Wednesday, January 13, 2016

Electric Machines Test No.1

Q.1

A motor’s shaft is spinning at a speed of 3000 r/min. What is the shaft speed in radians per second?

Q.2

A flywheel with a moment of inertia of 2 kg m^2 is initially at rest. If a torque of 5 N m counterclockwise is suddenly applied to the flywheel, what will be the speed of the flywheel after 5 s?
Q.3

A motor is supplying 60 N m of torque to its load. If the motor’s shaft is turning at 1800 r/min, what is  the mechanical power supplied to the load in watts? In horsepower?


Q.4

If you have mechanical power in watts is 11,310 w. what will be power in horsepower?
Q.5

A wire of length 1m which is carrying 5.0 A in the presence of a magnetic field 0.25T at right angle  . Calculate the magnitude and direction of the force induced on the wire.