100% tevredenheidsgarantie Direct beschikbaar na je betaling Lees online óf als PDF Geen vaste maandelijkse kosten
logo-home
Eerder door jou gezocht
Eerder door jou gezocht
logo
NCCER Electrical Level 2 Module 2 Motors: Theory and Application Questions and Answers $12.49
In winkelwagen
Snel navigeren naar
Voorbeeld
  2.  
  3. NCCER Electrical Level 2 Module 2 Motors: Theory A
  4.  
  5. NCCER Electrical Level 2 Module 2 Motors: Theory a

Tentamen (uitwerkingen)

NCCER Electrical Level 2 Module 2 Motors: Theory and Application Questions and Answers
 1 keer verkocht
  • Vak
  • NCCER Electrical Level 2 Module 2 Motors: Theory a
  • Instelling
  • NCCER Electrical Level 2 Module 2 Motors: Theory A

NCCER Electrical Level 2 Module 2 Motors: Theory and Application How DC motors operate? - Answer- Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force do not cross. Armature - Answer- The rotating windings of a DC motor. Commutator - Answer- A device...

[Meer zien]

Voorbeeld 2 van de 6  pagina's

Document informatie

  • 12 september 2024
  • 6
  • 2024/2025
  • Tentamen (uitwerkingen)
  • Vragen en antwoorden

Onderwerpen

Geschreven voor

  • NCCER Electrical Level 2 Module 2 Motors: Theory a
  • NCCER Electrical Level 2 Module 2 Motors: Theory a

Verkoper

avatar-seller
Freshy

Ontvangen beoordelingen

Voorbeeld van de inhoud

NCCER Electrical Level 2 Module 2
Motors: Theory and Application
How DC motors operate? - Answer- Magnetic lines of force are continuous and
always form closed loops; Magnetic lines of force do not cross.

Armature - Answer- The rotating windings of a DC motor.

Commutator - Answer- A device used on electric motors or generators to maintain a
unidirectional current.

Torque - Answer- _____ is produced by mounting a loop in a fixed magnetic field
and as long as the fields of the magnet and armature interact.

horsepower - Answer- The rated output capacity of the motor. It is based on
breakdown torque, which is the maximum torque a motor will develop without an
abrupt drop in speed.

magnetic field - Answer- A _____ is produced by the fields poles, and a loop of wire
in the armature turns and cuts this magnetic field.

Horsepower: (Equation) - Answer- Watts/746

Types of DC motors - Answer- Shunt
Series
Compound

Types of AC motors - Answer- Synchronous and Induction (Single and Polyphase)

Periodic duty: (Definition) - Answer- Intermittent operation at a substantially constant
load for a short and definitely specified time.

Revolutions per minute (rpm) - Answer- The approximate full-load speed at the rated
power line frequency. The speed of a motor is determined by the number of poles in
the winding.

Rotation - Answer- For single-phase motors, the standard rotation, unless otherwise
noted, is counterclockwise facing the lead or opposite shaft end. All motors can be
reconnected at the terminal board for opposite rotation unless other wise indicated.

Synchronous speed - Answer- The speed of the revolving field of the stator, which is
dependent on the supply frequency and number of poles in a stator winding.

Field poles - Answer- The stationary portion of a DC motor that produces the
magnetic field.

, The principle reason for developing the brushless DC motor was to ___. - Answer-
eliminate commutator problems

The electrical energy required to produce 1hp of mechanical energy is _____. -
Answer- 746W

When there is a wide variation in both torque and speed requirements, such as a
blower or hoist, use a _____. - Answer- series DC motor

The name of the stationary motor part that produces the magnetic field during
operation is the ____. - Answer- stator

The rpm of a 60Hz motor with two poles is ___. - Answer- 3,600rpm

In three-phase motors, the rotor most commonly used is the _____. - Answer-
squirrel cage rotor

The starting torque characteristics of a wound-rotor motor are defined by _____. -
Answer- rotor resistance

