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Electrical level 2 module 1 alternating current Exam Q’s and A’s
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Electrical level 2 module 1 alternating current Exam Q’s and A’s
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Electrical level 2 module 1 alternatingcurrent Exam Q’s and A’s
What is the step-down turns ratio of a transformer with 200 turns in the
primary and 100 turns in the secondary? - -2:1
-Opening the secondary circuit of a current transformer under load will
cause a dangerous level of - -induced high voltage
-What is the frequency of an AC waveform that completes 20 cycles per half
second? - -40Hz
-A circuit has a peak voltage of 275V. What is the average voltage value? - -
175V
-Each of three equal capacitors in series has - -one-third the applied voltage
-The formula for inductive reactance is - -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
-If the area of the plates of a capacitor is increased, the amount of
capacitance - -increases
-The self-induced voltage across an inductance is produced by a change in -
-current with respect to time
-A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The
total capacitance is - -45
-One type of nonsinusoidal waveform is the - -square wave
-According to the power triangle, the apparent power is - -greater than the
true power
-A device that uses electromagnetic induction to transfer electrical energy
from one circuit to another is a(n) - -transformer
-If a transformer has 200 turns in the primary, 100 turns in the secondary,
and 150VAC applied to the primary, the voltage across the secondary is - -
75VAC
-Transformers in which the primary and secondary voltages are 180 degrees
out of phase are known as - -unlike-wound transformers
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