Question 1

In a balanced Y-connected load, the total power dissipated by a balanced load is ______________ times the power dissipated by an individual load.

Accepted Answer

three

Question 2

The term phase always refers to the delta configuration.

Accepted Answer

A) True 
 B)False  False

Question 3

In a Y-Y configuration, since the neutral point is connected between the source and the load,

Accepted Answer

A)  this is a three-phase four-wire system 
B)  this is a single-phase four-wire system 
C)  this is a three-phase three-wire system 
D)  this is a single-phase three-wire system 
A)  this is a three-phase four-wire system 
B)  this is a single-phase four-wire system 
C)  this is a three-phase three-wire system 
D)  this is a single-phase three-wire system A

Question 4

In a ∆-connected three-phase generator, the ______________ voltages are 120° out of phase with each other.

Accepted Answer

The answer of In a ∆-connected three-phase generator, the ______________...

Question 5

In a Y-connected three-phase generator, the line voltage, VL equals ______________.

Accepted Answer

Question 6

In this figure (27-1) below, the connection of the generator windings is called the

Accepted Answer

A)  Y 
B)  ? 
C)  Neutral 
D)  Sine 
A)  Y 
B)  ? 
C)  Neutral 
D)  Sine

Question 7

In a balanced Y-connected load,

Accepted Answer

A)  each load impedance dissipates an equal amount of power 
B)  each load impedance dissipates different amounts of power 
C)  load impedances dissipate zero power 
D)  load impedances dissipate very high power 
A)  each load impedance dissipates an equal amount of power 
B)  each load impedance dissipates different amounts of power 
C)  load impedances dissipate zero power 
D)  load impedances dissipate very high power

Question 8

In a Y-? configuration, each load impedance has the full line voltage across it.

Accepted Answer

A) True 
 B)False

Question 9

The figure shown (27-14) below shows a Y-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

Question 10

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

Accepted Answer

The answer of In a Y-connected generator, the voltage across...

Question 11

In a balanced three-phase AC circuit, the instantaneous power delivered to the load

Accepted Answer

A)  is steady 
B)  is zero 
C)  is extremely high 
D)  decreases to zero twice during each cycle of alternating voltage 
A)  is steady 
B)  is zero 
C)  is extremely high 
D)  decreases to zero twice during each cycle of alternating voltage

Question 12

The total power dissipated by a balanced Y-connected load is three times the power dissipated by an individual load.

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

As compared to single-phase motors, three-phase motors

Accepted Answer

A)  need a special starting capacitor 
B)  are smaller 
C)  weigh more 
D)  less economical 
A)  need a special starting capacitor 
B)  are smaller 
C)  weigh more 
D)  less economical

Question 15

In a delta-connected generator, the phase voltage and the line voltage are much less than the voltage induced across each coil winding in the generator.

Accepted Answer

A) True 
 B)False

Question 16

Close examination of the circuit connections shown in this figure (27-16(a)) below, shows that the current

Accepted Answer

A)  in each load is equal to its corresponding line current 
B)  in each load is greater than its corresponding line current 
C)  in each load is less than its corresponding line current 
D)  in each load is always zero 
A)  in each load is equal to its corresponding line current 
B)  in each load is greater than its corresponding line current 
C)  in each load is less than its corresponding line current 
D)  in each load is always zero

Question 17

In a delta-connected three-phase AC generator,

Accepted Answer

A)  IL­ = 1/?3I? 
B)  IL = 3?I? 
C)  IL = 3/I? 
D)  IL = ?3I? 
A)  IL­ = 1/?3I? 
B)  IL = 3?I? 
C)  IL = 3/I? 
D)  IL = ?3I?

Question 18

In general, the load voltage, VZ, in a ______________ configuration equals VL/√3.

Accepted Answer

Question 19

Four-wire systems are useful when it is desired to have different load voltages.

Accepted Answer

A) True 
 B)False

Question 20

In a ∆-connected three-phase AC generator, line current, IL equals ______________.

Accepted Answer

Exam 28: Three-Phase Ac Power Systems

In a balanced Y-connected load, the total power dissipated by a balanced load is ______________ times the power dissipated by an individual load.

The term phase always refers to the delta configuration.

In a Y-Y configuration, since the neutral point is connected between the source and the load,

In a ∆-connected three-phase generator, the ______________ voltages are 120° out of phase with each other.

In a Y-connected three-phase generator, the line voltage, VL equals ______________.

In this figure (27-1) below, the connection of the generator windings is called the

In a balanced Y-connected load,

In a Y-? configuration, each load impedance has the full line voltage across it.

The figure shown (27-14) below shows a Y-connected generator driving a balanced,

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

In a balanced three-phase AC circuit, the instantaneous power delivered to the load

The total power dissipated by a balanced Y-connected load is three times the power dissipated by an individual load.

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

As compared to single-phase motors, three-phase motors

In a delta-connected generator, the phase voltage and the line voltage are much less than the voltage induced across each coil winding in the generator.

Close examination of the circuit connections shown in this figure (27-16(a)) below, shows that the current

In a delta-connected three-phase AC generator,

In general, the load voltage, VZ, in a ______________ configuration equals VL/√3.

Four-wire systems are useful when it is desired to have different load voltages.

In a ∆-connected three-phase AC generator, line current, IL equals ______________.

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 a Y-connected three-phase generator, the line voltage, V_L equals ______________.

In general, the load voltage, V_Z, in a ______________ configuration equals V_L/√3.

In a ∆-connected three-phase AC generator, line current, I_L equals ______________.