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Motors & Controls MCQ

Fitts' law states that __________ is linearly related to index of difficulty (id).

Width of the target

Amplitude of the movement

Reaction time

Movement time

Answer

Correct Answer: Movement time

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What is J?

Time in seconds to accelerate the motor armature to rated base speed using

Rated full load torque

The number of revolutions that occur in one minute

The time it takes for a wave to complete one cycle

Per unit moment of inertia

Answer

Correct Answer: Per unit moment of inertia

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What does J represent in the per unit moment of inertia?

Time in seconds to accelerate the motor armature to rated base speed

Load torque

Base speed

Inertia

Answer

Correct Answer: Time in seconds to accelerate the motor armature to rated base speed

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What is the name of the system that uses five specialized elements to insulate a motor?

Transmission System

Braking System

Insulation System

Caster System

Answer

Correct Answer: Insulation System

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What is the unit of Inertia?

Oz.-in.

Lb.-ft.2 or oz.-in.2

Ft.-lb.

Lb.-ft.

Answer

Correct Answer: Lb.-ft.2 or oz.-in.2

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In an induction motor, what is the primary winding connected to?

The stator

The power source

The rotor

The secondary winding

Answer

Correct Answer: The power source

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In an induction motor, there is no physical electrical connection to the _____.

Secondary winding

Primary winding

Power source

Squirrel-cage secondary winding

Answer

Correct Answer: Secondary winding

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What produces a varying magnetic field?

Varying current

Varying voltage

Alternating current

Direct current

Answer

Correct Answer: Varying current

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What is HYSTERESIS LOSS?

The energy expended to magnetize and demagnetize the core.

The resistance offered by materials to becoming magnetized.

The magnetic orientation of molecular structure.

The core of a magnetic circuit.

Answer

Correct Answer: The resistance offered by materials to becoming magnetized.

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What is the meaning of HERTZ?

One cycle per second

Half-cycles per minute

Cycles per hour

Two cycles per microsecond

Answer

Correct Answer: One cycle per second

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What is the purpose of a heat exchanger?

To transfer the heat from inside the motor to another medium

To transfer the heat from inside the motor to the outside

To cool the motor

To transfer the heat from outside the motor to another medium

Answer

Correct Answer: To transfer the heat from inside the motor to another medium

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What is the purpose of having a guarded motor?

To allow easy access to live or rotating parts

To prevent accidental contact with live or rotating parts

To allow ventilation of the motor

To protect the motor from the elements

Answer

Correct Answer: To prevent accidental contact with live or rotating parts

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What is a grounded motor?

A motor with an electrical connection between the motor frame and ground.

A motor with a power source but no electrical connection

A motor that is not operational

A motor that does not have a power source

Answer

Correct Answer: A motor with an electrical connection between the motor frame and ground.

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What is the NEMA design of a general-purpose motor?

"C"

"B"

"D"

"A"

Answer

Correct Answer: "B"

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What does NEMA stand for?

Northern Electrical Manufacturing Association

National Economic Manufacturers Association

National Electrical Manufacturers Association

National Environment Manufacturers Association

Answer

Correct Answer: National Electrical Manufacturers Association

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What is GEARMOTOR?

A device used to increase the speed of a motor

A gearhead and motor combination to reduce the speed of the motor to obtain the desired speed or torque.

A device used to increase the torque of a motor

A device used to decrease the speed of a motor

Answer

Correct Answer: A gearhead and motor combination to reduce the speed of the motor to obtain the desired speed or torque.

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What does a gearhead do?

Converts the basic motor speed to the rated output speed.

Doubles the motor speed

Halves the motor speed

Allows the motor to rotate in both directions

Answer

Correct Answer: Converts the basic motor speed to the rated output speed.

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What does the frame of an AC motor support?

The rotor parts

The frame is the magnetic coil

The frame determines the mounting dimensions

The stator parts

Answer

Correct Answer: The stator parts

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What is the range of rpm for a FHP motor?

Below 1000 rpm

1500-1600 rpm

Above 2000 rpm

1700-1800 rpm

Answer

Correct Answer: 1700-1800 rpm

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What is the usual RPM of a FHP motor?

