26201 Alternating Current Quiz

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

• 1:2

• 2:1

• 2:2

• 3:4

Opening the secondary circuit of a current transformer under load will cause a dangerous level of _____.

• induced high voltage

• induced high current

• high impedance

• low impedance

What is the frequency of an AC waveform that completes 20 cycles per half second?

• 10Hz

• 20Hz

• 30Hz

• 40Hz

Tags

NGSS.HS-PS4-1

Each of three equal capacitors in series has _____.

• one-third the applied voltage

• the original value of the applied voltage

• twice the applied voltage

• three times the applied voltage

The formula for inductive reactance is _____.

• XL = 1 ÷ 2πfL

• XL = 2 ÷ πfL

• XL = 2π ÷ fL

• XL = 2πfL

What is the current flow in a purely resistive AC circuit if the resistance is 15 ohms and the voltage is 150V?

• 10A

• 14A

• 18A

• 22A

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

• decreases

• increases

• stays the same

• may increase or decrease

Tags

NGSS.HS-PS2-4

The self-induced voltage across an inductance is produced by a change in _____.

• current with respect to time

• resistance with respect to time

• capacitance with respect to time

• voltage with respect to time

Tags

NGSS.HS-PS2-5

A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The total capacitance is _____.

• 15

• 30

• 45

• 100

One type of nonsinusoidal waveform is the _____.

• square wave

• sine wave

• phase angle wave

• peak wave