Question 1

In a ______________ configuration, each load impedance has the full line voltage across it.

Accepted Answer

The answer of In a ______________ configuration, each load impedance...

Question 2

In a Y-Y system with a balanced load, the current in the neutral wire is always

Accepted Answer

A)  very high 
B)  zero 
C)  greater than the load current 
D)  greater than the line current 
A)  very high 
B)  zero 
C)  greater than the load current 
D)  greater than the line current

Question 3

This figure (27-15) below shows a ∆-connected generator driving a balanced, ______________ load.

Accepted Answer

The answer of This figure (27-15) below shows a ∆-connected...

Question 4

In this figure (27-5) below, phasors VBN angle ? and VNB angle ? are

Accepted Answer

A)  equal in magnitude but 90° out of phase with each other 
B)  equal in magnitude but 180° out of phase with each other 
C)  equal in magnitude and in phase with each other 
D)  not equal in magnitude and 180° out of phase with each other 
A)  equal in magnitude but 90° out of phase with each other 
B)  equal in magnitude but 180° out of phase with each other 
C)  equal in magnitude and in phase with each other 
D)  not equal in magnitude and 180° out of phase with each other

Question 5

In the ?-? configuration shown in this figure (27-15) below, the magnitude of each voltage is the same, but the load voltages are

Accepted Answer

A)  45° out of phase 
B)  90° out of phase 
C)  120° out of phase 
D)  180° out of phase 
A)  45° out of phase 
B)  90° out of phase 
C)  120° out of phase 
D)  180° out of phase

Question 6

Three-phase systems are more efficient and more economical to implement and use than single-phase systems.

Accepted Answer

A) True 
 B)False

Question 7

When using any of the power formulas, the phase angle, θ, is the phase angle of the ______________.

Accepted Answer

The answer of When using any of the power formulas,...

Question 8

In a Y-connected generator, VL is equal to

Accepted Answer

A)  ?3V? 
B)  3?V? 
C)  1/?3V? 
D)  V??3 
A)  ?3V? 
B)  3?V? 
C)  1/?3V? 
D)  V??3

Question 9

When using any of the power formulas, the phase angle, ?, is the

Accepted Answer

A)  phase angle of the current 
B)  phase angle of the voltage 
C)  phase angle of the impedance 
D)  phase angle of the resistance 
A)  phase angle of the current 
B)  phase angle of the voltage 
C)  phase angle of the impedance 
D)  phase angle of the resistance

Question 10

In a Y-connected generator, the voltage across any combination of output terminals is called the

Accepted Answer

A)  load voltage 
B)  terminal voltage 
C)  line voltage 
D)  phase voltage 
A)  load voltage 
B)  terminal voltage 
C)  line voltage 
D)  phase voltage

Question 11

In a Y-Y configuration shown in this figure (27-13) below, the circuit connections reveal that each load impedance is in ______________ with a phase voltage.

Accepted Answer

The answer of In a Y-Y configuration shown in this...

Question 12

In a Y-connected three-phase AC generator, the formula used to calculate the phase voltage, Vθ is ______________.

Accepted Answer

The answer of In a Y-connected three-phase AC generator, the...

Question 13

In a balanced Y-connected load, each load impedance dissipates an equal amount of power.

Accepted Answer

A) True 
 B)False

Question 14

In any three-phase source/load configuration, if all of the impedances in a load are not identical, the load is said to be ______________.

Accepted Answer

The answer of In any three-phase source/load configuration, if all...

Question 15

In general, the load voltage, VZ in a ?-Y configuration equals

Accepted Answer

A)  ?3/VL 
B)  VL/?3 
C)  3?VL 
D)  VL?3 
A)  ?3/VL 
B)  VL/?3 
C)  3?VL 
D)  VL?3

Question 16

The output from a delta-connected three-phase AC generator can only be connected to a load that is arranged in a Y configuration.

Accepted Answer

A) True 
 B)False

Question 17

In a Y-connected generator, the voltage across any combination of output terminals such as A and B, B and C, or C and A is called the line voltage.

Accepted Answer

A) True 
 B)False

Question 18

In a Y-Y system with a balanced load, the current in the neutral wire is always ______________.

Accepted Answer

The answer of In a Y-Y system with a balanced...

Question 19

Because each line current is a combination of two phase currents, the line current is greater than any individual phase current.

Accepted Answer

A) True 
 B)False

Question 20

The figure shown (27-15) below shows a ?-connected generator driving a balanced,

Accepted Answer

A)  Y-connected load 
B)  ?-connected load 
C)  phase-connected load 
D)  neutral-connected load 
A)  Y-connected load 
B)  ?-connected load 
C)  phase-connected load 
D)  neutral-connected load

Exam 28: Three-Phase Ac Power Systems

In a ______________ configuration, each load impedance has the full line voltage across it.

In a Y-Y system with a balanced load, the current in the neutral wire is always

This figure (27-15) below shows a ∆-connected generator driving a balanced, ______________ load.

In this figure (27-5) below, phasors VBN angle ? and VNB angle ? are

In the ?-? configuration shown in this figure (27-15) below, the magnitude of each voltage is the same, but the load voltages are

Three-phase systems are more efficient and more economical to implement and use than single-phase systems.

When using any of the power formulas, the phase angle, θ, is the phase angle of the ______________.

In a Y-connected generator, VL is equal to

When using any of the power formulas, the phase angle, ?, is the

In a Y-connected generator, the voltage across any combination of output terminals is called the

In a Y-Y configuration shown in this figure (27-13) below, the circuit connections reveal that each load impedance is in ______________ with a phase voltage.

In a Y-connected three-phase AC generator, the formula used to calculate the phase voltage, Vθ is ______________.

In a balanced Y-connected load, each load impedance dissipates an equal amount of power.

In any three-phase source/load configuration, if all of the impedances in a load are not identical, the load is said to be ______________.

In general, the load voltage, VZ in a ?-Y configuration equals

The output from a delta-connected three-phase AC generator can only be connected to a load that is arranged in a Y configuration.

In a Y-connected generator, the voltage across any combination of output terminals such as A and B, B and C, or C and A is called the line voltage.

In a Y-Y system with a balanced load, the current in the neutral wire is always ______________.

Because each line current is a combination of two phase currents, the line current is greater than any individual phase current.

The figure shown (27-15) below shows a ?-connected generator driving a balanced,

Introduction

Electricity

Resistors

Ohms Law

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Voltage Dividers and Current Dividers

Analog and Digital Multimeters

Kirchhoff S Laws

Network Theorems

Conductors and Insulators

Batteries

Magnetism

Electromagnetism

Alternating Voltage and Current

Capacitance

Capacitive Reactance

Capacitive Circuits

Inductance

Inductive Reactance

Inductive Circuits

RC and LR Time Constants

Alternating Current Circuits

Complex Numbers for Ac Circuits

Resonance

Filters

Diodes and Diode Applications

Bipolar Junction Transistors

Transistor Amplifiers

Field Effect Transistors

Power Amplifiers

Thyristors

Operational Amplifiers

Filters

In this figure (27-5) below, phasors V_BN angle ? and V_NB angle ? are

In a Y-connected generator, V_L is equal to

In general, the load voltage, V_Z in a ?-Y configuration equals