Electrical Engineering Answers

A single phase 100 VA, 120/24 V transformer has the following results from the open-circuit and short-circuit tests.

Open circuit. Short Circuit

Voltage 120V 6V

Current. 0.1A 4.9A

Power 4.5W 16W

(a) Determine the circuit parameters (Rc, Xm, Req, Xeq) referred to the Higho Voltage side.

(b) Determine the efficiency of the transformer at full load with 0.8 power factora lagging.

Find the volume of the solid generated by revolving about the x-axis bounded by the curve, y2 = 9x and the line y = 3x

(a) Find fx(x,y), fy(x,y), fx(1,3), and fy(-2,4) for the given function. If 

𝑧 = 𝑓(𝑥, 𝑦) = 3𝑥

ଷ𝑦

ଶ − 𝑥

ଶ𝑦

ଷ + 4𝑥 + 9

(b) A firm estimates that it can sell Q units of its product with an advertising 

expenditure of x thousand dollars where 

𝑄 = 𝑄(𝑥) = −𝑥

ଶ + 600𝑥 + 25

i) Over what level of advertising expenditure is the number of units of 

product sold increasing? 

ii) Over what level of advertising expenditure is the number of units of 

product sold decreasing?

During loading operations an untrained employee has driven the company forklift truck over the end of the loading bay. The untrained employee did not ask permission to drive the forklift; no manager was available at the time; the keys were in the forklift and he thought he was competent enough to complete the loading of the truck himself. He thinks the forklift may have skidded on something on the loading bay floor.

The employee has suffered a broken leg, the forklift is a write-off, and the HSE Inspector who was on site within an hour of the accident, said they are likely to prosecute the company under HASAW 1974, section 2, breach of duty to employees and lack of training.

From the information given calculate the approximate cost of the accident to the employer. Consider all aspects of the accident: include items such as fines, court costs, equipment replacement costs, loss of production and possible compensation claims.

Explain how control measures in general are used for to prevent accidents. You may use specific examples from your workplace and link to the management of risk.

Using your own workplace or another engineering environment you are familiar with, investigate the procedures for reporting accidents and incidents. Obtain and enclose accident and incident report forms with your report.

Fully describe the procedure for reporting accidents, dangerous occurrences and near-misses in this workplace.

It is important to report and record accidents and incidents. Explain the underlying principles involved. Explain WHY we report? What we report? HOW we report? And WHYrecords are kept? You should make reference to: legal requirements, competent persons, costs, trends and the management of Health and Safety in an engineering workplace. 

Using an appropriate source, research industrial accident statistics, and describe how the trend in the engineering sector has changed in recent years. You must include a copy of the researched data with your answer. Consider any problems with statistical trends with accident data.

write python code multiply the two input values and then print the result of the multiplication.

Write a python programme that defines a function and calls it to print “---------------------" lines followed by the text “Congratulations” + concatenated with the name of any person taken as parameter passed to the function + text “you passed the examination!”.