Given a motor with the following parameters: Rw = 12 Ω (winding resistance) Kv = 5.67mV/RPM (back e.m.f. constant) Kt = 552 gm-cm/A (Torque constant) Rf = 0.0236 gm-cm/RPM (mechanical friction) (a) What voltage should be provided for unloaded speed of 4000 RPM? (b) Let the motor drive two similar generators. What speed should be at 16Volts?

A 2300V, 1000 kVA, 0.8 lagging power factor, two-pole, 60HZ, Wye-connected, synchronous generator has a synchronous reactance of 1.1 ohms and an armature resistance of 0.15 ohms. Its losses due to friction and friction with the air are 24 kW and its core losses are 18 kW. The field circuit has a dc voltage of 200v and a maximum of 10A. The field circuit current is adjustable in the range of 20 to 200 ohms.The magnetization curve of this generator is shown in the figure below.a) How much field current is required for Vt to equal 2300V when the generator is running without load?b) What is the voltage generated intermittently by this machine at nominal conditions?c) How much field current is needed to make the voltage at the terminals Vt=2300V when the generator works in nominal conditions?d) How much power and torque should the prime mover of the generator be able to supply?

A 5000 hp synchronous motor is running at full load with a leading pf of 87 percent and assuming 100% efficiency. How many kilovolt-amperes is it drawing? Select one: a. 4.3 kVA b. 4440 kVA c 4287 KVA d. 3730 kVA