Test
Principles of electromagnetism - Outcome 3
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Preguntas del test (30)
1The magnetic field created when a current passes through a coil can be reversed by
- Aadding capacitance
- Bincreasing the frequency
- Creversing the current
- Dincreasing the number of turns
2What 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
- A50 V
- B500 V
- C5 V
- D5000 V
3What 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
- A1.8 V
- B1800 V
- C18 V
- D180 V
4For the direction of current shown the north pole is
- Aabove the solenoid
- Bat the left of the solenoid
- Cat the right of the solenoid
- Dbelow the solenoid
5Identify from the solenoid the position of the north pole
- Abelow the solenoid
- Bat the right of the solenoid
- Cat the left of the solenoid
- Dabove the solenoid
6What 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
- A300 V
- B33 V
- C3 V
- D30 V
7What 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
- A200 V
- B22 V
- C20 V
- D2 V
8Which of the following would be the approximate peak value for a supply of 150V rms
- A212 V
- B106 V
- C235 V
- D95 V
9Which of the following would be the approximate rms value for a peak supply of 180 V
- A115 V
- B255 V
- C127 V
- D282 V
10Which of the following would be the frequency for a time period of 50 milli-seconds
- A25 Hz
- B20 Hz
- C50 Hz
- D40 Hz
11Which of the following would be the frequency for a time period of 10 milli-seconds
- A10 Hz
- B200 Hz
- C50 Hz
- D100 Hz
12Which of the following would be the frequency for a time period of 25 milli-seconds
- A40 Hz
- B50 Hz
- C20 Hz
- D25 Hz
13which of the following is the time taken for one cycle of a 400Hz supply
- A5 mS
- B250 mS
- C2.5 mS
- D25 mS
14According to the diagram below y represents
- Athe peak amplitude
- Bthe peak to peak amplitude
- Cthe frequency
- Dthe time period
15According to the diagram above X represents
- Athe peak amplitude
- Bthe peak to peak amplitude
- Cthe frequency
- Dthe time period
16If the frequency of supply is 1.5kHz, the periodic time is
- A0.66ms
- B66ms
- C660s
- D0.00006s
17If 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?
- A11v
- B1.5v
- C3v
- D9v
18If 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?
- A15v
- B60v
- C12v
- D6v
19If 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?
- A15v
- B100v
- C166v
- D60v
20If a supply voltage has a value of 240V the r.m.s value is
- A240V
- B255V
- C260V
- D170V
21Outside a bar magnet the magnetic field goes from
- ASouth to south
- BNorth to north
- CSouth to north
- DNorth to south
22An AC sine wave has a maximum value:
- AOne per cycle
- BTwice per cycle
- CThree times per cycle
- DNever per cycle
23From the diagram below the direction of current is said to be
- AFlowing from A to B
- BFlowing from B to A
- CFlowing up and down
- DIn a waveform formation
24To calculate the average value of a sine wave the following multiplier should be used?
- A0.543
- B0.89
- C0.707
- D0.637
25To calculate the root-mean-square r.m.s value of a sine wave the following multiplier should be used?
- A0.637
- B0.2
- C0.88
- D0.7071
26What principle would we apply to find the magnetic north pole in this solenoid?
- ARight Hand Grip Rule
- BFlemings Right Hand Rule
- CFlemings Left Hand Rule
- DLenz Law
27What would be the effect of the two conductors that have the current flowing in the direction shown?
- AThe magnetic fields will allow for a resonance to occur and produce sound waves to communicate with other conductors
- BThe magnetic field would flow and produce a resistance which will oppose the capacitance of an inductor
- CThe magnetic field would become strong in between the conductors repelling the conductors away
- DThe magnetic field would strengthen and produce a larger magnetic field around both conductors
28Which of the following is correct?
- AAll magnets have five poles
- BAll magnets have three poles
- CAll magnets have one pole
- DAll magnets have two poles
29Which of the following numbers would measure the peak to peak voltage?
- A2 and 3
- B1 and 3
- C3 and 4
- D1 and 2
30Which of the following numbers would measure the periodic time?
- A2 to 4
- B1 only
- C2 to 3
- D1 to 4
Información
- Descripción
- Level 2 Electrotechnical 202 Test sobre Principles of electromagnetism - Outcome 3, creado por Jamie Parslow-Williams el 02/02/2017.
- Idioma
- English
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