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667.

A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is
[1 mark]
(a) 86.7%
(b) 88.26%
(c) 88.9%
(d) 87.8%

asked in Electrical Engineering, 2003

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668.

Two infinite strips of width w m in x direction as shown in Fig, are carrying forward and return currents of +I and –I in the z direction. The strips are separated by a distance of x m. The inductance per unit length of the configuration is measured to be L H/m. If the distance of separation between the strips is now reduced to x/2 m, the inductance per unit length of the configuration is

[1 mark]
(a) 2L H/m
(b) L/4 H/m
(c) L/2 H/m
(d) 4L H/m

asked in Electrical Engineering, 2003

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669.

Two conductors are carrying forward and return current of +I and –I as shown in Fig. The magnetic field intensity H at point P is

[1 mark]
(a) I/πd y
(a) I/πd x
(a) I/2πd y
(a) I/2πd x

asked in Electrical Engineering, 2003

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670.

In the Fig. Z₁=10∠-60°, Z₂=10∠60°, Z₃ =50∠53.13°. The Venn impedance seen from X-Y is

[1 mark]
(a) 56.6∠45°
(b) 60∠30°
(c) 70∠30°
(d) 34.4∠65°

asked in Electrical Engineering, 2003

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671.

A segment of a circuit is shown in Fig. V_R = 5V, V_C = 4 sin 2t. The voltage V_L is given by

[1 mark]
(a) 3 – 8 cos 2t
(b) 32 sin 2t
(c) 16 sin 2t
(d) 16 cos 2t

asked in Electrical Engineering, 2003

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672.

Fig. shows the waveform of the current passing through an inductor of resistance 1Ω and inductance 2 H. The energy absorbed by the inductor in the first four seconds is

[1 mark]
(a) 144 J
(b) 98 J
(c) 132 J
(d) 168 J

asked in Electrical Engineering, 2003

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792 1 ...‹‹110 111112 113 114 ›› ... 132

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