E5B Exponential charge/discharge curves
(time constants): definition;
time
constants in RL and RC circuits;
E5B01
(B)
What is
the term for the time required for the capacitor in an RC circuit to be charged
to 63.2% of the supply voltage?
A. An exponential rate of one
B. One time constant
C. One exponential period
D. A time factor of one
E5B02
(A)
What is
the term for the time required for the current in an RL circuit to build up to
63.2% of the maximum value?
A. One time constant
B. An exponential period of one
C. A time factor of one
D. One exponential rate
E5B03
(D)
What is
the term for the time it takes for a charged capacitor in an RC circuit to
discharge to 36.8% of its initial value of stored charge?
A. One discharge period
B. An exponential discharge rate of one
C. A discharge factor of one
D. One time constant
E5B04
(C)
The
capacitor in an RC circuit is charged to what percentage of the supply voltage
after two time constants?
A. 36.8%
B. 63.2%
C. 86.5%
D. 95%
E5B05 (D)
The
capacitor in an RC circuit is discharged to what percentage of the starting
voltage after two time constants?
A. 86.5%
B. 63.2%
C. 36.8%
D. 13.5%
E5B06
(A)
What is
the time constant of a circuit having two 100-microfarad capacitors and two 470-kilohm
resistors all in series?
A. 47 seconds
B. 101.1 seconds
C. 103 seconds
D. 220 seconds
E5B07
(D)
What is
the time constant of a circuit having two 220-microfarad capacitors and two
1-megohm resistors all in parallel?
A. 47 seconds
B. 101.1 seconds
C. 103 seconds
D. 220 seconds
E5B08
(C)
What is
the time constant of a circuit having a 220-microfarad capacitor in series with
a 470-kilohm resistor?
A. 47 seconds
B. 80 seconds
C. 103 seconds
D. 220 seconds
E5B09
(A)
How
long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in
a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
A. 0.02 seconds
B. 0.08 seconds
C. 450 seconds
D. 1350 seconds
E5B10
(B)
How
long does it take for an initial charge of 20 V DC to decrease to 0.37 V DC in
a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
A. 0.02 seconds
B. 0.08 seconds
C. 450 seconds
D. 1350 seconds
E5B11
(C)
How
long does it take for an initial charge of 800 V DC to decrease to 294 V DC in
a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
A. 0.02 seconds
B. 0.08 seconds
C. 450 seconds
D. 1350 seconds