FINALS!!!!!!

Two lead motor

Another way to refer a shaded pole induction motor?

DRAW 2 POSITION DOUBLE BREAK PG 121

DRAW 2 POSITION DOUBLE BREAK PG 121

DRAW 2 POSITION SINGLE BREAK PG 121

DRAW 2 POSITION SINGLE BREAK PG 121

DRAW 3 POSITION DOUBLE BREAK PG 121

DRAW 3 POSITION DOUBLE BREAK PG 121

DRAW 3 POSITION SINGLE BREAK PG 121

DRAW 3 POSITION SINGLE BREAK PG 121

shaded coil

In a shaded pole induction motor, the rotating magnetic field is created by a?

air timers

Pnuematic timers are often referred to as?

Current

The movement of electrons is called?

True

True or False. Electrons have a negative charge.

False

True or False. Voltage is not the force that causes electrons to move.

False

True or False. You can have a voltage at only one point.

True

True or False. You can only have a voltage when you have a difference of electrical potential between two points.

True

True or False. ground is commonly connected to the neutral and sometimes to Line 2

True

True or False. split phase or P.S.C motor can be reversed by changing the direction of current flow through the start or run winding but not both.

Voltage

What is the measurement of the difference of electrical potential between 2 points.

circuit breakers and fuses

What provides short circuit protection?

pnuematic timers

What type of timer operate by restricting the flow of air through an orifice to a rubber bellows or diaphragm?

Permanent split capacitor

Whats P.S.C stand for?

branch circuit

Whats everything (loads, devices, conductors, etc.) after the final over current device.

magnetic starter

a contactor with an overload relay assembly

N.C.T.O

abbreviation for normally close time delay to open

N.C.T.C

abbreviation for normally close time delay to re-close

N.O.T.C

abbreviation for normally open time delay in closing

N.O.T.O

abbreviation for normally open time delay to re-open

8 times per hour

although the capacitor-start induction run motor has a high starting torque, the motor should not be started more than ?

overload

another word for running protection?

short circuit

another word for starting protection?

contactor

big relay. handles higher current 10A or more.

one direction

dc flows in how many directions?

heat

electric current produces?

thermal devices

electrical circuits can be protected against overloads by ?

relay

electromagnetic switch. solenoid and plunger device

600 volts or less

how many volts does fuses go up too?

bigger wire (thicker)

if the motor flc is high the stator winding must be made out of?

small wire

if the motor flc is low the stator winding must be made out of?

cannot

if the selector switch is in the off position the coil ____ be energized and the motor will be off.

automatic

in the ______ position, the coil will only be energized when the 2 wire pilot device is in its closed position.

stator windings

long piece of wires that has been covered with a very thin coating of insulation and wrapped into a coil

coil, plunger, contacts

main parts of the relay is ?

40%

no load current is approximately how many percentage of flc?

Electrical charge

objects become electrically charged by adding or removing electrons from them.

10

pilot devices are usually designed to carry how many amps max?

fractional

shaded pole motor are generally used for fractional or integral horsepower motors?

ground fault

special kind of short circuit that occurs when one of the line conductors comes into direct contact with a grounded metal part of the electrical system.

motor current

the current drawn by a motor is proportional to its load. the greater the load connected to the shaft of the motor, the more current the motor must draw to enable its shaft to move the load.

full load current

the current drawn by a motor when its producing its rated horsepower at its rated torque.

locked rotor current

the current drawn by a motor when the shaft is unable to turn. it is approximately 6 times the full load current. also called the "in rush" current

no load current

the current drawn by the motor windings when there is nothing connected to the shaft of the motor.

voltage

the difference of electrical potential between two points

draw more current

the only way a motor can produce more power is to?

feeders

the wires or circuits that connect between panels or enclosures

synchronous speed

this refers to the speed of the rotating magnetic field of the stator?

resistive, inductive and capacitive

three types of AC loads are?

sine, square, sawtooth

three types of ac wave forms are?

common, separate, control circuit transformer

three types of control circuits.

pure, varying, pulsating

three types of dc wave forms are?

Add electrons

to give an object a negative charge

Remove electrons

to give an object a positive charge

False

true or false The plunger is not being held closed by a latch on a latching relay.

true

true or false. a relay is not a manual switch. you don't manually open or close a relays contact as you would a toggle switch

false

true or false. ac reverses its direction of current flow never at periodic intervals.

false

true or false. branch circuits never connects to loads.

true

true or false. feeders never connect to loads.

true

true or false. fuses come in many shape and sizes.

false

true or false. inductors does not oppose a change of current

True

true or false. latching relays (contactor) has 2 coils (on and off)

false

true or false. pilot devices and selector switches cannot be used with manual motor starters.

True

true or false. pneumatic timers are unaffected by variations in ambient temperature or atmospheric pressure.

true

true or false. the 2 characteristics of resistive loads are they produce heat and the voltage and current are in phase.

true

true or false. three types of split phase motors are resistance start induction run, capacitor start induction run and capacitor start capacitor run

false

true or false. timing relays do not have timed contacts

true

true or false. you cannot change the voltage applied to a motor when the motor needs to produce more power.

Two leads

voltmeters has how many leads?

horsepower

volts x amps

pushbuttons

what are momentary contact devices?

inductor

what is a coil of wire?

shaded pole motor

what is another common type of single phase induction motor?

trip free

what is it called when the contacts of manual motor starters cannot be held closed manually when the overload relay has tripped.

HAND OFF AUTOMATIC switch

what is used so a motor can be controlled manually by an operator or automatically by using a 2 wire pilot?

manual motor starter

what motor has an on-off switch with motor overload protection?

dc motor

what motor works on the principle of the attraction and repulsion of magnetic fields.

induction motor

what motor works on the principle of the rotating magnetic field?

overload heater

what provides running protection?

clearing contacts

what type of contacts you use when a latching relay is controlled by a maintained contact device?

pushbutton interlocking

what type of interlocking prevents 2 coils from being energized at the same time

mechanical interlocking

what type of interlocking prevents 2 plungers from being closed at the same time.

contact interlocking

what type of interlocking prevents two or more coils to be energized at the same time

L1, L2, L3, N

what're the four possible different electric potentials?

conductor, magnetic field, movement

what're the three things magnetic induction need to take place?

overload, short circuit, ground fault

what're the three types of over current?

fractional hp and integral hp

what're the two types of manual motor starters?

overload

when the current drawn by a load exceeds the rated ampacity of the circuit conductors.

off delay

when the relay coil is energized, the off delay contacts go to their alternate position immediately. When the coil is de-energized, the contacts delay returning to their normal position. what type of delay is this?

on delay

when the relay coil is energized, there is a delay until the contacts go to their alternate state position. when the coil is de-energized, on delay contacts will return to their normal position immediately, without a delay. What type of delay is this?

short circuit

when there is a low impedance path for current that by-passes the load.

control and power

when using an electromagnetic switch (relay or contactor) to control a load, what are the 2 separate circuits?

service

where the power from the utility company enters the building. this includes the meter and the main fuses or breaker and the enclosure they're located in

off coil

which coil controls the latch on a latching relay?

No charge

zero potential is a place in a circuit where there is?