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421.

In Fig, if the input is a sinusoidal signal, the output will appear as shown in

[2 marks]

asked in Electrical Engineering, 2005

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422.

The typical frequency response of a two-stage direct coupled voltage amplifier is as shown in [2 marks]

asked in Electrical Engineering, 2005

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423.

Consider the inverting amplifier, using an ideal operational amplifier shown in Fig.The designer wishes to realize the input resistance seen by the small signal source to be as large as possible, while keeping the voltage gain between –10 and –25. the upper limit on R_F is 1 MW. The value of R₁ should be

[2 marks]
(a) Infinity
(b) 1 MΩ
(c) 100 kΩ
(d) 40 kΩ

asked in Electrical Engineering, 2005

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424.

The common emitter amplifier shown in Fig. is biased using a 1 mA ideal current source. The approximate base current value is:

[2 marks]
(a) 0 µA
(b) 10 µA
(c) 100 µA
(d) 1000 µA

asked in Electrical Engineering, 2005

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425.

Two wattmeters, which are connected to measure the total power on a threephase system supplying a balanced load, read 10.5 kW and –2.5 kW, respectively. The total power and the power factor, respectively, are
[2 marks]
(a) 13.0 kW, 0.334
(b) 13.0 kW, 0.684
(c) 8.0 kW, 0.52
(d) 8.0 kW, 0.334

asked in Electrical Engineering, 2005

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426.

A 1000 V DC supply has two 1-core cables as its positive and negative leads; their insulation resistances to earth are 4 MΩ and 6 MΩ, respectively, as shown in Fig. A voltmeter with resistance 50 KΩ is used to measure the insulation of the cable. When connected between the positive core and earth, the voltmeter reads

[2 marks]
(a) 8 V
(b) 16 V
(c) 24 V
(d) 40 V

asked in Electrical Engineering, 2005

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