Back EMF of DC motor depends on

Related MCQs

• If the back emf in a dc motor varnishes suddenly, then the motor:
• The value of back EMF in a DC motor is maximum at ____.
• The mechanical power developed in a dc motor is maximum when back emf (Eb) is equal to ------the applied voltage (V)
• The amount of back emf of a shunt motor will increase when
• A 440V shunt motor has an armature resistance of 0.8Ω field reistnace of 200Ω . Find the back emf when giving an output of 7.46kW at 85 % efficiency?
• A 220V DC series motor is taking a current of 40A. Resistance of armature is 0.5Ω and series field is 0.25Ω. What is the back emf?
• A 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?
• In a 240v dc motor, back emf is 220v and Ra= 0.5Ω then its armature current is
• If the applied voltage to a DC machine is 230V, then back emf for maximum power developed is ___.
• The counter emf of dc motor