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Electrical level 2 module 1 alternating current
1.What is the step-down turns ratio of a transformer with 200 turns in
the primary and 100 turns in the secondary?: 2:1
2.Opening the secondary circuit of a current transformer under load
will cause a dangerous level of: induced high voltage
3.What is the frequency of an AC waveform that completes 20 cycles per
half second?: 40Hz
4.A circuit has a peak voltage of 275V. What is the average voltage value?: -
175V
5.Each of three equal capacitors in series has: one-third the applied
voltage
6.The formula for inductive reactance is: XL = 2ÀfL
7.What is the current flow in a purely resistive AC circuit if the resistance
is 15 ohms and the voltage is 150V?: 10A
8.If the area of the plates of a capacitor is increased, the amount of
capaci- tance: increases
9.The self-induced voltage across an inductance is produced by a
change in: current with respect to time
