Deck 13: Resistive-Inductive Series Circuits

Question 1

While vectors can be added, subtracted, multiplied, and divided, in electrical work ____ is the only function needed.

A) addition
B) division
C) multiplication
D) subtraction

Answer 1

A

Question 2

True power for a resistive-inductive circuit can be computed by using any of the watts formulas with pure ____ parts of the circuit.

A) inductive
B) capacitive
C) reactive
D) resistive

Answer 2

D

Question 3

Because resistive-inductive circuits have periods in which voltage and current have opposite signs and where power is returned to the circuit, VARs is often referred to as ____ power.

A) apparent
B) wattless
C) resistive
D) true

Answer 3

B

Question 4

When a pure ____________________ load is connected to an alternating current circuit, the voltage and current are in phase with each other.

Question 5

VARs represents the product of volts and amps that are ____ phase with each other.

A) 90 degrees out of
B) 180 degrees out of
C) 270 degrees out of
D) in

Question 6

To add vectors that are ____ degrees apart, subtract the magnitude of the larger vector from the magnitude of the smaller vector.

A) 0
B) 90
C) 180
D) 270

Question 7

The ____ of angle theta is the power factor.

A) sine
B) cosine
C) tangent
D) cotangent

Question 8

When working with vectors, ____ degrees is indicated by a horizontal line.

A) 0
B) 90
C) 180
D) 270

Question 9

Since true power, or watts, can be produced only when the ____ are both positive or both negative, only resistive parts of the circuit can produce watts.

A) amperage and resistance
B) voltage and resistance
C) voltage and current
D) amperage and reactance

Question 10

VARs is the amount of ____ power in a resistive-inductive circuit.

A) resistive
B) inductive
C) apparent
D) reactive

Question 11

In resistive-inductive circuits, the resistive and inductive voltages form the legs of a triangle, while the total voltage will be the ____.

A) third leg of an equilateral triangle
B) third leg of an isosceles triangle
C) hypotenuse of a right triangle
D) none of the above

Question 12

The ____ power of a resistive-inductive series circuit can be found when a voltmeter and ammeter are used to measure the circuit voltage and current and then these measured values are multiplied together.

A) reactive
B) apparent
C) wattless
D) quadrature

Question 13

In a resistive-inductive circuit, the voltage drop across a resistor is found using quantities that pertain only to the ____ part of the circuit.

A) inductive
B) resistive
C) reactive
D) capacitive

Question 14

In a resistive-inductive circuit, power factor can be computed by dividing the voltage drop across the resistor by the ____.

A) circuit amperage
B) total circuit resistance
C) total circuit voltage
D) circuit volt-amps

Question 15

In series circuits, the total voltage is equal to the ____ of the voltage drops.

A) product
B) square root
C) sum
D) none of the above

Question 16

One of the primary laws of series circuits is that the ____ must be the same in any part of the circuit.

A) resistance
B) voltage
C) wattage
D) current

Question 17

When an alternating current circuit has both resistance and inductance, the exact amount of phase angle difference between the voltage and current is determined by ____.

A) adding the resistance and the inductance
B) multiplying the resistance and the inductance
C) multiplying the voltage and the current
D) the ratio of the resistance to the inductance

Question 18

While electric power is sold on the basis of watts consumed, the power company must supply the ____ power.

A) true
B) wattless
C) apparent
D) reactive

Question 19

When a circuit containing both resistance and inductance is connected to an alternating current circuit, the voltage and current will be out of phase with each other between ____ degrees.

A) 180 to 270
B) 0 to 90
C) 0 to 180
D) 90 to 180

Question 20

When a pure ____________________ load is connected to an alternating circuit, the voltage and amperage are 90 degrees out of phase with each other.

Question 21

The angular displacement by which voltage and current are out of phase with each other is called _________________________.

Question 22

A _________________________ is a four-sided form whose opposite sides form parallel lines and whose angles are not required to be 90 degrees.

Question 23

A ____________________ is a line that represents magnitude, but not direction.

Question 24

VARs is an abbreviation for ______________________________.

Question 25

In a resistive-inductive circuit, the total ____________________ flow through the circuit can be computed by dividing the total applied voltage by the total current-limiting factor.

Question 26

Impedance is measured in ____________________.

Question 27

In an R-L series circuit, the current is the same through both the resistor and the ____________________.

Question 28

In resistive-inductive circuits, ____________________ cannot be found by multiplying the total voltage by the current flow through a resistor.

Question 29

A decimal value can be changed to a percent value by multiplying it by ____________________.

Question 30

A ____________________ is a line that indicates both magnitude and direction.

Question 31

_________________________ is the ratio of true power to apparent power.

Question 32

If an industrial plant consumes 5 MW of power per hour with a power factor of 60%, the power company must actually provide 8.33 MVA per hour. If the power factor were to increase to 95%, the power company would have to provide ____________________ MVA per hour to provide the same amount of power to the plant.

Question 33

Because the resistive part of a circuit and the reactive part of a circuit are out of phase with each other by 90 degrees, _________________________ must be used to find the sum of these two quantities.

Question 34

Impedance is symbolized by the letter ____________________.

Question 35

Volt-amperes is the ____________________ power of a resistive-inductive series circuit.

Question 36

Because inductive reactance is an inductive quantity and impedance is a circuit total quantity, Ohm's law cannot be used to find resistive quantities. ______________________________, however, can be used.