Description
this unit covers ascertaing correct operation of single and three phase a.c circuits and solving cirrcuit problem
Unformatted Attachment Preview
Written Assessment Task 1
TAFE
Student Name:
Q 1. The expressions for voltages in an AC circuit are given as V1 = 50sin (wt + 30°), V2 =
200sin (wt - 150°), V3 = 100sin (wt + 60°) and V4 = 150sin (wt - 45°). Calculate:
V1 + V2 + V3 – V4. Give your answer in a) Polar form b) In Time Domain.
the voltage
NE
Student Name:
/6)
(
Q 2. In a certain series AC circuit the voltage is v = 500sin (1000t) V and current is i =
25sin (1000t - 30º) A. Determine:
1. RMS voltage
2. RMS current
3. Frequency in Hz
4. Circuit Impedance in 1
5. Circuit resistance
6. Circuit inductance or capacitance
their eye
Page 4
Written Assessment Task 1
TAFE
Student Name:
( 712)
Q 4. A voltage given by v = 50sin (500t) V is applied to a parallel R-L-C circuit. If R = 100
2, L = 100 mH and C = 10 uF. Calculate:
1. Total Admittance
2. Total Current
3. Individual branch currents
4. Sketch the Admittance triangle
5. Sketch a Phasor diagram showing all currents and voltages
Page 7 of 1
Last Updated: 26 March 2018
SN
Student Name:
( 78)
Q3. The expression for a voltage is given by v = 240sin (377t) V. Determine:
1. Frequency in Hz
2. Period of the waveform
3. Peak voltage
4. Peak-to-peak voltage
5. Instantaneous voltage at t = 10 ms
6. Time required for voltage to reach -50 V in the first cycle.
Page 5 of 11
Last Updated: 26 March 2018
Written Assessment Task v1
NUEOS9/2 - Applied Electricity (a.c.)
Learning Resources Manual
January 2006
10
NUE059/2 - Applied Electricity (a.c.)
Learning Resources Manual
January 2006
Written Assessment Task 1
TAFE
MSN
Student Name:
= 10 KVA
Q 5. The following loads are connected in parallel to a 200 Vrms supply: Load 1
at 0.8 pf lag, Load 2 = 4.KW, Load 3 = 11 KVAR lead. Determine the total load and
power factor presented to the supply and sketch the Power Triangle.
END
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The company was not aware of the problem until it was notified by security expert Brian Krebs, an outside source.A real estate developer outside of FAF first noticed this concern when they found that anyone who knew the URL for a valid document could then access any other document simply by changing a number in the URL. The company’s website, firstam.com, was leaking hundreds of millions of private documents not intended to be viewed by just any user. This means that any individual who had previously been emailed a link from FAF could possibly gain access to a plethora of sensitive and private documents. No authentication was required in order to access these documents, nor were they protected in any other way. This left a lot of personal and private information exposed for those with malicious intent to use in nefarious ways, for example, identity theft.When FAF was notified of the breach, it shut down its website and immediately conducted an internal review. 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