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Electric Vehicles Final Study Guide
Questions And Answers 100% Pass
Power electronic for modern battery electric vehicles have efficiencies less than 80%. (T/F?) -
Answer✔False
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?) - Answer✔True
Most modern electric cars use three phase variable reluctance motors. (T/F?) - Answer✔False
Modern three phase brushless Dc motors (synchronous AC motors) have strong permanent
magnets in the rotors (T/F?) - Answer✔True
Modern three phase induction motors have strong permanent magnets in the rotators. (T/F?) -
Answer✔False
The stators of modern three phase brushless DC motors and modern induction motors can be
very similar. (T/F?) - Answer✔True
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?) - Answer✔True
Most modern gasoline/electric hybrid cars use induction motors. (T/F?) - Answer✔False
Some modern plug in battery electric cars use induction motors. (T/F?) - Answer✔True
A modern three phase induction motor with a controller for an electric car cannot produce torque
at zero speed. (T/F?) - Answer✔False
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. -
Answer✔F = BIL
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. -
Answer✔E = BLV
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?) - Answer✔True
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Electric Vehicles Final Study Guide
Questions And Answers 100% Pass
Power electronic for modern battery electric vehicles have efficiencies less than 80%. (T/F?) -
Answer✔False
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?) - Answer✔True
Most modern electric cars use three phase variable reluctance motors. (T/F?) - Answer✔False
Modern three phase brushless Dc motors (synchronous AC motors) have strong permanent
magnets in the rotors (T/F?) - Answer✔True
Modern three phase induction motors have strong permanent magnets in the rotators. (T/F?) -
Answer✔False
The stators of modern three phase brushless DC motors and modern induction motors can be
very similar. (T/F?) - Answer✔True
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?) - Answer✔True
Most modern gasoline/electric hybrid cars use induction motors. (T/F?) - Answer✔False
Some modern plug in battery electric cars use induction motors. (T/F?) - Answer✔True
A modern three phase induction motor with a controller for an electric car cannot produce torque
at zero speed. (T/F?) - Answer✔False
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. -
Answer✔F = BIL
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. -
Answer✔E = BLV
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?) - Answer✔True
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