DC Motors For constant torque drive which speed control method is preferred? Armature voltage control Field control Shunt armature control Mechanical loading system Armature voltage control Field control Shunt armature control Mechanical loading system ANSWER DOWNLOAD EXAMIANS APP
DC Motors In variable speed motor Same commutating field is needed at low speed than at high speed A weaker commutating field is needed at low speed than at high speed None of these A stronger commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed A weaker commutating field is needed at low speed than at high speed None of these A stronger commutating field is needed at low speed than at high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc compound machine, Both play equally dominant role Either can play dominant role Series field winding plays dominant role Shunt field winding plays dominant role Both play equally dominant role Either can play dominant role Series field winding plays dominant role Shunt field winding plays dominant role 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 6.77% 2.22% 4.76% 8.85% 6.77% 2.22% 4.76% 8.85% ANSWER DOWNLOAD EXAMIANS APP
DC Motors Differentially compound D.C. motors can find applications requiring Frequent on-off cycles High starting torque Variable speed Low starting torque Frequent on-off cycles High starting torque Variable speed Low starting torque ANSWER DOWNLOAD EXAMIANS APP
DC Motors Three point starter can be used for Shunt motor only Both shunt and compound motor Compound motor only Series motor only Shunt motor only Both shunt and compound motor Compound motor only Series motor only ANSWER DOWNLOAD EXAMIANS APP
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