Deck 7: Series-Parallel Circuits

Question 1

When a load resistor is connected across a voltage divider output, the output voltage increases.

Answer 1

False

Question 2

Series components in a series-parallel circuit may be in series with other components, or with other combinations of components.

Answer 2

True

Question 3

Given the circuit in Figure 7-4, calculate the current at Point A.

A) 0.67 A
B) 2 A
C) 0.8 A
D) 1.2 A

Answer 3

0.8 A

Question 4

Figure 7-1
Given the circuit in Figure 7-1, which resistors are in parallel?

A) R2 and R4
B) R1 and R3
C) R1 and R4
D) R2 and R3

Question 5

Given the circuit in Figure , calculate the total resistance.

A) 162 Ω
B) 242 Ω
C) 122 Ω
D) 152 Ω

Question 6

A series-parallel circuit is a:

A) combination of series paths
B) combination of series and parallel paths.
C) combination of parallel paths
D) None of the above are correct.

Question 7

When analyzing a series-parallel circuit, the circuit should be:

A) reduced down to find the total current first
B) reduced down to one series circuit.
C) reduced down to one parallel circuit
D) reduced down to find the total voltage first.

Question 8

Observed voltages not being shared identify components in parallel in a series-parallel circuit.

Question 9

Troubleshooting is the process of identifying and locating a fault in a circuit.

Question 10

A loaded voltage divider is a common application of a series-parallel circuit.

Question 11

Open circuits and short circuits are typical circuit faults.

Question 12

Parallel components in a series-parallel circuit may be in parallel with other individual components, or with other combinations of components.

Question 13

When analyzing series-parallel circuit currents, you should start with the current in the branch farthest from the source.

Question 14

Resistors normally short when they burn out.

Question 15

A series-parallel circuit is a combination of both series and parallel paths.

Question 16

Given the circuit in Figure , calculate the current through the 40 Ω resistor.

A) 2 A
B) 0.8 A
C) 0.67 A
D) 1.2 A

Question 17

Figure 7-2
Given the circuit in Figure 7-2, which resistors are in series?

A) R3, R4 and R5
B) R3 and R4
C) R1, R2 and R5
D) R1, R2 and R3

Question 18

When finding the total resistance of a series-parallel combination, the most important step is:

A) to know how to use Ohm's law
B) to know the value of the total current.
C) to know the value of the source voltage
D) to define the series and parallel relationships.

Question 19

Given the circuit in Figure , calculate the total resistance.

A) 34 kΩ
B) 3 kΩ
C) 7 kΩ
D) 12 kΩ

Question 20

Which of the following is needed to solve most resistive circuit analysis problems?

A) the current divider formula
B) Ohm's law
C) the voltage divider formula
D) all of the above

Question 21

A voltmeter with an ohms per volt rating of 200 Ω/V is connected as shown in Figure . It is set on the 150 volt range. What voltage will the meter indicate?

A) 30 V
B) 60 V
C) 105 V
D) 45 V

Question 22

Where can the voltage divider formula be useful in a series-parallel circuit?

A) with a group of series-parallel connected resistors
B) with a group of series connected resistors
C) with a group of parallel connected resistors
D) with series-opposing power supplies

Question 23

A Thevenin equivalent circuit contains _.

A) a current source in series with a resistance
B) resistors in a series-parallel configuration
C) a voltage source in series with a resistance
D) many voltage sources

Question 24

When R1 = 7 kΩ, R2 = 20 kΩ, R3 = 36 kΩ, and R4 = 45 kΩ. What is the total circuit resistance if R1 is in series with a parallel combination of R2, R3, and R4?

A) 108 kΩ
B) 41 kΩ
C) 4 kΩ
D) 17 kΩ

Question 25

When analyzing circuit current in a series-parallel circuit, you start:

A) anywhere in the circuit
B) in any parallel branch.
C) at the farthest resistor from the source
D) at the source with total current.