1700-1800

2200-2400

1200-1400

3500-3700

Answer

Correct Answer: 1700-1800

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What is the advantage of form winding over random (mush) winding?

Form winding is more difficult to manufacture than random (mush) winding.

Form winding allows for better insulation on high voltage than does random (mush) winding.

Form winding is less expensive than random (mush) winding.

Form winding is more efficient than random (mush) winding.

Answer

Correct Answer: Form winding allows for better insulation on high voltage than does random (mush) winding.

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What is FORM FACTOR?

Theencouragement of King Louis XIV of France

The ratio of the root-mean square (rms) value of the current to the average (av) current

A large departure from unity form factor

A figure of merit which indicates how much rectified current departs from pure (non-pulsating) DC.

Answer

Correct Answer: A figure of merit which indicates how much rectified current departs from pure (non-pulsating) DC.

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What is the magnetic field called that is established around an energized conductor or permanent magnet?

Flux

Electricity

Convection

Magnetism

Answer

Correct Answer: Flux

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What is flux?

A measure of the strength of the magnetic field.

A representation of the magnetic field.

The flux lines creating a flux pattern between opposite poles.

The magnetic field which is established around an energized conductor or permanent magnet.

Answer

Correct Answer: The magnetic field which is established around an energized conductor or permanent magnet.

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What is the main purpose of FLANGE Mounting?

To prevent vibration

For extra support

For mounting equipment to the motor

For overhanging the motor on the driven machine

Answer

Correct Answer: For mounting equipment to the motor

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What is the main purpose of field weakening?

To reduce the current

To decrease the motor speed

To reduce the voltage

To increase the motor speed

Answer

Correct Answer: To increase the motor speed

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Why is resistance introduced in series with the shunt wound field of the DC motor?

To increase the strength of the magnetic field.

To reduce voltage and current, thereby increasing motor speed.

To decrease the strength of the magnetic field.

To increase voltage and current, thereby decreasing motor speed.

Answer

Correct Answer: To reduce voltage and current, thereby increasing motor speed.

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What does the term "field" refer to in a DC motor?

The magnetic field

The mechanically rotating member

The stationary (stator) member

The rotating (armature or rotor) member

Answer

Correct Answer: The stationary (stator) member

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Which of the following is NOT true about an explosion-proof enclosure?

The motors are listed with Underwriter's Laboratories.

The enclosure prevents the ignition or explosion of the gas or vapor.

The enclosure is constructed to withstand an explosion.

The enclosure is not totally enclosed.

Answer

Correct Answer: The enclosure is not totally enclosed.

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What is the primary purpose of an endshield?

To balance the load on the motor shaft.

To support the bearing and act as a protective guard to the electrical and rotating parts inside the motor.

To protect the rotor from damage.

ToIncrease the torque of the motor.

Answer

Correct Answer: To support the bearing and act as a protective guard to the electrical and rotating parts inside the motor.

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What are eddy currents?

A type of electrical transformer

Localized currents induced in an iron core by alternating magnetic flux

A measure of the strength of a magnet

A device used to measure currents

Answer

Correct Answer: Localized currents induced in an iron core by alternating magnetic flux

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What is the name given to a motor which has its winding structure completely coated with an insulating resin?

Encapsulated winding

Skeleton winding

Varnished winding

Insulated winding

Answer

Correct Answer: Encapsulated winding

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What does EMF stand for?

Energy making form

Electricity motion force

Every morning fan

Electromotive force

Answer

Correct Answer: Electromotive force

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What is electrical unbalance?

The difference in voltage levels between the three different phases

When the voltages of the three different phases are not exactly the same

A measure of how well the voltage is balanced between the three phases

The product of the voltage and current in a three-phase system

Answer

Correct Answer: When the voltages of the three different phases are not exactly the same

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What is the ratio of electrical inductance to armature resistance?

The number of turns of wire in the armature winding

The number of seconds it takes for a motor to come to full speed

The product of the armature resistance and the number of ampere-turns required to produce a given torque

The electrical time constant

Answer

Correct Answer: The electrical time constant

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What is the electrical time constant?

