By flux control method of speed control of a dc shunt motor, we can obtain speeds. Above the normal speed only None of the listed here Above as well as below the normal speed Below the normal speed only TRUE ANSWER : ? YOUR ANSWER : ?
The commutating pole winding is connected in Parallel with the armature Series-parallel with the armature None of the listed here Series with the armature TRUE ANSWER : ? YOUR ANSWER : ?
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses This will make armature to take heavy current, possibly burning it Motor will run at very slow speed Nothing will happen to the motor TRUE ANSWER : ? YOUR ANSWER : ?
Which motor has the poorest speed control? Series motor Shunt motor Cummulative compounded motor Differentially compounded motor TRUE ANSWER : ? YOUR ANSWER : ?
For starting a dc motor a starter is required because It limits the speed of the motor None of the listed here It limits the starting current to a safe value It starts the motor TRUE ANSWER : ? YOUR ANSWER : ?
The back emf in a dc motor ______ Aids the armature current Opposes the applied voltage Aids the applied voltage None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following methods gives the greatest braking torque? Plugging None of the listed here Regenerative braking Rheostatic braking TRUE ANSWER : ? YOUR ANSWER : ?
One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven None of these Also runs as a motor comes to stop after sometime Does not run as a generator Runs as a generator TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following loss in a D.C. generator varies significantly with the load current? Windage loss Field copper loss None of these Armature copper loss TRUE ANSWER : ? YOUR ANSWER : ?
Dc series motors are used in those applications where _____ is required. None of the listed here Low no load speed High starting torque Constant speed TRUE ANSWER : ? YOUR ANSWER : ?