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16 Cards in this Set
- Front
- Back
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If the current in a current carrying conductor in a magnetic field is reversed, the direction of the force tending to move the conductor will: 1) Tend to accelerate 2) Reverse 3) Be displaced 4) Be tangential 5) Remain constant |
Reverse |
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The major difference between an AC and a DC generator is that a DC generator has: 1) A rotor 2) A commutator 3) A field 4) Slip rings 5) A set of anti-friction bearings |
A commutator |
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When magnetic flux lines travel and meet in opposing directions the result can be: 1) Electromagnetism 2) Reluctance 3) Generator action 4) Motor action 5) Solenoid action |
Motor action |
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The direction of the _____ due to motor action may be determined using Fleming's Left Hand Rule. 1) Force 2) Resistance 3) Applied voltage 4) Current 5) Rotation |
Force |
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The right hand rule for generators is used to: 1) Determine magnetic flux rotation 2) Indicate the speed of a rotor 3) Determine the frequency of an alternator 4) Determine direction of motor rotation 5) Determine direction of induced current flow |
Determine direction of induced current flow |
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The property of good conductivity of magnetic flux is called: 1) Conductivity 2) Capacitance 3) Magnetism 4) Fluctuation 5) Permeability |
Permeability |
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A current carrying conductor being moved by a magnetic field is the principle known as: 1) Electrolysis 2) Generator action 3) Motor action 4) Hydro-electrics 5) Magnetic flux |
Motor action |
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When a conductor is moved to cut magnetic flux lines at an angle of 90 degrees: 1) Maximum resistance to current flow is attained 2) Motor action will be experienced 3) Current will flow with the least resistance 4) Voltage generated will be maximum 5) Motion will be easiest |
Voltage generated will be maximum |
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Current flow direction and intensity will: 1) Affect the resistance of a circuit 2) Not affect electromagnetic field direction 3) Affect the voltage 4) Not affect electromagnetic field intensity 5) Affect magnetic field direction and intensity |
Affect magnetic field direction and intensity |
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The total number of lines of force per square metre in a magnetic field is: 1) Depends on the force of gravity 2) Known as the EMF 3) Called the magnetic flux 4) Controlled by varying the temperature 5) Determined by the north magnetic pole |
Called the magnetic flux |
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The minimum voltage generated by a single loop DC generator occurs when the conductor is cutting the magnetic lines of force at an angle of: 1) 270° 2) 120° 3) 45° 4) 90° 5) 180° |
180° |
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When using Fleming's Left Hand Rule, the index finger represents: 1) Motor action direction of current flow 2) Generator action flux direction 3) Generator conductor motion direction 4) Motor action motion direction 5) Motor action flux direction |
Motor action flux direction |
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When like poles of a magnet are placed adjacent to each other they will: 1) Repel each other 2) Increase in temperature 3) Be attracted to each other 4) Bend 5) Have no reaction |
Repel each other |
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If two unlike poles are placed adjacent to each other there is a: 1) Product of AC power 2) Reversal of the north and south poles of each magnet 3) Force of repulsion between the magnets 4) Force of attraction between the magnets 5) Development of iron filings between the magnets |
Force of attraction between the magnets |
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If a conductor is held stationary and a magnetic field is moved across it, what is formed? 1) Conduction 2) Generator action 3) Transformer action 4) Electromagnetism 5) Motor action |
Generator action |
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The direction of the _____ due to motor action may be determined using Fleming's Left Hand Rule. 1) Resistance 2) Applied voltage 3) Current 4) Force 5) Rotation |
Force |
