26. Is the amount of motor reactive power Q higher than the amount of motor active power P when the three-phase induction motor operates without load? O No O Yes What does this indicate about three-phase induction motors operating without load?

Q2] Fill in the blank (9 Marks) 1-The current drwan by the armature of D.C. motor is directly proportional to 2- The speed of a D.C. shunt-wound motor will shunt field regulator is increased. 3- The synchronous speed of a three-phase induction motor is number of pairs of poles. Rotor copper losses Rotor input power in induction motor = 5- A 4-pole three-phase induction motor has a synchronous speed of 25 r.p.s. The frequency of the supply to the stator is_ Hz. 6- The power input to a mains transformer is 200VA. If the primary current is 2.5A, the secondary voltage is 2V and assuming no losses in the transformer, the turns ratio step down. is 7- A 200kVA transformer has an iron loss of 1 kW and full load cu loss of 2 kW. Its load kVA corresponding to maximum efficiency is kVA. 8- If cu loss of a transformer at 7/8th full load is 4900 W, then its full-load cu loss would be watt. 4- if the value of resistance of the proportional to the 9- The slight curvature at the lower end of the open…

2. A) Which of the following 3-phase motors has a wire wound rotor? a) polyphase induction motor b) polyphase wound rotor motor c) both "a" and "b" d) neither "a" nor "b" B) Which of the following 3-phase motors has a more maintenance free design. a) 3-phase wire wound rotor b) 3-phase squirrel-cage rotor