Principles of electromagnetism

Descripción

2 Electrical Science Test sobre Principles of electromagnetism, creado por Vito Martino el 10/05/2014.
Vito Martino
Test por Vito Martino, actualizado hace más de 1 año
Vito Martino
Creado por Vito Martino hace casi 10 años
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Resumen del Recurso

Pregunta 1

Pregunta
The magnetic field created when a current passes through a coil can be reversed by
Respuesta
  • adding capacitance
  • increasing the frequency
  • reversing the current
  • increasing the number of turns

Pregunta 2

Pregunta
What value of EMF would be induced from an alternator with a conductor of 50cm rotating at a velocity of 20m/s within a magnetic flux density of 5 Tesla
Respuesta
  • 50 V
  • 500 V
  • 5 V
  • 5000 V

Pregunta 3

Pregunta
What value of EMF would be induced from an alternator with a conductor of 0.3m rotating at a velocity of 30m/s within a magnetic flux density of 2 Tesla
Respuesta
  • 1.8 V
  • 1800 V
  • 18 V
  • 180 V

Pregunta 4

Pregunta
For the direction of current shown the north pole is
Respuesta
  • above the solenoid
  • at the left of the solenoid
  • at the right of the solenoid
  • below the solenoid

Pregunta 5

Pregunta
Identify from the solenoid the position of the north pole
Respuesta
  • below the solenoid
  • at the right of the solenoid
  • at the left of the solenoid
  • above the solenoid

Pregunta 6

Pregunta
What value of EMF would be induced from an alternator with a conductor of 40cm rotating at a velocity of 25m/s within a magnetic flux density of 3 Tesla
Respuesta
  • 300 V
  • 33 V
  • 3 V
  • 30 V

Pregunta 7

Pregunta
What value of EMF would be induced from an alternator with a conductor of 250mm rotating at a velocity of 20m/s within a magnetic flux density of 4 Tesla
Respuesta
  • 200 V
  • 22 V
  • 20 V
  • 2 V

Pregunta 8

Pregunta
Which of the following would be the approximate peak value for a supply of 150V rms
Respuesta
  • 212 V
  • 106 V
  • 235 V
  • 95 V

Pregunta 9

Pregunta
Which of the following would be the approximate rms value for a peak supply of 180 V
Respuesta
  • 115 V
  • 255 V
  • 127 V
  • 282 V

Pregunta 10

Pregunta
Which of the following would be the frequency for a time period of 50 milli-seconds
Respuesta
  • 25 Hz
  • 20 Hz
  • 50 Hz
  • 40 Hz

Pregunta 11

Pregunta
Which of the following would be the frequency for a time period of 10 milli-seconds
Respuesta
  • 10 Hz
  • 200 Hz
  • 50 Hz
  • 100 Hz

Pregunta 12

Pregunta
Which of the following would be the frequency for a time period of 25 milli-seconds
Respuesta
  • 40 Hz
  • 50 Hz
  • 20 Hz
  • 25 Hz

Pregunta 13

Pregunta
which of the following is the time taken for one cycle of a 400Hz supply
Respuesta
  • 5 mS
  • 250 mS
  • 2.5 mS
  • 25 mS

Pregunta 14

Pregunta
According to the diagram below y represents
Respuesta
  • the peak amplitude
  • the peak to peak amplitude
  • the frequency
  • the time period

Pregunta 15

Pregunta
According to the diagram above X represents
Respuesta
  • the peak amplitude
  • the peak to peak amplitude
  • the frequency
  • the time period

Pregunta 16

Pregunta
If the frequency of supply is 1.5kHz, the periodic time is
Respuesta
  • 0.66ms
  • 66ms
  • 660s
  • 0.00006s

Pregunta 17

Pregunta
If a 0.2m conductor moves at right angles with a velocity of 15m/s though a magnetic flux density of 3T, what is the induced voltage?
Respuesta
  • 11v
  • 1.5v
  • 3v
  • 9v

Pregunta 18

Pregunta
If a 40cm conductor moves at right angles with a velocity of 10m/s though a magnetic flux density of 1.5T, what is the induced voltage?
Respuesta
  • 15v
  • 60v
  • 12v
  • 6v

Pregunta 19

Pregunta
If a 60cm conductor moves at right angles with a velocity of 50m/s though a magnetic flux density of 2T, what is the induced voltage?
Respuesta
  • 15v
  • 100v
  • 166v
  • 60v

Pregunta 20

Pregunta
If a supply voltage has a value of 240V the r.m.s value is
Respuesta
  • 240V
  • 255V
  • 260V
  • 170V

Pregunta 21

Pregunta
Outside a bar magnet the magnetic field goes from
Respuesta
  • South to south
  • North to north
  • South to north
  • North to south

Pregunta 22

Pregunta
An AC sine wave has a maximum value:
Respuesta
  • One per cycle
  • Twice per cycle
  • Three times per cycle
  • Never per cycle

Pregunta 23

Pregunta
From the diagram below the direction of current is said to be
Respuesta
  • Flowing from A to B
  • Flowing from B to A
  • Flowing up and down
  • In a waveform formation

Pregunta 24

Pregunta
To calculate the average value of a sine wave the following multiplier should be used?
Respuesta
  • 0.543
  • 0.89
  • 0.707
  • 0.637

Pregunta 25

Pregunta
To calculate the root-mean-square r.m.s value of a sine wave the following multiplier should be used?
Respuesta
  • 0.637
  • 0.2
  • 0.88
  • 0.7071

Pregunta 26

Pregunta
What principle would we apply to find the magnetic north pole in this solenoid?
Respuesta
  • Right Hand Grip Rule
  • Flemings Right Hand Rule
  • Flemings Left Hand Rule
  • Lenz Law

Pregunta 27

Pregunta
What would be the effect of the two conductors that have the current flowing in the direction shown?
Respuesta
  • The magnetic fields will allow for a resonance to occur and produce sound waves to communicate with other conductors
  • The magnetic field would flow and produce a resistance which will oppose the capacitance of an inductor
  • The magnetic field would become strong in between the conductors repelling the conductors away
  • The magnetic field would strengthen and produce a larger magnetic field around both conductors

Pregunta 28

Pregunta
Which of the following is correct?
Respuesta
  • All magnets have five poles
  • All magnets have three poles
  • All magnets have one pole
  • All magnets have two poles

Pregunta 29

Pregunta
Which of the following numbers would measure the peak to peak voltage?
Respuesta
  • 2 and 3
  • 1 and 3
  • 3 and 4
  • 1 and 2

Pregunta 30

Pregunta
Which of the following numbers would measure the periodic time?
Respuesta
  • 2 to 4
  • 1 only
  • 2 to 3
  • 1 to 4
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