NCCER 201: ALTERNATING CURRENT
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
A 20-microfarad capacitor is in parallel with a 10-microfarad capacitor. The total capacitance is _____.
10 microfarads
20 microfarads
30 microfarads
40 microfarads - ANSWER 30 Microfarads
Each of two equal capacitors in series has_____.
half the applied voltage
the original value of the applied voltage
twice the applied voltage
four times the applied voltage - ANSWER Half the applied voltage
The self-induced voltage across an inductance is produced by a change in current with respect to ____.
frequency
time
capacitance
input voltage - ANSWER Time
Transformer windings are typically wrapped around a(n) _____.
polyester core
insulated paper core
iron core
copper core - ANSWER Iron Core
What is the apparent power of an AC circuit with a source voltage of 240V and a total current of 15A?
, 1,200W
2,400W
3,600W
7,200W - ANSWER 3,600W
What is the step-down turns ratio of a transformer with 150 turns in the primary and 50 turns in the
secondary?
1:3
3:1
10:1
10:3 - ANSWER 3:1
The opposing force that an inductor presents to the flow of alternating current is called _____.
inductive resistance
inductive reactance
true resistance
inductive capacitance - ANSWER Inductive Reactance
The product of the source voltage and the total current is_____.
true power
apparent power
reactive power
the power factor - ANSWER Apparent Power
The power factor can be defined as the ratio of true power to _____.
reactive power
total resistance
total current
apparent power - ANSWER Apparent Power
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
A 20-microfarad capacitor is in parallel with a 10-microfarad capacitor. The total capacitance is _____.
10 microfarads
20 microfarads
30 microfarads
40 microfarads - ANSWER 30 Microfarads
Each of two equal capacitors in series has_____.
half the applied voltage
the original value of the applied voltage
twice the applied voltage
four times the applied voltage - ANSWER Half the applied voltage
The self-induced voltage across an inductance is produced by a change in current with respect to ____.
frequency
time
capacitance
input voltage - ANSWER Time
Transformer windings are typically wrapped around a(n) _____.
polyester core
insulated paper core
iron core
copper core - ANSWER Iron Core
What is the apparent power of an AC circuit with a source voltage of 240V and a total current of 15A?
, 1,200W
2,400W
3,600W
7,200W - ANSWER 3,600W
What is the step-down turns ratio of a transformer with 150 turns in the primary and 50 turns in the
secondary?
1:3
3:1
10:1
10:3 - ANSWER 3:1
The opposing force that an inductor presents to the flow of alternating current is called _____.
inductive resistance
inductive reactance
true resistance
inductive capacitance - ANSWER Inductive Reactance
The product of the source voltage and the total current is_____.
true power
apparent power
reactive power
the power factor - ANSWER Apparent Power
The power factor can be defined as the ratio of true power to _____.
reactive power
total resistance
total current
apparent power - ANSWER Apparent Power
