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The magnetic field created when a current passes through a coil can be reversed by

adding capacitance

increasing the frequency

reversing the current

increasing the number of turns

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

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

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

Identify from the solenoid the position of the north pole

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

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

Which of the following would be the approximate peak value for a supply of 150V rms

212 V

106 V

235 V

95 V

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

Which of the following would be the frequency for a time period of 50 milli-seconds

25 Hz

20 Hz

50 Hz

40 Hz

Which of the following would be the frequency for a time period of 10 milli-seconds

10 Hz

200 Hz

100 Hz

Which of the following would be the frequency for a time period of 25 milli-seconds

which of the following is the time taken for one cycle of a 400Hz supply

5 mS

250 mS

2.5 mS

25 mS

According to the diagram below y represents

the peak amplitude

the peak to peak amplitude

the frequency

the time period

According to the diagram above X represents

If the frequency of supply is 1.5kHz, the periodic time is

0.66ms

66ms

660s

0.00006s

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

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

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?

100v

166v

If a supply voltage has a value of 240V the r.m.s value is

240V

255V

260V

170V

Outside a bar magnet the magnetic field goes from

South to south

North to north

South to north

North to south

An AC sine wave has a maximum value:

One per cycle

Twice per cycle

Three times per cycle

Never per cycle

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

To calculate the average value of a sine wave the following multiplier should be used?

0.543

0.89

0.707

0.637

To calculate the root-mean-square r.m.s value of a sine wave the following multiplier should be used?

0.2

0.88

0.7071

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

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

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

Which of the following numbers would measure the peak to peak voltage?

2 and 3

1 and 3

3 and 4

1 and 2

Which of the following numbers would measure the periodic time?

2 to 4

1 only

2 to 3

1 to 4