2- 1- The value of (Xm) in the transformer equivalent-circuit model comparing with its value in induction motor model i Select one Ca higher b almost the same c smaller d it depends If the load torque on the dc motor shaft decreased Select one a the motor will draw the same current b the motor will operate at the same speed c. the motor will operate at higher speed d none 3- In the linear-transformer equivalent-circuit model the value of (X) comparing with R, or R, is 4- 5- 6- Select one Oa almost the same b much smaller cit depends d much greater e slightly higher The block diagram model of the dc motor may be considered as Select one a. A negative feed-back control system b. a mechanical system c. none d. A positive feed-back control system In case of increasing the value of (Ko) of this dc motor model, this will yield to Select one a. less starting current b. higher starting current c. less motor torque d. less idle speed If the load torque on the dc motor shaft increased 7- Select one a the motor will operate at lower speed b. the motor will draw the same current c none d the motor will draw smaller current e the motor will operate at the same speed The value of (Ko) in the dc motor model depends on: Select one a. the motor construction and the field current b. the motor construction and the armature current c. the motor construction only d. none e. the motor size