The ratio of electrical inductance to armature resistance.

The time it takes for a DC current to reach its maximum value

The amount of time it takes for an electrical charge to decay

The time it takes for an AC current to reach its maximum value

Answer

Correct Answer: The ratio of electrical inductance to armature resistance.

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How many electrical degrees are in one complete cycle?

360

1200

7200

Answer

Correct Answer: 360

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What is the minimum efficiency number for a motor with a nominal efficiency of 54.5%?

54.4%

54%

53.5%

54.6%

Answer

Correct Answer: 54%

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Which of the following is not a NEMA code?

Answer

Correct Answer: J

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Which is the most common NEMA design for AC motors?

Design C

Design B

Design A

Design D

Answer

Correct Answer: Design B

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What is a Dynamometer used for?

To generate electricity

To measure the speed of an object

To measure the output torque and speed of a motor

To measure the weight of an object

Answer

Correct Answer: To measure the output torque and speed of a motor

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What is the relationship between the operating and rest times called?

Rest cycle

Duty cycle

Operating cycle

Load cycle

Answer

Correct Answer: Duty cycle

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What are the voltages that some motors can operate on?

Multiples of four

The √2 of one

Multiples of two or the √3 of one another

The √3 of two

Answer

Correct Answer: Multiples of two or the √3 of one another

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What is the meaning of DEFINITE PURPOSE MOTOR?

A motor designed for use under special service conditions or for a particular type of application.

A motor designed to run at high speeds.

A motor designed to run at low speeds.

A motor designed for use in hazardous environments.

Answer

Correct Answer: A motor designed for use under special service conditions or for a particular type of application.

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What is a DC motor?

A motor using either generated or rectified DC power

A motor using either generated or rectified AC power

A motor using AC power

A motor using DC power

Answer

Correct Answer: A motor using either generated or rectified DC power

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Which of the following is not a type of Direct Current?

Varying

Discontinuous

Constant

Continuous

Answer

Correct Answer: Continuous

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What does DC stand for?

DIRECT CURRENT

Dual-Core

Dual Channel

Answer

Correct Answer: DIRECT CURRENT

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What is the "D" flange used for?

It is used for D-series frame sizes

Mounting the motor to gear boxes or bulkheads

It is a special end shield with untapped holes for bolts

It is used to connect motor leads

Answer

Correct Answer: Mounting the motor to gear boxes or bulkheads

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What is the purpose of a D flange?

To connect two pipes together

For mounting the motor to gear boxes or bulkheads

To provide support for a structure

To act as a barrier

Answer

Correct Answer: For mounting the motor to gear boxes or bulkheads

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What is thepurpose of a commutator in an electric motor?

The commutator changes the direction of the current in the armature coils

The commutator supplies current to the armature coils

The commutator increases the torque of the motor

The commutator reduces the size of the armature

Answer

Correct Answer: The commutator supplies current to the armature coils

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There are three types of capacitor motors. What is the third type?

Capacitor Start

Capacitor Split-Phase

Capacitor Run

Capacitor shaded-pole

Answer

Correct Answer: Capacitor Run

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What is the function of COIL in an electric motor?

To carry and produce the magnetic field

To provide the path of least resistance for current flow

To electromagnetically interact with the armature to produce torque

To connect the armature and field windings in series

Answer

Correct Answer: To carry and produce the magnetic field

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What is the function of the COIL in an electric motor?

Reduces friction in the motor

Carries and produces the magnetic field

Turns the shaft of the motor

Increases the speed of the motor

Answer

Correct Answer: Carries and produces the magnetic field

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What is the name of the device which causes the current to lead the voltage in time phase?

An inductor

A resistor

A capacitor

A dielectric

Answer

Correct Answer: A capacitor

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What is the peak of the current wave reached ahead of the voltage wave in an alternating-current circuit?

Resistor

Inductor

Capacitor

Transistor

Answer

Correct Answer: Capacitor

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What is cogging?

Rotation of a person on a swing

Rotation occurring in jerks or increments rather than smooth motion.

Rotation occurring in smooth motion

Rotation of planets around the sun

Answer

Correct Answer: Rotation occurring in jerks or increments rather than smooth motion.

