DC Motors If the speed of a dc shunt motor is increased the back emf of the motor will Remains same Increase Decrease Become zero Remains same Increase Decrease Become zero ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor Of higher H.P. should be selected Can be used for 50°C ambient temperature also Of lower H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of higher H.P. should be selected Can be used for 50°C ambient temperature also Of lower H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor 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 A resistance is connected parallel to the armature A high value resistor is connected across the field winding Armature is temporarily open circuited A resistance is connected in series with armature A resistance is connected parallel to the armature A high value resistor is connected across the field winding Armature is temporarily open circuited A resistance is connected in series with armature ANSWER DOWNLOAD EXAMIANS APP
DC Motors A direct on line starter is used for starting motors Upto 20 HP Upto 5 HP Upto 10 HP Upto 15 HP Upto 20 HP Upto 5 HP Upto 10 HP Upto 15 HP ANSWER DOWNLOAD EXAMIANS APP
DC Motors The most suitable motor for elevators is the ____ motor. Cummulative compounded Series Differentially compuonded Shunt Cummulative compounded Series Differentially compuonded Shunt ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc motor if the back emf is absent Motor will burn Motor will run at very high speed Motor will run at very slow speed Motor will not run at all Motor will burn Motor will run at very high speed Motor will run at very slow speed Motor will not run at all ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS