NEIEP 600 FINAL EXAM QUESTIONS WITH DETAILED
CORRECT ANSWERS GRADED A+
1. In capacitors, what is the purpose of the dielectric?
Answer: Prevent arcing within the capacitor
2. Which of the following is true about capacitors in AC circuits?
Answer: Current leads voltage all the time
3. What describes a capacitor s ability to store an electrical charge?
Answer: Capacitance
4. which of the following statements is correct about polarized electrolytic ca- pacitors?
Answer: Voltage polarity must be correct
5. What is the time constant for a circuit with 150k ohms and 2 microfarad
capacitor?
Answer: .3 seconds
6. If frequency is increased in a capacitave circuit what will happen?
, Answer: Capacitive reactance will decrease
7. What happens in a circuit, when the capacitor voltage equals the source voltage?
Answer: Current flow stops in the circuit
8. In a DC circuit, which is correct about capacitors the instant when power is applied?
Answer: Current is maximum
9. In the circuit shown in figure 1, what will be the total capacitance?
Answer: 250 u(micro) farads
10. If a circuit has a capacitor of 5 microfrauds and a source voltage of 120 volts DC
through a resistance of 200k, how long will it take to fully charge?
Answer: 5 seconds
11. which statement best describes one time constant of a capacitor?
Answer: The time it takes to charge to 63.2% of applied voltage
12. If two capacitors in parrallel have equal reactance of 40 ohms what is the total
reactance?
Answer: 20ohms
13. Which of the following would increase the DC working voltage DCWV of a capacitor
Answer: Increase the plate area and the dielectric thickness
14. Which statement is correct concerning capacitors?
CORRECT ANSWERS GRADED A+
1. In capacitors, what is the purpose of the dielectric?
Answer: Prevent arcing within the capacitor
2. Which of the following is true about capacitors in AC circuits?
Answer: Current leads voltage all the time
3. What describes a capacitor s ability to store an electrical charge?
Answer: Capacitance
4. which of the following statements is correct about polarized electrolytic ca- pacitors?
Answer: Voltage polarity must be correct
5. What is the time constant for a circuit with 150k ohms and 2 microfarad
capacitor?
Answer: .3 seconds
6. If frequency is increased in a capacitave circuit what will happen?
, Answer: Capacitive reactance will decrease
7. What happens in a circuit, when the capacitor voltage equals the source voltage?
Answer: Current flow stops in the circuit
8. In a DC circuit, which is correct about capacitors the instant when power is applied?
Answer: Current is maximum
9. In the circuit shown in figure 1, what will be the total capacitance?
Answer: 250 u(micro) farads
10. If a circuit has a capacitor of 5 microfrauds and a source voltage of 120 volts DC
through a resistance of 200k, how long will it take to fully charge?
Answer: 5 seconds
11. which statement best describes one time constant of a capacitor?
Answer: The time it takes to charge to 63.2% of applied voltage
12. If two capacitors in parrallel have equal reactance of 40 ohms what is the total
reactance?
Answer: 20ohms
13. Which of the following would increase the DC working voltage DCWV of a capacitor
Answer: Increase the plate area and the dielectric thickness
14. Which statement is correct concerning capacitors?
