Question 1

Nearly all commercial, industrial, and residential power circuits are connected in parallel.

Accepted Answer

A) True 
 B)False  True

Question 2

What are two important differences between series and parallel circuits, which can be seen by looking at the magnitudes of the currents and impedances?

Accepted Answer

1. The current is at a maximum in a series resonant circuit and at a minimum in a parallel resonant circuit.
2. The impedance is at a minimum in a series resonant circuit and at a maximum in a parallel resonant circuit. These factors make parallel resonance a useful feature in tuned circuits.

Question 3

Before the power factor of a motor can be corrected, what must be determined first?

Accepted Answer

Before the power factor of a motor can be corrected, it must first be determined how much out of phase current and voltage are with each other.

Question 4

The power factor of the circuit is found by the use of the expression: PF = P + VI.

Accepted Answer

A) True 
 B)False

Question 5

In ____________________ circuits, the voltage triangle is divided and multiplied by current to obtain the impedance and power triangles, respectively.

Accepted Answer

The answer of In ____________________ circuits, the voltage triangle is...

Question 6

What are the advantages of unity power factor?

Accepted Answer

The answer of What are the advantages of unity power...

Question 7

How do we know that a voltage vector is a reference vector?

Accepted Answer

The answer of How do we know that a voltage...

Question 8

The apparent power or volt-amperes of the circuit can be determined by multiplying the applied voltage by the total current.

Accepted Answer

A) True 
 B)False

Question 9

The amount of reactive power or VARs (volt-amperes-reactive) can be determined using the formula: VARs = P/VA.

Accepted Answer

A) True 
 B)False

Question 10

Before you can calculate the amount of capacitance that is needed, what must you first determine?

Accepted Answer

The answer of Before you can calculate the amount of...

Question 11

In a series circuit at the ____________________ point, the effects of inductive reactance and capacitive reactance cancel each other.

Accepted Answer

The answer of In a series circuit at the ____________________...

Question 12

The total (line) current for an ac parallel circuit may not be equal to the arithmetic sum of the current in each of the branch circuits.

Accepted Answer

A) True 
 B)False

Question 13

The voltage across any branch circuit in a parallel arrangement is the same as the ____________________ voltage.

Accepted Answer

The answer of The voltage across any branch circuit in...

Question 14

In ____________________ circuits, the current triangle is divided by the reference vector V to obtain the impedance triangle.

Accepted Answer

The answer of In ____________________ circuits, the current triangle is...

Question 15

The current in a series circuit reaches its maximum value at ____________________.

Accepted Answer

The answer of The current in a series circuit reaches...

Exam 8: Ac Parallel Circuits

Nearly all commercial, industrial, and residential power circuits are connected in parallel.

What are two important differences between series and parallel circuits, which can be seen by looking at the magnitudes of the currents and impedances?

Before the power factor of a motor can be corrected, what must be determined first?

The power factor of the circuit is found by the use of the expression: PF = P + VI.

In ____________________ circuits, the voltage triangle is divided and multiplied by current to obtain the impedance and power triangles, respectively.

What are the advantages of unity power factor?

How do we know that a voltage vector is a reference vector?

The apparent power or volt-amperes of the circuit can be determined by multiplying the applied voltage by the total current.

The amount of reactive power or VARs (volt-amperes-reactive) can be determined using the formula: VARs = P/VA.

Before you can calculate the amount of capacitance that is needed, what must you first determine?

In a series circuit at the ____________________ point, the effects of inductive reactance and capacitive reactance cancel each other.

The total (line) current for an ac parallel circuit may not be equal to the arithmetic sum of the current in each of the branch circuits.

The voltage across any branch circuit in a parallel arrangement is the same as the ____________________ voltage.

In ____________________ circuits, the current triangle is divided by the reference vector V to obtain the impedance triangle.

The current in a series circuit reaches its maximum value at ____________________.