Neiep 600 Final Exam Review
Question : In capacitors, what is the purpose of the dielectric?
CORRECT ANSWER : Prevent arcing within the capacitor
Question : Which of the following is true about capacitors in
AC circuits?
CORRECT ANSWER : Current leads voltage all the time
Question : What describes a capacitor s ability to store an
electrical charge?
CORRECT ANSWER : Capacitance
Question : which of the following statements is correct about
polarized electrolytic capacitors?
CORRECT ANSWER : Voltage polarity must be correct
Question : What is the time constant for a circuit with 150k
ohms and 2 microfarad capacitor?
CORRECT ANSWER : .3 seconds
Question : If frequency is increased in a capacitave circuit
what will happen?
CORRECT ANSWER : Capacitive reactance will decrease
Question : What happens in a circuit, when the capacitor
voltage equals the source voltage?
CORRECT ANSWER : Current flow stops in the circuit
Question : In a DC circuit, which is correct about capacitors
the instant when power is applied?
CORRECT ANSWER : Current is maximum
Question : In the circuit shown in figure 1, what will be the
total capacitance?
CORRECT ANSWER : 250 u(micro) farads
Question : 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?
CORRECT ANSWER : 5 seconds
Question : What happens in a circuit, when the capacitor
voltage equals the source voltage?
CORRECT ANSWER : Current flow stops in the circuit
Question : which statement best describes one time constant
of a capacitor?
CORRECT ANSWER : The time it takes to charge to 63.2%
of applied voltage
Question : In a DC circuit, which is correct about capacitors
the instant when power is applied?
CORRECT ANSWER : Current is maximum
Question : 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?
CORRECT ANSWER : 5 seconds
Question : If two capacitors in parrallel have equal reactance
of 40 ohms what is the total reactance?
CORRECT ANSWER : 20ohms
Question : Which of the following would increase the DC
working voltage DCWV of a capacitor
CORRECT ANSWER : Increase the plate area and the
dielectric thickness
Question : Which statement is correct concerning capacitors?
CORRECT ANSWER : Increased plate area, increases
capacitance
Question : Which of the following is the unit used for
measuring capacitance?
CORRECT ANSWER : Farad
Question : Current flow from positive to negative is described
as
