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This mock test of Test: Signals for Electrical Engineering (EE) helps you for every Electrical Engineering (EE) entrance exam.
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QUESTION: 1

A cosine wave voltage signal has a 10V RMS value and 60Hz frequency. Also at time, t=0, the value of the voltage signal is equal to its RMS value. Which of the following is the correct mathematical representation of the voltage signal?

Solution:

Only equation 14.14 cos(120πt + π/4) satisfies all the given parameters.

QUESTION: 2

Which of the following is a characteristic of digital signal?

Solution:

Digital signal is non continuous and has discrete sets of possible value which it can take.

QUESTION: 3

Consider an N-bits ADC (Analog to Digital Converter) whose analog input varies from 0 to Vmax, then which of the following is not true?

Solution:

None of the statements are true.

QUESTION: 4

In compact disc (CD) audio technology, the signal is sampled at 44kHz. Each sample is represented by 16bits. What is the speed of the system in bits/second?

Solution:

44000 X 16 = 704000 bits/s

QUESTION: 5

An electrical signal can be represented in either Thevenin form or Norton From. However, Thevenin representation is preferred when

Solution:

a is preferred in Thevenin’s case and b in Norton’s case

QUESTION: 6

An electrical signal can be represented in either Thevenin form or Norton From. However, Norton representation is preferred when

Solution:

a is preferred in Thevenin’s case and b in Norton’s case

QUESTION: 7

Consider the DAC (digital to Analog Converter) shown below. Where b_{1}, b_{2}….b_{n} can be either 0 or 1. (Q.7 to Q.9)

**Q. What will be the value of the output current io, if the digital signal is in the form of b1b2b3…bn**

Solution:

It is the total current that will flow individual resistances.

QUESTION: 8

Which is the Most Significant Bit and Least Significant Bit in this case?

Solution:

LSB will have maximum resistance (hence least contribution to the total current) and MSB will have least resistance (Hence maximum contribution to the total current).

QUESTION: 9

For v_{ref} = 10V, n = 6, and R= 5000 ohm, which of the following is true?

Solution:

According to the figure, the LSB is given by 10 / 5000^{6} mA.

QUESTION: 10

What is the binary representation of 57?

Solution:

The binary equivalent of 57 is 111001

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