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What is the canopy?

The umbrella for the motor

A protective cover that protects the motor from liquids or solids

The motor being mounted vertically

A liquid or solid

Answer

Correct Answer: A protective cover that protects the motor from liquids or solids

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What is the function of a canopy on a motor?

To reduce the noise emitted by the motor

To increase the aerodynamic efficiency of the motor

To protect it from liquids or solids that might drop onto the motor

To improve the cooling of the motor

Answer

Correct Answer: To protect it from liquids or solids that might drop onto the motor

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What is the definition of cogging?

A measure of how much torque is required to rotate a motor armature.

The interaction between the field coils and armature coils in a DC motor.

The tendency of a motor to slow down when overloaded.

Rotation occurring in jerks or increments rather than smooth motion.

Answer

Correct Answer: Rotation occurring in jerks or increments rather than smooth motion.

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What is the "C" flange used for?

Assault weapons

Electrical sockets

To mount close-coupled pumps and speed reducers

Doors

Answer

Correct Answer: To mount close-coupled pumps and speed reducers

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Which of the following is true about "C" Flange?

The "C" flange is a NEMA standard design.

The "C" flange is used with close-coupled pumps only.

The "C" flange is available only with feet.

The "C" flange is used to connect the pump on the motor.

Answer

Correct Answer: The "C" flange is a NEMA standard design.

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What does the Canadian Standards Association do?

Sets specific standards for products used in Canada

Produces standards for products used in the United States

Produces standards for products used in Canada

Produces standards for products used in Europe

Answer

Correct Answer: Produces standards for products used in Canada

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What is a clutch?

A mechanical device for engaging and disengaging a motor.

A type of fastener

A device for starting a car

A device for stopping a car

Answer

Correct Answer: A mechanical device for engaging and disengaging a motor.

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What is a centrifugal cutout switch?

A device that regulates the flow of electricity in a circuit.

A centrifugally operated automatic mechanism used in conjunction with split phase and other types of single-phase induction motors.

A device used to connect or disconnect the starting winding of an induction motor.

A device that increases the voltage in an electrical circuit.

Answer

Correct Answer: A centrifugally operated automatic mechanism used in conjunction with split phase and other types of single-phase induction motors.

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What is CIV?

Continuous Inverter Voltage

Corona Inception Voltage

Corona Injection Voltage

Converter Inverter Voltage

Answer

Correct Answer: Corona Inception Voltage

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What is the minimum voltage amount that begins the process of ionization of motor windings?

CIV

Process of Ionization

Corona Inception Voltage

Minimum Voltage Amount

Answer

Correct Answer: CIV

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What does CE stand for?

Economic Cooperation

Environmentally Conscious

Equal Chance

European Standards

Answer

Correct Answer: European Standards

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What does the CE designation show for a product?

That it is a limited edition product.

That it was made in the CE () century.

That it meets European Standards for safety and environmental protection.

That it is only available in Europe

Answer

Correct Answer: That it meets European Standards for safety and environmental protection.

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What is the main difference between the capacitor start single-phase motor and the split phase start motor?

The capacitor start single-phase motor has a capacitor in series with the running winding.

The capacitor start single-phase motor has a capacitor in parallel with the starting winding.

The capacitor start single-phase motor has a capacitor in series with the starting winding.

The capacitor start single-phase motor does not have a capacitor in series with the starting winding.

Answer

Correct Answer: The capacitor start single-phase motor has a capacitor in series with the starting winding.

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What does the capacitor do in a capacitor start motor?

Provide better phase relation

Give the motor a split-phase start

Reverse the motor at rest

Provide more power input

Answer

Correct Answer: Provide better phase relation

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What is the torque required to bring a motor down to a standstill called?

Brake torque

Running torque

Holding torque

Breaking torque

Answer

Correct Answer: Breaking torque

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What is the purpose of a brush in a commutated motor?

Provide lubrication for the armature

Regulate the speed of the motor

Increase the torque of the motor

Conduct current from the power supply to the armature windings

Answer

Correct Answer: Conduct current from the power supply to the armature windings

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What is the maximum torque a motor will develop at rated voltage without a relatively abrupt drop or loss in speed?

