Electrical Engineering Answers

a. A 20 V dc voltage is measured by analog and digital multi-meters. The analog instrument is on 

its 25 V range, and its specified accuracy is ± 2%. The digital meter has a 3½ digital display 

and an accuracy of ± (0.6+1). Determine measurement accuracy in each case.

b. A digital frequency meter has a time base from 1 MHz clock generator frequency divided by 

decade counters. Determine the measured frequency when a 1.512 kHz sine wave is applied 

and the time base uses (a) six decade counters and (b) four decade counters.

a. List the requirements of laboratory type signal generators. 

b. Write a note on sine-wave generator, square wave generator, pulse generator, function 

generator, and Lab VIEW.

c. Illustrate in detail IEEE488 Electrical Interface.

Find the following system are Linear or non-linear

1. Y(t)= X(t-2)+X(2-t)

2. Y(t)=t^2 X(t-1)

An FIR filter has an impulse response given by ℎ(𝑛)={2,1,2,1}. Find its response 𝑦(𝑛) to the input 𝑥(𝑛)={1,−2,4}. Assume that both 𝑥(𝑛) and ℎ(𝑛) start at 𝑛=0.

Find the auto-correlation of 𝑥(𝑛)={2 5 −4}.

↑

Find the cross-correlation of the sequences:

𝑥(𝑛)={3 5 1 2} and ℎ(𝑛)={1 4 3}

↑ ↑

Find the regular convolution of the following sequences using tabular method:

𝑥(𝑛)={3 −2 1 4} and ℎ(𝑛)={2 5 3}

↑ ↑

Find the convolution of the signals:

𝑥(𝑛)={2 𝑛=−2,0,1

3 𝑛=−1

0 elsewhere}

ℎ(𝑛)=𝛿(𝑛)−2𝛿(𝑛−1)+3𝛿(𝑛−2)−𝛿(𝑛−3)

(a) Graphical method

(b) Sliding strip method

Evaluate the step response of the LTI system represented by the following impulse response :

(a) ℎ(𝑛)=𝛿(𝑛)−𝛿(𝑛−2)

(b) ℎ(𝑛)=𝑛𝑢(𝑛)

Implement the following function using two op-amps and the required number of resistors

V_o = V₁ - 2V₂ + 3V₃ - 4V₄