FE Exam Review: Electricity and Magnetism

This video tutorial by Tarek Massoud, an assistant professor at Marshall University, covers various topics related to the FE exam for Mechanical Engineering, focusing on electricity and magnetism. It includes solving problems on electrostatic fields, Kirchhoff's current law, circuit analysis, power factor, DC machines, and AC induction motors. The tutorial provides step-by-step solutions and explanations, helping students understand key concepts and problem-solving techniques in these areas.

What is the distance X between the first charge and the point of interest P if the electric field at P is zero?

• 3.66 meters

• 10 meters

• 5 meters

• 7.5 meters

According to Kirchhoff's current law, what is the current I in the circuit if the current entering the node is 5A, 10A, and I, and the current leaving is 3A?

• 3A

• -12A

• 15A

• 5A

What is the voltage across the 5 ohm resistor in the center leg of the circuit?

• 13V

• 20V

• 24V

• 16V

What is the correct formula for the power factor in a power triangle?

• P/S

• Q/S

• P/Q

• S/P

What capacitance is needed to achieve a power factor of 1 in the given circuit?

• 1.5 microfarad

• 7 microfarad

• 3.5 microfarad

• 5 microfarad

What is the field current produced by a DC generator with an armature constant of 0.5 and a field constant of 0.02?

• 5A

• 10A

• 15A

• 20A

What is the slip of an induction motor if the synchronous speed is 3600 RPM and the rotor speed is 3420 RPM?

• 7%

• 3%

• 5%

• 2%

What is the operating speed of a four-pole induction motor with a slip of 2% and a synchronous speed of 1800 RPM?

• 1800 RPM

• 1780 RPM

• 1764 RPM

• 1820 RPM

In a DC machine, what is the relationship between the induced voltage, magnetic flux, and speed?

• V = K * N / phi

• V = phi / K * N

• V = K * phi * N

• V = K / phi * N

What happens to the rotor speed of an induction motor when it reaches synchronous speed?

• It remains constant

• It decreases

• It stops

• It increases