DC Motors Excessive motor vibration is caused by Worn bearings Too much brush tension Open armature coil Bent shaft Worn bearings Too much brush tension Open armature coil Bent shaft ANSWER DOWNLOAD EXAMIANS APP
DC Motors One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven Also runs as a motor comes to stop after sometime Does not run as a generator Runs as a generator None of these Also runs as a motor comes to stop after sometime Does not run as a generator Runs as a generator None of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control Four point starter is used Three point starter is used Drum type controller is used All above can be used Four point starter is used Three point starter is used Drum type controller is used All above can be used ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which method of braking is generally used in elevators? None of these Rheostat braking Regenerative braking Plugging None of these Rheostat braking Regenerative braking Plugging ANSWER DOWNLOAD EXAMIANS APP
DC Motors The value of back emf in dc motor is maximum at Half full load No load None of the listed here Full load Half full load No load None of the listed here Full load ANSWER DOWNLOAD EXAMIANS APP
DC Motors The variable resistor shunting the field of a dc series motor is called a Potential divider Voltage regulator Armature divertor Field divertor Potential divider Voltage regulator Armature divertor Field divertor ANSWER DOWNLOAD EXAMIANS APP
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