DC Motors In variable speed motor Same commutating field is needed at low speed than at high speed A stronger commutating field is needed at low speed than at high speed None of these A weaker commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed A stronger commutating field is needed at low speed than at high speed None of these A weaker commutating field is needed at low speed than at high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors The mechanical power developed by a shunt motor will be maximum when the ratio of back emf to applied voltage is 0.5 1.0 4.0 2.0 0.5 1.0 4.0 2.0 ANSWER DOWNLOAD EXAMIANS APP
DC Motors Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control Three point starter is used Four point starter is used All above can be used Drum type controller is used Three point starter is used Four point starter is used All above can be used Drum type controller is used ANSWER DOWNLOAD EXAMIANS APP
DC Motors A dc motor is still used in industrial applications because it Provides fine speed control Is cheap Is simple in construction None of the listed here Provides fine speed control Is cheap Is simple in construction None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors Differentially compound D.C. motors can find applications requiring Low starting torque Frequent on-off cycles High starting torque Variable speed Low starting torque Frequent on-off cycles High starting torque Variable speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors The mechanical power developed in a dc motor is maximum when back emf is equal to _____ the applied voltage. One-third Twice Half None of the listed here One-third Twice Half None of the listed here ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS