Electric Vehicles Final Study Guide – Complete Revision Notes
False - correct answer ✔✔Power electronic for modern battery electric vehicles have
efficiencies less than 80%. (T/F?)
True - correct answer ✔✔A disadvantage of a DC motor with brushes and mechanical
commutator (switch) is that the brushes wear out and need to be replaced. (T/F?)
False - correct answer ✔✔Most modern electric cars use three phase variable reluctance
motors. (T/F?)
True - correct answer ✔✔Modern three phase brushless Dc motors (synchronous AC motors)
have strong permanent magnets in the rotors (T/F?)
False - correct answer ✔✔Modern three phase induction motors have strong permanent
magnets in the rotators. (T/F?)
True - correct answer ✔✔The stators of modern three phase brushless DC motors and modern
induction motors can be very similar. (T/F?)
True - correct answer ✔✔Modern three phase induction motors have "squirrel cage" rotors that
are made of a magnetic material (iron) and a good conductor (copper or aluminum). (T/F?)
False - correct answer ✔✔Most modern gasoline/electric hybrid cars use induction motors.
(T/F?)
True - correct answer ✔✔Some modern plug in battery electric cars use induction motors.
(T/F?)
, False - correct answer ✔✔A modern three phase induction motor with a controller for an
electric car cannot produce torque at zero speed. (T/F?)
F = BIL - correct answer ✔✔What is the equation for the force, F, in Newtons on a wire of length
L meters, running through a constant magnetic field of B Webbers/(square meter) with the wire
carrying a current, I amps.
E = BLV - correct answer ✔✔What is the equation for the "back electromotive force (EMF)"
denoted by E, generated in a wire of length L, moving at a velocity V perpendicular to a
magnetic field of constant flux density B.
True - correct answer ✔✔The torque produced by a brush-commutator DC motor having a
permanent magnet stator is proportional to the current I in the coil winding of the motor rotor
(some other types of motors have a similar torque-current relationship). (T/F?)
False - correct answer ✔✔Most modern electric motors do not need a controller (electronics) to
limit the maximum current at zero speed. (T/F?)
True - correct answer ✔✔In an electric car, regenerative braking occurs when the electric motor
controller produces a higher voltage on the battery terminals than the open circuit voltage of
the battery. (T/F?)
False - correct answer ✔✔A controller for a modern brushless DC motor for an electric car does
not need to have information about the angular position of the permanent magnet rotor. (T/F?)
True - correct answer ✔✔A controller for a modern induction motor for an electric car does not
need to have information about the angular position of the rotor. (T/F?)
False - correct answer ✔✔The rotor of the three phase brushless DC motor does not have to
turn a the same angular velocity as the angular velocity of the magnetic field around the stator
coils. (T/F?)
False - correct answer ✔✔Power electronic for modern battery electric vehicles have
efficiencies less than 80%. (T/F?)
True - correct answer ✔✔A disadvantage of a DC motor with brushes and mechanical
commutator (switch) is that the brushes wear out and need to be replaced. (T/F?)
False - correct answer ✔✔Most modern electric cars use three phase variable reluctance
motors. (T/F?)
True - correct answer ✔✔Modern three phase brushless Dc motors (synchronous AC motors)
have strong permanent magnets in the rotors (T/F?)
False - correct answer ✔✔Modern three phase induction motors have strong permanent
magnets in the rotators. (T/F?)
True - correct answer ✔✔The stators of modern three phase brushless DC motors and modern
induction motors can be very similar. (T/F?)
True - correct answer ✔✔Modern three phase induction motors have "squirrel cage" rotors that
are made of a magnetic material (iron) and a good conductor (copper or aluminum). (T/F?)
False - correct answer ✔✔Most modern gasoline/electric hybrid cars use induction motors.
(T/F?)
True - correct answer ✔✔Some modern plug in battery electric cars use induction motors.
(T/F?)
, False - correct answer ✔✔A modern three phase induction motor with a controller for an
electric car cannot produce torque at zero speed. (T/F?)
F = BIL - correct answer ✔✔What is the equation for the force, F, in Newtons on a wire of length
L meters, running through a constant magnetic field of B Webbers/(square meter) with the wire
carrying a current, I amps.
E = BLV - correct answer ✔✔What is the equation for the "back electromotive force (EMF)"
denoted by E, generated in a wire of length L, moving at a velocity V perpendicular to a
magnetic field of constant flux density B.
True - correct answer ✔✔The torque produced by a brush-commutator DC motor having a
permanent magnet stator is proportional to the current I in the coil winding of the motor rotor
(some other types of motors have a similar torque-current relationship). (T/F?)
False - correct answer ✔✔Most modern electric motors do not need a controller (electronics) to
limit the maximum current at zero speed. (T/F?)
True - correct answer ✔✔In an electric car, regenerative braking occurs when the electric motor
controller produces a higher voltage on the battery terminals than the open circuit voltage of
the battery. (T/F?)
False - correct answer ✔✔A controller for a modern brushless DC motor for an electric car does
not need to have information about the angular position of the permanent magnet rotor. (T/F?)
True - correct answer ✔✔A controller for a modern induction motor for an electric car does not
need to have information about the angular position of the rotor. (T/F?)
False - correct answer ✔✔The rotor of the three phase brushless DC motor does not have to
turn a the same angular velocity as the angular velocity of the magnetic field around the stator
coils. (T/F?)
