A variable reluctance stepper motor is constructed of ... material with salient poles.Question 4Select one:a.Ferromagneticb.Paramagneticc.Diamagneticd.Non-magnetic

Which of the following material is slightly repelled by a magnet?Group of answer choicesparamagneticdiamagneticferromagnetic

Write short notes on construction and working of CO4 a) 3 Phase Induction Motor b) Stepper Motors

A stepper motor is a ... device.Question 7Select one:a.Incrementalb.Analoguec.Electricald.Mechanical

Alice builds an electric motor by positioning an electromagnet between the poles of a permanent magnet. The electromagnet spins as the current running through it repeatedly switches directions.How could Alice decrease the force that the permanent magnet applies on the electromagnet? A. increase the electric current running through the electromagnet B. decrease the number of turns in the electromagnet's coil C. replace the magnet with a stronger magnet D. decrease the distance between the magnet's poles and the electromagnet

Mrs. Peterson assigned the students in her class a project to design a simple electric motor. Each student had to use a permanent magnet and an electromagnet made up of a coil of wire wrapped around an iron core. To be successful, the motor had to spin at least 150 times per minute. After the students designed their motors, each motor was connected to the same voltage source, and the number of turns the motor made in 5 seconds was counted. The table below describes each student's motor.Electric Motor DesignsStudent Name Number of Turnsin the Electromagnet'sWire Coil Material of the Wire Coil Thickness of the Wire Used in the Coil Rate at Which the Motor SpinsLupe 15 copper 0.4 mm 17 turns in5 secondsSanjay 5 aluminum 0.4 mm 4 turns in5 secondsOliver 5 copper 1.2 mm 21 turns in5 secondsRebekah 15 aluminum 1.2 mm 11 turns in5 secondsFelipe 15 aluminum 0.4 mm 7 turns in5 secondsWhich students met the criteria for success? A. Lupe, Oliver, Rebekah, and Felipe only B. Lupe, Oliver, and Rebekah only C. Lupe and Oliver only D. Lupe, Sanjay, Oliver, Rebekah, and Felipe