Question 1

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 2

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

Accepted Answer

Question 3

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 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 delta-connected three-phase AC generator,

Accepted Answer

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

Question 6

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 voltageE) All of the above
F) B) and C)

Question 7

The term phase always refers to the delta configuration.

Accepted Answer

A) True 
 B)False  False

Question 8

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

Accepted Answer

Question 9

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 systemE) All of the above
F) C) and D) A

Question 10

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

Accepted Answer

Question 11

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 zeroE) A) and C)
F) A) and D)

Question 12

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 powerE) B) and C)
F) C) and D)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 loadE) C) and D)
F) A) and B)

Question 15

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 economicalE) B) and D)
F) B) and C)

Question 16

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 17

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 18

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 19

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

Accepted Answer

A)   Y
B)   ?
C)   Neutral
D)   SineE) A) and B)
F) A) and C)

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 28: Three-Phase Ac Power Systems

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedthree

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

Correct AnswerverifiedShow Answer

In a delta-connected three-phase AC generator,

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The term phase always refers to the delta configuration.

Correct AnswerverifiedFalse

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a balanced Y-connected load,

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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False

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

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A

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

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