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- 23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -When the armature current of a 220V DC shunt motor is 40Amper, the armature current of the motor increases to 80A when the magnetic flux suddenly drops by 10%. Which of the following is the armature winding resistance of the motor?The frequency of induction motor is 50 Hz and the slip is 2.5% then frequency of rotor current is a. 1 Hz b. 1.2 HZ c. 1.25 HZ d. 1.5 HZ
- Explain how does the current will be reduced during the starting of the motor.H.W 1) A 4-pole, 500 V d.c. shunt motor has 720 wave-connected conductors on its armature. The full-load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Q and the contact drop is 1 V per brush. Calculate the full-load speed of the motor. H.W 2) A d.c. series motor with series field, and armature resistance of 0.06 ohm and 0.04 ohm respectively is connected across 220 V mains. The armature takes 40 A, and its speed is 900 rpm. Determine its speed when the armature takes 75 A, and excitation is increased by 15% due to saturation.A belt-driven 0.16 MW shunt-wound DC generator is running at 460 rpm and is supplying full load to a bus bar at 230 V. At what speed will it run if the belt breaks and the machine continues to run taking 9 kW from the bus bar? The armature and the field resistances are 0.05 Ohm and 100 Ohms respectively. The brush contact drop is 2 Volts per brush.
- The armature winding resistance of a 200 Volt 4-pole DC motor is 2 ohms. Under full load, the armature current of the motor is up to 10 A. Armature coil is parallel wound and has 360 conductors. Since the magnetic flux under the pole foot of the motor is 12.5 mWb, which of the following is the motor speed? a 2100 rpm b. 2400 rpm C. 2500 rpm d.2300 d minA 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the back emf? What is the developed torque?A 4–pole, 500 V d.c. shunt motor has 720 wave–connected conductors on its armature. The full–load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Ω. What is the full–load speed of the motor?
- Q3) A 4 pole wave wound short shunt compound DC Generator supplies a current of 100 A to a load of 10 KW through a cable of resistance Reable is hundred times the resistance of one of the armature conductor, given that the series field resistance is 0.02 ohm, shunt field resistance is 200 ohm, flux per pole is 0.035 Web, total number of armature conductors is 120, speed of generator is 600 RPM, and on load generated voltage is 110 V. Calculate armature resistance.With aid of a diagrams explain how the starter of a DC motor works15. What are the following statements are true for DC Motor? I. Motor converts Electrical Energy to Mechanical Energy II. Motor supply current to the armature winding III. Back EMF is lesser than the Supply voltage IV. Fleming's Right-hand rule a. I and II b. II and IV c. I,II and III d. I,II and IV