I just need answers (H) How do you know that the compound motor provides good sp

Question

I just need answers

(H) How do you know that the compound motor provides good speed control at the no-load condition? 1) The torque speed curve is flat near zero torque. This means that small changes in load do not appreciably change the speed 2) The torque speed curve is flat near zero torque. This means that large changes in load do not appreciably change the speed 3) The torque speed curve has a large slope near zero torque. This means that large changes in load lead to very small changes in speed 4) The compound motor runs at slow speeds when heavily loaded 5) Items (1) and (4) (I) You are designing a new emergency brake mechanism for an automobile featuring one of the following DC motors. Which one would you choose? 1) Permanent magnet motor 2) Brushless motor 3) Servomotor 4) Compound wound motor 5) Torque motor (Q) Suppose you are building a machine where the timing sequence of two drive axes requires that they operate at precisely the same speed. What type of motor would you select: AC or DC and why? 1) You select identical DC motors because controlling frequency input gives simple and precise speed control 2) You select identical AC motors because highly accurate and reliable AC speed controllers can be bought for very cheap prices 3) You select identical DC motors because controlling voltage input gives simple and precise speed control 4) You select identical AC motors because the variance of torque and speed specs on NEMA specified motors is very small 5) It doesn't matter whether you select an AC or a DC motor. The cost of supplying accurate speed control for either type of motor is the same

Explanation / Answer

H) 5) item number 1) and 4)

I) Torque Motor

Q) 2) You select identicl AC motors because highly accurate and reliable AC speed controller can be bought at very cheap prices

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