DC Motors In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be Anywhere between 75% and 90% Less than 50% Around 90% 1 Anywhere between 75% and 90% Less than 50% Around 90% 1 ANSWER DOWNLOAD EXAMIANS APP
DC Motors For constant torque drive which speed control method is preferred? Shunt armature control Field control Mechanical loading system Armature voltage control Shunt armature control Field control Mechanical loading system Armature voltage control ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following losses are significantly reduced by laminating the core of a D.C. generator? Hysteresis losses Copper losses Windage losses Eddy current losses Hysteresis losses Copper losses Windage losses Eddy current losses ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking Regenerative None of these Plugging Dynamic braking Regenerative None of these Plugging Dynamic braking ANSWER DOWNLOAD EXAMIANS APP
DC Motors Compensating winding in a dc machine is placed On armature On yoke in the pole faces On yoke in the interpolar gap None of the listed here On armature On yoke in the pole faces On yoke in the interpolar gap None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive motor vibration is caused by Bent shaft Open armature coil Too much brush tension Worn bearings Bent shaft Open armature coil Too much brush tension Worn bearings ANSWER DOWNLOAD EXAMIANS APP
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