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433.

An I/O peripheral device shown in figure (b) below is to be interfaced to an 8085 microprocessor. To select the I/O device in the I/O address range D4 H – D7 H, its chip-select (CS) should be connected to the output of the decoder shown in figure (a) below:

[2 marks]
(A) output 7
(B) output 5
(C) output 2
(D) output 0

asked in Electronics and Communication Engineering, 2006

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434.

A new Binary Coded Pentary (BCP) number system is proposed in which every digit of a base-5 number is represented by its corresponding 3-bit binary code. For example, the base-5 number 24 will be represented by its BCP code 010100. In this numbering system, the BCP code 100010011001 corresponds to the following number in base-5 system
[2 marks]
(A) 423
(B) 1324
(C) 2201
(D) 4231

asked in Electronics and Communication Engineering, 2006

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435.

For the circuit shown below, assume that the zener diode is ideal with a breakdown voltage of 6 Volts. The waveform observed across R is

[2 marks]

asked in Electronics and Communication Engineering, 2006

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436.

For the circuit shown in the following figure, the capacitor C is initially uncharged. At t = 0, the switch S is closed. The voltage Vc across the capacitor at t = 1millisecond is:

In the figure shown above, the OP AMP is supplied with ±15V and the ground has been shown by the symbol ∇. [2 marks]
(A) 0 Volts
(B) 6.3 Volts
(C) 9.45 Volts
(D) 10 Volts

asked in Electronics and Communication Engineering, 2006

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437.

A heavily doped n − type semiconductor has the following data:
Hole-electron mobility ratio : 0.4
Doping concentration : 4.2 ×10⁸ atoms/m³
Intrinsic concentration : 1.5 ×10⁴ atoms/m³
The ratio of conductance of the n − type semiconductor to that of the intrinsic semiconductor of same material and at the same temperature is given by [2 marks]
(A) 0.00005
(B) 2,000
(C) 10,000
(D) 20,000

asked in Electronics and Communication Engineering, 2006

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438.

Find the correct match between Group 1 and Group 2:

Group 1 Group 2

(E) Varactor diode (1) Voltage reference

(F) PIN diode (2) High frequency switch

(G) Zener diode (3) Tuned circuits

(H) Schottky diode (4) Current controlled attenuator

[2 marks]
(A) E - 4, F - 2, G - 1, H - 3
(B) E - 2, F - 4, G - 1, H - 3
(C) E - 3, F - 4, G - 1, H - 2
(D) E - 1, F - 3, G - 2, H - 4

asked in Electronics and Communication Engineering, 2006

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