Deck 6: Series-Parallel Circuits

Question 1

A voltmeter, when connected across a component, can be viewed as being a resistor in series with that component.

Answer 1

False

Question 2

Thevinizing a circuit creates an equivalent series circuit.

Answer 2

True

Question 3

No problems could occur if a 10 V source and a 20 V source were connected in parallel.

Answer 3

False

Question 4

In Figure 6 -1, R2 is connected in .

A)series with R1
B)parallel with R3
C)parallel with R1
D)series with R3

Question 5

R1 is in series with the series combination R2 and R3 in Figure 6 -1.

Question 6

A loaded voltage divider is a series -parallel circuit.

Question 7

The superposition theorem applies only to electronic or electrical circuits with two or more sources.

Question 8

In Figure 6 -1, R1 is connected in .

A)series with R3
B)series with R2
C)parallel with R3
D)parallel with R2
E)none of the above

Question 9

A series -parallel circuit consists of resistors in both series and parallel.

Question 10

R1 is in series with the parallel combination R2 and R3 in Figure 6 -1.

Question 11

Two or more resistors connected in series form a circuit known as a voltage divider.

Question 12

R1 is in series with R3 in Figure 6 -1.

Question 13

If two resistors are in parallel, they carry the same current.

Question 14

A bridge circuit's resistances must all be of the same value to be in a balanced condition.

Question 15

Maximum power is achieved when the load resistance is approximately two times the source resistance.

Question 16

If two resistors are in parallel, they drop the same voltage.

Question 17

R2 is in parallel with R3 in Figure 6 -1.

Question 18

If R3 opens in Figure 6 -1, VR1 .

A)remains the same
B)decreases to zero
C)decreases
D)increases

Question 19

The voltage across any open in a series -parallel circuit will be the source voltage.

Question 20

If Vs = 20 V, R1 = 10 kΩ, R2 = 50 kΩ and R3 = 15 kΩ in Figure 6 -1, PR2 equals .

A)8.63 mW
B)18.6 mW
C)2.30 mW
D)7.64 mW

Question 21

If R1 = 10 kΩ, R2 = 15 kΩ and R3 = 50 kΩ in Figure 6 -1, RT equals .

A)11.5 kΩ
B)10 kΩ
C)9.5 kΩ
D)21.5 kΩ

Question 22

If every resistor in Figure 6 -2 equals 2.2 kΩ, what is the value of RT?

A)4.4 kΩ
B)5.5 kΩ
C)5.87 kΩ
D)2.2 kΩ

Question 23

If R4 shorts in Figure 6 -2, VR5 .

A)remains the same
B)decreases
C)decreases to zero
D)increases

Question 24

What is the resistance between points B and E in Figure 6 -3?

A)40 kΩ
B)10 kΩ
C)30 kΩ
D)20 kΩ

Question 25

If Vs = 15 V and every resistor equals 2.2 kΩ in Figure 6 -2, what is the value of IR4?

A)2.55 mA
B)5.11 mA
C)0.42 mA
D)0.85 mA

Question 26

If Vs = 12 V in Figure 6 -3, what is the value of VEB if R3 shorts?

A)8 V
B)-3 V
C)-8 V
D)6 V

Question 27

In Figure 6 -2, R3 and R4 are connected in .

A)parallel with each other
B)series with R2
C)series with each other and in parallel with R5
D)series with R5

Question 28

If all resistors equal 4.7 kΩ and Vs equals 20 V in Figure 6 -2, what is the value of IR3?

A)12.5 mA
B)1.06 mA
C)0.53 mA
D)11.99 mA

Question 29

If R1 shorts in Figure 6 -2, VR4 .

A)remains the same
B)equals VR2
C)decreases
D)increases

Question 30

If R2 opens in Figure 6 -2, VR3 .

A)decreases
B)causes the fuse to blow
C)remains the same
D)increases

Question 31

In Figure 6 -2, R3 and R4 are connected in .

A)parallel with R1 and R2
B)series with each other and R5
C)series with each other
D)series with each other and R1 and R2

Question 32

If R1 = 50 kΩ, R2 = 10 kΩ, R3 = 10 kΩ, R4 = 50 kΩ and R5 = 10 kΩ in Figure 6 -2, what is the value of RT?

