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The Motor Effect and DC Electric Motors - Statistics
General Stats
- This quiz has been taken 9 times
- The average score is 10 of 29
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| What do motors convert electrical energy into? | Mechanical energy | 100%
|
| What does a current carrying conductor produce around it? | A magnetic field | 86%
|
| Two parallel current-carrying conductors _______ each other if their direction is the same. | Attract | 71%
|
| Two parallel current-carrying conductors _____ each other if their direction is opposite. | Repel | 57%
|
| What is the magnitude of the force when the object is parallel to the external magnetic field? | Zero | 57%
|
| Other than the split-ring, what are the other parts of the commutator (they are conducting contacts between the DC source and the split-ring) | Brushes | 43%
|
| A force is placed on specific objects when they enter an external magnetic field. What must these objects be? | Current-carrying conductors | 43%
|
| It is easier to rotate an object when the force is applied _______ ____ from the pivot axis.. | Further away | 43%
|
| What is the SI unit for torque? | Newton Metre | 43%
|
| In the initial force equation for the motor effect, what does the n represent? | Number of turns | 43%
|
| It is also easier to apply the force if the force is applied at _____ ______ to a line joining the pivot axis to its point of application. | right angles | 43%
|
| A simple DC motor usually consists of three parts and a source of current. What are these three parts? | Rotor (coil) | 43%
|
| Stator (magnets) | 43%
| |
| What is this effect called? | The motor effect | 43%
|
| Torque, T, is the _______ effect of a force acting on an object. | Turning | 43%
|
| The commutator ^ every time torque almost reaches what? | Zero | 43%
|
| What does the constant k in the above equation equal to? | 2.0x10^-7 | 29%
|
| What is the name for the frame that the coil rotates with? | Armature | 29%
|
| What equation do you use to calculate this force if the object is perpendicular to the external magnetic field? | F=Bil or F=nBil | 29%
|
| The brushes also stop the connecting wires from getting _______. | Tangled | 29%
|
| The magnetic field strength of a magnetic field emitted from a current-carrying conductor can be calculated using what equation? | B=ki/d | 14%
|
| Commutator (split-ring) | 14%
| |
| If two current-carrying conductors experience a force from each other, the equation to find out this force can be obtained by equating the above two equations to form a new equation. This equation is F=______/_. (Consider the two currents to be i1 and i2) | kli1i2/d | 14%
|
| To maximise torque, what must be done to any permanent magnets? | They must be curved | 14%
|
| What do AC split ring commutators do every half turn? | Changes the direction of the current | 0%
|
| Galvanometer | 0%
| |
| What are two common examples of DC motors? | Speakers | 0%
|
| Using the above two statements, what is the equation to calculate torque (assuming T is torque) (when refrencing the angle just write (angle)) | T=Fd(sin(angle)) | 0%
|
| Other than increasing the variables or using more coils, what is a way to increase the torque produced from a motor? | Using a soft iron core | 0%
|
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