Questions
Activity- ELECTRICAL SAFETY ACCIDENT As a Manager you have responsibility for a large kitchen. This contains...

Activity- ELECTRICAL SAFETY ACCIDENT
As a Manager you have responsibility for a large kitchen.
This contains a water softener unit through which water has to pass before being delivered to a dishwasher. The water softener unit had been causing problems recently so you agree with the kitchen manager to call in the maintenance contractor to look at the equipment. The equipment, which consists of a tall cylinder is located underneath a sink draining tray in the corner of the kitchen.
After carrying out some remedial work the contractor decides to test out the functioning of the equipment. The equipment is fitted with a time clock which means that the operating cycle can be set by kitchen staff. To check that the unit is coming on and off according to the timed settings the contractor removes a cover from the unit.
The cover is posted with an electrical hazard warning sign. Removal of the cover gave the contractor access to a cam, the rotation of which operates, or switches off, the equipment according to the time settings. This is a quick way of working through the time cycle.
The electrical hazard warning sign relates to the hazard arising from two electrical terminals which depending on the position of the cam are either electrically live i.e. when equipment is switched on, or dead i.e. when equipment is switched off. During this simulation of the unit’s operating cycle the contractor was sat on the tiled floor underneath the sink draining board with his legs extending beyond the sink into the kitchen.
While doing this a member of the kitchen staff went into this area and saw the contractor was ‘shaking’. At first she was slightly embarrassed as she thought the contractor was ‘having a fit’ and did not immediately mention it to her supervisor. When she did, they went to see the contractor and, getting no response from him, switched the equipment off at the mains before removing him from underneath the sink. An ambulance was then called and the contractor taken to hospital where he was detained overnight, then discharged. The contractor had sustained an electric shock rather than a ‘fit’.
As Manager of this area, using the facts provided and any reasonable assumptions you wish to make,
* outline the (causative) factors leading to this accident with reference to failures
in safe plant & equipment; competent staff; safety culture; and safe systems
of work / safe procedures
* identify
* what are the responsibilities of your organisation for the contractor
* what health and safety information should have been obtained from the contractor
* what, if any, action should be taken against the contractor
* recommendations on what should be done to avoid a recurrence
* also identify possible breaches of statutory legislation and comment on how significant / serious these are
*should be between 500-750 words and must include your name, registration number, word count and set out the brief. Where appropriate, referencing should be provided.

In: Electrical Engineering

Elaborate theory behind the use of ballistic galvanometers; including diagrams and mathematical derivations

Elaborate theory behind the use of ballistic galvanometers; including diagrams and mathematical derivations

In: Electrical Engineering

The full load speed of a three-phase four-pole 50Hz, 160kW induction motor is 1,475rpm. The starting...

The full load speed of a three-phase four-pole 50Hz, 160kW induction motor is 1,475rpm.
The starting torque is 170%, the yield torque is 280% of the rated torque,
and the moment of inertia of the rotor is 2.5kg-m ^ 2.
The torque of the load converted to the motor shaft is 800 N-m at full load speed
and the moment of inertia is 20 kg-m ^ 2.

a) Find the starting time when the load torque is assumed to be constant.
b) Find the start time assuming load torque is proportional to speed.
c) Find the starting time assuming load torque is proportional to the square of the speed.
d) Find the starting time when the load torque is assumed to be pure inertia with zero.

answer -
a) 2.7sec
b) 2.0sec
c) 1.9sec
d) 1.7sec

In: Electrical Engineering

Design a 3 bit binary GRAY DOWN counter using T-FF

Design a 3 bit binary GRAY DOWN counter using T-FF

In: Electrical Engineering

****MATLAB QUESTION**** As an enthusiastic and motivated student you decide to go out and buy plenty...

****MATLAB QUESTION**** As an enthusiastic and motivated student you decide to go out and buy plenty of pens for all your classes this semester. This spending spree, unfortunately, occurred before you realized your engineering classes seldom require the use of "ink". So now, you're left with four different types of pens and no receipt-you only remember the total amount you spent and not the price of each type of pen. You decide to get together with three of your friends who coincidentally did the same thing as you, buying the same four types of pens and knowing only the total amount.

