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Q1

This document contains 3 questions about electrical engineering concepts: Q1 asks about transformers and how they increase/decrease voltage levels, calculating primary and secondary currents, and determining a reflected load. Q2 asks about inductor characteristics and construction, calculating true and reactive power for an ideal inductor, capacitor charging and discharging diagrams, and why capacitor reactance decreases with frequency. Q3 asks about the relationship between generator speed and frequency, calculating synchronous motor speed based on line frequency and poles, drawing sine waves from a phasor diagram, and calculating peak current in a circuit with a given half-cycle average voltage and resistance.

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Abdirahman Elmi Gure
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51 views2 pages

Q1

This document contains 3 questions about electrical engineering concepts: Q1 asks about transformers and how they increase/decrease voltage levels, calculating primary and secondary currents, and determining a reflected load. Q2 asks about inductor characteristics and construction, calculating true and reactive power for an ideal inductor, capacitor charging and discharging diagrams, and why capacitor reactance decreases with frequency. Q3 asks about the relationship between generator speed and frequency, calculating synchronous motor speed based on line frequency and poles, drawing sine waves from a phasor diagram, and calculating peak current in a circuit with a given half-cycle average voltage and resistance.

Uploaded by

Abdirahman Elmi Gure
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Q1

a) With the help of diagram describe how transformer increases and decreases level of the
voltage
b) Refer to the circuit in Figure 1. Discuss what component values do we need if we treat
the secondary side as the Load and can replace the Load impedances with components
that will achieve Maximum Power Transfer?
c) Find the Primary ( I p) and Secondary ( I s) currents for the circuit shown Figure 1.
d) When a 1.0kΩ load resistor is connected across the secondary winding of transformer
with a turn ratio of 2, what is the source sees a reflected load of

Q2

a) Discuss the basic construction and characteristics of the inductors


b) An ideal 50mH inductor is connected to a 12 V rms source. What is the true power? What
is the reactive power at frequency of 1 KHz?
c) With the help of diagram describe the charging and discharging of the a capacitor
d) Explain why the reactance provided by a capacitor to an alternating current decreases
with increasing frequency

Q3

a) How are the speed of rotation and the frequency in an AC generator related?
b) Considering a 60 Hz power source, at what RPM speed does a four-pole synchronous
motor run?
c) Draw the sine waves represented by the pharos diagram in Figure 2.
d) A sinusoidal voltage with a half-cycle average of 12.5V is applied to a circuit with a
resistance of 330Ω. What is the peak current in the circuit?
Figure 1

Figure 2

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