A)85.7 kΩ
B)8.57 kΩ
C)68.6 kΩ
D)130 kΩ

Question 33

In Figure 6 -2 if R1 = 10 kΩ, R2 = 4.7 kΩ, R3 = 4.7 kΩ, R4 = 10 kΩ and R5 = 4.7 kΩ, RT = ?

A)6.1 kΩ
B)24.7 kΩ
C)18.3 kΩ
D)0 Ω

Question 34

If R3 shorts in Figure 6 -2, VR5 . Figure 6 -2

A)decreases
B)remains the same
C)increases

Question 35

If Vs = 22 V in Figure 6 -3, what is the is the value of VDB?

A)-22 V
B)-11 V
C)11 V
D)5.5 V

Question 36

If VR4 = 10 V in Figure 6 -3, what is the value of VAD?

A)30 V
B)10 V
C)40 V
D)20 V

Question 37

If R1 = 4.7 kΩ, R2 = 3.3 kΩ, R3 = 1 kΩ and Vs = 50 V in Figure 6 -1, IT equals .

A)12.1 mA
B)75.7 mA
C)9.15 mA
D)8.8 mA

Question 38

If Vs = 25 V, R1 = 10 kΩ, R2 = 15 kΩ and R3 = 50 kΩ in Figure 6 -1, IT equals .

A)1.58 mA
B)1.16 mA
C)2.5 mA
D)2.17 mA

Question 39

If all of the resistors in Figure 6 -2 are 4.7 kΩ, what is the value of RT?

A)4.7 kΩ
B)9.4 kΩ
C)12.5 kΩ
D)18.8 kΩ

Question 40

If R1 = 4.7 kΩ, R2 = 3.3 kΩ and R3 = 1 kΩ in Figure , the total resistance equals .

A)5700 Ω
B)660 Ω
C)5467 Ω
D)4125 Ω

Question 41

If the current is 1.2 mA in Figure 6 -3, what is the value of PT?

A)57.6 mW
B)5.76 mW
C)576 mW
D)0.576 mW

Question 42

The parallel combination of a 330 Ω resistor and a 470 Ω resistor is connected in series with the parallel combination of four 1 kΩ resistors. If a 100 V source is connected across the circuit, then which resistor carries the most current?

A)1 kΩ
B)470 Ω
C)330 Ω

Question 43

If a voltage divider consists of two 10 kΩ resistors, which one of these load resistors will change the output voltage the most?

A)10 kΩ
B)1 MΩ
C)20 kΩ
D)100 kΩ

Question 44

What is the resistance between points A and D in Figure 6 -3?

A)20 kΩ
B)10 kΩ
C)30 kΩ
D)40 kΩ

Question 45

In a two -source circuit, one source alone produces 10 mA through a branch. If the other source alone produces 8 mA in the opposite direction through the same branch, what is the total current through the branch?

A)18 mA
B)2 mA
C)10 mA
D)8 mA

Question 46

In solving series -parallel circuits, the last and easiest to solve for is:

A)RT.
B)PT.
C)ET.
D)IT.

Question 47

Power in a series -parallel resistor circuit is dissipated as:

A)heat.
B)resistance change.
C)current flow.
D)voltage loss.

Question 48

If four parallel 10 kΩ resistors are connected in series with a single 20 kΩ resistor and one of the parallel resistors opens, how does the voltage across the other parallel resistors change?

A)It remains the same.
B)It decreases.
C)It increases.

Question 49

The parallel combination of a 330 Ω resistor and a 470 Ω resistor is connected in series with the parallel combination of four 1 kΩ resistors. If a 100 V source is connected across the circuit, then which resistor drops the most voltage?

A)330 Ω
B)470 Ω
C)1 kΩ

Question 50

If a fifth 10 kΩ resistor is connected in series in Figure 6 -3, how does VR4 change?

A)VR4 remains the same.
B)VR4 increases.
C)VR4 decreases.
D)VR4 increases to 10 V.

Question 51

If VR3 = 17 V in Figure 6 -3, what is the value of P1?

A)17 mW
B)2.89 W
C)28.9 mW
D)1.7 mW

Question 52

In solving series -parallel circuits using Ohm's law, first solve for:

A)ET.
B)RT.
C)IT.
D)any of these, it doesn't matter.

