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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
In a sine wave the slope is constant

Between 90° and 180°
No where
Between 180° and 270°
Between 0° and 90°

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AC Fundamentals, Circuit and Circuit Theory
In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters?

220 V
220/v3 V
220 v3 V
None of these

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AC Fundamentals, Circuit and Circuit Theory
Wire-wound resistors are unsuitable for use at high frequencies because they

Exhibit unwanted inductive and capacitive effects
Are likely to melt under excessive eddy current heat
Consume more power
Create more electrical noise

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of pure cosine function is

Zero
0.707 of peak value
0.5 of peak value
Same as peak value

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AC Fundamentals, Circuit and Circuit Theory
The transient currents are associated with the

Changes in the stored energy in the inductors and capacitors
Resistance of the circuit
Impedance of the circuit
Applied voltage to the circuit

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AC Fundamentals, Circuit and Circuit Theory
The period of a sine wave is ___________ seconds. Its frequency is

40 Hz
50 Hz
30 Hz
20 Hz

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