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DC ASIM > FINALS QUESTIONNAIRES > Flashcards

FINALS QUESTIONNAIRES Flashcards

1
Q

What part of DC Generator acts as a rectifier?

A

Commutator

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2
Q

Is a rotating machine that supplies an electrical output with unidirectional voltage and current?

A

DC Generator

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3
Q

Losses which occur because of friction between the parts of the generator.

A

Mechanical Losses

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4
Q

These are the generators whose field magnets are energized by some external DC Source, such as a battery.

A

Separately Excited DC Generator

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5
Q

A form of two-layer winding for electric machines in which each coils is connected in series with one adjacent to it.

A

Lap Winding

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6
Q

Its main function is to supply magnetic fields around which the coil spin.

A

Stator

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7
Q

The field winding of this generator is connected in parallel with the generator armature.

A

Shunt Wound Generators

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8
Q

Is a mechanical piece in a DC machine that produces the rotational of a force known as torque and brings about rotation.

A

Shaft

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9
Q

It is made up of soft iron laminations which are insulated from each other and tightly clamped
together

A

Armature Core

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10
Q

These generators are generators whose field magnets are energized by the current supplied by themselves

A

Self Excited DC Generator

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11
Q

His armature consists of an iron ring with projecting teeth interspeed with coils which formed a closed series circuit with connections to a commutator.

A

Antonio Pacinotti

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12
Q

The.__________, component must be properly adjusted to what is called “neutral” position

A

Yoke

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13
Q

For a cumulatively compound motor, torque at starting is greater than a ________?

A

Shunt Motor

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14
Q

It has linear relationship existing between the field current and the amount of torque produced.

A

Series Wound Motors

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15
Q

It is used to create mechanical revolutions and includes all the rotating electrical parts.

A

Rotor

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16
Q

This type of DC motor has good regulation and it is also classified as a constant speed motor even though its speed does decreases slightly with an increase in load.

A

Shunt Motor

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17
Q

Which type of DC motor has the same speed control techniques available as those available for a shunt motor? (scroll down for choices)

A. Cumulatively compounded DC motor

B. Differentially compounded DC motor

C. Both A and B but since B is almost never used, that fact hardly matters.

D. Neither A and B because each type of DC motor has a unique formulation.

A

C. Both A and B but since B is almost never used, that fact hardly matters.

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18
Q

Type of self excited de motor in which the field windings are exposed to the entire terminal voltage as they are connected in parallel to the armature winding.

A

Shunt Wound DC Motor

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19
Q

This type of permanent magnets are susceptible to high temperatures and become demagnetised. It can last over a 10 year period the loss in magnetic power would be un-noticeable.

A

Rare-earth Magnets

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20
Q

Using Fleming’s Left Hand Rule, we can determine three parameters which are:

A. Magnetic Force
B. Direction of Current
C. Magnetic Field
D. All of the above

A

D. All of the above

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21
Q

A transformer cannot be connected to the _______ because it will produce a steady current.

A

DC Supply

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22
Q

Simply the generation of an induced EMF in a coil as a result of current flowing in an adjacent coil.

A

Electromagnetism

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23
Q

At which category (Type) of transformer does a Distribution Transformer fall into

A

Step Down Transformer

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24
Q

_____________ type of transformer which operates on single-phase power.

A

Single Phase Transformer

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25
Q

Transformer’s work on which principle/law?

A

Faraday’s law of mutual induction

26
Q

In calculating efficiency transformer what is the value of Pc?

A

I1^2R1+I2^2Ro2

27
Q

What is the formula to get transformers EMF?

A

EMF=4.44FNØm

28
Q

Use of __________ transformer system (a series system) in the first large exposition of AC power in Turin, Italy.

A

Lucien Gaulard’s

29
Q

Lucien Gaulard and John Dixon Gibbs first built a _______ or in today’s terminology a step down transformer which they designed with open iron core, the invention was not very efficient to produce.

A

Secondary Generator

30
Q

________________ type of transformers that are used to change voltage of electrical systems with three-phase.

A

Three Phase Transformer

31
Q

“Father of three-phase current”

A

Galileo Ferraris

32
Q

They had worked on motor, but it had a commutator.

A

Stanley and Thomson

33
Q

An important year for AC power.

A

1886

34
Q

In 1886 designs an improved version of the Siemens single phase alternator

A

William Stanley

35
Q

When did Charles Proteus Steinmetz publishes introduces new mathematic solutions to solve puzzles of the behavior of AC power with his article: “Note on the Law of Hysteresis” in Electrical Engineer issue number 137.

A

December 17, 1890

36
Q

is a kind of electric generator used in contemporary cars to run the electrical system while the engine is running and to charge the battery.

A

Automotive Alternators

37
Q

These generators are taken two at a time and run sequentially with a 120 degrees offset between them.

A

Three-Phase AC Generator

38
Q

The function of an
________________________ is to provide a steady stream of electrical energy
to power all electrical devices and components within a machine

A

Alternator

39
Q

is used to convert current from alternating current (AC) to direct current (DC) during the charging process.

A

Rectifier

40
Q

is a machine that converts the MECHANICAL ENERGY into AC ELECTRICAL POWER.

A

AC Generator

41
Q

The stator is the stationary part of the motor’s electromagnetic circuit and is made up of thin metal sheets, called laminations.

A

Stator Core

42
Q

is a 1-phase motor that includes a stator as well as a rotor with a single cage.

A

Capacitor Start Induction Motor

43
Q

As the rotor coils are short-circuited, according to _______________, the current will start flowing through the coil of the rotor.

A

Faraday’s law of electromagnetic induction

44
Q

Coils of insulated wire are inserted into slots of the stator core

A

Stator Winding

45
Q

is a part of the motor used for the protection of the motor from the environment and persons from being touch.

A

Enclosure

46
Q

An alternate name of ____________ is a Resistance Start Motor

A

Split-Phase Induction Motor

47
Q

Conceives the idea of the first polyphase AC motor.

A

Galileo Ferraris

48
Q

Builds his first transformer and motor to work with his 3 phase AC system.

A

Dobrovolsky

49
Q

A _________________ gets produced in the stator due to the flow of current in the coil..

A

Magnetic Flux

50
Q

It is mounted on the shaft, support the rotor and allow it to turn.

A

Bearings

51
Q

Synchronous motors are generally not self-starting because…

A

…the direction of instantaneous torque reverses after half cycle

52
Q

A synchronous motor can develop synchronous torque…

A

…only at synchronous speed

53
Q

Synchronous motor always run at…

A

…the synchronous speed.

54
Q

Synchronous motor are…

A. not- self starting
B. Self-starting
C. Essentially self-starting
D. None of the above

A

A. not- self starting

55
Q

In a synchronous motor, which loss varies with load?

A

Copper loss

56
Q

the rotor copper losses, in a synchronous motor, are met by…

A

…DC Source.

57
Q

In which of the following motors the stator and the rotor magnetic field rotate at the same speed?

A. Universal Motor
B. Synchronous motor
C. reluctance motor
D. Induction motor

A

B. Synchronous motor

58
Q

Is the rotor loss being relatively smaller than stator loss due to the small DC rotor current flowing through the field winding?

A

Rotor Loss

59
Q

Is made of silicon steel material. It provides an easy path for the magnetic lines of force and accommodates the stator winding

A

Stator Core

60
Q

It is a type of losses that occur in the core or the iron parts of the synchronous motor due to the magnetic property of the material.

A

Iron and Core Losses

DC ASIM (2 decks)

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