Question 26

An unloaded voltage divider consists of:

A) any parallel circuit
B) all series-parallel connections.
C) a single parallel circuit only
D) all series connections.

Question 27

Components or combinations of components with common currents, in a series-parallel circuit, are in:

A) series with each other
B) either series or parallel with each other.
C) parallel with each other
D) none of the above

Question 28

is often used to analyze multiple-source circuits.

A) Kirchhoff's Law
B) Ohm's Law
C) Thevenin's Theorem
D) Superposition

Question 29

Figure 7-9
Determine what is wrong in the circuit in Figure 7-9.

A) R3 open
B) R4 open
C) R1 shorted
D) R2 open
E) none of the above

Question 30

In a series-parallel circuit, individual component power dissipations are calculated using:

A) a percent of the voltage division ratio squared.
B) individual component parameters.
C) a percent of the total power depending on resistor ratios.
D) total current squared multiplied by the resistor values.

Question 31

Given the circuit in Figure , calculate the voltage drop across the 15 kΩ resistor.

A) 7.2 V
B) 6 V
C) 12 V
D) 2.4 V

Question 32

Given the circuit in Figure calculate the current through the 10 kΩ resistor.

A) 4.8 mA
B) 0.6 mA
C) 47.2 mA
D) 48 mA

Question 33

The loading effect of a voltmeter can be ignored if .

A) the measured voltage is very low
B) the meter's resistance is at least 10 times less than the resistance across which it is connected
C) the measured voltage is very high
D) the meter's resistance is at least 10 times greater than the resistance across which it is connected

Question 34

The first goal to accomplish in analyzing a complex series-parallel circuit is to:

A) equate all parallel components
B) solve for all the voltage drops.
C) solve for the total current and resistance
D) equate all series components.

Question 35

Figure 7-6
Given the circuit in Figure 7-6, calculate the output voltage.

A) 6.4 V
B) 10.7 V
C) 8.6 V
D) 10 V

Question 36

Voltage dividers are used to:

A) obtain two or more, lower, voltages from a common supply voltage.
B) change several voltages into other values.
C) change several voltages into one voltage.
D) convert several voltages into a common supply voltage.

Question 37

What is the voltage of R1 when the circuit with 24 V applied, has series resistors R₁ 1 kΩ) and R₂ 2 kΩ) which are in parallel with R₃ 3 kΩ)?

A) 12 V
B) 24 V
C) 16 V
D) 8 V

Question 38

A Wheatstone bridge can be used as a:

A) precision ammeter
B) sensitive voltmeter
C) precision ohmmeter
D) voltage divider

Question 39

Figure 7-8
Given the circuit in Figure 7-8, what current would flow if R2 were open?

A) 175 mA
B) 68 mA
C) 208 mA
D) 140 mA

Question 40

Figure 7-8
Given the circuit in Figure 7-8, what is the current through R3?

A) 0.35 A
B) 35 mA
C) 208 mA
D) 0.35 mA

Question 41

The total resistance of an R-2R ladder circuit equals:

A) R × 2R
B) R
C) R + 2R
D) 2R

Question 42

A strain gauge

A) is a transducer
B) can be used in Wheatstone bridge circuits.
C) can be extremely delicate
D) all of the above

Question 43

When a Wheatstone bridge is balanced, the of resistance on one side of the bridge is equal to the
Of resistance on the other side of the bridge.

A) average, product
B) ratio, ratio
C) product, sum
D) sum, difference

Question 44

The current that flows through an unloaded voltage divider is called the:

A) voltage current
B) load current
C) resistor current
D) bleeder current

Question 45

An R-2R ladder circuit is used for:

A) analog-to-digital conversion
B) analog-to-analog conversion
C) digital-to-analog conversion
D) digital-to-digital conversion

Question 46

When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read:

A) zero volts
B) twice the source voltage
C) half the source voltage
D) the same as source voltage