D.C. shunt motors are used for driving machine tools.
Last Answer : In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.
Last Answer : In D.C. shunt motors as load is reduced the speed will remain almost constant.
Last Answer : Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.
Last Answer : During rheostat braking of D.C. series motors motor is run as a generator.
Last Answer : The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.
Description : Why does the speed of a DC shunt motor decrease as the load increases?
Last Answer : Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.
Last Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.
Last Answer : If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.
Description : A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Last Answer : A relay used for protection of motors against overload is : Thermal relay
Description : Stepper motors are used in (1) printers (2) lifts (3) amplifiers (4) oscillators
Last Answer : Stepper motors are used in printers
Last Answer : The capacitors used in single-phase capacitor motors have no polarity marking.