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301.

A digital system is required to amplify a binary-encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary is [1 mark]
(a) 8
(b) 6
(c) 5
(d) 7

asked in Electronics and Communication Engineering, 2004

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302.

The range of signed decimal numbers that can be represented by 6-bite 1’s complement number is [1 mark]
(a) -31 to +31
(b) -63 to +64
(c) -64 to +63
(d) -32 to +31

asked in Electronics and Communication Engineering, 2004

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303.

A master slave flip-flop has the characteristic that [1 mark]
(a) change in the input immediately reflected in the output
(b) change in the output occurs when the state of the master is affected
(c) change in the output occurs when the state of the slave is affected
(d) both the master and the slave states are affected at the same time

asked in Electronics and Communication Engineering, 2004

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304.

Assuming V_Cesat = 0.2V and β = 50, the minimum base current (I_B) required to drive the transistor in Fig. to saturation is [1 mark]

(a) 56 µA
(b) 140 mA
(c) 60 µA
(d) 3 mA

asked in Electronics and Communication Engineering, 2004

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305.

The circuit in Figure is a

[1 mark]
(a) low-pass filter
(b) high-pass filter
(c) band-pass filter
(d) band-reject filter

asked in Electronics and Communication Engineering, 2004

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306.

Voltage series feedback (also called series shunt feedback) results in
[1 mark]
(a) increase in both input and output impedances
(b) decrease in both input and output impedances
(c) increase in input impedance and decrease in output impedance
(d) decrease in input impedance and increase in output impedance

asked in Electronics and Communication Engineering, 2004

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