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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The phosphors for which of the following pair are 180° out of phase for VL, VC and VR?

VC and VL
VL and VR
VC and VR
None of these

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AC Fundamentals, Circuit and Circuit Theory
The form factor is the ratio of

r.m.s. value to average value
None of these
Average value to r.m.s. value
Peak value to r.m.s. value

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AC Fundamentals, Circuit and Circuit Theory
Skin effect occurs when a conductor carries current at _________ frequencies.

Low
Medium
High
Very low

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

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

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AC Fundamentals, Circuit and Circuit Theory
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to

None of the listed here
R.m.s. voltage
Peak voltage
Average voltage

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

20 Hz
40 Hz
30 Hz
50 Hz

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