Identify the type of synchronous machine that uses number of poles two or four. a. Squirrel cage type b. Non- Cylindrical pole type c. Cylindrical pole type d. Salient pole type Why the stator core is made of silicon steel in Synchronous machine? a. to reduce eddy current loss b. to reduce copper loss c. to reduce hysteresis loss d. to reduce friction and widage current loss

A 4 pole machine generates 250 volts when operated at 1500 rpm. If the flux per pole is 1.85 x 10°maxwell. The number of armature slots is 45 and the armature winding has two parallel paths. Calculate. a). the total number of armature conductor. b). the number of conductor in each slot c). If the speed of the generator is decrease to 1,350 rpm, what will be the generated voltage if the flux per pole is maintained at the value. d). To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same. (Hint: Eav and Eg = lave x ²) ØXP X t

and the armature current 14.5 A. calculate the following: a) The number of conductors on the armature b) The value of the counter-emf at full load c) The flux per pole, in milliwebers [mWb] The following details are given: 73 mm 115 mm 20 40 Armature diameter: armature length: armature slots Image Word A 1.5 hp Permanent magnet motor generates a voltage of 90 V when the motor runs at 2900 r/min. commutator bars: turns per coil: Armature resistance at 20°C: 0.34 2. on P I Sign Extract Text I Share 1/1 More

A 4 pole lap wound dc machine has 728 active conductors running at 1800 rpm. The flux per pole is 30mWb, The armature current is 120 A, What is the electromagnetic power developed in the armature?