Fall-2014 ENS203 Quiz No. 6
Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Figure 10.1
1) See Figure 10.1. What is the time constant t for this circuit?
A) 5 s
B) 5 ms
C) 50 ms
D) 500 ms
1)
2) See Figure 10.1. If the initial voltage of the capacitor = 0V, after the closing of the switch, when will
the voltage vC reach 5.0 V?
A) 0.5 s
B) 0.35 s
C) 1.5 s
D) It will never reach 5.0 V.
2)
3) See Figure 10.1. If the initial voltage of the capacitor = 0V, what is the maximum instantaneous
current that will flow through the capacitor after the closing of the switch?
A) 1 mA
B) 5 µA
C) 200 kA
D) infinity
3)
4) Which of the following is true of a capacitor once the charging phase in a dc network has passed?
A) The capacitor can be replaced by an open circuit.
B) Resistor values are no longer important.
C) Breakdown of the capacitor takes place.
D) The capacitor can be replaced by a short circuit.
4)
5) Which of the following describes the action of a capacitor?
A) Converts ac into dc
B) Opposes changes in the flow of current
C) Creates a dc resistance
D) Stores electrical energy
5)
1
Figure 11.2
6) See Figure 11.2. The current through a 10 mH coil is changing as shown in the diagram. What is the
voltage across the coil at t = 1 ms?
A) 2 mV
B) 10 mV
C) 50 mV
D) 0 V
6)
Figure 11.6
7) See Figure 11.6. What is the source current I after steady-state voltage and current conditions are
reached?
A) 0 mA
B) 2 mA
C) 0.9 mA
D) 4 mA
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Figure 11.7
8) See Figure 11.7 What is the time constant x for this circuit?
2
8)
7)
Answer Key
Testname: UNTITLED1
1)
2)
3)
4)
5)
6)
7)
8)
D
B
A
A
D
C
B
1.8 µs
3