DC Motors Which of the following can be used for controlling the speed of a dc motor? Thyristor Thyratron Thermistor Transistor Thyristor Thyratron Thermistor Transistor ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses Nothing will happen to motor This will make armature to take heavy current, possibly burning it Motor will come to stop This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses Nothing will happen to motor This will make armature to take heavy current, possibly burning it Motor will come to stop ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the speed of a dc shunt motor is increased the back emf of the motor will Become zero Remains same Increase Decrease Become zero Remains same Increase Decrease ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which motor should be used for centrifugal pumps? Either series or shunt Series motor Shunt motor None of the listed here Either series or shunt Series motor Shunt motor None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be 1 Less than 50% Around 90% Anywhere between 75% and 90% 1 Less than 50% Around 90% Anywhere between 75% and 90% ANSWER DOWNLOAD EXAMIANS APP
DC Motors Small dc motors up to 5 HP usually have 6 poles 2 poles 4 poles 8 poles 6 poles 2 poles 4 poles 8 poles ANSWER DOWNLOAD EXAMIANS APP
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