Torque

Maximum torque

Loss in speed

Breakdown torque

Answer

Correct Answer: Breakdown torque

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What is the definition of BREAKDOWN TORQUE?

The maximum torque a motor will develop at rated voltage without a relatively abrupt drop or loss in speed.

The minimum torque a motor will develop at rated voltage without a relatively abrupt drop or loss in speed.

Answer

Correct Answer: The maximum torque a motor will develop at rated voltage without a relatively abrupt drop or loss in speed.

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What is the braking torque?

The torque required to Accelerate a motor

The torque required to bring a motor down to a standstill.

The torque required to start a motor.

The torque required to keep a motor running.

Answer

Correct Answer: The torque required to bring a motor down to a standstill.

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What is the purpose of brakes?

To bring a running motor to a standstill and/or hold a load.

To start a motor

To increase the speed of a motor

To make a motor run more smoothly

Answer

Correct Answer: To bring a running motor to a standstill and/or hold a load.

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BEARING LIFE rating is the life in hours or revolutions in which:

10% of the bearings selected will obtain or exceed.

100% of the bearings selected will obtain or exceed.

50% of the bearings selected will obtain or exceed.

90% of the bearings selected will obtain or exceed.

Answer

Correct Answer: 90% of the bearings selected will obtain or exceed.

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What is the main purpose of Bearings?

Reduce friction and wear while supporting rotating elements

Provide a relatively rigid support for the output shaft

Support the output shaft

Connect the rotating and stationary elements of a motor

Answer

Correct Answer: Reduce friction and wear while supporting rotating elements

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What are bearings used for?

To provide a rigid support for the output shaft

To act as the connection point between the rotating and stationary elements of a motor

To reduce friction and wear while supporting rotating elements

To increase friction and wear while supporting rotating elements

Answer

Correct Answer: To reduce friction and wear while supporting rotating elements

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What does BASE SPEED, RPM stand for?

Base Speed, Religious People per Minute

Base Speed, Roman Catholics per Minute

Base Speed, Revolutions per Minute

Base Speed, Republicans per Minute

Answer

Correct Answer: Base Speed, Revolutions per Minute

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What is the back end of a motor also called?

The end that carries the alternator

The end that carries the gearbox

The end that carries the engine

The end that carries the coupling or driving pulley

Answer

Correct Answer: The end that carries the coupling or driving pulley

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What is the back end of a motor?

The back end of a motor is the end that contains the brakes.

The back end of a motor is the end that houses the transmission.

The back end of a motor is the end that contains the engine.

The back end of a motor is the end that carries the coupling or driving pulley.

Answer

Correct Answer: The back end of a motor is the end that carries the coupling or driving pulley.

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What does ARMATURE CURRENT mean?

Full load armature circuit current.

Voltage produced by an armature coil.

Current that flows through the armature.

A device used to create armature current.

Answer

Correct Answer: Full load armature circuit current.

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What is the purpose of an armature in a DC or universal motor?

The armature is stationary and allows electrons to flow through the motor

The armature increases the speed of the motor

The armature rotates and creates magnetic flux

The armature is made of rare earth metals and improves the motor's efficiency

Answer

Correct Answer: The armature rotates and creates magnetic flux

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What does the term "Armature" refer to in the context of a DC or universal motor?

The power supply of the motor.

The speed controller of the motor.

The portion of the magnetic structure which does not rotate.

The portion of the magnetic structure which rotates.

Answer

Correct Answer: The portion of the magnetic structure which rotates.

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What is an anti-friction bearing?

A bearing that uses liquid lubrication

A type of roller bearing

A bearing utilizing rolling elements between the stationary and rotating assemblies

A device that reduces friction between two surfaces

Answer

Correct Answer: A bearing utilizing rolling elements between the stationary and rotating assemblies

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What is the standard NEMA rating for ambient temperature?

Not to exceed 30 degrees C

Not to exceed 40 degrees C

Should be between 10-15 degrees C

Not to exceed 60 degrees C

Answer

Correct Answer: Not to exceed 40 degrees C

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What is the maximum altitude at which a NEMA standard motor can operate?

