Statistics for The Motor Effect and DC Electric Motors

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General Stats

This quiz has been taken 7 times
The average score is 13 of 29

Answer Stats

Question	Answer	% Correct
What does a current carrying conductor produce around it?	A magnetic field	100%
What do motors convert electrical energy into?	Mechanical energy	100%
Two parallel current-carrying conductors _______ each other if their direction is the same.	Attract	80%
Two parallel current-carrying conductors _____ each other if their direction is opposite.	Repel	80%
What is the magnitude of the force when the object is parallel to the external magnetic field?	Zero	80%
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	60%
A force is placed on specific objects when they enter an external magnetic field. What must these objects be?	Current-carrying conductors	60%
It is easier to rotate an object when the force is applied _______ ____ from the pivot axis..	Further away	60%
What is the SI unit for torque?	Newton Metre	60%
In the initial force equation for the motor effect, what does the n represent?	Number of turns	60%
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	60%
What is this effect called?	The motor effect	60%
Torque, T, is the _______ effect of a force acting on an object.	Turning	60%
The commutator ^ every time torque almost reaches what?	Zero	60%
What does the constant k in the above equation equal to?	2.0x10^-7	40%
What is the name for the frame that the coil rotates with?	Armature	40%
What equation do you use to calculate this force if the object is perpendicular to the external magnetic field?	F=Bil or F=nBil	40%
A simple DC motor usually consists of three parts and a source of current. What are these three parts?	Rotor (coil)	40%
	Stator (magnets)	40%
The brushes also stop the connecting wires from getting _______.	Tangled	40%
The magnetic field strength of a magnetic field emitted from a current-carrying conductor can be calculated using what equation?	B=ki/d	20%
	Commutator (split-ring)	20%
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	20%
To maximise torque, what must be done to any permanent magnets?	They must be curved	20%
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%