A three-phase synchronous motor is started with a(n) _____. - Answer- amortisseur
winding

The speed of an induction motor depends on the power supply frequency and the
___. - Answer- numbers of poles

The speed on a multiple-winding motor is normally changed by ____. - Answer-
switching contacts in the motor controller

A consequent-pole motor has _____. - Answer- two speeds

The method of braking in which DC is applied to the motor windings after AC is
removed is known as ____. - Answer- injection braking

Reconnecting a running motor to act as a generator is known as ____. - Answer-
dynamic braking

An insulation resistance test can be used to determine _____. - Answer- whether a
motor is damp

A motor with the field coils connected in parallel with the rotor winding is a _____. -
Answer- shunt motor

The type of motor most likely to be used in a location with flammable dust and torque
fluctuations is a ____. - Answer- squirrel cage induction motor

A type of motor used in precision applications that require constant speed with zero
slip is a _____. - Answer- synchronous motor

Dit zijn jouw voordelen als je samenvattingen koopt bij Stuvia:

Bewezen kwaliteit door reviews

Bewezen kwaliteit door reviews

Studenten hebben al meer dan 850.000 samenvattingen beoordeeld. Zo weet jij zeker dat je de beste keuze maakt!

In een paar klikken geregeld

In een paar klikken geregeld

Geen gedoe — betaal gewoon eenmalig met iDeal, creditcard of je Stuvia-tegoed en je bent klaar. Geen abonnement nodig.

Direct to-the-point

Direct to-the-point

Studenten maken samenvattingen voor studenten. Dat betekent: actuele inhoud waar jij écht wat aan hebt. Geen overbodige details!

Veelgestelde vragen

Wat krijg ik als ik dit document koop?

Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.

Tevredenheidsgarantie: hoe werkt dat?

Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.

Van wie koop ik deze samenvatting?

Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper Freshy. Stuvia faciliteert de betaling aan de verkoper.

Zit ik meteen vast aan een abonnement?

Nee, je koopt alleen deze samenvatting voor $12.49. Je zit daarna nergens aan vast.

Is Stuvia te vertrouwen?

4,6 sterren op Google & Trustpilot (+1000 reviews)

Afgelopen 30 dagen zijn er 63950 samenvattingen verkocht

Opgericht in 2010, al 15 jaar dé plek om samenvattingen te kopen

Begin nu gratis

Laatst bekeken door jou

Tentamen (uitwerkingen) ·

(0)

NUR 4590 Exam 1: Professional Identity of the Nurse Leader (Latest 2023-2024) – Rasmussen.

Tentamen (uitwerkingen) ·

(0)

WGU C273 INTRODUCTION TO SOCIOLOGY - RETAKE EXAM 2023/2024 UPDATED (QUESTIONS AND ANSWERS)

Tentamen (uitwerkingen) ·

(0)

ETHC-445: | ETHC 445 PRINCIPLES OF ETHICS TEST {2} QUESTIONS WITH CORRECT ANSWERS | GRADED A+

Tentamen (uitwerkingen) ·

(0)

HRM 324 Individual Retirement Plan QUESTIONS AND ANSWERS 100% CORRECTLY ANSWERED

Overig ·

(0)

HIST 405N Week 7 Case Study; Option 3; American Domestic and Foreign Policies (1953-1991)

Tentamen (uitwerkingen) ·

(0)

Test Bank for Essentials of Nursing Leadership and Management 7th Edition Weiss

Voordeelbundel ·

(0)

Package deal for History of Animation Scholar Exam with Questions and Answers

Tentamen (uitwerkingen) ·

(0)

Mesa Airlines GOM Study Guide Questions and Answers 2023 with complete solution

Tentamen (uitwerkingen) ·

(0)

NR 508 Week 5 Quiz / NR508 Week 5 Quiz : Chamberlain College of Nursing (2020/21, All Correct)
$12.49  1x  verkocht
  • (0)
In winkelwagen
Toegevoegd