Electrical Engineering Answers

A 25-kVA, 2500/250-V distribution transformer is connected as a stepup autotransformer, with the load connected to both the primary and secondary windings and the input connected to the secondary windings only. For this combination, draw the circuit diagram and determine:

a) the primary winding voltage,

b) the secondary winding voltage,

c) the voltage transformation ratio,

d) the nominal rating of the autotransformer.

  A working substance undergoes a reversible non flow process during which P = (-3V + 100) psia, where V changes from 10 ft³/min to 30 ft³/min. The change of internal energy for the process is – 100 BTU/min. For a non-flow process, determine a) work (BTU/min) b) heat transferred (BTU/min). 

2.) An asset costing P50,000 has a life expectancy of 6 years and an estimated salvage value of

P8,000. Calculate the depreciation charge at the end of the fourth period using fixed-percentage

method.

Answer;

P5,263.87

1.) An equipment costing P250,000 has an estimated life of 15 years with a book value of P30,000 at

the end of the period. Compute the depreciation charge and its book value after 10 years using the

sum of years digit method.

Answer;

d = P11,000

BV = P57,500

what is the volume of the solid generated when the region bounded by the curve y^3=x^3 and the x-axis, is revolved about the x-axis. (use cylindrical shell method)

Explain tha working principle and construction of bridge rectifier and also design the circuit.

Explain the working principle, functions and applications of digital and analog multimeters.

Three resistors of 10, 12, and “x” ohms, are connected in parallel across a constant current source of 8A. determine “x” if this resistor draws 2.5 Amp.

1. Do the experimental and theoretical values of voltages and currents agree?

2. Give possible reasons for any discrepancies.

3. Are KVL and KCL verified?

4. Give reasons for any discrepancies.

Solve the following equations:

1. z^2=1+p^2+q^2
2. 3p^2- 2q^2=4pq
3. p(1+q)=qz
4. (p/2+x)^2+(q/2+y)^2
5. pz=1+q^2
6. p^3+q^3=8z