Principles of electromagnetism

brightsparky79
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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brightsparky79
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
Answer
  • adding capacitance
  • 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
Answer
  • 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
Answer
  • 1.8 V
  • 1800 V
  • 18 V
  • 180 V

Question 4

Question
For the direction of current shown the north pole is
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 5 mS
  • 250 mS
  • 2.5 mS
  • 25 mS

Question 14

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

Question 15

Question
According to the diagram above X represents
Answer
  • 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
Answer
  • 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?
Answer
  • 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?
Answer
  • 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?
Answer
  • 15v
  • 100v
  • 166v
  • 60v

Question 20

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

Question 21

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

Question 22

Question
An AC sine wave has a maximum value:
Answer
  • 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
Answer
  • 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?
Answer
  • 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?
Answer
  • 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?
Answer
  • 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?
Answer
  • 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?
Answer
  • 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?
Answer
  • 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?
Answer
  • 2 to 4
  • 1 only
  • 2 to 3
  • 1 to 4