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- What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
- What is the back EMF of the motor?
- What is back EMF of synchronous motor?
- The back emf of synchronous motor depends on?
- The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?
- What is the back EMF in Transformers?
- What is the back EMF?
- In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?
- What is back emf?
- What is back EMF in inductor?
- Do AC induction motors have back EMF?
- When the armature of a D.C. motor rotates, e.m.f. induced is
- The counter e.m.f. of a d.c. motor?
- The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors
- What is the RPM of a DC motor?
- What is the principle of DC motor?
- If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?
- As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent...
- What are the advantages of DC series motor?
- In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will?
- What would happen if a DC motor was supplied with AC ?
- In a DC motor, it is important to place the brushes along ______
- In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians
- What are the speed control methods of dc motor?
- The function of a brush and commutator arrangement in a dc motor is to
- If field current is decreased in shunt dc motor, the speed of the motor
- Which type of starter is used to start the DC motor?
- A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling
- A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance
- direction of DC motor is given by Fleming's left hand rule or right hand rule?
- Why does the speed of a DC shunt motor decrease as the load increases?
- A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.
- The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a
- State the function of following parts of DC motor : i) Yoke ii) Poles iii) Field winding iv) Commutator.
- Why a dc series motor has a high starting torque?
- Explain concept of back emf in DC machine. State how it governs armature current.
- In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at
- State at least one function and the material used for the following parts of DC Motor.
- State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
- Describe the reason of using dc series motor for electric trains.
- What is Phase sequence? Draw waveforms of 3 phase emf.
- Why dc series motor should not be started at no load?
- If the back emf of a dc motor is doubled and its speed is also doubled, the torque developed in the machine...
- Why DC motor is used for traction?
- is induction motor ac or dc?
- What is the EMF equation of the transformer?
- State any four applications of DC shunt motor.
- Armature control of DC motor
- Field control of DC motor
- Four Quadrant Operation Of DC Motor