DC Motors Which one of the following is not the function of pole shoes in a D.C. machine? To reduce the reluctance of the magnetic path To support the field coils To reduce eddy current loss To spread out flux for better uniformity To reduce the reluctance of the magnetic path To support the field coils To reduce eddy current loss To spread out flux for better uniformity ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following can be used for controlling the speed of a dc motor? Thyratron Thyristor Thermistor Transistor Thyratron Thyristor Thermistor Transistor ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc motor if the back emf is absent Motor will not run at all Motor will burn Motor will run at very slow speed Motor will run at very high speed Motor will not run at all Motor will burn Motor will run at very slow speed Motor will run at very high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors If conditions for maximum power for a dc motor are established, the efficiency of the motor will be 60 to 70 % 80 to 90 % Less than 50% 100 % 60 to 70 % 80 to 90 % Less than 50% 100 % ANSWER DOWNLOAD EXAMIANS APP
DC Motors The direction of rotation of a D.C. series motor can be changed by None of these Either of (A) and (B) above Interchanging field terminals Interchanging supply terminals None of these Either of (A) and (B) above Interchanging field terminals Interchanging supply terminals ANSWER DOWNLOAD EXAMIANS APP
DC Motors D.C. series motors are used Where load changes frequently Where constant operating speed is needed None of these Where load is constant Where load changes frequently Where constant operating speed is needed None of these Where load is constant ANSWER DOWNLOAD EXAMIANS APP
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