# Principles of electromagnetism

Quiz by , created over 5 years ago

## 2 Electrical Science Quiz on Principles of electromagnetism, created by brightsparky79 on 05/10/2014.

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 Created by brightsparky79 over 5 years ago
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### Question 1

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

### Question 2

Question
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
• 50 V
• 500 V
• 5 V
• 5000 V

### Question 3

Question
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
• 1.8 V
• 1800 V
• 18 V
• 180 V

### Question 4

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

### Question 5

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

### Question 6

Question
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
• 300 V
• 33 V
• 3 V
• 30 V

### Question 7

Question
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
• 200 V
• 22 V
• 20 V
• 2 V

### Question 8

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

### Question 9

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

### Question 10

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

### Question 11

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

### Question 12

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

### Question 13

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

### Question 14

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

### Question 15

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

### Question 16

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

### Question 17

Question
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?
• 11v
• 1.5v
• 3v
• 9v

### Question 18

Question
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?
• 15v
• 60v
• 12v
• 6v

### Question 19

Question
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?
• 15v
• 100v
• 166v
• 60v

### Question 20

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

### Question 21

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

### Question 22

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

### Question 23

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

### Question 24

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

### Question 25

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

### Question 26

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

### Question 27

Question
What would be the effect of the two conductors that have the current flowing in the direction shown?
• 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

### Question 28

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

### Question 29

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

### Question 30

Question
Which of the following numbers would measure the periodic time?