NCCER 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?
ANS 2;1
2. Opening the secondary circuit of a current transformer under load
will cause a dangerous level of
ANS induced high voltage
3. What is the frequency of an AC waveform that completes 20 cycles per
half second?
ANS 40Hz
1/2
, 4. A circuit has a peak voltage of 275V. What is the average voltage value?
ANS -
175V
5. Each of three equal capacitors in series has
ANS one-third the applied voltage
6. The formula for inductive reactance is
ANS XL = 2fÀL
7. What is the current flow in a purely resistive AC circuit if the resistance
is 15 ohms and the voltage is 150V?
ANS 10A
8. If the area of the plates of a capacitor is increased, the amount of
capaci- tance
ANS increases
2/2
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?
ANS 2;1
2. Opening the secondary circuit of a current transformer under load
will cause a dangerous level of
ANS induced high voltage
3. What is the frequency of an AC waveform that completes 20 cycles per
half second?
ANS 40Hz
1/2
, 4. A circuit has a peak voltage of 275V. What is the average voltage value?
ANS -
175V
5. Each of three equal capacitors in series has
ANS one-third the applied voltage
6. The formula for inductive reactance is
ANS XL = 2fÀL
7. What is the current flow in a purely resistive AC circuit if the resistance
is 15 ohms and the voltage is 150V?
ANS 10A
8. If the area of the plates of a capacitor is increased, the amount of
capaci- tance
ANS increases
2/2
