Q1

Q1. Discuss in detail isolation amplifier in detail with diagram?
Solution: –
Isolation amplifier as the name suggest is a form of differential amplifier that provides electrical isolation and an electrical safety barrier for measuring signals with small frequency in the existence of a high common mode voltage.
They “re essentially instrumental in practical shielding purposes as they protect data acquisition components from common mode voltages ,which are potential differences between the instrument and signal grounds.In case where common mode voltage interacts with instruments without isolation amplifier ,usually a noisy representation of the signal under investigation is the final product , this is because of no restrictions on the circulation of ground currents .in case of adequate level of mode voltage for the purpose ,instrument destruction is also a likely income.
Isolation amplifier also find implementation in medicine equipment (e.g life support) to ensure isolation of a patient from the leakage current via power supply.
These are also used in shielding the amplifier and instrument as a collective unit without salvaging accuracy of measurement as it allows the front end of the amplifier to float with respect to common mode voltage ,approaching the isolation barrier ‘s breakdown voltage lying in the excess of 1000 volts at times.
These amplifiers are also used for amplifying various low level signals in varied multiple channel applications .Measurement errors due to ground loops can also be evaded .Moreover ,amplifiers with internal transformers eliminate external isolated power supply, hence effectively changing the electric regularities to the user and instrument ‘s favour. They are usually used as analogue interface between
Systems with separate grounds.
Isolation amplifiers cam also include isolated power supplies for both input output stages ,or external power supplies on each isolated portions for the above usage.

Q2. Why do we need a saw tooth voltage to display a waveform on a CRO . Explain how Lissajous patterns are used in a CRO to measure an unknown frequency.
Solution:-
The time base generator which is responsible for producing the sweep and that will be amplified by the horizontal amplifier and then carried to the deflection plates of a CRO.
Sawtooth voltage play an important role to deflect the beam along X- axis and to refresh the CRO screen after every cycle giving stable image. Without sweep voltage the image displayed in screen will be a straight line.
CRO plays an important role in analysing the wave form of different signals. The main part of the CRO is CRT consist of
(vertical deflection plate, horizontal deflection plate ,electron beam).
When two different sine waves simultaneously applied to horizontal and vertical plates the pattern which is obtained in CRO screen is called Lissajous pattern. If the shape of Lissajous pattern has slight change then it also reflects into the phase difference and also in the ratio of frequencies of two sine waves .
Q.3 A DMM has 4 ½ digit display .What is the maximum number it can read ? What is the resolution ?
Solution:
If the DMM has 4 ½ digit display then it means that there will be five segments , one half digit and 4 half digits. The maximum number it can read would be 19999.
If we want to display 10 KV on a 4 ½ digital display we will use the leading half digit and in this case we will have five digit of resolution.

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Q1

Q1. One skill that I learned through curiosity was the concept of time. I first began to learn time in first class. My teacher used a very clever technique to stimulate my curiosity. The teacher made the lesson engaging by using open-ended activities. Each student in the classroom had a jigsaw clock. The teacher gradually went from introducing ‘o clock’ to ‘half past’. I began to become curious about the other the numbers on the clock. After a few weeks the teacher would ask questions like ‘what time do you get up at’. All the class would then show these times on the clock. My curiosity became stronger the closer I got to accomplishing the concept of time.

Q2. One skill I learned through scaffolding was learning how to swim. Scaffolding refers to the support needed to assist a student in achieving their learning goals. The first step in learning how to swim was getting used to shallow waters using tools such as armbands and goggles. The first few sessions involved blowing bubbles in the water and towing each other using floats. The instructor would often provide challenges such as who could swim the furthest without the float. The sessions to follow included swimming in small groups with the instructor giving instructions from the edge. This involved moving from playing what I thought were silly games to learning various arm and leg techniques. The instructor would then offer corrective feedback. I think scaffolding focuses on the idea that new is build on top of the known.

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Q3. A)
Organisation: To me organisation is key in my ability to pay attention. I try to keep my environment for work or study organised and neat so that disorganisation doesn’t distract me or slow me down. If my work area is untidy I find it hard to pay attention.
Duration: The duration of the lesson will affect how long an individual can pay attention for. The average adult has an attention span of fifteen minutes. I often find it difficult to stay focused for longer than twenty minutes.
B)
Enactment: I think actually carrying out a task is vital to remembering the steps involved. Take for example a non-school related activity such as using the wash machine. By watching someone use it and then trying to do it yourself you will remember how to do it.
Primacy and recency effect: I find it easier to remember things from the start and end of a class as my attention is greatest at these times.

Q4. As a trainee teacher I would prioritise organisation. Being organised means you are in control and this is really important in the classroom when working with young children. Disorganisation leads to time being wasted- time that should be used for learning. If the teacher is rushing around the classroom trying to get organised in the middle of a lesson children will lose interest and may even become frustrated leading to less learning. I would like to finish on a quote by Benjamin Frankin that I think sums up the importance of organisation- ‘For every minute spend organising an hour is earned’.

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