Question 1

When converting a wye configuration with all equal resistors to a delta configuration, the delta resistor will always be _ times its related wye resistor.

Accepted Answer

A)  6 
B)  5 
C)  4 
D)  3

Question 2

-Convert the Delta network in Figure  into a Wye network.

Accepted Answer

A)  R1 = 25.7 kΩ, R2 = 143.8 kΩ, R3 = 78.3 kΩ 
B)  R1 = 42.1 kΩ, R2 = 174.9 kΩ, R3 = 78.3 kΩ 
C)  R1 = 37.9 kΩ, R2 = 143.8 kΩ, R3 = 64.8 kΩ 
D)  R1 = 25.7 kΩ, R2 = 174.9 kΩ, R3 = 64.8 kΩ

Question 3

An ideal current source produces an) value of current through a load, regardless of the value of the load.

Accepted Answer

A)  proportional 
B)  decreasing 
C)  increasing 
D)  constant

Question 4

Which of these statements is true of two or more current sources in parallel?

Accepted Answer

A)  They violate Kirchhoff's current law. 
B)  A series resistor must be placed in each branch. 
C)  They may be replaced by one current source. 
D)  The magnitude of the combined current is always less than the smallest individual current.

Question 5

Figure 8-2
-Given the circuit in Figure 8-2, Calculate the total current through R2, using the superposition method.

Accepted Answer

A)  133 mA 
B)  67 mA 
C)  16 mA 
D)  83 mA

Question 6

-Given the circuit in Figure 8-1, find the total current through the load.

Accepted Answer

A)  12 mA 
B)  20 mA 
C)  1.2 mA 
D)  1.0 mA

Question 7

When using the superposition theorem on a two source network, if the current produced by one source is in one direction, while that produced by the other source is in the opposite direction through the same resistor:

Accepted Answer

A)  all voltage sources were not properly converted to current sources. 
B)  the absolute values of the two currents add algebraically, and the direction is the same as the direction of the larger current. 
C)  the resulting current is the difference of the two and has the direction of the larger current. 
D)  a mistake in the sign of the result occurred.

Question 8

Figure 8-2
-If two currents are in opposing directions through a branch of a circuit, in what direction will the net current flow?

Accepted Answer

A)  in the direction of the smaller current 
B)  The net current always flows down through a resistor. 
C)  in the direction of the larger current 
D)  Opposing currents will always cancel each other out.

Question 9

Thevenin's theorem states that the Thevenin voltage is equal to:

Accepted Answer

A)  open circuit current at the networks terminals 
B)  short circuit voltage at the networks terminals 
C)  open circuit voltage at the networks terminals 
D)  short circuit current at the networks terminals

Question 10

Under maximum power transfer conditions, which one is true?

Accepted Answer

A)  The algebraic sum of all resistances in the source equals the algebraic sum of all the resistances in the load. 
B)  The equivalent load resistance is very large compared to the equivalent of the source. 
C)  The Thevenin resistance of the source equals the equivalent resistance of the load. 
D)  The equivalent load resistance is very small compared to the equivalent of the source.

Question 11

The first step in Nortonizing a circuit is to short out the load.

Accepted Answer

A) True 
 B)False

Question 12

-The superposition method for calculating voltages and currents requires:

Accepted Answer

A)  opening the load resistance. 
B)  taking one source at a time, with other voltage sources replaced by an open circuit. 
C)  taking one source at a time, and replacing other sources with their internal resistances. 
D)  replacing the load resistance with a short circuit.

Question 13

Open circuit voltage refers to:

Accepted Answer

A)  the voltage taken across a high value load resistor. 
B)  the output voltage with no load. 
C)  the voltage taken across a low value load resistor. 
D)  zero internal resistance.

Question 14

An ideal current source has internal resistance.

Accepted Answer

A)  infinite 
B)  low 
C)  high 
D)  zero

Question 15

An ideal current source has infinite internal resistance.

Accepted Answer