Electrical Engineering Answers

A capacitor consists of two similar square aluminium plates, each 10 cm × 10 cm mounted parallel and opposite to each other. What is their capacitance in μ F when distance between them is 1 cm and the dielectric is air

Modern programmable controller systems use a wide range of networks which are control by standards and protocols. One of these modern programmable controllers is the Siemens S7 1200 which uses the Profinet network. 

Describe the network and explains the relevant standards and protocols used.

a) You are required to examine the three main types of communication media (ie twisted pair, coaxial and fibre optic cables) and explain using diagrams the advantages and disadvantages for each type.

b) Select one of the cable from the list and explain how the cable selected can be used for a PLC application.

c) Explain using diagrams, the construction of three types of connectors which are used in PLC communications and select a suitable PLC application for each. 

d) Opto – isolator are used in some PLC devices for communication purposes. Explain using diagrams how the Opto-isolator works and states at least three advantages for using Opto – isolators in PLC applications.

PLCs are very useful devices that are used for a wide variety of applications such as controlling the operation of the automatic roller door to the entrance of KPL Foods warehouse in assignment 1. The equipment poses a number of health and safety issues which must be taken into consideration to prevent harm.

a) Describe some of the health and safety issues which should be considered.

b) Identify at least 4 relevant Health and Safety legislations which should be observed when working with programmable controlled equipment.

as there is no option of attachment here... question is in the given link below:

https://www.chegg.com/homework-help/questions-and-answers/50v-40-v3-50-vdc-100-nf-vg-pin2-mpxa6115a-mpxh6115a-ve-pin-adc-35-temp-0-85-c-30-typ-gnd-p-q74101999

Design a FIR Hilbert transformer. Arbitrarily choose the window function and number of samples. Plot the magnitude response.

Design a FIR digital differentiator. Arbitrarily choose the window function and number of samples. Plot the magnitude response.

What are the near field and far field of an antenna? What are their major differences?

Calculate the value of α, β, γ ,η for a rubber at a frequency f=10⁶ Hz. It is given that ε_r = 3.5, σ=10^-16 mhos/m & µ_r=1.

A 4 pole dc series motor has an armature resistance of 0.1 Ω. Its field winding is divided into two groups, each having resistance of 0.01 Ω. When the two groups are in a series and supply voltage as 110 V the current drawn by the motor is 50 A, running at 700 r.p.m. Find the speed if field groups are connected in parallel. Assume load torque constant and flux proportional to the field current.