Test 1-ch. 9 & 10, generator videos & safety

The most common shock related, non-fatal injury is a ________.

burn

A disadvantage of permanent magnets is that their magnetic lines of force _______ as the age of the magnet increases.

decrease

There are _____ types of DC generators.

three

Total power demand consists of Consumer demand plus ________ ________ ________.

power system losses

________ power interruption is a decrease to 0V on all power lines for a period of more than 1 min.

Sustained

_______-phase generators provide a more consistent than single-phase generators.

Three

The MVAR output of a generator is increased by increasing the _____________.

excitation

The AC voltage controller knows what the generator output voltage is through an instrument called a _______ _______.

voltage transformer

_______ current is any current that is not in its intended path.

Fault

Always ________ a circuit to make sure it is ____________ before working on it.

test de-energized

Reactive power is _______⁰ out of phase.

90

What three factors influence the severity of electrical shock?

Amount, duration, and path of current.

_______-________ occurs when powerful, high amperage currents arc thru the air across a gap between conductors and temperatures can reach as high as _________⁰F.

Arc-blasts, 35,000

_________ is joining electrical parts to assure a conductive path.

Bonding

If the voltage output control is in Auto mode, how would the operator adjust the voltage value coming out of the generator?

Change set-point

__________ creates a path for currents produced by unintended voltages on exposed parts.

Grounding

__________ power interruption is a decrease to 0V on one or more power lines lasting for more than 3 seconds up to 1 min.

Temporary

AC generators, also referred to as _______ , convert mechanical energy into AC voltage and current.

alternators

What value does a GFCI trip at?

4-6mA

What does GFCI stand for?

Ground Fault Circuit Interrupt

The three ends of a wye-connected AC generator can be safely connected at the ______ point because no voltage difference exists between them.

neutral

what value of current is typically considered necessary for death to occur?

100mA

The output of a 3-phase AC generator results in three output voltages ______⁰ out of phase with each other.

120

A momentary power interruption is a decrease to 0 V on one or more power lines lasting from 0.5 cycles up to ______ sec.

3

What are the three stages of the Safety Model?

Recognize, evaluate, and control hazards

________ is the maximum amount of current a wire can carry without over-heating.

Ampacity

The restricted approach boundary is ____ft.

1

The limited approach boundary is _____ft.

3ft 6in

When using a brush-less exciter, is the voltage on the magnetic field AC or DC?

DC

___________ power interruption is a decrease to 0V on one or more power lines lasting from 0.5 cycles up to 3 seconds.

Momentary

The ______ ______ _______ is a comprehensive listing of practices to protect workers and equipment form electrical hazards such as fire and electrocution.

National Electrical Code

Is the severity of a shock received independent of whether you are wet or dry?

No

The _________ ________ and ________ ________, is the Federal Agency in the U.S. Department of Labor that establishes and enforces workplace safety and health regulations.

Occupational Safety and Health Administartion

_______ _________ _________ switching is a process in which power is momentarily disconnected when switching a circuit form one voltage supply (or level) to another.

Open circuit transition

A brush is the sliding contact that rides against the commutator segments or slip rings and is used to connect the ________ to the external circuit.

armature

AC generators use slip rings to connect the _________ to the external circuit (load).

armature

An _______ is the movable coil of wire in a generator that rotates through the magnetic field.

armature

Each complete rotation of the ______ in a single-phase AC generator produces one complete alternating current cycle.

armature

Slip rings are metallic rings connected to the ends of an armature and are used to connect the induced voltage to the _________.

brushes

Although increasing the number of ________ reduces the ripples in the output voltage, it is impossible to remove the ripples completely.

coils

A ________ is a ring made of segments that are insulated from one another.

commutator

A_______-wound generator is a generator that includes series and shunt field windings.

compound

Most generators use electromagnets, which must be supplied with ________.

current

A _________ connection is a connection that has each coil end connected end-to-end to form a closed loop.

delta

The three types of burn injuries are ______ burns, ______ burns, and _______ _______ burns.

electrical, arc, thermal contact

The difference between the types of DC generators is based on the relationship of the _______ to the external circuit.

field windings

If power demand is greater than power production, then _______ will fall.

frequency

For long-term power interruption protection, a ______ is used.

generator/UPS

Generator automatic speed control is done through either the AGC or _________.

governor

When an electrical system is __________, a low resistance path to earth is created.

grounded

Commutator segments reverse the connections to the brushes every _____ cycle

half

The ______ generator rule is the relationship between the current in a conductor and the magnetic field existing around the conductor.

left-hand

Phase-to-phase voltage is also referred to as _______ voltage.

line

Field windings are electromagnets used to produce the ______ field in a generator.

magnetic

The __________ controls the regulator, if the field voltage regulator is set to manual.

operator

A shunt-wound generator is a generator that has its field windings connected in ______ with the armature and the external circuit (load).

parallel

The pulsations of a DC generator's output voltage are known as ______.

ripples

Because of their poor voltage regulation, _______-wound DC generators are not used frequently.

series

If the generator excitation voltage is too small the rotor current becomes too small and may cause the generator to lose _________.

synchronism

A _________ power interruption is a decrease to 0 V on one or more power lines lasting for more than 3 sec up to 1 min.

temporary

A surge suppressor is an electrical device that provides protection from _______ voltages by limiting the level of voltage allowed downstream from the surge suppressor.

transient

The total voltage of a full rotation of an armature is _______ the voltage of each coil in half.

twice

The amount of ________ induced in a coil is determined by the rate at which the coil is rotated in a magnetic field.

voltage

A ________ connection is a connection that has one end of each coil connected together and the other end of each coil left open for external connections.

wye