856448
Descripción
Test por Vito Martino, actualizado hace más de 1 año
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Creado por Vito Martino
hace más de 10 años
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Pregunta 1
Pregunta
The magnetic field created when a current passes through a coil can be reversed by
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adding capacitance
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increasing the frequency
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reversing the current
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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
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50 V
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500 V
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5 V
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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
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1.8 V
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1800 V
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18 V
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180 V
Pregunta 4
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above the solenoid
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at the left of the solenoid
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at the right of the solenoid
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below the solenoid
Pregunta 5
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below the solenoid
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at the right of the solenoid
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at the left of the solenoid
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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
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300 V
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33 V
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3 V
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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
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200 V
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22 V
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20 V
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2 V
Pregunta 8
Pregunta
Which of the following would be the approximate peak value for a supply of 150V rms
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212 V
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106 V
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235 V
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95 V
Pregunta 9
Pregunta
Which of the following would be the approximate rms value for a peak supply of 180 V
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115 V
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255 V
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127 V
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282 V
Pregunta 10
Pregunta
Which of the following would be the frequency for a time period of 50 milli-seconds
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25 Hz
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20 Hz
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50 Hz
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40 Hz
Pregunta 11
Pregunta
Which of the following would be the frequency for a time period of 10 milli-seconds
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10 Hz
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200 Hz
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50 Hz
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100 Hz
Pregunta 12
Pregunta
Which of the following would be the frequency for a time period of 25 milli-seconds
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40 Hz
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50 Hz
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20 Hz
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25 Hz
Pregunta 13
Pregunta
which of the following is the time taken for one cycle of a 400Hz supply
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5 mS
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250 mS
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2.5 mS
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25 mS
Pregunta 14
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the peak amplitude
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the peak to peak amplitude
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the frequency
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the time period
Pregunta 15
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the peak amplitude
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the peak to peak amplitude
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the frequency
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the time period
Pregunta 16
Pregunta
If the frequency of supply is 1.5kHz, the periodic time is
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0.66ms
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66ms
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660s
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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?
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11v
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1.5v
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3v
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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?
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15v
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60v
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12v
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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?
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15v
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100v
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166v
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60v
Pregunta 20
Pregunta
If a supply voltage has a value of 240V the r.m.s value is
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240V
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255V
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260V
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170V
Pregunta 21
Pregunta
Outside a bar magnet the magnetic field goes from
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South to south
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North to north
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South to north
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North to south
Pregunta 22
Pregunta
An AC sine wave has a maximum value:
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One per cycle
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Twice per cycle
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Three times per cycle
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Never per cycle
Pregunta 23
Pregunta
From the diagram below the direction of current is said to be
Image:
Slide4.JPG (image/JPG)
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Flowing from A to B
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Flowing from B to A
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Flowing up and down
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In a waveform formation
Pregunta 24
Pregunta
To calculate the average value of a sine wave the following multiplier should be used?
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0.543
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0.89
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0.707
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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?
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0.637
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0.2
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0.88
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0.7071
Pregunta 26
Pregunta
What principle would we apply to find the magnetic north pole in this solenoid?
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Right Hand Grip Rule
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Flemings Right Hand Rule
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Flemings Left Hand Rule
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Lenz Law
Pregunta 27
Pregunta
What would be the effect of the two conductors that have the current flowing in the direction shown?
Image:
Slide5.JPG (image/JPG)
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The magnetic fields will allow for a resonance to occur and produce sound waves to communicate with other conductors
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The magnetic field would flow and produce a resistance which will oppose the capacitance of an inductor
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The magnetic field would become strong in between the conductors repelling the conductors away
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The magnetic field would strengthen and produce a larger magnetic field around both conductors
Pregunta 28
Pregunta
Which of the following is correct?
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All magnets have five poles
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All magnets have three poles
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All magnets have one pole
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All magnets have two poles
Pregunta 29
Pregunta
Which of the following numbers would measure the peak to peak voltage?
Image:
Slide6.JPG (image/JPG)
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2 and 3
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1 and 3
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3 and 4
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1 and 2
Pregunta 30
Pregunta
Which of the following numbers would measure the periodic time?
Image:
Slide6.JPG (image/JPG)
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2 to 4
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1 only
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2 to 3
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1 to 4
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