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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

42.42 sin 314 t
30 sin 50 t
60 sin 25 t
84.84 sin 25 t

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AC Fundamentals, Circuit and Circuit Theory
The main cause of silting up a channel,

Non-regime section
Defective head regulator
Inadequate slope
All of these

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

High
Medium
Very low
Low

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AC Fundamentals, Circuit and Circuit Theory
In a purely inductive circuit

Apparent power is zero
Actual power is zero
None of the listed here
Reactive power is zero

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AC Fundamentals, Circuit and Circuit Theory
Power factor of the following circuit will be unity

Inductance
Resistance
None of the listed here
Capacitance

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AC Fundamentals, Circuit and Circuit Theory
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

A sinusoid of double the frequency
A sinusoid of half the original frequency
None of the listed here
A sinusoid of the same frequency

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