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769.

AC-to-DC circulating current dual converters are operated with the following relationship between their triggering angles (α₁ and α₂). [1 mark]
(a) α₁ + α₂ = 180°
(b) α₁ + α₂ = 360°
(c) α₁ - α₂ = 180°
(d) α₁ + α₂ = 90°

asked in Electrical Engineering, 2001

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770.

The main reason for connecting a pulse transformer at the output stage of a thyristor triggering circuit is to [1 mark]
(a) amplifying the power of the triggering pulse
(b) provide electrical isolation
(c) reduce the turn on time of the thyristor
(d) avoid spurious triggering of the thyristor due to noise

asked in Electrical Engineering, 2001

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771.

An op-amp has an open-loop gain of 10⁵ and an open-loop upper cutoff frequency of 10 Hz. If this op-amp is connected as an amplifier with a closed-loop gain of 100, then the new upper cutoff frequency is
[1 mark]
(a) 10 Hz
(b) 100 Hz
(c) 10 kHz
(d) 100 kHz

asked in Electrical Engineering, 2001

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772.

The output of of the 4-to-1 MUX shown in Fig. is

[1 mark]
(a) xy + x
(b) x+y
(c) x + y
(d) xy + x

asked in Electrical Engineering, 2001

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773.

The output of a logic gate is “1” when all its inputs are at logic “0”. The gate is either [1 mark]
(a) a NAND or an EX-OR gate
(b) a NOR or an EX-OR gate
(c) an AND or an EX-NOR gate
(d) a NOR or an EX-NOR gate

asked in Electrical Engineering, 2001

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774.

Among the following four, the slowest ADC (analog-to-digital converter) is
[1 mark]
(a) parallel comparator (i.e., flash) type
(b) successive approximation type
(c) integrating type
(d) counting type

asked in Electrical Engineering, 2001

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