Question 53

If four parallel 10 kΩ resistors are in series with a single 20 kΩ resistor and one of the parallel resistors shorts, the voltage across the other parallel resistors .

A)decreases
B)increases
C)remains the same

Question 54

If a 10 kΩ resistor is placed in parallel with R4 in Figure 6 -3, how will VR4 change?

A)VR4 will decrease.
B)VR4 will change to 4 volts.
C)VR4 will increase.
D)VR4 will remain the same.

Question 55

If VR1 = 15 V in Figure 6 -3, what is the value of VBD?

A)-60 V
B)30 V
C)-30 V
D)60 V

Question 56

If Vs = 40 V and R3 opens in Figure 6 -3, what is the value of VR3?

A)40 V
B)20 V
C)0 V
D)30 V
E)10 V

Question 57

If Vs = 50 V in Figure 6 -3, what is the value of VCA?

A)-25 V
B)5 V
C)25 V
D)-5 V

Question 58

In solving series -parallel circuits using Ohm's law, first solve for:

A)the parallel current.
B)the series resistance.
C)the series current.
D)the parallel resistance.

Question 59

Two series 1 kΩ resistors are connected in parallel with a 2.2 kΩ resistor. If the voltage across one of the 1 kΩ resistors is 6 V, what is the voltage across the 2.2 kΩ resistor?

A)3 V
B)13.2 V
C)12 V
D)6 V

Question 60

If the current is 12 mA in Figure 6 -3, what is the value of VEB?

A)-360 V
B)240 V
C)360 V
D)-240 V

Question 61

One Ohm's law formula PT = P1 + P2 + etc. can be used to solve for total power in:

A)series -parallel circuits.
B)parallel circuits.
C)series circuits.
D)all of these.

Question 62

Thevenin's theorem provides a method for:

A)designing complex series -parallel circuits.
B)simplifying complex series -parallel circuits.
C)building complex series -parallel circuits.
D)all of these.

Question 63

What approximate R1 resistor value would it take to balance this bridge circuit?

A)680 Ω
B)560 Ω
C)330 Ω
D)825 Ω

Question 64

According to the maximum power transfer theorem, maximum power is delivered to any load when the load resistance is:

A)less than one -half of the source resistance.
B)exactly equal to the source resistance.
C)larger than source resistance.
D)at least twice or more than the source resistance.

Question 65

Determine the amount of current flow through R2 with the following component parameters. VS1 = 10 V, VS2 = 3 V, R1 = 2 k, R2 = 3 k, and R3 = 700

A)1.37mA
B)0 A
C)5.3 mA
D)1 mA

Question 66

In the series portion of series -parallel circuits, the total resistance is:

A)equal to the largest resistance.
B)less than any one resistance.
C)greater than the largest resistance.
D)less than the largest resistance.

Question 67

The difference between a balanced and an unbalanced Wheatstone bridge is measured by:

A)a galvanometer.
B)an ohmmeter.
C)an ammeter.
D)a voltmeter.

Question 68

The super position theorem provides a method for:

A)analyzing complex series -parallel circuits.
B)designing complex series -parallel circuits.
C)building complex series -parallel circuits.
D)all of these.

Question 69

In the parallel portion of series -parallel circuits, the total resistance is:

A)less than the smallest resistance.
B)less than any one resistance.
C)equal to the smallest resistance.
D)greater than the largest resistance.

Question 70

With circuit balanced there is:

A)Cannot be determined without detailed analysis.
B)no current through the load.
C)no current flow through the total circuit.
D)maximum current flow through the load.

Question 71

If R1 is changed to 500 Ω, the Thevenin resistance and voltage would be:

A)595 and 807 mV.
B)595 and 3 V.
C)1 k and 807 mV.
D)1 k and 3 V.

Question 72

If all of the resistors of this circuit are 5 kΩ and VS1 and VS2 are 10 V but opposing polarities, what would be the current flow through R2?

A)1.33 mA
B)13.33 mA
C)0 A
D)2.66 mA

Question 73

The Wheatstone bridge circuit is widely used to measure:

A)precise resistances.
B)accurate currents.
C)exact voltages.
D)all of these.