DC Motors Usually wide and sensitive speed control is desired in case of Elevators Centrifugal pumps Colliery winders Steel rolling mills Elevators Centrifugal pumps Colliery winders Steel rolling mills ANSWER DOWNLOAD EXAMIANS APP
DC Motors The rheostatic speed control method is very Efficient Economical Suitable for getting speeds above the normal Unsuitable for rapidly changing loads Efficient Economical Suitable for getting speeds above the normal Unsuitable for rapidly changing loads ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc machines the residual magnetism is of the order of 50 to 75 percent 2 to 3 percent 20 to 25 percent 10 to 15 percent 50 to 75 percent 2 to 3 percent 20 to 25 percent 10 to 15 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors For the same H.P. rating and full load speed, following motor has poor starting torque Cumulatively compounded Series Shunt Differentially compounded Cumulatively compounded Series Shunt Differentially compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is 4.76% 8.85% 6.77% 2.22% 4.76% 8.85% 6.77% 2.22% ANSWER DOWNLOAD EXAMIANS APP
DC Motors Ward-Leonard control is basically a Field control method Field divertor method Armature resistance control method Voltage control method Field control method Field divertor method Armature resistance control method Voltage control method ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS