DC Motors Which of the following motor is preferred for operation in highly explosive atmosphere? Air motor Battery operated motor Shunt motor Series motor Air motor Battery operated motor Shunt motor Series motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following can be used for controlling the speed of a dc motor? Transistor Thyristor Thermistor Thyratron Transistor Thyristor Thermistor Thyratron ANSWER DOWNLOAD EXAMIANS APP
DC Motors When the armature of a D.C. motor rotates, e.m.f. induced is Self-induced e.m.f. Back e.m.f. None of these Mutually induced e.m.f. Self-induced e.m.f. Back e.m.f. None of these Mutually induced e.m.f. ANSWER DOWNLOAD EXAMIANS APP
DC Motors The most suitable motor for elevators is the ____ motor. Series Shunt Cummulative compounded Differentially compuonded Series Shunt Cummulative compounded Differentially compuonded ANSWER DOWNLOAD EXAMIANS APP
DC Motors For constant torque drive which speed control method is preferred? Mechanical loading system Field control Shunt armature control Armature voltage control Mechanical loading system Field control Shunt armature control Armature voltage control ANSWER DOWNLOAD EXAMIANS APP
DC Motors As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit Armature is temporarily open circuited A resistance is connected parallel to the armature A resistance is connected in series with armature A high value resistor is connected across the field winding Armature is temporarily open circuited A resistance is connected parallel to the armature A resistance is connected in series with armature A high value resistor is connected across the field winding ANSWER DOWNLOAD EXAMIANS APP
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