LEVEL 2 MODULE 1 ALTERNATING CURRENTS EXAM

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LEVEL 2 MODULE 1 ALTERNATING CURRENTS EXAM

QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -35 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: 0.637 x peak value

Answer:

In sine wave terminology, the average value is___.

Question 2: Are in phase

Answer:

If the phase angles of two sine waves are both 0 degrees then the waves___.

Question 3: Apparent power

Answer:

The power factor can be defined as the ratio of true power to___.

Question 4: Unlike-wound transformers

Answer:

Transformers in which the primary and secondary voltages are 180 out of phase are known as___.

Question 5: All DC rules and laws apply, including Ohm's law

Answer:

In AC circuits containing only resistance,___.

Question 6: 10 Hz

Answer:

If the time for one cycle is 0.1 second, the frequency is___.

Question 7: 340V

Answer:

Given: A circuit has an rms voltage of 120VAC. What is the peak-to-peak voltage?

Question 8: XL=2piefL

Answer:

The formula for inductive reactance is___.Question 9: 2:1

Answer:

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

Question 10: 400W

Answer:

Calculate the true power in a 2A series RL circuit with a 100 ohms resistor.

Question 11: 45

Answer:

Given: A 30-microfarad capacitor in parallel with a 15-microfarad capacitor. The total capacitance is___.

Question 12: It leads the voltage.

Answer:

Which of the following is true of the current in a capacitive circuit?

Question 13: The same as the applied voltage

Answer:

In a parallel LC circuit, the voltage across the branches is___.

Question 14: Rms values

Answer:

Unless otherwise noted, the calculations in AC circuits use___.

Question 15: Are 90° out of phase

Answer:

If the vector diagram of two AC waveforms is a right angle, then the waves___.

Question 16: one-third the applied voltage

Answer:

Each of three equal capacitors in series has___.

Question 17: 40Hz

Answer:

What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second?

Question 18: Inductance

Answer:

Which of the following opposes any change in circuit current?

Question 19: Lags the voltage

Answer:

The current in inductive circuit___.

Question 20: Increases

Answer:

If the area of the plates of a capacitor is increased, the amount of capacitance___.

Question 21: induced high voltage

Answer:

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

Question 22: 175V

Answer:

A circuit has a peak voltage of 275V. What is the average voltage value?

Question 23: Zero

Answer:

In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is___.

Question 24: Current with respect to time

Answer:

The self-induced voltage across in inductance is equal to the change in___.

Question 25: Frequency increases

Answer:

Inductive reactance increases as the___.

Question 26: Across the field at 90°

Answer:

Maximum voltage is generated by rotating wire when the conductor is moving___.

Question 27: Apparent power

Answer:

The product of the source voltage and the total current is___.

Question 28: 75V AC

Answer:

Given: A transformer has 200 turns in the primary, 100 turns in the secondary, and 150V AC applied to the primary. What is the voltage across the secondary?

Question 29: 10A

Answer:

Given: An AC circuit containing resistance only. What is the current flow if the resistance is 15 ohms and the voltage is 150v?