RA RF VT EA LF Figure 15.21

please solve asap

A motor’s rotor spins at 1,000 rpm when no load is applied (i.e. torque = 0), but reduces to 900rpm when the rated torque of 2.3 N-m is applied. Determine the speed regulation and output horsepower at the rated load condition. If the motor’s input power is 500 Watts at the rated load condition, what is the efficiency?

Consider a separately-excited DC motor with an armature resistance RA = 0.2 N and terminal voltage VT = 130 V. The motor rated speed is 1000 RPM. The field winding supply VF= 24 V and the field resistance is adjustable. The motor has compensating windings and interpoles. 0.3 IF (A) EA (V) 0.0 0.1 0.2 0.4 0.5 0.6 0.7 0.8 30 102 These values were taken at speed n= 1000 RPM 60 85 115 124 130 134 If the motor is driving a load at rated armature current IA = 60 A, with Radi +RF = 40 2. Find the speed of rotation ofthe motor in RPM.Select one: a. Speed n = 952 RPM b. None c. Speed n = 1051 RPM d. Speed n = 1000 RPM

The synchronous reactance of a cylindrical rotor machine is 1.2 p.u. The machine is connected to an infinite bus whose voltage is 1 p.u. through an external reactance of 0.3 p.u. For a power output of 0.7 p.u., the power angle is found to be 30°.A. Find the excitation voltage Ef and the pullout power Pmax .B. For the same power output the power angle is to be reduced to 25°.Find the value of the reduced external reactance connecting the machine to the bus to achieve this. What would be the new pullout power Pmax ?