Chapter 12 review questions

Capacitor start, i Capacitor run. (CSCR) MOTOR

A....? .. is a single -phase induction motor that has a start capacitor wired in series with the Start Winding .

Permanent split capacitor PSC motor

A....? ... is a single -phase induction motor that use a single run capacitor in series with the starting for the motor entire operation

Dual voltage motor

A...? .. has its stator Winding arranged in pairs so that it can be used with two different voltage.

Startor

The current induced in the rotor create an electro magnetic field that interact with the Electromagnetic field created by the...?

Full load amps

The current level at which a motor full load torque and horsepower are reached is called the ......?amperage.

More coil turns

The starter winding has a higher inductance than that run Winding because it has...?

Polarity

The stator's pole switch .?...as the alternating current being applied to the winding in the startor switchs directions.

Field windings

The wiring wrapped around the field pole of the startor are call...?

Rotor and stator.

What are the two primary component of all electric motors..?

The starting Winding circuit is open by a centrifical switch or a starting relay.

What happens when a single phase induction motor reaches 60% to 70% of its rated full-load speed.

Difference between synchronize Sied and the rated full load speed.

What is a slip

120×60hz=7,200÷4, Poles=18.000 RPM Pages...254

What is synchronous speed of a four pole motor that operates at 60 hz...?

120x60=7,200 (7,200÷4= 18,000 RPM.

What is the synchronous speed of a four pole motor that operates at a frequency of 60 hz.?

True

When a split phase motor starting current goes through both the start and the Run windings.. is it true or false..?

Both A,B

(A )hermetic compressor motor is require special cooling provision. (B) requires leak proof electronic connections

Induction

....? ...Motors are a AC motor that operates by using the magnetic field generated in the stator to induce current in the rotor.

Field pole

A .....? is an electromagnet whole Polarity charge as the flow of current alternative in the field wing.

Field pole

A .....?... is an electromagnet whole Polarity charge as the flow of current alternative in the field wing.

Shaded- pole motor

A ..? ... is a low- torque single -phase motor that use covered field poles to produce starting torque.

Unloader

A device used to reduce a compressors load on Start-up is call...?

Displacement

A large phase.....? ...lead to a higher starting to torque, which means motor that use capacitor can start under heavier load.

Capacitor- start capacitor- run Page 260

Although permanent split capacitor motor have a low starting torque they operate the same as a ...? motor once they are running.

True

An electrical motor operates based on the principle of electricity and magnetism. is it true or false..?

Veritable frequency

Control circuit that modify the frequency of signal to see ecms are call....?

Create a rotating magnetic field in the startor causing the rotor to start turning

How does the phase splitting splitting assist in starting a single phase motor.

Motor Nameplate

Important Motors information such as rate voltage, full load amperage, frequency, phase and horsepower can be found on the ....?

Ture

Motor driven fan used to calculate air around the condenser are often wired to run when the compressor runs.. is it true or false.

Smaller gauge wire

Start Winding has a higher resistance than the Run Winding because it is made of.....?

Repulsion

The attraction of unlike poles and .......? Of like poles cause the rotor to rotate.

Both the start Winding and start capacitor.

The centrifugal switch on a capacitor -start induction- run motor disconnect the ......? when the motor reaches about 75% of its rated speed.

Counter (EMF)

The oppositely polarized voltage induced by the magnetic field in the rotor is call.....? Force.

False

The rotor in an electric motor is connected to a power source.. is it true or false...?

Frequency and number of fields poles...... Page..254

The speed of an AC motor is determined by which two factors...?

Rotor and stator Page. 252

The two main parts of a motor are the..?...

Dual- voltage Page....262

Three phase Motors are commonly ....? motor because their stator winding are arranged in pairs.

Other lead's terminal .

To reverse a three-phase motor direction of rotation, a technician must disconnect two power leads and connect each lead to the....?

Capacitor- start, capacitor- run motor. PG 260

Which type of motor has the starting torque to start under heavy load.?

False

the relationship among applied, counter EMF, and current cause the motor to run at varying speeds. is it true or false...?

Torque

Capacitors are used to generate higher starting ....? ...because it cause higher phase displacement between the start and Run windings

Reactance

Capacitors causes capacitive ....? ...in a circuit, which is opposition to the flow of a current that causes voltage to lag behind current in an AC cycle.

Permanent magnet

Ecms have rotors made of...? ....instead of coil of wire or metal bars

rated Full -load Speed. Page...255.

Slip is the difference between a Motor's synchronous speed and it's rated ..?..speed .

Capillary

Split phase Motors are very popular in HVAC system that use a......? ...tube metering device

Centrifugal switch

Split phase Motors use....? to disconnect start winding as the motor approaches running speed..

Phase splitting

Start and run winding causes ...? ...which is when the current in the start Winding is out of phase with the Run winding...

Locked Rotor Amperage

The current that a motor draws as power is first applied on Start-up is the...?

Frequency

The electronic device in an ECM control the speed of the motor by varying the ...? of the electrical signal.

Rotate

The interaction between the magnetic fields of the startor and the rotor causes the rotor to...?

Opposite

The magnetic field created in the rotor has a Polarity....? ... Polarity of the magnetic field in the stator windings.

Electromagnetic field

When current from a power source is applied to the field Winding,it creates a....?

Common, Starting, Running.

Which of the following are the three motor terminals found on a hermetic compressor...?

Three phase motor

A....? .... is an induction motor with set-up startor Winding powered by three- phase power.

True

Electric motors are rated at their operating speed under a full load.. is it true or false..?

Motor terminal box

Electrical connections are made in the......? to control and power the motor.

The condenser an evaporator

In which two parts of AN HVACR system are motor-driven fans typically used.?

Metal bars..... Page....252

Instead of coils of wire, a squirrel cage rotor has...? mounted on an iron core.

Rotor and stator

What are the two primary component of all electric motors..?

Motor terminal box. page..262

A three-phase motor can be wired for low voltage or high voltage by using jumpers wires to connect terminals in the ...?

More coil turns

A motor starts winding has a higher inductance value than the run winding, because it is made of..?

False

A stator capacitor is used in a stator run winding circuit... Is it true or false

Centrifical switch

A.(n).....? ....drop the start winding and Start capacitor out of the motor circuit after the motor starts running.

True

An electrical motor operates based on the principle of electricity and magnetism.. is it true or false..?

Alternating Current

As the Polarities of the startor Poles changes due to the flow of ....? The Polarity the rotor also change.

Shaded pole Page..261

As the voltage level decrease in a Shaded pole motor's field windings,the electromagnetic field become centered over the ..?

Permanent magnets

In an electronically commuted motor,the rotor is made of..?

Variable speed, compact design, durability, efficiency,

List four advantage of ecms.

Which of the following best explains the relationship between the rotor and the stator....page 252.

Magnetic field generated by the stator induced current in the rotor, which cause the rotor to generate its own magnetic field.

Counter (EMF)

Magnetic field generated in the rotor induce a voltage called ....? ...that has a Polarity opposite of Applied voltage Polarity

False

Mechanical energy produced by the motor shaft divided by the power input to the motor is referred to as the.... Is it true or false..?

False

Run winding are used for Motors starting with additional torque... is it true or false ?

Start winding

Start capacitor and run capacitors are added to the ....? Circuit of an induction motor for additional torque..