Test: Electronic Devices & Digital Communications - 1

# Test: Electronic Devices & Digital Communications - 1 - Electronics and Communication Engineering (ECE)

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## 15 Questions MCQ Test - Test: Electronic Devices & Digital Communications - 1

Test: Electronic Devices & Digital Communications - 1 for Electronics and Communication Engineering (ECE) 2023 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Electronic Devices & Digital Communications - 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Electronic Devices & Digital Communications - 1 MCQs are made for Electronics and Communication Engineering (ECE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electronic Devices & Digital Communications - 1 below.
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Test: Electronic Devices & Digital Communications - 1 - Question 1

### Concentration of free electrons in a copper wire (diameter=1.03 mm) is 8.4 x 1028 electrons/m3. If the current in the wire is 2A, then drift velocity is

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Test: Electronic Devices & Digital Communications - 1 - Question 2

### If a donor-type impurity is added to the extent of 1 atom per 108 silicon atoms, find the resistivity.

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Test: Electronic Devices & Digital Communications - 1 - Question 3

### The p-type substrate in a monolithic circuit should be connected to

Test: Electronic Devices & Digital Communications - 1 - Question 4

What is the ratio of current for a forward bias of 0.05 V to the current for the same magnitude of reverse bias?

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Test: Electronic Devices & Digital Communications - 1 - Question 5

The probability of an electron being thermally promoted to the conduction band in Si(∈g=1.107 eV) at room temperature (25°C)?

Test: Electronic Devices & Digital Communications - 1 - Question 6

One curve of an n-channel MOSFET is characterized by the following parameters
ID(sat) = 0.2 mA
VDs = 0.8 V

VTN =0.8V

The value of conduction parameter is

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Test: Electronic Devices & Digital Communications - 1 - Question 7

Sampling rate needed to achieve (SNR)0/P ≥ 45 dB with fs = 10 MHz in a PCM system

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Test: Electronic Devices & Digital Communications - 1 - Question 8

In a 64 step binary PCM system with a reference scale from 0 to 6.4 volts, the RMS quantization error will be,

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Test: Electronic Devices & Digital Communications - 1 - Question 9

In a BPSK signal detector, the local oscillator has a fixed phase error of 25.2°. Reduction in SNR will be by a factor of _____________

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Test: Electronic Devices & Digital Communications - 1 - Question 10

The SQR (Signal to Quantization Noise Ratio) of a system is 25.8 dB for 16 quantization levels. The percentage increase in SQR for 128 quantization levels is

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Test: Electronic Devices & Digital Communications - 1 - Question 11

Error distance in 8 QAM modulation scheme is

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Test: Electronic Devices & Digital Communications - 1 - Question 12

A system with transfer function H(s) is driven by a white noise x(t) with power density N0. The Auto-correlation of the output signal is measured as    where α > 0. A possible transfer function H(s) for system wilt be

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Test: Electronic Devices & Digital Communications - 1 - Question 13

A vestigial SSB system is used to modulate a TV signal having bandwidth equal to 4 MHz. If roll-off factor is 1, the bandwidth required to transmit the signal is given by _________ MHz

Test: Electronic Devices & Digital Communications - 1 - Question 14

The capacitance of varactor varies from 5 to 50 pF. Two such varactor diodes are used in the tunning circuit shown in figure

If L= 10 mH, the tuning range of the circuit

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Test: Electronic Devices & Digital Communications - 1 - Question 15

The variation of drain current with gate to source voltage (lD - VGS characteristic) of a MOSFET is shown in figure. The MOSFET is

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