Write a script to find the prices of each type of pen..

In: Electrical Engineering

A cooper wire of 100m has the resistance of 1 Ohms. Determine the diameter of the...

A cooper wire of 100m has the resistance of 1 Ohms. Determine the diameter of the wire.

In: Electrical Engineering

A 460 V 25 Hp, 60 Hz, 4-pole, Y-connected induction motor has the following parameters in...

A 460 V 25 Hp, 60 Hz, 4-pole, Y-connected induction motor has the following parameters in ohms per phase referred to the stator circuit.

R1= 0.641 W R2= 0.332 W   X1= 1.106 W X2=0.464 W Xm=26.3 W

The rotational losses are 1100 W and are assumed to be constant. The core loss is included in this figure. The motor is supplied at rated voltage and rated frequency. Calculate;

  1. Synchronous speed
  2. Slip at which maximum torque occurs
  3. The maximum torque of the motor
  4. Assuming that the torque curve is linear between Tmax and synchronous speed, what is the motor mechanical torque at STmax/2?

The supply frequency is reduced to 30 Hz.

  1. What should be the supply voltage to keep the pole flux constant at 60 Hz value?
  2. Repeat the solution for 30 Hz
  3. Compare results of 30 Hz and 60 Hz operation.

In: Electrical Engineering

Explain the principle of operation of an ultrasonic sensor for use in an industrial automation application....

Explain the principle of operation of an ultrasonic sensor for use in an industrial automation application. Answer should include details on the type of target that can be detected, effect on sensing distance of different target types, typical sensing distance and what the term ‘blind zone’ refers to in relation to these sensors.

In: Electrical Engineering

Please use your own words, starting from the electrical characteristics of both capacitor and inductor, to...

Please use your own words, starting from the electrical characteristics of both capacitor and inductor, to explain how capacitor and inductor store energy and attain memory.

In: Electrical Engineering

Sketch the asymptotes of the Bode plot magnitude and phase for the transfer functions: 1. T(s)...

Sketch the asymptotes of the Bode plot magnitude and phase for the transfer functions:

1. T(s) = 1/((s+1)^2+(s+10)^2)

2. T(s) = (s+5)(s+10)/((s)(s+1)(s+100))

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Please give brief descriptions and examples with diagrams on RSSI POWER BANDS SENSITIVITY

Please give brief descriptions and examples with diagrams on
RSSI POWER BANDS
SENSITIVITY

In: Electrical Engineering

2. In a balanced Y-Y four-wire connection system, the source is an abc sequence of voltage...

2. In a balanced Y-Y four-wire connection system, the source is an abc sequence of voltage and ??? = 100∠0 0 . The load impedance per phase is 4 + ?7 Ω , and the line impedance per phase is 2+?1 Ω. Solve for the Line Current and Neutral Current.

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Please give brief descriptions and examples with diagrams on CHANNEL POWER POWER DENSITY IQ DIGITAL ANALOG...

Please give brief descriptions and examples with diagrams on
CHANNEL POWER
POWER DENSITY
IQ DIGITAL ANALOG MODULATION

In: Electrical Engineering

Capacitors and Inductors Identify some of the different types of capacitors, and their characteristics. Identify some...

Capacitors and Inductors

Identify some of the different types of capacitors, and their characteristics. Identify some of the different type of inductors, and their characteristics. It would be appropriate to include small pictures.

In: Electrical Engineering

In your own words, describe what an operational amplifier is and what its major applications are....

In your own words, describe what an operational amplifier is and what its major applications are. Then describe what an ideal model for op amp is and what some of the main assumptions made for an op amp to be modeled with an ideal model.

In: Electrical Engineering