3,000 meters (9,850 feet)

1,000 meters (3,300 feet)

2,000 meters (6,600 feet)

500 meters (1,650 feet)

Answer

Correct Answer: 1,000 meters (3,300 feet)

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What does an air temperature switch do?

It turns the motor on and off

It detects the temperature of the surrounding air

It detects the temperature of the exhausted air

It cools the motor

Answer

Correct Answer: It detects the temperature of the exhausted air

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What does an air pressure switch do?

Detects a clogged filter

Used on motors with blowers to measure the difference in pressure across the filter

To detect a change in pressure

To measure the pressure of the air

Answer

Correct Answer: Detects a clogged filter

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How is the amount of steel in a motor's stator and rotor increased or decreased?

By increasing or decreasing the magnetic field around the rotor and stator

By adding or removing iron from the rotor and stator

By lengthening or shortening the rotor and stator

By changing the direction of the current through the rotor and stator

Answer

Correct Answer: By lengthening or shortening the rotor and stator

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How is the amount of active iron in a motor usually increased or decreased?

By lengthening or shortening the stator.

By increasing or decreasing the width of the rotor and stator.

By increasing or decreasing the length of the rotor and stator.

By lengthening or shortening the rotor and stator.

Answer

Correct Answer: By lengthening or shortening the rotor and stator.

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What is the force or load that is applied to the motor shaft in a direction parallel to the axis of the shaft called?

Horsepower

Angular momentum

Axial thrust

Torque

Answer

Correct Answer: Axial thrust

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What does ARMATURE RESISTANCE mean?

The flux in the armature winding of a DC machine.

AC against DC

The resistance of the armature winding of a DC machine.

The current in the armature winding of a DC machine

Answer

Correct Answer: The resistance of the armature winding of a DC machine.

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What is armature resistance measured in?

Volts

Amps

Watts

Ohms

Answer

Correct Answer: Ohms

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What is the name of the effect that reduces the torque capacity of a DC motor?

Armature Reaction

Electromagnetic induction

Eddy current

Faraday's law of induction

Answer

Correct Answer: Armature Reaction

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What is armature resistance?

The measure of armature resistance in ohms at 0 degrees C (cold)

The measure of armature resistance in ohms at 25 degrees C (cold)

The measure of armature resistance in amperes at 25 degrees C (cold)

The measure of armature resistance in volts at 25 degrees C (cold)

Answer

Correct Answer: The measure of armature resistance in ohms at 25 degrees C (cold)

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What is the unit of measurement for armature resistance?

Henry

Ohms

Volt

Ampere

Answer

Correct Answer: Ohms

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What is the name of the current that flows in the armature winding of a DC motor?

Field current

Armature current

Motor current

Commutation current

Answer

Correct Answer: Armature current

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What does ARMATURE INDUCTANCE, MH refer to?

Speed of armature

Armature inductance in milli-henries (saturated)

Current armature

Width of armature

Answer

Correct Answer: Armature inductance in milli-henries (saturated)

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What does ARMATURE INDUCTANCE, MH stand for?

Angular momentum in henries per meter

Armature inductance in milli-henries (saturated).

Area of magnetic field in henries per meter

Amplitude modulation in henries per meter

Answer

Correct Answer: Armature inductance in milli-henries (saturated).

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What is an AC Motor?

A motor operating on AC current that only flows in one direction

A motor operating on AC current that flows in either direction

A motor operating on DC current that flows in either direction

A motor operating on DC current that only flows in one direction

Answer

Correct Answer: A motor operating on AC current that flows in either direction

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How many times does AC current change its direction per second?

Answer

Correct Answer: 60

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How many times does AC current change its direction of flow in a day?

It changes direction 72 times in a day.

It cycles

It changes direction 48 times in a day

It changes direction 24 times in a day

Answer

Correct Answer: It cycles

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More Applied Engineering Subjects

Advanced Electrical/Mechanical Systems

Applied Mechanics

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Circuits

Design & Analysis of Control Systems

Electrical Systems

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Engineering Economic Analysis

Engineering Materials and Processes

Foundations of Engineering

General Chemistry

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