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