HART-2431 Chapter 7 (Alternating Current, Power
Distribution, and Voltage Systems) Questions With
Complete Solutions
How is alternating current produced? Correct Answers It is
produced by cutting a magnetic field with a conductor.
How is effective amperage determined? Correct Answers AC
amperage is 0.707 times the peak amperage.
How is single-phase current produced? Correct Answers
Single-phase current is produced by an alternator with one
winding in the stator
How is the stinger leg identified? Correct Answers The high
(stinger) leg should be identified by an orange marking.
How is three-phase current produced? Correct Answers Three-
phase current is produced by an alternator with three windings in
the stator that are wound 120° apart.
What are the four basic voltage-current characteristics available?
Correct Answers The four basic voltage-current characteristics
available are 240 Volt/single phase/60 hertz, 240 Volt/three
phase/60 hertz, 208 Volt/three phase/60 hertz, and 480
Volt/three phase/60 hertz.
What are the two types of reactance in AC circuits? Correct
Answers There are two types of reactance in AC circuits:
inductive reactance and capacitive reactance.
, What are the two types of three-phase voltage systems? Correct
Answers There are basically two types of three-phase voltage
systems used in commercial and industrial wiring systems: the
delta transformer hookup, which will supply 240V/3Ø/60Hz,
and the wye transformer hookup, which will supply
208V/3Ø/60Hz or 480V/3Ø/60Hz.
What are three advantages to using three-phase power? Correct
Answers The electric power consumer can buy three-phase
electric power cheaper than single-phase. Three-phase electric
motors require no special starting apparatus. Three-phase power
offers better starting and running characteristics for motors.
What determines the strength of the magnetic field in a circuit?
Correct Answers The amperage of a circuit determines the
strength of the magnetic field in the circuit.
What does a 240V/1Φ/60Hz system consist of? Correct
Answers This voltage system consists of three wires: two hot
wires and one ground.
What is a sine wave? Correct Answers A graphical
representation of alternating current; a graph showing the sine
function of all angles from 0 to 360 degrees.
What is abbreviation for phase? Correct Answers Ø (Greek
letter phi) is the symbol for phase
What is alternating current? Correct Answers Alternating
current is an alternating (back and forth) flow of electrons; that
Distribution, and Voltage Systems) Questions With
Complete Solutions
How is alternating current produced? Correct Answers It is
produced by cutting a magnetic field with a conductor.
How is effective amperage determined? Correct Answers AC
amperage is 0.707 times the peak amperage.
How is single-phase current produced? Correct Answers
Single-phase current is produced by an alternator with one
winding in the stator
How is the stinger leg identified? Correct Answers The high
(stinger) leg should be identified by an orange marking.
How is three-phase current produced? Correct Answers Three-
phase current is produced by an alternator with three windings in
the stator that are wound 120° apart.
What are the four basic voltage-current characteristics available?
Correct Answers The four basic voltage-current characteristics
available are 240 Volt/single phase/60 hertz, 240 Volt/three
phase/60 hertz, 208 Volt/three phase/60 hertz, and 480
Volt/three phase/60 hertz.
What are the two types of reactance in AC circuits? Correct
Answers There are two types of reactance in AC circuits:
inductive reactance and capacitive reactance.
, What are the two types of three-phase voltage systems? Correct
Answers There are basically two types of three-phase voltage
systems used in commercial and industrial wiring systems: the
delta transformer hookup, which will supply 240V/3Ø/60Hz,
and the wye transformer hookup, which will supply
208V/3Ø/60Hz or 480V/3Ø/60Hz.
What are three advantages to using three-phase power? Correct
Answers The electric power consumer can buy three-phase
electric power cheaper than single-phase. Three-phase electric
motors require no special starting apparatus. Three-phase power
offers better starting and running characteristics for motors.
What determines the strength of the magnetic field in a circuit?
Correct Answers The amperage of a circuit determines the
strength of the magnetic field in the circuit.
What does a 240V/1Φ/60Hz system consist of? Correct
Answers This voltage system consists of three wires: two hot
wires and one ground.
What is a sine wave? Correct Answers A graphical
representation of alternating current; a graph showing the sine
function of all angles from 0 to 360 degrees.
What is abbreviation for phase? Correct Answers Ø (Greek
letter phi) is the symbol for phase
What is alternating current? Correct Answers Alternating
current is an alternating (back and forth) flow of electrons; that
