Alternating Current

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The average value of an AC sine wave is ____ Times the peak value ?

.637

In an inductive AC circuit when the applied voltage is at its maximum negative value is ?

0

In a circuit that has a capacitance and resistance the current will lead the voltage by some angle between ____ and ____ degree ?

0 and 90

Three equal capacitors in series has _____ of the applied voltage ?

1/3V

The time for one cycle is 0.1 second, the frequency is ?

10

The current in an AC circuit with resistance only is ? The circuit has a resistance of 15 ohms and a voltage of 150 volts?

10 I = e/r

A circuit has a RMS voltage of 120vac, the peak voltage is?

170 Rms=.707 x peak

A circuit has a peak voltage of 275 volts, the average voltage is ?

175 Average = .637 x peak

The step down turns ratio of a transformer with 200 Turns in the primary and 100 turns in the secondary is ?

2:1

The hertz rating of an AC circuit is ? If the frequency is 20 cycles per 1/2 seconds ?

40 F= c/t

The true power in a 2 amp series RL circuit with a 100 ohm resistor is ?

400

What is the total capacitance of a 30 microfarad capacitor in parallel with a 15 microfarad capacitor ?

45

What is the secondary voltage of a transformers that has 200 turns in the primary with 150vac and a secondary of 100 turns ?

50

If the vector diagram of two AC waveforms is a right angle than the waves are _____ out of ?

90

The maximum voltage is generated by a rotating wire when the conductor is moving across a magnetic field at ______ deg ?

90

Power factor is the ratio of true power to _____ power ?

Apparent

The opposition to the current flow in a capacitive circuit is know as ?

Capacitive reactance

If the phase angles of two sine waves are both 00 then the waves are ?

Cosine of the phase angles

The self induced voltage across an inductance is equal to the change in ______ with the respect to time ?

Current

Capacitive reactance ______ when the frequency increase ?

Decrease

If the frequency remains the same the capacitive reactance will increase with an _____ in capacitance ?

Decrease

The phase relationship that exist between the voltage and the current in an inductive circuit can be remembered by ?

ELI THE ICE MAN

Capacitance is measured in ?

Faradas

According to the power triangle the apparent power is _____ greater than the true power ?

Greater

Inductance is measured in ?

Henry's

The total opposition to the current flow in AC circuit is ?

Impedance

Inductive reactance increases with an ____ in frequency ?

Increase

To increase the capacitance of a capacitor _____ the area of the plates ?

Increase

Opening the secondary of a CT under load will cause a dangerous level of ?

Induce high voltage

The ______ of a circuit always opposes any change in the current of the circuit ?

Inductance

The current in an inductive circuit ______ the voltage ?

Lags

The current in a capacitive circuit ____ the voltage ?

Leads

An electric current always a ?

Magnetic field

All DC rules and laws including ohm's law apply in AC circuits containing only ?

Pure resistance

The product of the source voltage across the branches is the _____ as the applied voltage ?

Same

Electrical energy is transferred from one circuit to another using electrical magnetic induction by a ?

Transformers

Transformers on which the primary and secondary voltage are 180 degrees out of phase are know as ______ wound transformers ?

Unlike

The formula for inductive reactance is ?

Xl = 2pieFL


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