In a 12/8-pole stepper motor, the rotor pole pitch isQuestion 7Select one:a.15ºb.45ºc.30ºd.60º

When we turn off one pole of the stepper and turn on the next pole, how far does the motor rotate?Question 6Select one:a.1/2 the tooth widthb.1 tooth widthsc.10 tooth widthsd.2 tooth widths

What is the rpm of a 4 pole motor operating at 60 hertz?Use formula     2x Hz x (60sec/min)                             (#of poles) a. 1800 b. 1200 c. 1600 d. 1400

Given a rotor in vertical climb with the following characteristics: σ=0.1,θ tw​ =−9 degrees, κ=1.15,C do​ =0.01 (for simple performance estimate), C l α​ ​ =5.7 (per radian) a. For the case where the rotor is in hover condition and the collective pitch angle is 10 degrees, compute the total inflow ratio λ=(V+ v)/ΩR at r/R=0.7 using B.E.M. theory. b. What will be the values of λ and λ i​ at r/R=0.7 for climb at λ c​ = V/ΩR=0.01 using the same pitch angle. c. Will C T​ be the same or different in cases a and b above? Explain theoretically. d. Comment on the reason of trend of values of λ i​ from hover to λ c​ = 0.01

10 kW, 6-pole, 50 Hz, 3- phase induction motor has linear torque-slip characteristicsbetween zero torque and maximum torque. The slip at which maximum torque of 520 Nmoccurs is 0.2. For mechanical losses of 600 W, find the speed at which motor would run whiledelivering rated shaft power.

A grindstone spinning at the rate of 12 rev/s has what approximate angular speed?Select one:a.3.2 rad/sb.52 rad/sc.26 rad/sd.75 rad/s